133 results on '"Pineda JR"'
Search Results
2. The Power of Digital Communication in Scaling Remote Engineering Teams: An Interview-Based Study on Cultural Diversity and Challenges in Telecommuting.
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Aquino, Trishia Joyce D., Cordero, Angela Faith F., Culla, Anne Katherine C., Manliclic, Sid Nicolas J., Pineda Jr., Florentino G., and Rafael, Charlie Jay C.
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DIGITAL communications ,CULTURAL pluralism ,TELECOMMUTING ,CORPORATE culture ,WORK environment - Abstract
In this day and age, the world has slowly been shifting to the widespread use of technology in almost all aspects, including employment. This is proven by the continuous growth in the number of remote jobs globally, which allows people to work from home through the use of technology anytime and anywhere. Naturally, challenges and dilemmas, especially when it comes to communication, arise in the workplace. However, the challenges experienced in the face-to-face setup may differ from what is experienced in a remote or online setup. That being said, this research aims to discover the organizational culture being practiced in a remote work setup, specifically its organizational culture, communication flow, and practices, as well as the communication model being observed in the workplace through the conduction of an interview between two engineers. The findings reveal that the organization has both linguistic diversity and cultural pluralism. Moreover, their primary communication channels are digital tools, which is an indication that the Interactive model of communication is observed in their company. In addition, employees, irrespective of their positions, are also given the chance to participate and talk during meetings, which signifies that the company's communication flows are both vertical and horizontal. Lastly, technological barriers like internet connectivity impact project development, which may lead to miscommunications in the workplace. Overall, the research sheds light on communication challenges and practices in remote work environments while also highlighting the healthy work atmosphere the selected organization has cultivated. [ABSTRACT FROM AUTHOR]
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- 2024
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3. Examining Communication Patterns in a Construction Setting: An Interview-Based Study.
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Maria, Carlo L. Sta., Santos, Lee Andrei L., Cabrera, Andreu S., Noble, C-Jay R., and Pineda Jr., Florentino G.
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CORPORATE culture ,COMMUNICATION strategies ,COMMUNICATION barriers ,QUALITATIVE research ,JARGON (Terminology) - Abstract
The fundamental concept of this study is to explore the communication dynamics of a general contractor institution. The study examines the organizational culture and communication flow to determine the communication model employed by the institution and document its communication practices. This study employed a qualitative research approach to analyze the institution's communication dynamics in-depth. The researchers conducted an interview and documented and transcribed the responses. Thematic analysis was used to analyze the data collected from participants. The findings of this study revealed that the general contractor institution operates under a hierarchical structure but strongly emphasizes respect during interactions. Their well-organized decision-making system allows workers to raise concerns effectively. The institution adeptly uses various communication channels such as Messenger, Viber, Text Message, and Email, adapting tones to specific contexts. Challenges include industryspecific jargon, language barriers, and the influence of hierarchy on feedback dynamics. The result showed that the communication models utilized by the institution are Schramm's model and the Shannon-Weaver model, which emphasize the importance of shared meanings, standard codes, and active participation in communication. Schramm's model highlights feedback and the need for a common understanding, while the Shannon-Weaver model addresses noise reduction and the cyclical nature of communication through feedback. Overall, this study provides important insights into the communication dynamics of the general contractor institution and offers an overview of specific instances or events that have transpired within the organization. [ABSTRACT FROM AUTHOR]
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- 2024
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4. Analyzing the Effectiveness of Property Developers' In-house-Developed Versus Outsourced Systems on Procurement Efficiency
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Beloy, Julianne Cyrose D., Garcia, Shirley D., Pigao, Kevin Jamir F., Rosauro C. Pineda Jr., Beloy, Julianne Cyrose D., Garcia, Shirley D., Pigao, Kevin Jamir F., and Rosauro C. Pineda Jr.
- Abstract
Digital solutions have greatly progressed the automation of procurement functions across industries, including real estate. This study focused on analyzing the effectiveness of in-house-developed applications compared to outsourced systems on the procurement efficiency of property developers. Regardless of the company size, procurement involves several steps to obtain the goods and services needed for the business. One of the distinct functions of the procurement department is to ensure that purchased materials, or services conform to specified requirements at the most economical but good quality and in favorable terms. Streamlining systems, procedures, and processes, overcoming operational challenges, and establishing a sound business culture with well-integrated solutions are the objectives of digitization. This research study aims to ascertain the efficacy of internally developed systems versus externally obtained software for procurement efficiency of real estate developers in Makati City, Philippines, with 65 respondents. The researchers aim to examine the respondents’ perception of the perceived usefulness and perceived ease of use of in-house-developed systems compared to outsourced applications in achieving procurement efficiency with consideration of the company size and users’ age group. The researchers made use of descriptive and explanatory research methods for the investigation of the significant relationship and differences between the two digital platforms. The results of the study show several significant implications. The demographic profile of the respondents plays a relevant role in the assessment of the effectiveness of internally developed software versus outsourcing for procurement efficiency. Distinct differences were observed in terms of perceived usefulness and perceived ease of use between in-house-developed systems and outsourced systems. The findings indicate that individuals who utilize outsourced systems tend to exhibit a greater inclin
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- 2023
5. EXPLORING CULTURAL FORMATION THROUGH COMMUNICATION PRACTICES IN EDUCATIONAL INSTITUTIONS: IDENTIFYING PRACTICES, OVERCOMING BARRIERS, AND IMPLEMENTING SOLUTIONS
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Florentino G. Pineda, Jr.
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Microbiology (medical) ,Immunology ,Immunology and Allergy - Abstract
The current paper focuses on the qualitative method used that examines the cultural formation in the educational institution, its practices, barriers, and solution. The use of qualitative research in this study reveals insights into how communication becomes an integral part of the culture-shaping process through its focus on the emerging themes and patterns developed over time. Among the methods used included a collection of notes and interviews from three generational participants; and an analysis of the Focus Discussion Group (FGD). FGD were classified on the nature of their inputs as indicated in the foreshadowed problems that seek to identify the characteristics of a culture-shaping process, experiences of communicators, and challenges encountered by members of the organizations in the aspect of behavior, satisfaction, and engagement. The obtained data demonstrate that organizational culture has a significant influence on the performance of the members. Many of the responses reflect the involvement of “cultured” individual perspectives that emerged from their daily work experiences and communication practices that leads to the formation of subgroups. Furthermore, the inclusion of the management, diversity of cultural backgrounds, and expectations also emerged. Based on the findings, the identified pieces of evidence in the approaches of both the management and members towards communicated rules policy have led to the formulation of a long-term sustainable adjustment in culture formation that mainly impacts motivation, communication, improving organizational values, decision-making, and solving conflicts. Article visualizations
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- 2023
6. SPEAKING ENGLISH POLICY: IMPACT ON THE ENGLISH LANGUAGE PROFICIENCY OF THE ESL
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Franzine Leighan V. Chee, Alexis Joyce S. Cruz, Joanna Marie R. Lorenzo, Bethel Grace C. Nicodemus, and Florentino G. Pineda, Jr.
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General Medicine - Abstract
Learning English for different purposes, especially in the workplace has drastically changed. English increases the chances of getting a good job in any local or multinational company. It is also the language of communication, it is used in the media and the internet community, so learning English is important for socializing and entertainment as well as work. It is essential for individuals and future professionals to have profound knowledge and understanding of the English language that is used in any respective field. The study was conducted to weigh up the English language proficiency skills of a selected private school in the City of Malolos, particularly the grade ten (10) students who implement the English Only Policy and another secondary government school in the same city of Bulacan who do not implement the English Only Policy. The impact and factors of the English-Only Policy on students were measured and identified. The researcher utilized an English proficiency test from Cambridge University as the research instrument, which was given to the 80 respondents. The study is comparative that utilized an independent t-test in analyzing the data gathered. The results showed that there is a significant difference in the English language proficiency skills of the students who come from schools that have an English-only policy and those students who come from a school that does not implement the said policy. The research recommends that the students be more engaged and motivated to increase their English language proficiency skills. The teachers should also motivate their students to not only use the English language but also encourage them to use their L1. Article visualizations
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- 2023
7. EFFECTIVENESS OF INTERNATIONAL GRADUATE PROGRAM OF BULACAN STATE UNIVERSITY: BASIS FOR PROGRAM ENHANCEMENT
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Florentino G. Pineda, Jr.
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General Medicine - Abstract
The study dealt with the Effectiveness of International Graduate Programs at BSU as a Basis for Program Enhancement. The research aims to evaluate its purpose, and its standard as indicated by academic standards, such as standards of competence, service standards, and organizational standards. One of the primordial considerations of the Graduate School is its goal to produce balanced, competent, research-oriented, and globally competitive graduates. Thus, the researcher conceptualized the study; to accomplish the needed interactions with the officials and students of BSU – Hong Kong Lifelong Education Organization Limited; to unearth issues and modern trends, policies, and programs for BSU adoption to benefit the local students and; to initiate or trail- blazed foreign researches for the upliftment the Research and Extension Services of Department, where B.S.U. had fallen short during previous evaluation. The study used the descriptive, quantitative design using survey-questionnaire and interviews as the primary data-gathering instruments. Documented data on the demographic profile of students, number of graduates, and ranking of BSU Hong Kong were also utilized. The enrolled graduate students of BSU Hong Kong, faculty, and administrators of BSU Hong Kong were the respondents of the study. Article visualizations
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- 2023
8. SITUATIONAL FACTORS: BASES FOR IMPROVING THE ATTITUDE AND MOTIVATION OF ESL LEARNERS’ SPEAKING SKILLS IN THE COLLEGE OF ARTS AND LETTERS
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Florentino G. Pineda, Jr. and Issachar A. Dela Cerna
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General Medicine - Abstract
This paper highlights the importance of enhancing the speaking skills among ESL freshmen in the College of Arts and Letters of Bulacan State University. The respondents in this study were Bachelor of Arts in Mass Communication Major in Broadcasting Sections A to D. Although this course requires oral communication proficiency for global competitiveness, only a few students participate actively in classroom discussions. Many of them lag behind in terms of speaking skills. The ability to speak English has become the norm in the country and around the world. Graduates who possess such a skill can have better opportunities locally or internationally compared with those who cannot speak fluently. Hence, the researchers looked into the role of attitude and motivation in enhancing speaking skills among the respondents in terms of the following: demographics, the attitude of students toward English, situational factors affecting the attitude of students toward English, the motivation of students in learning English, and students’ beliefs about learning English. The research instrument was administered to the respondents via Google Forms. The 32-item questionnaire was designed to determine the attitudes and motivation of ESL students toward learning English. Each of the respondents was scored from 1-5 on a Likert Scale. Through the use of the Pearson Correlation Coefficient, Fisher Z-test, and P-Value in testing the hypotheses, data were analyzed and interpreted. The Likert Scales show the participants had an incredibly positive attitude and behavior toward English in general. Among all motivation items, the top factors affecting students to learn more in English are the Student’s Practical Purpose, Correction of the Teacher during Class, Communication Focused Class Activities, and Positive Atmosphere during class. Based on the findings of the study, language teachers should take advantage of motivation to foster a positive attitude among the students when it comes to speaking skills through the use of authentic materials such as audio, video, printed, and softcopies. Factors such as activities, environment, and teachers’ attitudes should be the point of reference in determining which learning materials work best in enhancing the speaking skills of the students. Article visualizations
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- 2023
9. CHICANX UTOPIAS: POP CULTURE AND THE POLITICS OF THE POSSIBLE.
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Pineda Jr., Ramon
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POPULAR culture , *POLITICS & culture , *SOLIDARITY , *NATIVE Americans , *UTOPIAS , *DEHUMANIZATION ,RACE relations in the United States - Published
- 2023
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10. The addition of intravenous, high dose, bolus of methyl-prednisolone increases the early clinical response to oral corticosteroids in moderately active ulcerative colitis. Preliminary results of a prospective, controlled, multicentre, randomised, open-label study
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Moral, ED, Llao, J, Manosa, M, Martin-Arranz, E, Zabana, Y, Navarro-Llavat, M, Garcia-Planella, E, Busquets, D, Pineda, JR, Monfort, D, Gutierrez, A, Garcia-Alonso, FJ, Menchen, LA, and Villoria, A
- Published
- 2022
11. DISSONANT DEEJAYS OF CUMBIA SONIDERO: Cultivating Queer Vibes and Mujerista Mentorship.
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Pineda Jr., Ramon
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DISC jockeys ,MENTORING ,HETERONORMATIVITY ,SEXUAL minority women ,SELF-efficacy ,FEMINISTS ,CAPITALISM ,PARTICIPANT observation ,WOMEN of color ,WOMEN'S empowerment ,PATRIARCHY - Abstract
Informed by a soniderx methodology, I conducted participant observation and pláticas with ten womxn or queer deejays to theorize their soniderx practices. I built upon Deborah Vargas’s use of “dissonance,” an interruption or disruption to “heteronormative and cultural nationalist limits of Borderlands subjectivities and cultural histories” to characterize the work of these soniderxs. Dissonance— rather than the oft-used analytic of “resistance”—allows me to break from a dialectical opposition to oppressive systems of empire (heteronormativity, patriarchy, capitalism, etc.) and ‘aquí/allá subjectivities.’ Additionally, I employ José Esteban Muñoz’s concept of queer utopia to ground the term “vibe” as an analytic to describe the sonic futurity these deejays cultivate during their performances. Fueled by feminista empowerment and convivencia, vibe is produced by queer women of color and gender non-conforming deejays commanding turntables, creating ecstatic moments that constitute a potentiality and a horizon of possibility (Muñoz 2009). Grounded in the Afro-diasporic genres cumbia and reggaetón, the vibe generated by soniderxs signals possibility and futurity to envision a world that centers and connects non-normative identities and cultures. [ABSTRACT FROM AUTHOR]
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- 2022
12. ACCEPTABILITY OF E-COURSEWARE IN THE TEACHING OF ARTS: INPUTS TO ACTION PLAN TOWARDS DEPED’S COMPUTERIZATION PROGRAM
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Adulfo S. Amit, Reynaldo S. Pineda Jr, Adulfo S. Amit, and Reynaldo S. Pineda Jr
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This study aimed to determine the Acceptability of e-Courseware in the Teaching of Arts: Inputs to Action Plan Towards DepEd’s Computerization in the Division of City Schools, Manila, that will provide teachers and learners with the 21st century skills which involve the Technological Pedagogical Content Knowledge (TPACK) framework attuned to the needs of the learners. The respondents of the study were selected Grade 3 teachers from Districts I – VI in the Division of City Schools, Manila. This study employed the quantitative descriptive method of research. Frequency and percentage, Weighted Mean and Test of Difference were used to answer the problem of the study. Based on the findings of the study, the respondents rated all the five indicators; content, pedagogy, usability, adaptability, design and layout as “Highly Acceptable”. In the light of the significant findings and conclusions of the study, the following recommendations are hereby offered: 1.) It is highly recommended that the eCourseware should be adopted by the Department of Education and utilized this Learning Management System (LMS) toward teaching arts subject among grade 3 learners in the country during and after pandemic time. 2.) A mixed-method design of research through focus group discussion including the stakeholders like administrators, parents and education technology specialists/experts can be conducted by future researcher/s towards enhancement of the e-Courseware material. 3.) Further validation, evaluation and enhancement of the eCourseware must be done in order to come up with exemplary, efficiency standards for learning and teaching art lessons. 4.) Valid and reliable technological, pedagogical, content knowledge research tool that can be used by the future researcher/s in assessing and modifying the content, pedagogy, usability, adaptability, layout and design. 5.) Create another version of eCourseware which can give more features to enhance the interest of the learners. 6.) Create an Act
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- 2021
13. shinyCurves, a shiny web application to analyse multisource qPCR amplification data: a COVID 19 case study
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Olaechea-Lázaro, S., primary, García-Santisteban, I., additional, Pineda, JR., additional, Badiola, I., additional, Alonso, S., additional, Bilbao, JR., additional, and Fernandez-Jimenez, N., additional
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- 2020
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14. MULTICENTER PROSPECTIVE RANDOMIZED STUDY TO COMPARE ENDOSCOPIC TREATMENT OF STRICTURES IN CROHN´S DISEASE (CD): SELF-EXPANDING METAL STENTS (SEMS) VS ENDOSCOPIC BALLOON DILATION (EBD). PROTDILAT STUDY
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Andújar, X, additional, Loras, C, additional, Gornals, JB, additional, Guardiola, J, additional, Sanchiz, V, additional, Bosca, M, additional, Brullet, E, additional, Sicilia, B, additional, Naranjo, A, additional, Dueñas, C, additional, Foruny, JR, additional, Busquets, D, additional, Monfort, D, additional, Martín-Arranz, MD, additional, Barrio, J, additional, Pineda, JR, additional, González-Huix, F, additional, Pérez-Roldán, F, additional, Pons, V, additional, González, B, additional, Sainz, E, additional, Reyes-Moreno, J, additional, Fernández-Bañares, F, additional, and Esteve, M, additional
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- 2020
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15. Human Dental Pulp Stem Cells Grown in Neurogenic Media Differentiate into Endothelial Cells and Promote Neovasculogenesis in the Mouse Brain
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Luzuriaga, J., primary, Pastor-Alonso, O., additional, Encinas, J.M., additional, Unda, F., additional, Ibarretxe, G., additional, and Pineda, JR., additional
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- 2018
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16. Evolution After Anti-TNF Discontinuation in Patients With Inflammatory Bowel Disease: A Multicenter Long-Term Follow-Up Study
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Casanova MJ, Chaparro M, García-Sánchez V, Nantes O, Leo E, Rojas-Feria M, Jauregui-Amezaga A, García-López S, Huguet JM, Arguelles-Arias F, Aicart M, Marín-Jiménez I, Gómez-García M, Muñoz F, Esteve M, Bujanda L, Cortés X, Tosca J, Pineda JR, Mañosa M, Llaó J, Guardiola J, Pérez-Martínez I, Muñoz C, González-Lama Y, Hinojosa J, Vázquez JM, Martinez-Montiel MP, Rodríguez GE, Pajares R, García-Sepulcre MF, Hernández-Martínez A, Pérez-Calle JL, Beltrán B, Busquets D, Ramos L, Bermejo F, Barrio J, Barreiro-de Acosta M, Roncedo O, Calvet X, Hervías D, Gomollón F, Domínguez-Antonaya M, Alcaín G, Sicilia B, Dueñas C, Gutiérrez A, Lorente-Poyatos R, Domínguez M, Khorrami S, Taxonera C, Rodríguez-Pérez A, Ponferrada A, Van Domselaar M, Arias-Rivera ML, Merino O, Castro E, Marrero JM, Martín-Arranz M, Botella B, Fernández-Salazar L, Monfort D, Opio V, García-Herola A, Menacho M, Ramírez-de la Piscina P, Ceballos D, Almela P, Navarro-Llavat M, Robles-Alonso V, Vega-López AB, Moraleja I, Novella MT, Castaño-Milla C, Sánchez-Torres A, Benítez JM, Rodríguez C, Castro L, Garrido E, Domènech E, García-Planella E, and Gisbert JP
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Male ,Constriction, Pathologic ,Inflammatory bowel disease ,Gastroenterology ,Deprescriptions ,0302 clinical medicine ,Crohn Disease ,Recurrence ,Risk Factors ,Medicine ,Young adult ,Mesalamine ,Aged, 80 and over ,Incidence ,Incidence (epidemiology) ,Remission Induction ,Age Factors ,Middle Aged ,Antirheumatic Agents ,030220 oncology & carcinogenesis ,Retreatment ,Disease Progression ,Female ,030211 gastroenterology & hepatology ,Tumor necrosis factor alpha ,Adult ,medicine.medical_specialty ,Adolescent ,Drug-Related Side Effects and Adverse Reactions ,Colon ,Young Adult ,03 medical and health sciences ,Ileum ,Internal medicine ,Humans ,Immunologic Factors ,Colitis ,Aged ,Proportional Hazards Models ,Retrospective Studies ,Hepatology ,Tumor Necrosis Factor-alpha ,business.industry ,Proportional hazards model ,Adalimumab ,Retrospective cohort study ,Protective Factors ,Inflammatory Bowel Diseases ,medicine.disease ,Infliximab ,Discontinuation ,Methotrexate ,Colitis, Ulcerative ,business ,Follow-Up Studies - Abstract
OBJECTIVES: The aims of this study were to assess the risk of relapse after discontinuation of anti-tumor necrosis factor (anti-TNF) drugs in patients with inflammatory bowel disease (IBD), to identify the factors associated with relapse, and to evaluate the overcome after retreatment with the same anti-TNF in those who relapsed. METHODS: This was a retrospective, observational, multicenter study. IBD patients who had been treated with anti-TNFs and in whom these drugs were discontinued after clinical remission was achieved were included. RESULTS: A total of 1,055 patients were included. The incidence rate of relapse was 19% and 17% per patient-year in Crohn's disease and ulcerative colitis patients, respectively. In both Crohn's disease and ulcerative colitis patients in deep remission, the incidence rate of relapse was 19% per patient-year. The treatment with adalimumab vs. infliximab (hazard ratio (HR)=1.29; 95% confi dence interval (CI)= 1.01-1.66), elective discontinuation of anti-TNFs (HR=1.90; 95% CI= 1.07-3.37) or discontinuation because of adverse events (HR= 2.33; 95% CI= 1.27-2.02) vs. a top-down strategy, colonic localization (HR= 1.51; 95% CI= 1.13-2.02) vs. ileal, and stricturing behavior (HR= 1.5; 95% CI= 1.09-2.05) vs. inflammatory were associated with a higher risk of relapse in Crohn's disease patients, whereas treatment with immunomodulators after discontinuation (HR= 0.67; 95% CI= 0.51-0.87) and age (HR= 0.98; 95% CI= 0.97-0.99) were protective factors. None of the factors were predictive in ulcerative colitis patients. Retreatment of relapse with the same anti-TNF was effective (80% responded) and safe. CONCLUSIONS: The incidence rate of infl ammatory bowel disease relapse after anti-TNF discontinuation is relevant. Some predictive factors of relapse after anti-TNF withdrawal have been identifi ed. Retreatment with the same anti-TNF drug was effective and safe.
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- 2017
17. Cuerpos extraños esofágicos: Nuestra experiencia en un hospital terciario
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García De La Rosa, Y, additional, Estévez Boullosa, P, additional, Martínez, A, additional, Domínguez, F, additional, Pineda, JR, additional, Hernández, V, additional, Cadilla, J, additional, Vázquez, S, additional, Pereira, S, additional, and Rodríguez-Prada, I, additional
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- 2017
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18. Síndrome de “Buried bumper”: prevalencia, presentación y pronóstico de esta complicación endoscópica
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García De La Rosa, YP, additional, De Castro Parga, L, additional, Pineda, JR, additional, Domínguez, F, additional, Cid, L, additional, Estévez, P, additional, Rincón, A, additional, Romero, B, additional, Quintans, N, additional, and Rodríguez-Prada, I, additional
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- 2017
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19. Modelo Analítico del Vuelo de Dispersión del Aquenio de Triplaris Caracasana Cham
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Ladera, Celso L., Pineda Jr, Pedro A., Alcalá, Gustavo, Ladera, Celso L., Pineda Jr, Pedro A., and Alcalá, Gustavo
- Abstract
Se presenta un modelo físico del movimiento vertical de dispersión de los aquenios (frutos alados) de Triplaris caracasana Cham, especie de árbol autóctono de la región Norte de Venezuela, y que crece en selvas tropicales de vientos alisios. Hemos encontrado que estos aquenios inician su “vuelo” de dispersión con un régimen transitorio no-lineal de rotación y traslación simultáneas, que luego es seguido por un régimen terminal. Nuestro modelo teórico del aquenio proporciona dos ecuaciones diferenciales no-lineales que representan con buena exactitud ambos regímenes de rotación y traslación de un espécimen real. Basado en formalismos de mecánica analítica, el modelo predice un descenso inicial con una rapidez que tiene dependencia temporal tangente-hiperbólica, y luego el régimen terminal con rapidez de traslación vertical y rapidez angular de rotación constantes. Los resultados experimentales, obtenidos mediante localización ultrasónica y estroboscopía electrónica, confirman la validez de nuestro modelo. En el régimen uniforme la rapidez de descenso alcanza entre 0,9 y 1,2 m/s, mientras que la rapidez angular alcanza un valor entre 95 y 125 rad/s. Esta sucesión de regímenes cinemáticos, no-lineal y lineal, para traslación y rotación, y los torques que actúan sobre el aquenio, permiten a Triplaris maximizar su proceso de dispersión
- Published
- 2009
20. Clean recovery of flavonoids from citrus peel: studying lipid-flavonoid interactions as a tool for understanding the antioxidant activity
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Londoño, J, primary, Creczynski-Pasa, TB, additional, de Lima, VR, additional, Silva, MAS, additional, Murakami, FS, additional, Jaramillo, C, additional, and Ramirez-Pineda, JR, additional
- Published
- 2008
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21. Superluminal and subluminal propagation dependence upon the time constants of the lower levels and the Rabi frequency in EIT.
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Pineda Jr., Pedro A. and Ladera, Celso L.
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- 2004
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22. Fully quantized model of coherent trapping
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Pineda, Jr., Pedro A., primary and Ladera, Celso L., additional
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- 2001
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23. Organization of the gene for an invertebrate mitochondrial creatine kinase: comparisons with genes of higher forms and correlation of exon boundaries with functional domains
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Pineda Jr., Agustin O, primary and Ellington, W.Ross, additional
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- 2001
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24. Fully quantized model of coherent trapping.
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Pineda Jr., Pedro A. and Ladera, Celso L.
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- 2001
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25. Structural and functional implications of the amino acid sequences of dimeric, cytoplasmic and octameric mitochondrial creatine kinases from a protostome invertebrate.
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Pineda Jr., Agustin O. and Ellington, W. Ross
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CHAETOPTERUS , *CREATININE - Abstract
Studies the cDNA and deduced amino acid sequences of dimeric and octameric creatinine kinase (CK) from Chaetopterus variopedatus. Evolutionary pathway for CK; CK isoenzymes contained in Chaetopterus; Structure/function relationships of residues.
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- 1999
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26. HB-EGF activates EGFR to induce reactive neural stem cells in the mouse hippocampus after seizures.
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Pastor-Alonso O, Durá I, Bernardo-Castro S, Varea E, Muro-García T, Martín-Suárez S, Encinas-Pérez JM, and Pineda JR
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- Animals, Mice, Male, Disease Models, Animal, Gefitinib pharmacology, Epilepsy, Temporal Lobe metabolism, Cell Differentiation drug effects, Kainic Acid pharmacology, Mice, Inbred C57BL, ErbB Receptors metabolism, Neural Stem Cells metabolism, Neural Stem Cells drug effects, Hippocampus metabolism, Heparin-binding EGF-like Growth Factor metabolism, Seizures metabolism, Neurogenesis drug effects, Signal Transduction drug effects
- Abstract
Hippocampal seizures mimicking mesial temporal lobe epilepsy cause a profound disruption of the adult neurogenic niche in mice. Seizures provoke neural stem cells to switch to a reactive phenotype (reactive neural stem cells, React-NSCs) characterized by multibranched hypertrophic morphology, massive activation to enter mitosis, symmetric division, and final differentiation into reactive astrocytes. As a result, neurogenesis is chronically impaired. Here, using a mouse model of mesial temporal lobe epilepsy, we show that the epidermal growth factor receptor (EGFR) signaling pathway is key for the induction of React-NSCs and that its inhibition exerts a beneficial effect on the neurogenic niche. We show that during the initial days after the induction of seizures by a single intrahippocampal injection of kainic acid, a strong release of zinc and heparin-binding epidermal growth factor, both activators of the EGFR signaling pathway in neural stem cells, is produced. Administration of the EGFR inhibitor gefitinib, a chemotherapeutic in clinical phase IV, prevents the induction of React-NSCs and preserves neurogenesis., (© 2024 Pastor-Alonso et al.)
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- 2024
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27. Editorial: Tumor accommodation: the importance of the niche in neurological tumors.
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Azzarelli R, Gauthier LR, Pineda JR, and Marques-Torrejon MA
- Abstract
Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. The author(s) declared that they were an editorial board member of Frontiers, at the time of submission. This had no impact on the peer review process and the final decision.
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- 2024
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28. Clinical and treatment outcomes of a second subcutaneous or intravenous anti-TNF in patients with ulcerative colitis treated with two consecutive anti-TNF agents: data from the ENEIDA registry.
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Calafat M, Torres P, Tosca-Cuquerella J, Sánchez-Aldehuelo R, Rivero M, Iborra M, González-Vivo M, Vera I, de Castro L, Bujanda L, Barreiro-de Acosta M, González-Muñoza C, Calvet X, Benítez JM, Llorente-Barrio M, Surís G, Cañete F, Arias-García L, Monfort D, Castaño-García A, Garcia-Alonso FJ, Huguet JM, Marín-Jímenez I, Lorente R, Martín-Cardona A, Ferrer JÁ, Camo P, Gisbert JP, Pajares R, Gomollón F, Castro-Poceiro J, Morales-Alvarado J, Llaó J, Rodríguez A, Rodríguez C, Pérez-Galindo P, Navarro M, Jiménez-García N, Carrillo-Palau M, Blázquez-Gómez I, Sesé E, Almela P, Ramírez de la Piscina P, Taxonera C, Rodríguez-Lago I, Cabrinety L, Vela M, Mínguez M, Mesonero F, García MJ, Aguas M, Márquez L, Silva Porto M, Pineda JR, García-Etxebarría K, Bertoletti F, Brunet E, Mañosa M, and Domènech E
- Abstract
Background: Infliximab seems to be the most efficacious of the three available anti-TNF agents for ulcerative colitis (UC) but little is known when it is used as the second anti-TNF., Objectives: To compare the clinical and treatment outcomes of a second subcutaneous or intravenous anti-TNF in UC patients., Design: Retrospective observational study., Methods: Patients from the ENEIDA registry treated consecutively with infliximab and a subcutaneous anti-TNF (or vice versa), naïve to other biological agents, were identified and grouped according to the administration route of the first anti-TNF into IVi (intravenous initially) or SCi (subcutaneous initially)., Results: Overall, 473 UC patients were included (330 IVi and 143 SCi). Clinical response at week 14 was 42.7% and 48.3% in the IVi and SCi groups (non-statistically significant), respectively. Clinical remission rates at week 52 were 32.8% and 31.4% in the IVi and SCi groups (nonsignificant differences), respectively. A propensity-matched score analysis showed a higher clinical response rate at week 14 in the SCi group and higher treatment persistence in the IVi group. Regarding long-term outcomes, dose escalation and discontinuation due to the primary failure of the first anti-TNF and more severe disease activity at the beginning of the second anti-TNF were inversely associated with clinical remission., Conclusion: The use of a second anti-TNF for UC seems to be reasonable in terms of efficacy, although it is particularly reduced in the case of the primary failure of the first anti-TNF. Whether the second anti-TNF is infliximab or subcutaneous does not seem to affect efficacy., Competing Interests: MC has served as a speaker for Takeda, Janssen, Faes Farma, and MSD; FC has served as a speaker or has received educational grants from Takeda, Janssen, MSD, and Ferring; MR has served as a speaker or has received research or educational funding or advisory fees from MSD, Abbvie, Pfizer, Takeda, and Janssen; MI has served as a speaker or has received research or educational funding or advisory fees from MSD, Janssen, Adacyte, and Takeda; LC has served as a speaker or has received research or educational funding or advisory fees from Abbvie, Dr. Falk Pharma, and Tillots Pharma; LB has served as a speaker or has received research or educational funding or advisory fees from Ikan Biotech; MBA has served as a speaker or has received research or educational funding or advisory fees from MSD, AbbVie, Janssen, Kern Pharma, Celltrion, Takeda, Gillead, Celgene, Pfizer, Sandoz, Biogen, Fresenius, Ferring, Faes Farma, Dr. Falk Pharma, Chiesi, Gebro Pharma, Adacyte, and Vifor Pharma; CG-M has received educational funding fees from AbbVie, Janssen, Pfizer, Ferring, Kern Pharma, Norgine, and Tillots Pharma; JMH has served as a speaker or has received research or educational funding or advisory fees from Merck Sharp & Dohme, Ferring, Abbvie, Janssen, Biogen, Sandoz, Kern Pharma, Faes Farma, Vifor Pharma, and Takeda; RL has served as a speaker or has received research or educational funding or advisory fees from MSD, Abbvie, Pfizer, Takeda, Janssen, and Dr. Falk; AM-C has received research or educational funding from Abbvie, Biogen, Ferring, Janssen, MSD, Takeda, Dr. Falk Pharma, and Tillotts; JPG has served as a speaker or has received research or educational funding or advisory fees from MSD, Abbvie, Pfizer, Kern Pharma, Biogen, Mylan, Takeda, Janssen, Roche, Sandoz, Celgene/Bristol Myers, Gilead/Galapagos, Lilly, Ferring, Faes Farma, Shire Pharmaceuticals, Dr. Falk Pharma, Tillotts Pharma, Chiesi, Casen Fleet, Gebro Pharma, Otsuka Pharmaceutical, Norgine, and Vifor Pharma; FG has served as a speaker or has received research or educational funding or advisory fees from Faes-Farma, Galápagos, Takeda, Pfizer, Janssen, and Abbvie; PA has served as a speaker or has received research or educational funding or advisory fees from MSD, Abbvie, Takeda, Janssen, Gebro Pharma, Tillotts Pharma, and Biogen; CT has served as a speaker or has received research or educational funding or advisory fees from MSD, AbbVie, Pfizer, Takeda, Janssen, Ferring, Faes Farma, Shire Pharmaceuticals, Dr. Falk Pharma, Galapagos, and Tillots; IR-L has served as a speaker or has received research or educational funding or advisory fees from MSD, Pfizer, Abbvie, Takeda, Janssen, Tillotts Pharma, Kern, Celltrion, Roche, Ferring, Dr. Falk Pharma, Galapagos, Otsuka Pharmaceutical, and Adacyte; MM has served as a speaker and has received research or educational funding from MSD, AbbVie, Takeda, Janssen, Ferring, and Pfizer; ED has served as a speaker or has received research or educational funding or advisory fees from AbbVie, Adacyte Therapeutics, Biogen, Celltrion, Galapagos, Gilead, Janssen, Kern Pharma, MSD, Pfizer, Roche, Samsung, Takeda, and Tillots; MJG has served as a speaker or has received research or educational funding or advisory fees from Janssen, Pfizer, Abbvie, Takeda, Kern Pharma, and Ferring; MA has served as a speaker or has received research or educational funding or advisory fees from Faes, Ferring, and Janssen, and received educational grants from Janssen; JRP has served as a speaker or has received research or educational funding or advisory fees from MSD, AbbVie, and Tillots Pharma; FB received educational funding fees from AbbVie, Janssen, Pfizer, Ferring, Kern Pharma, Norgine, and Tillots Pharma. The remaining authors declared no conflicts of interest., (© The Author(s), 2024.)
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- 2024
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29. Intracranial graft of bioresorbable polymer scaffolds loaded with human Dental Pulp Stem Cells in stab wound murine injury model.
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Manero-Roig I, Polo Y, Pardo-Rodríguez B, Luzuriaga J, Basanta-Torres R, Martín-Aragón D, Romayor I, Martín-Colomo S, Márquez J, Gomez-Santos L, Lanore F, Humeau Y, Ibarretxe G, Eguizabal C, Larrañaga A, and Pineda JR
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- Animals, Humans, Mice, Stem Cell Transplantation methods, Wounds, Stab therapy, Absorbable Implants, Brain Injuries therapy, Brain Injuries pathology, Tissue Engineering methods, Dental Pulp cytology, Tissue Scaffolds chemistry, Stem Cells cytology, Disease Models, Animal, Mice, Nude
- Abstract
The prevalence of central nervous system (CNS) dysfunction as a result of disease or trauma remains a clinically unsolved problem which is raising increased awareness in our aging society. Human Dental Pulp Stem Cells (hDPSCs) are excellent candidates to be used in tissue engineering and regenerative therapies of the CNS due to their neural differentiation ability and lack of tumorigenicity. Accordingly, they have been successfully used in animal models of spinal cord injury, stroke and peripheral neuropathies. The ideal therapy in brain injury should combine strategies aiming to protect the damaged lesion and, at the same time, accelerate brain tissue regeneration, thus promoting fast recovery while minimizing side or long-term effects. The use of bioresorbable nanopatterned poly(lactide-co-ɛ-caprolactone) (PLCL) polymeric scaffolds as hDPCSs carriers can represent an advantage for tissue regeneration. In this chapter, we describe the surgical procedures to implant functionalized bioresorbable scaffolds loaded with hDPSCs to improve the brain lesion microenvironment in an intracranial stab wound injury model severing the rostral migratory stream (RMS) that connects the brain subventricular zone (SVZ) and the olfactory bulb in nude mice. Additionally, we also describe the technical steps after animal sacrifice for histological tissue observation and characterization., Competing Interests: Disclosures I.M.R., Y.P., B.P.R., J.L., R.B.T., D.M.A., I.R., S.M.C., J.M., L.G.S., G.I., F.L., Y.H., C.E., A.L., J.R.P. have no conflict of interest to disclose., (Copyright © 2024 Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies.)
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- 2024
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30. Hospital Outcomes of Spontaneous Coronary Artery Dissection With Concurrent Ventricular Arrhythmias.
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Tan MC, Yeo YH, Ang QX, Lee JZ, Yang EH, Mazzarelli JK, Pineda JE, Su W, and Lee KS
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Background: While patients with spontaneous coronary artery dissection (SCAD) occasionally present with concurrent ventricular arrhythmias (VA), the impact of VA on in-hospital outcomes in the United States (US) is not well-established. This study aims to analyze in-hospital outcomes of patients with SCAD and concurrent VA and to determine the factors associated with VA occurrence in this high-risk population in the US., Methods: Using the Nationwide Readmissions Database, our study included patients age 18 years or older who had SCAD between 2017 and 2020. We categorized the cohort into 2 groups depending on the presence of VA during hospitalization. In-hospital outcomes were assessed between SCAD patients with VA and those without. Weighted analysis was performed. We analyzed the independent factors associated with VA occurring among SCAD patients through univariable and multivariable analyses., Results: Eight hundred seventy-seven SCAD patients were included in the study: 118 (13.5%) with VA and 759 (86.6%) without. SCAD patients with concurrent VA were associated with higher rates of early mortality (10.2% vs 2.0%; P < .01), prolonged index hospital stay (≥7 days) (33.1% vs 11.7%; P < .01), and non-home discharge (21.2% vs 5.9%; P < .01). The length of hospital stay was longer in the SCAD with concurrent VA group (7.39 days vs 3.58 days; P < .01), and the median cumulative cost of hospitalization was also higher in this group ($31,451 vs $13,802; P < .01). SCAD patients with concurrent VA had increased in-hospital adverse events: acute heart failure, cardiac arrest, cardiogenic shock, cerebral infarction, pulmonary edema, and acute kidney injury. In multivariable analysis, the independent factors associated with VA occurrence among SCAD patients were chronic liver disease (aOR, 3.42; 95% CI, 1.43-8.20; P < .01) and heart failure (aOR, 5.63; 95% CI, 3.36-9.42; P < .01)., Conclusions: Concurrence of VA among SCAD patients was associated with poorer in-hospital outcomes. Heart failure and chronic liver disease were the independent factors associated with VA occurrence in SCAD patients., (© 2023 The Author(s).)
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- 2023
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31. Notch and Wnt Signaling Modulation to Enhance DPSC Stemness and Therapeutic Potential.
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Uribe-Etxebarria V, Pineda JR, García-Gallastegi P, Agliano A, Unda F, and Ibarretxe G
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- Humans, Cell Differentiation physiology, Cells, Cultured, Epigenesis, Genetic, Dental Pulp, Wnt Signaling Pathway, Pluripotent Stem Cells metabolism
- Abstract
The Dental Pulp of permanent human teeth is home to stem cells with remarkable multilineage differentiation ability: human Dental Pulp Stem Cells (DPSCs). These cells display a very notorious expression of pluripotency core factors, and the ability to give rise to mature cell lineages belonging to the three embryonic layers. For these reasons, several researchers in the field have long considered human DPSCs as pluripotent-like cells. Notably, some signaling pathways such as Notch and Wnt contribute to maintaining the stemness of these cells through a complex network involving metabolic and epigenetic regulatory mechanisms. The use of recombinant proteins and selective pharmacological modulators of Notch and Wnt pathways, together with serum-free media and appropriate scaffolds that allow the maintenance of the non-differentiated state of hDPSC cultures could be an interesting approach to optimize the potency of these stem cells, without a need for genetic modification. In this review, we describe and integrate findings that shed light on the mechanisms responsible for stemness maintenance of hDPSCs, and how these are regulated by Notch/Wnt activation, drawing some interesting parallelisms with pluripotent stem cells. We summarize previous work on the stem cell field that includes interactions between epigenetics, metabolic regulations, and pluripotency core factor expression in hDPSCs and other stem cell types.
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- 2023
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32. Self-assembled three-dimensional hydrogels based on graphene derivatives and cerium oxide nanoparticles: scaffolds for co-culture of oligodendrocytes and neurons derived from neural stem cells.
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Polo Y, Luzuriaga J, Gonzalez de Langarica S, Pardo-Rodríguez B, Martínez-Tong DE, Tapeinos C, Manero-Roig I, Marin E, Muñoz-Ugartemendia J, Ciofani G, Ibarretxe G, Unda F, Sarasua JR, Pineda JR, and Larrañaga A
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- Coculture Techniques, Hydrogels metabolism, Prospective Studies, Neurons, Cell Differentiation, Oligodendroglia, Tissue Scaffolds chemistry, Graphite chemistry, Neural Stem Cells, Nanoparticles
- Abstract
Stem cell-based therapies have shown promising results for the regeneration of the nervous system. However, the survival and integration of the stem cells in the neural circuitry is suboptimal and might compromise the therapeutic outcomes of this approach. The development of functional scaffolds capable of actively interacting with stem cells may overcome the current limitations of stem cell-based therapies. In this study, three-dimensional hydrogels based on graphene derivatives and cerium oxide (CeO
2 ) nanoparticles are presented as prospective supports allowing neural stem cell adhesion, migration and differentiation. The morphological, mechanical and electrical properties of the resulting hydrogels can be finely tuned by controlling several parameters of the self-assembly of graphene oxide sheets, namely the amount of incorporated reducing agent (ascorbic acid) and CeO2 nanoparticles. The intrinsic properties of the hydrogels, as well as the presence of CeO2 nanoparticles, clearly influence the cell fate. Thus, stiffer adhesion substrates promote differentiation to glial cell lineages, while softer substrates enhance mature neuronal differentiation. Remarkably, CeO2 nanoparticle-containing hydrogels support the differentiation of neural stem cells to neuronal, astroglial and oligodendroglial lineage cells, promoting the in vitro generation of nerve tissue grafts that might be employed in neuroregenerative cell therapies.- Published
- 2023
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33. Editorial: Tumor microenvironment in primary brain cancers.
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Niechi I and Pineda JR
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Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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- 2023
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34. Semisynthetic Abietic and Dehydroabietic Acid Derivatives and Triptoquinone Epimers Interfere with LPS-Triggered Activation of Dendritic Cells.
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Sierra JA, Gilchrist K, Tabares-Guevara JH, Betancur-Galvis L, Ramirez-Pineda JR, and González-Cardenete MA
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- Anti-Inflammatory Agents metabolism, Anti-Inflammatory Agents pharmacology, Cytokines metabolism, Dendritic Cells, Esters pharmacology, Interleukin-12 metabolism, Interleukin-6 metabolism, Lipopolysaccharides metabolism, Lipopolysaccharides pharmacology, Abietanes metabolism, Abietanes pharmacology, Tumor Necrosis Factor-alpha metabolism
- Abstract
Abietic acid (AA), dehydroabietic acid (DHA) and triptoquinones (TQs) are bioactive abietane-type diterpenoids, which are present in many edible vegetables and medicinal herbs with health-promoting properties. Evidence suggests that beneficial effects of diterpenes operate, at least in part, through effects on cells in the immune system. Dendritic cells (DCs) are a key type of leukocyte involved in the initiation and regulation of the immune/inflammatory response and natural or synthetic compounds that modulate DC functions could be potential anti-inflammatory/immunomodulatory agents. Herein, we report the screening of 23 known semisynthetic AA and DHA derivatives, and TQs, synthesized previously by us, in a multi-analyte DC-based assay that detects inhibition of pro-inflammatory cytokine production. Based on the magnitude of the inhibitory effect observed and the number of cytokines inhibited, a variety of activities among compounds were observed, ranging from inactive/weak to very potent inhibitors. Structurally, either alcohol or methyl ester substituents on ring A along with the introduction of aromaticity and oxidation in ring C in the abietane skeleton were found in compounds with higher inhibitory properties. Two DHA derivatives and two TQs exhibited a significant inhibition in all pro-inflammatory cytokines tested and were further investigated. The results confirmed their ability to inhibit, dose dependently, LPS-stimulated expression of the co-stimulatory molecules CD40 and/or CD86 and the production of the pro-inflammatory cytokines IL-1β, IL-6, IL-12 and TNFα. Our results demonstrate that DC maturation process can be targeted by semisynthetic DHA derivatives and TQ epimers and indicate the potential of these compounds as optimizable anti-inflammatory/immunomodulatory agents.
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- 2022
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35. Baricitinib versus dexamethasone for adults hospitalised with COVID-19 (ACTT-4): a randomised, double-blind, double placebo-controlled trial.
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Wolfe CR, Tomashek KM, Patterson TF, Gomez CA, Marconi VC, Jain MK, Yang OO, Paules CI, Palacios GMR, Grossberg R, Harkins MS, Mularski RA, Erdmann N, Sandkovsky U, Almasri E, Pineda JR, Dretler AW, de Castilla DL, Branche AR, Park PK, Mehta AK, Short WR, McLellan SLF, Kline S, Iovine NM, El Sahly HM, Doernberg SB, Oh MD, Huprikar N, Hohmann E, Kelley CF, Holodniy M, Kim ES, Sweeney DA, Finberg RW, Grimes KA, Maves RC, Ko ER, Engemann JJ, Taylor BS, Ponce PO, Larson L, Melendez DP, Seibert AM, Rouphael NG, Strebe J, Clark JL, Julian KG, de Leon AP, Cardoso A, de Bono S, Atmar RL, Ganesan A, Ferreira JL, Green M, Makowski M, Bonnett T, Beresnev T, Ghazaryan V, Dempsey W, Nayak SU, Dodd LE, Beigel JH, and Kalil AC
- Subjects
- Adolescent, Adult, Azetidines, Dexamethasone, Double-Blind Method, Female, Humans, Male, Middle Aged, Oxygen, Purines, Pyrazoles, SARS-CoV-2, Sulfonamides, Treatment Outcome, COVID-19 Drug Treatment
- Abstract
Background: Baricitinib and dexamethasone have randomised trials supporting their use for the treatment of patients with COVID-19. We assessed the combination of baricitinib plus remdesivir versus dexamethasone plus remdesivir in preventing progression to mechanical ventilation or death in hospitalised patients with COVID-19., Methods: In this randomised, double-blind, double placebo-controlled trial, patients were enrolled at 67 trial sites in the USA (60 sites), South Korea (two sites), Mexico (two sites), Singapore (two sites), and Japan (one site). Hospitalised adults (≥18 years) with COVID-19 who required supplemental oxygen administered by low-flow (≤15 L/min), high-flow (>15 L/min), or non-invasive mechanical ventilation modalities who met the study eligibility criteria (male or non-pregnant female adults ≥18 years old with laboratory-confirmed SARS-CoV-2 infection) were enrolled in the study. Patients were randomly assigned (1:1) to receive either baricitinib, remdesivir, and placebo, or dexamethasone, remdesivir, and placebo using a permuted block design. Randomisation was stratified by study site and baseline ordinal score at enrolment. All patients received remdesivir (≤10 days) and either baricitinib (or matching oral placebo) for a maximum of 14 days or dexamethasone (or matching intravenous placebo) for a maximum of 10 days. The primary outcome was the difference in mechanical ventilation-free survival by day 29 between the two treatment groups in the modified intention-to-treat population. Safety analyses were done in the as-treated population, comprising all participants who received one dose of the study drug. The trial is registered with ClinicalTrials.gov, NCT04640168., Findings: Between Dec 1, 2020, and April 13, 2021, 1047 patients were assessed for eligibility. 1010 patients were enrolled and randomly assigned, 516 (51%) to baricitinib plus remdesivir plus placebo and 494 (49%) to dexamethasone plus remdesivir plus placebo. The mean age of the patients was 58·3 years (SD 14·0) and 590 (58%) of 1010 patients were male. 588 (58%) of 1010 patients were White, 188 (19%) were Black, 70 (7%) were Asian, and 18 (2%) were American Indian or Alaska Native. 347 (34%) of 1010 patients were Hispanic or Latino. Mechanical ventilation-free survival by day 29 was similar between the study groups (Kaplan-Meier estimates of 87·0% [95% CI 83·7 to 89·6] in the baricitinib plus remdesivir plus placebo group and 87·6% [84·2 to 90·3] in the dexamethasone plus remdesivir plus placebo group; risk difference 0·6 [95% CI -3·6 to 4·8]; p=0·91). The odds ratio for improved status in the dexamethasone plus remdesivir plus placebo group compared with the baricitinib plus remdesivir plus placebo group was 1·01 (95% CI 0·80 to 1·27). At least one adverse event occurred in 149 (30%) of 503 patients in the baricitinib plus remdesivir plus placebo group and 179 (37%) of 482 patients in the dexamethasone plus remdesivir plus placebo group (risk difference 7·5% [1·6 to 13·3]; p=0·014). 21 (4%) of 503 patients in the baricitinib plus remdesivir plus placebo group had at least one treatment-related adverse event versus 49 (10%) of 482 patients in the dexamethasone plus remdesivir plus placebo group (risk difference 6·0% [2·8 to 9·3]; p=0·00041). Severe or life-threatening grade 3 or 4 adverse events occurred in 143 (28%) of 503 patients in the baricitinib plus remdesivir plus placebo group and 174 (36%) of 482 patients in the dexamethasone plus remdesivir plus placebo group (risk difference 7·7% [1·8 to 13·4]; p=0·012)., Interpretation: In hospitalised patients with COVID-19 requiring supplemental oxygen by low-flow, high-flow, or non-invasive ventilation, baricitinib plus remdesivir and dexamethasone plus remdesivir resulted in similar mechanical ventilation-free survival by day 29, but dexamethasone was associated with significantly more adverse events, treatment-related adverse events, and severe or life-threatening adverse events. A more individually tailored choice of immunomodulation now appears possible, where side-effect profile, ease of administration, cost, and patient comorbidities can all be considered., Funding: National Institute of Allergy and Infectious Diseases., Competing Interests: Declaration of interests We declare no competing interests., (Copyright © 2022 Elsevier Ltd. All rights reserved.)
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- 2022
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36. Enhanced Adipogenic Differentiation of Human Dental Pulp Stem Cells in Enzymatically Decellularized Adipose Tissue Solid Foams.
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Garcia-Urkia N, Luzuriaga J, Uribe-Etxebarria V, Irastorza I, Fernandez-San-Argimiro FJ, Olalde B, Briz N, Unda F, Ibarretxe G, Madarieta I, and Pineda JR
- Abstract
Engineered 3D human adipose tissue models and the development of physiological human 3D in vitro models to test new therapeutic compounds and advance in the study of pathophysiological mechanisms of disease is still technically challenging and expensive. To reduce costs and develop new technologies to study human adipogenesis and stem cell differentiation in a controlled in vitro system, here we report the design, characterization, and validation of extracellular matrix (ECM)-based materials of decellularized human adipose tissue (hDAT) or bovine collagen-I (bCOL-I) for 3D adipogenic stem cell culture. We aimed at recapitulating the dynamics, composition, and structure of the native ECM to optimize the adipogenic differentiation of human mesenchymal stem cells. hDAT was obtained by a two-enzymatic step decellularization protocol and post-processed by freeze-drying to produce 3D solid foams. These solid foams were employed either as pure hDAT, or combined with bCOL-I in a 3:1 proportion, to recreate a microenvironment compatible with stem cell survival and differentiation. We sought to investigate the effect of the adipogenic inductive extracellular 3D-microenvironment on human multipotent dental pulp stem cells (hDPSCs). We found that solid foams supported hDPSC viability and proliferation. Incubation of hDPSCs with adipogenic medium in hDAT-based solid foams increased the expression of mature adipocyte LPL and c/EBP gene markers as determined by RT-qPCR, with respect to bCOL-I solid foams. Moreover, hDPSC capability to differentiate towards adipocytes was assessed by PPAR-γ immunostaining and Oil-red lipid droplet staining. We found out that both hDAT and mixed 3:1 hDAT-COL-I solid foams could support adipogenesis in 3D-hDPSC stem cell cultures significantly more efficiently than solid foams of bCOL-I, opening the possibility to obtain hDAT-based solid foams with customized properties. The combination of human-derived ECM biomaterials with synthetic proteins can, thus, be envisaged to reduce fabrication costs, thus facilitating the widespread use of autologous stem cells and biomaterials for personalized medicine.
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- 2022
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37. A Mouse Model of Ulcerative Cutaneous Leishmaniasis by Leishmania (Viannia) panamensis to Investigate Infection, Pathogenesis, Immunity, and Therapeutics.
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Muñoz-Durango N, Gómez A, García-Valencia N, Roldán M, Ochoa M, Bautista-Erazo DE, and Ramírez-Pineda JR
- Abstract
A mouse model of cutaneous leishmaniasis (CL) by Leishmania (Viannia) panamensis (L(V)p) that reproduces the characteristics of the human disease remains elusive. Here we report the development of a CL model that uses a mouse-adapted L(V)p isolate to reproducibly induce a dermal disease with a remarkable similarity to human CL. BALB/c mice infected intradermally in the ear with 10
5 stationary UA-946 L(V)p promastigotes develop a progressive cutaneous disease that exhibits the typical ulcerated lesions with indurated borders observed in CL patients. Although most of parasites in the inoculum die within the first week of infection, the survivors vigorously multiply at the infection site during the following weeks, paralleling disease appearance and aggravation. Regional lymphadenopathy as well as lymphatic dissemination of parasites to draining lymph nodes (dLN) was evidenced early after infection. Viable parasites were also isolated from spleen at later timepoints indicating systemic parasitic dissemination, but, strikingly, no signs of systemic disease were observed. Increasing numbers of myeloid cells and T lymphocytes producing IFNγ and IL-4 were observed in the dLN as disease progressed. A mixed adaptive L(V)p -specific T cell-mediated response was induced, since ex vivo recall experiments using dLN cells and splenocytes revealed the production of type 1 (IFNγ, IL-2), type 2 (IL-4, IL-13), regulatory (IL-10), and inflammatory (GM-CSF, IL-3) cytokines. Humoral adaptive response was characterized by early production of IgG1- followed by IgG2a-type of L(V)p -specific antibodies. IFNγ/IL-4 and IgG2a/IgG1 ratios indicated that the initial non-protective Th2 response was redirected toward a protective Th1 response. In situ studies revealed a profuse recruitment of myeloid cells and of IFNγ- and IL-4-producing T lymphocytes to the site of infection, and the typical histopathological changes induced by dermotropic Leishmania species. Evidence that this model is suitable to investigate pharmacological and immunomodulatory interventions, as well as for antigen discovery and vaccine development, is also presented. Altogether, these results support the validity and utility of this novel mouse model to study the pathogenesis, immunity, and therapeutics of L(V)p infections., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Muñoz-Durango, Gómez, García-Valencia, Roldán, Ochoa, Bautista-Erazo and Ramírez-Pineda.)- Published
- 2022
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38. A Comparative Study of Cell Culture Conditions during Conversion from Primed to Naive Human Pluripotent Stem Cells.
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Romayor I, Herrera L, Burón M, Martin-Inaraja M, Prieto L, Etxaniz J, Inglés-Ferrándiz M, Pineda JR, and Eguizabal C
- Abstract
The successful reprogramming of human somatic cells into induced pluripotent stem cells (hiPSCs) represented a turning point in the stem cell research field, owing to their ability to differentiate into any cell type with fewer ethical issues than human embryonic stem cells (hESCs). In mice, PSCs are thought to exist in a naive state, the cell culture equivalent of the immature pre-implantation embryo, whereas in humans, PSCs are in a primed state, which is a more committed pluripotent state than a naive state. Recent studies have focused on capturing a similar cell stage in human cells. Given their earlier developmental stage and therefore lack of cell-of-origin epigenetic memory, these cells would be better candidates for further re-differentiation, use in disease modeling, regenerative medicine and drug discovery. In this study, we used primed hiPSCs and hESCs to evaluate the successful establishment and maintenance of a naive cell stage using three different naive-conversion media, both in the feeder and feeder-free cells conditions. In addition, we compared the directed differentiation capacity of primed and naive cells into the three germ layers and characterized these different cell stages with commonly used pluripotent and lineage-specific markers. Our results show that, in general, naive culture NHSM medium (in both feeder and feeder-free systems) confers greater hiPSCs and hESCs viability and the highest naive pluripotency markers expression. This medium also allows better cell differentiation cells toward endoderm and mesoderm.
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- 2022
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39. Self-expandable metal stents versus endoscopic balloon dilation for the treatment of strictures in Crohn's disease (ProtDilat study): an open-label, multicentre, randomised trial.
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Loras C, Andújar X, Gornals JB, Sanchiz V, Brullet E, Sicilia B, Martín-Arranz MD, Naranjo A, Barrio J, Dueñas C, Foruny JR, Busquets D, Monfort D, Pineda JR, González-Huix F, Pérez-Roldán F, Pons V, González B, Reyes Moreno J, Sainz E, Guardiola J, Bosca-Watts MM, Fernández-Bañares F, Mayor V, and Esteve M
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- Constriction, Pathologic etiology, Constriction, Pathologic therapy, Dilatation adverse effects, Dilatation methods, Endoscopy, Gastrointestinal methods, Humans, Stents adverse effects, Treatment Outcome, Crohn Disease complications, Crohn Disease therapy
- Abstract
Background: Endoscopic balloon dilation (EBD) is the established endoscopic treatment for short strictures in Crohn's disease. Fully covered self-expandable metal stents (FCSEMS) have been used for endoscopic treatment of patients for whom EBD was unsuccessful. We aimed to determine the efficacy and safety of the two endoscopic treatments in patients with Crohn's disease with stenosis and compare the mean cost of both treatments., Methods: This multicentre, open-label, randomised trial was done in 19 tertiary and secondary hospitals in Spain. Patients with Crohn's disease with obstructive symptoms and predominantly fibrotic strictures of less than 10 cm in length were eligible for inclusion. We excluded patients with stenosis treated with SEMS or EBD in the previous year and stenosis not accessible to a colonoscope. Patients were randomly assigned (1:1) to receive either EBD (EBD group) or FCSEMS (FCSEMS group) using a digital en-block randomisation system (block size of four). In the EBD group, dilation was done with a CRE Boston Scientific (Marlborough, MA, USA) pneumatic balloon with the diameter set at the discretion of the endoscopist; a maximum of two sessions of dilation were allowed with a minimum interval of 15-30 days between them. In the FCSEMS group, a 20 mm diameter Taewoong (Gimpo-si, South Korea) fully covered metal stent was placed; stent length was set at the discretion of the endoscopist. The primary outcome was to assess the efficacy of the endoscopic treatment, defined by the proportion of patients free of a new therapeutic intervention (EBD, FCSEMS, or surgery) due to symptomatic recurrence at 1 year of follow-up. Patients were analysed according to the intention-to-treat principle. Adverse events were recorded for all the patients; events were considered associated to be with the procedure when a causal association was possible, probable, or definite. This trial is registered with ClinicalTrials.gov, NCT02395354., Findings: From Aug 28, 2013, to Oct 9, 2017, we assessed the eligibility of 99 patients, of whom 19 (19%) patients were excluded. Thus, 80 (81%) patients were randomly assigned to treatment: 39 (49%) patients to the FCSEMS group and 41 (51%) patients to the EBD group. 33 (80%) of 41 patients in the EBD group and 20 (51%) of 39 patients in the FCSEMS group were free of a new therapeutic intervention at 1 year (odds ratio [OR] 3·9 [95% CI 1·4-10·6]; p=0·0061). Two (3%) of 80 patients had severe adverse events (one [2%] patient in the EBD group and one [3%] patient in the FCSEMS group); both patients had perforations., Interpretation: EBD is more effective than FCSEMS for Crohn's disease strictures, with a good safety profile for both treatments., Funding: Spanish National Institute of Health, Foundation of Spanish Society of Digestive Endoscopy, Catalan Society of Gastroenterology, and Taweoong., Competing Interests: Declaration of interests JBG reports consulting fees from Boston Scientific. JG has served as a speaker for Merck Sharp & Dohme, AbbVie, Kern Pharma, Takeda, Janssen, Pfizer, and Ferring; reports support for attending meetings from Merck Sharp & Dohme, AbbVie, and Janssen; and has served as an advisory member for Roche, Merck Sharp & Dohme, AbbVie, Kern Pharma, Takeda, Janssen, Pfizer, Ferring, Chiesi, and General Electric Healthcare. ES reports support for attending meetings from AbbVie, Biogen, Faes, Ferring, Janssen, Merck Sharp & Dohme, Pfizer, Takeda, and Tillots. FFB reports a grant from Biomedal; reports payment or honoraria for lectures, presentations, speakers bureaus, manuscript writing or educational events from General Electrics; and reports support for attending meetings from Tillots, Falk-Pharma, and Janssen. All other authors declare no competing interests., (Copyright © 2022 Elsevier Ltd. All rights reserved.)
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- 2022
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40. Osteogenic differentiation of human dental pulp stem cells in decellularised adipose tissue solid foams.
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Luzuriaga J, García-Gallastegui P, García-Urkia N, Pineda JR, Irastorza I, Fernandez-San-Argimiro FJ, Briz N, Olalde B, Unda F, Madarieta I, and Ibarretxe G
- Subjects
- Adipose Tissue, Animals, Cell Differentiation, Cells, Cultured, Dental Pulp, Humans, Stem Cells, Swine, Tissue Engineering, Tissue Scaffolds, Collagen Type I, Osteogenesis
- Abstract
3D cell culture systems based on biological scaffold materials obtainable from both animal and human tissues constitute very interesting tools for cell therapy and personalised medicine applications. The white adipose tissue (AT) extracellular matrix (ECM) is a very promising biomaterial for tissue engineering due to its easy accessibility, malleability and proven biological activity. In the present study, human dental pulp stem cells (hDPSCs) were combined in vitro with ECM scaffolds from porcine and human decellularised adipose tissues (pDAT, hDAT) processed as 3D solid foams, to investigate their effects on the osteogenic differentiation capacity and bone matrix production of hDPSCs, compared to single-protein-based 3D solid foams of collagen type I and conventional 2D tissue-culture-treated polystyrene plates. pDAT solid foams supported the osteogenic differentiation of hDPSCs to similar levels to collagen type I, as assessed by alkaline phosphatase and alizarin red stainings, reverse transcription quantitative real-time polymerase chain reaction (RT-qPCR) and osteocalcin/bone gamma-carboxyglutamate protein (BGLAP) immunostaining. Interestingly, hDAT solid foams showed a markedly lower capacity to sustain hDPSC osteogenic differentiation and matrix calcification and a higher capacity to support adipogenesis, as assessed by RT-qPCR and oil red O staining. White ATs from both human and porcine origins are relatively abundant and available sources of raw material to obtain high quality ECM-derived biomedical products. These biomaterials could have promising applications in tissue engineering and personalised clinical therapy for the healing and regeneration of lesions involving not only a loss of calcified bone but also its associated soft non-calcified tissues.
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- 2022
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41. Incidence of inflammatory bowel disease and phenotype at diagnosis in 2011: results of the Epi-IBD 2011 study in the Vigo area.
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Hernández V, de Castro ML, Salinas-Rojo M, Fernández A, Martínez-Ares D, Sanromán L, Pineda JR, Carmona A, Salgado-Álvarez C, Martínez-Cadilla J, Pereira S, García-Burriel JI, González-Portela C, Vázquez S, and Rodríguez-Prada JI
- Subjects
- Cohort Studies, Humans, Incidence, Phenotype, Prospective Studies, Colitis, Ulcerative diagnosis, Colitis, Ulcerative epidemiology, Crohn Disease diagnosis, Crohn Disease epidemiology, Inflammatory Bowel Diseases diagnosis, Inflammatory Bowel Diseases epidemiology
- Abstract
Objective: to validate the incidence of inflammatory bowel disease (IBD) reported in Vigo in 2010 within the Epi-IBD study, which was the highest incidence reported so far in Spain., Methods: an epidemiological, prospective, population-based inception cohort study. All incident cases of IBD living in the Vigo area at diagnosis from January 1 to December 31, 2011 were included., Results: one hundred patients were diagnosed (62 % men; median age, 43.27 years): 49 with ulcerative colitis (UC), 34 with Crohn's disease (CD), and 17 with IBD unclassified (IBDU). The incidence (per 100,000 inhabitants/year) was 17.56 (CD: 5.97; UC: 8.60; IBDU: 2.98), similar to that reported in 2010. The incidence in the non-pediatric population was 19.66 (CD: 6.89, UC: 9.52; IBDU: 3.04). CD and UC phenotype was similar in 2010 and 2011., Conclusion: this study supports the increased incidence of EII in the Vigo area reported in 2010.
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- 2022
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42. In vitro preparation of human Dental Pulp Stem Cell grafts with biodegradable polymer scaffolds for nerve tissue engineering.
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Pineda JR, Polo Y, Pardo-Rodríguez B, Luzuriaga J, Uribe-Etxebarria V, García-Gallastegui P, Sarasua JR, Larrañaga A, and Ibarretxe G
- Subjects
- Cell Differentiation, Cell Proliferation, Cells, Cultured, Dental Pulp, Humans, Polymers, Stem Cells, Tissue Scaffolds, Nerve Tissue, Tissue Engineering methods
- Abstract
Human Dental Pulp Stem Cells (hDPSCs) are one of the most promising stem cell sources for tissue engineering and regeneration, due to their extraordinary multi-lineage differentiation ability, ease of extraction from biological waste in dental clinics, safe non-tumorigenic phenotype, immune-tolerance upon in vivo transplantation, and great possibilities of application in autologous tissue reconstruction. The in vitro manipulation of hDPSCs paves the way for drug screening and tailor-made regeneration of damaged tissues, in the context of personalized medicine. The neural crest phenotype of these stem cells gives them the capacity to differentiate to a large variety of cell types, including neural-lineage cells. In this chapter, we describe various culture methods to generate different cellular phenotypes from hDPSCs, which can not only grow as mesenchymal-like plastic adherent cells, but also as non-adherent neurogenic dentospheres in serum-free medium. Floating dentospheres can be used to generate large populations of mature neuronal and glial marker expressing cells, which may be cultured over a substrate of nanopatterned scaffold based on biodegradable poly(lactide-co-caprolactone) (PLCL) to induce a controlled alignment of neurites and cell migration, to generate in vivo biocompatible constructs for nerve tissue bioengineering., Competing Interests: Disclosures A.L., J.R.P., J.L., Y.P., B.P.R., P.G.G., V.U.E. and G.I. have no conflicts of interest to disclose. J.R.S. declares consulting/advisory fees from Polimerbio S.L., (Copyright © 2022 Elsevier Inc. All rights reserved.)
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- 2022
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43. shinyCurves, a shiny web application to analyse multisource qPCR amplification data: a COVID-19 case study.
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Olaechea-Lázaro S, García-Santisteban I, Pineda JR, Badiola I, Alonso S, Bilbao JR, and Fernandez-Jimenez N
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- Data Analysis, Humans, Pandemics, Real-Time Polymerase Chain Reaction, SARS-CoV-2, COVID-19
- Abstract
Background: Quantitative, reverse transcription PCR (qRT-PCR) is currently the gold-standard for SARS-CoV-2 detection and it is also used for detection of other virus. Manual data analysis of a small number of qRT-PCR plates per day is a relatively simple task, but automated, integrative strategies are needed if a laboratory is dealing with hundreds of plates per day, as is being the case in the COVID-19 pandemic., Results: Here we present shinyCurves, an online shiny-based, free software to analyze qRT-PCR amplification data from multi-plate and multi-platform formats. Our shiny application does not require any programming experience and is able to call samples Positive, Negative or Undetermined for viral infection according to a number of user-defined settings, apart from providing a complete set of melting and amplification curve plots for the visual inspection of results., Conclusions: shinyCurves is a flexible, integrative and user-friendly software that speeds-up the analysis of massive qRT-PCR data from different sources, with the possibility of automatically producing and evaluating melting and amplification curve plots., (© 2021. The Author(s).)
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- 2021
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44. IL-10-Dependent Amelioration of Chronic Inflammatory Disease by Microdose Subcutaneous Delivery of a Prototypic Immunoregulatory Small Molecule.
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Tabares-Guevara JH, Jaramillo JC, Ospina-Quintero L, Piedrahíta-Ochoa CA, García-Valencia N, Bautista-Erazo DE, Caro-Gómez E, Covián C, Retamal-Díaz A, Duarte LF, González PA, Bueno SM, Riedel CA, Kalergis AM, and Ramírez-Pineda JR
- Subjects
- Animals, Apolipoproteins E physiology, Atherosclerosis prevention & control, Chronic Disease, Curcumin pharmacology, Lipids blood, Mice, Mice, Inbred C57BL, Neuroprotection, Curcumin administration & dosage, Immunomodulating Agents administration & dosage, Inflammation prevention & control, Interleukin-10 physiology
- Abstract
One of the interventional strategies to reestablish the immune effector/regulatory balance, that is typically altered in chronic inflammatory diseases (CID), is the reinforcement of endogenous immunomodulatory pathways as the one triggered by interleukin (IL)-10. In a recent work, we demonstrated that the subcutaneous (sc) administration of an IL-10/Treg-inducing small molecule-based formulation, using a repetitive microdose (REMID) treatment strategy to preferentially direct the effects to the regional immune system, delays the progression of atherosclerosis. Here we investigated whether the same approach using other IL-10-inducing small molecule, such as the safe, inexpensive, and widely available polyphenol curcumin, could induce a similar protective effect in two different CID models. We found that, in apolipoprotein E deficient mice, sc treatment with curcumin following the REMID strategy induced atheroprotection that was not consequence of its direct systemic lipid-modifying or antioxidant activity, but instead paralleled immunomodulatory effects, such as reduced proatherogenic IFNγ/TNFα-producing cells and increased atheroprotective FOXP3
+ Tregs and IL-10-producing dendritic and B cells. Remarkably, when a similar strategy was used in the neuroinflammatory model of experimental autoimmune encephalomyelitis (EAE), significant clinical and histopathological protective effects were evidenced, and these were related to an improved effector/regulatory cytokine balance in restimulated splenocytes. The essential role of curcumin-induced IL-10 for neuroprotection was confirmed by the complete abrogation of the clinical effects in IL-10-deficient mice. Finally, the translational therapeutic prospection of this strategy was evidenced by the neuroprotection observed in mice starting the treatment one week after disease triggering. Collectively, results demonstrate the power of a simple natural IL-10-inducing small molecule to tackle chronic inflammation, when its classical systemic and direct pharmacological view is shifted towards the targeting of regional immune cells, in order to rationally harness its immunopharmacological potential. This shift implies that many well-known IL-10-inducing small molecules could be easily reformulated and repurposed to develop safe, innovative, and accessible immune-based interventions for CID., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Tabares-Guevara, Jaramillo, Ospina-Quintero, Piedrahíta-Ochoa, García-Valencia, Bautista-Erazo, Caro-Gómez, Covián, Retamal-Díaz, Duarte, González, Bueno, Riedel, Kalergis and Ramírez-Pineda.)- Published
- 2021
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45. Advances and Perspectives in Dental Pulp Stem Cell Based Neuroregeneration Therapies.
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Luzuriaga J, Polo Y, Pastor-Alonso O, Pardo-Rodríguez B, Larrañaga A, Unda F, Sarasua JR, Pineda JR, and Ibarretxe G
- Subjects
- Cell Differentiation, Extracellular Vesicles physiology, Humans, Neuroglia cytology, Stem Cell Transplantation, Stem Cells physiology, Tissue Engineering methods, Tissue Scaffolds, Cell- and Tissue-Based Therapy methods, Dental Pulp cytology, Nerve Regeneration physiology, Stem Cells cytology
- Abstract
Human dental pulp stem cells (hDPSCs) are some of the most promising stem cell types for regenerative therapies given their ability to grow in the absence of serum and their realistic possibility to be used in autologous grafts. In this review, we describe the particular advantages of hDPSCs for neuroregenerative cell therapies. We thoroughly discuss the knowledge about their embryonic origin and characteristics of their postnatal niche, as well as the current status of cell culture protocols to maximize their multilineage differentiation potential, highlighting some common issues when assessing neuronal differentiation fates of hDPSCs. We also review the recent progress on neuroprotective and immunomodulatory capacity of hDPSCs and their secreted extracellular vesicles, as well as their combination with scaffold materials to improve their functional integration on the injured central nervous system (CNS) and peripheral nervous system (PNS). Finally, we offer some perspectives on the current and possible future applications of hDPSCs in neuroregenerative cell therapies., Competing Interests: The authors declare no conflicts of interest.
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- 2021
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46. Stem and Cancer Stem Cell Identities, Cellular Markers, Niche Environment and Response to Treatments to Unravel New Therapeutic Targets.
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Pineda JR, Badiola I, and Ibarretxe G
- Abstract
Adult stem cells are a partially quiescent cell population responsible for natural cell renewal and are found in many different regions of the body, including the brain, teeth, bones, muscles, skin, and diverse epithelia, such as the epidermal or intestinal epithelium, among others [...].
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- 2021
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47. Nanostructured scaffolds based on bioresorbable polymers and graphene oxide induce the aligned migration and accelerate the neuronal differentiation of neural stem cells.
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Polo Y, Luzuriaga J, Iturri J, Irastorza I, Toca-Herrera JL, Ibarretxe G, Unda F, Sarasua JR, Pineda JR, and Larrañaga A
- Subjects
- Animals, Cell Differentiation physiology, Graphite chemistry, Mice, Nanofibers chemistry, Nanostructures chemistry, Neural Stem Cells cytology, Neural Stem Cells metabolism, Tissue Engineering methods, Tissue Scaffolds chemistry, Polymers chemistry
- Abstract
Within the field of neural tissue engineering, there is a huge need for the development of materials that promote the adhesion, aligned migration and differentiation of stem cells into neuronal and supportive glial cells. In this study, we have fabricated bioresorbable elastomeric scaffolds combining an ordered nanopatterned topography together with a surface functionalization with graphene oxide (GO) in mild conditions. These scaffolds allowed the attachment of murine neural stem cells (NSCs) without the need of any further coating of its surface with extracellular matrix adhesion proteins. The NSCs were able to give rise to both immature neurons and supporting glial cells over the nanostructured scaffolds in vitro, promoting their aligned migration in cell clusters following the nanostructured grooves. This system has the potential to reestablish spatially oriented neural precursor cell connectivity, constituting a promising tool for future cellular therapy including nerve tissue regeneration., (Copyright © 2020 Elsevier Inc. All rights reserved.)
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- 2021
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48. Is There Such a Thing as a Genuine Cancer Stem Cell Marker? Perspectives from the Gut, the Brain and the Dental Pulp.
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Crende O, García-Gallastegui P, Luzuriaga J, Badiola I, de la Hoz C, Unda F, Ibarretxe G, and Pineda JR
- Abstract
The conversion of healthy stem cells into cancer stem cells (CSCs) is believed to underlie tumor relapse after surgical removal and fuel tumor growth and invasiveness. CSCs often arise from the malignant transformation of resident multipotent stem cells, which are present in most human tissues. Some organs, such as the gut and the brain, can give rise to very aggressive types of cancers, contrary to the dental pulp, which is a tissue with a very remarkable resistance to oncogenesis. In this review, we focus on the similarities and differences between gut, brain and dental pulp stem cells and their related CSCs, placing a particular emphasis on both their shared and distinctive cell markers, including the expression of pluripotency core factors. We discuss some of their similarities and differences with regard to oncogenic signaling, telomerase activity and their intrinsic propensity to degenerate to CSCs. We also explore the characteristics of the events and mutations leading to malignant transformation in each case. Importantly, healthy dental pulp stem cells (DPSCs) share a great deal of features with many of the so far reported CSC phenotypes found in malignant neoplasms. However, there exist literally no reports about the contribution of DPSCs to malignant tumors. This raises the question about the particularities of the dental pulp and what specific barriers to malignancy might be present in the case of this tissue. These notable differences warrant further research to decipher the singular properties of DPSCs that make them resistant to transformation, and to unravel new therapeutic targets to treat deadly tumors.
- Published
- 2020
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49. Vasculogenesis from Human Dental Pulp Stem Cells Grown in Matrigel with Fully Defined Serum-Free Culture Media.
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Luzuriaga J, Irurzun J, Irastorza I, Unda F, Ibarretxe G, and Pineda JR
- Abstract
The generation of vasculature is one of the most important challenges in tissue engineering and regeneration. Human dental pulp stem cells (hDPSCs) are some of the most promising stem cell types to induce vasculogenesis and angiogenesis as they not only secrete vascular endothelial growth factor (VEGF) but can also differentiate in vitro into both endotheliocytes and pericytes in serum-free culture media. Moreover, hDPSCs can generate complete blood vessels containing both endothelial and mural layers in vivo, upon transplantation into the adult brain. However, many of the serum free media employed for the growth of hDPSCs contain supplements of an undisclosed composition. This generates uncertainty as to which of its precise components are necessary and which are dispensable for the vascular differentiation of hDPSCs, and also hinders the transfer of basic research findings to clinical cell therapy. In this work, we designed and tested new endothelial differentiation media with a fully defined composition using standard basal culture media supplemented with a mixture of B27, heparin and growth factors, including VEGF-A165 at different concentrations. We also optimized an in vitro Matrigel assay to characterize both the ability of hDPSCs to differentiate to vascular cells and their capacity to generate vascular tubules in 3D cultures. The description of a fully defined serum-free culture medium for the induction of vasculogenesis using human adult stem cells highlights its potential as a relevant innovation for tissue engineering applications. In conclusion, we achieved efficient vasculogenesis starting from hDPSCs using serum-free culture media with a fully defined composition, which is applicable for human cell therapy purposes.
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- 2020
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50. The HIF1α/JMY pathway promotes glioblastoma stem-like cell invasiveness after irradiation.
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Gauthier LR, Saati M, Bensalah-Pigeon H, Ben M'Barek K, Gitton-Quent O, Bertrand R, Busso D, Mouthon MA, Collura A, Junier MP, Chneiweiss H, Pineda JR, and Boussin FD
- Subjects
- Cell Line, Tumor, Cell Movement genetics, Cell Movement radiation effects, Cell Nucleus metabolism, Cell Nucleus radiation effects, Cytoplasm metabolism, Cytoplasm radiation effects, Humans, Hypoxia-Inducible Factor 1, alpha Subunit genetics, Nuclear Proteins genetics, Radiation, Ionizing, Signal Transduction genetics, Signal Transduction radiation effects, Trans-Activators genetics, Glioblastoma metabolism, Glioblastoma pathology, Glioma metabolism, Glioma pathology, Hypoxia-Inducible Factor 1, alpha Subunit metabolism, Nuclear Proteins metabolism, Trans-Activators metabolism
- Abstract
Human glioblastoma (GBM) is the most common primary malignant brain tumor. A minor subpopulation of cancer cells, known as glioma stem-like cells (GSCs), are thought to play a major role in tumor relapse due to their stem cell-like properties, their high resistance to conventional treatments and their high invasion capacity. We show that ionizing radiation specifically enhances the motility and invasiveness of human GSCs through the stabilization and nuclear accumulation of the hypoxia-inducible factor 1α (HIF1α), which in turn transcriptionally activates the Junction-mediating and regulatory protein (JMY). Finally, JMY accumulates in the cytoplasm where it stimulates GSC migration via its actin nucleation-promoting activity. Targeting JMY could thus open the way to the development of new therapeutic strategies to improve the efficacy of radiotherapy and prevent glioma recurrence.
- Published
- 2020
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