20 results on '"Correll, K."'
Search Results
2. Activation of Yes-Associated Protein (YAP) Is Dependent on the Degree of Injury in Cell Culture Models of Acute Lung Injury
- Author
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Odackal, J., primary, Lee, E., additional, Roybal, H., additional, Correll, K., additional, Beke, K., additional, Riches, D.W.H., additional, Bridges, J.P., additional, Aschner, Y., additional, Koenigshoff, M., additional, and Downey, G.P., additional
- Published
- 2022
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3. Yes-Associated Protein (YAP) Is Critical in Epithelial Repair After Acute Lung Injury
- Author
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Odackal, J., primary, Roybal, H., additional, Correll, K., additional, Riches, D.W.H., additional, Bridges, J.P., additional, Aschner, Y., additional, Koenigshoff, M., additional, and Downey, G.P., additional
- Published
- 2021
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4. POSTNATAL TRANSFER AND RECOVERY OF MATERNAL T CELLS AND B CELLS IN THE OFFSPRING: ONL-920
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YANG, J, GABEHART, K, CORRELL, K, COLLINS, M, GELFAND, E, and DAKHAMA, A
- Published
- 2011
5. Corrigendum to An overview of the safety pharmacology society strategic plan [Journal of Pharmacological and Toxicological Methods 93 (2018) 35–45]
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Pugsley, M.K., primary, Authier, S., additional, Koerner, J.E., additional, Redfern, W.S., additional, Markgraf, C.G., additional, Brabham, T., additional, Correll, K., additional, Soloviev, M.V., additional, Botchway, A., additional, Engwall, M., additional, Traebert, M., additional, Valentin, J.-P., additional, Mow, T.J., additional, Greiter-Wilke, A., additional, Leishman, D.J., additional, and Vargas, H.M., additional
- Published
- 2019
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- View/download PDF
6. Safety considerations for configuring LXI-based ATE systems when IP addresses become logical addresses.
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Headrick, W.J., Correll, K., and Sarfi, T.
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- 2009
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7. Implementing Neon: a 256-bit graphics accelerator
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McCormack, J., primary, McNamara, R., additional, Gianos, C., additional, Jouppi, N.P., additional, Dutton, T., additional, Zurawski, J., additional, Seiler, L., additional, and Correll, K., additional
- Published
- 1999
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8. An overview of the safety pharmacology society strategic plan.
- Author
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Pugsley, M.K., Authier, S., Koerner, J.E., Redfern, W.S., Markgraf, C.G., Brabham, T., Correll, K., Soloviev, M.V., Botchway, A., Engwall, M., Traebert, M., Valentin, J.-P., Mow, T.J., Greiter-Wilke, A., Leishman, D.J., and Vargas, H.M.
- Subjects
- *
STRATEGIC planning , *PHARMACOLOGY , *PRIMARY education , *MEDICAL technology , *SCIENTIFIC community , *SAFETY - Abstract
Safety Pharmacology studies are conducted to characterize the confidence by which biologically active new chemical entities (NCE) may be anticipated as safe. Non-clinical safety pharmacology studies aim to detect and characterize potentially undesirable pharmacodynamic activities using an array of in silico, in vitro and in vivo animal models. While a broad spectrum of methodological innovation and advancement of the science occurs within the Safety Pharmacology Society, the society also focuses on partnerships with health authorities and technology providers and facilitates interaction with organizations of common interest such as pharmacology, physiology, neuroscience, cardiology and toxicology. Education remains a primary emphasis for the society through content derived from regional and annual meetings, webinars and publication of its works it seeks to inform the general scientific and regulatory community. In considering the future of safety pharmacology the society has developed a strategy to successfully navigate forward and not be mired in stagnation of the discipline. Strategy can be defined in numerous ways but generally involves establishing and setting goals, determining what actions are needed to achieve those goals, and mobilizing resources within the society to accomplish the actions. The discipline remains in rapid evolution and its coverage is certain to expand to provide better guidance for more systems in the next few years. This overview from the Safety Pharmacology Society will outline the strategic plan from 2016 to 2018 and beyond and provide insight into the future of the discipline which builds upon a previous strategic plan established in 2009. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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9. Saracatinib, a Selective Src Kinase Inhibitor, Blocks Fibrotic Responses in Preclinical Models of Pulmonary Fibrosis.
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Ahangari F, Becker C, Foster DG, Chioccioli M, Nelson M, Beke K, Wang X, Justet A, Adams T, Readhead B, Meador C, Correll K, Lili LN, Roybal HM, Rose KA, Ding S, Barnthaler T, Briones N, DeIuliis G, Schupp JC, Li Q, Omote N, Aschner Y, Sharma L, Kopf KW, Magnusson B, Hicks R, Backmark A, Dela Cruz CS, Rosas I, Cousens LP, Dudley JT, Kaminski N, and Downey GP
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- Animals, Humans, Mice, Bleomycin adverse effects, Fibroblasts metabolism, Fibrosis, Lung pathology, src-Family Kinases metabolism, Transforming Growth Factor beta metabolism, Idiopathic Pulmonary Fibrosis drug therapy, Protein Kinase Inhibitors therapeutic use
- Abstract
Rationale: Idiopathic pulmonary fibrosis (IPF) is a chronic, progressive, and often fatal disorder. Two U.S. Food and Drug Administration-approved antifibrotic drugs, nintedanib and pirfenidone, slow the rate of decline in lung function, but responses are variable and side effects are common. Objectives: Using an in silico data-driven approach, we identified a robust connection between the transcriptomic perturbations in IPF disease and those induced by saracatinib, a selective Src kinase inhibitor originally developed for oncological indications. Based on these observations, we hypothesized that saracatinib would be effective at attenuating pulmonary fibrosis. Methods: We investigated the antifibrotic efficacy of saracatinib relative to nintedanib and pirfenidone in three preclinical models: 1 ) in vitro in normal human lung fibroblasts; 2 ) in vivo in bleomycin and recombinant Ad-TGF-β (adenovirus transforming growth factor-β) murine models of pulmonary fibrosis; and 3 ) ex vivo in mice and human precision-cut lung slices from these two murine models as well as patients with IPF and healthy donors. Measurements and Main Results: In each model, the effectiveness of saracatinib in blocking fibrogenic responses was equal or superior to nintedanib and pirfenidone. Transcriptomic analyses of TGF-β-stimulated normal human lung fibroblasts identified specific gene sets associated with fibrosis, including epithelial-mesenchymal transition, TGF-β, and WNT signaling that was uniquely altered by saracatinib. Transcriptomic analysis of whole-lung extracts from the two animal models of pulmonary fibrosis revealed that saracatinib reverted many fibrogenic pathways, including epithelial-mesenchymal transition, immune responses, and extracellular matrix organization. Amelioration of fibrosis and inflammatory cascades in human precision-cut lung slices confirmed the potential therapeutic efficacy of saracatinib in human lung fibrosis. Conclusions: These studies identify novel Src-dependent fibrogenic pathways and support the study of the therapeutic effectiveness of saracatinib in IPF treatment.
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- 2022
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10. Barriers and facilitators for Indigenous students and staff in health and human services educational programs.
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Joy-Correll K, Nevill E, Bird-Matheson H, McLennan H, Quinn A, Mayer Y, and Jarus T
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- Colonialism, Humans, Health Services, Indigenous, Students
- Abstract
Indigenous Peoples are underrepresented in many of the Health and Human Services Educational Programs (HHSEP, e.g.: Nursing, Social Work). As various studies have reported the benefits of diversifying HHSEP, the barriers and facilitators of increasing the number of Indigenous Peoples in these professions must be identified. The purpose of this exploratory study is to identify and understand the barriers and facilitators Indigenous Peoples face when entering, learning or working in HHSEP. A narrative approach was used in the facilitation of culturally safe sharing circles with Indigenous students and staff to collect perspectives based on their individual experiences in HHSEP. Inductive thematic analysis was used to identify emerging themes in participant experiences and the impact of those experiences on participation in learning and working at the university in these educational programs. Results from this exploratory study identified current academic structures and ideologies rooted in colonialism, that act as barriers for engagement and inclusion of Indigenous students, staff, and clinical and academic faculty. These findings shaped the main themes of this study including negotiation of identity in different spaces, negotiating colonial structures in HHSEP, and negotiating changes and transitions in HHSEP. We anticipate these preliminary results will act as a catalyst for uncovering further changes to be made regarding attitudes, procedures, and practices present in an academic environment that limit the inclusion of Indigenous Peoples in HHSEP., (© 2022. The Author(s), under exclusive licence to Springer Nature B.V.)
- Published
- 2022
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11. INSPIRE: A European training network to foster research and training in cardiovascular safety pharmacology.
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Guns PD, Guth BD, Braam S, Kosmidis G, Matsa E, Delaunois A, Gryshkova V, Bernasconi S, Knot HJ, Shemesh Y, Chen A, Markert M, Fernández MA, Lombardi D, Grandmont C, Cillero-Pastor B, Heeren RMA, Martinet W, Woolard J, Skinner M, Segers VFM, Franssen C, Van Craenenbroeck EM, Volders PGA, Pauwelyn T, Braeken D, Yanez P, Correll K, Yang X, Prior H, Kismihók G, De Meyer GRY, and Valentin JP
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- Humans, Safety, Cardiovascular System drug effects, Drug Development methods, Drug-Related Side Effects and Adverse Reactions prevention & control, Pharmacology methods
- Abstract
Safety pharmacology is an essential part of drug development aiming to identify, evaluate and investigate undesirable pharmacodynamic properties of a drug primarily prior to clinical trials. In particular, cardiovascular adverse drug reactions (ADR) have halted many drug development programs. Safety pharmacology has successfully implemented a screening strategy to detect cardiovascular liabilities, but there is room for further refinement. In this setting, we present the INSPIRE project, a European Training Network in safety pharmacology for Early Stage Researchers (ESRs), funded by the European Commission's H2020-MSCA-ITN programme. INSPIRE has recruited 15 ESR fellows that will conduct an individual PhD-research project for a period of 36 months. INSPIRE aims to be complementary to ongoing research initiatives. With this as a goal, an inventory of collaborative research initiatives in safety pharmacology was created and the ESR projects have been designed to be complementary to this roadmap. Overall, INSPIRE aims to improve cardiovascular safety evaluation, either by investigating technological innovations or by adding mechanistic insight in emerging safety concerns, as observed in the field of cardio-oncology. Finally, in addition to its hands-on research pillar, INSPIRE will organize a number of summer schools and workshops that will be open to the wider community as well. In summary, INSPIRE aims to foster both research and training in safety pharmacology and hopes to inspire the future generation of safety scientists., Competing Interests: Declaration of Competing Interest The views expressed in this publication are those of the authors and do not necessarily represent the decisions, policy or views of their respective institutions., (Copyright © 2020 The Authors. Published by Elsevier Inc. All rights reserved.)
- Published
- 2020
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12. An Industry Survey With Focus on Cardiovascular Safety Pharmacology Study Design and Data Interpretation.
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Authier S, Abernathy MM, Correll K, Chui RW, Dalton J, Foley CM, Friedrichs GS, Koerner JE, Kallman MJ, Pannirselvam M, Redfern WS, Urmaliya V, Valentin JP, Wisialowski T, Zabka TS, and Pugsley MK
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- Animals, Cardiovascular System, Data Interpretation, Statistical, Drug Industry, Humans, Research Design, Surveys and Questionnaires, Cardiovascular Diseases chemically induced, Drug Evaluation, Preclinical methods, Drug-Related Side Effects and Adverse Reactions, Pharmacology methods
- Abstract
Introduction: The Safety Pharmacology Society (SPS) conducted a membership survey to examine industry practices related mainly to cardiovascular (CV) safety pharmacology (SP)., Methods: Questions addressed nonclinical study design, data analysis methods, drug-induced effects, and conventional and novel CV assays., Results: The most frequent therapeutic area targeted by drugs developed by the companies/institutions that employ survey responders was oncology. The most frequently observed drug-mediated effects included an increased heart rate, increased arterial blood pressure, hERG (I
Kr ) block, decreased arterial blood pressure, decreased heart rate, QTc prolongation, and changes in body temperature. Broadly implemented study practices included Latin square crossover study design with n = 4 for nonrodent CV studies, statistical analysis of data (eg, analysis of variance), use of arrhythmia detection software, and the inclusion of data from all study animals when integrating SP studies into toxicology studies. Most responders frequently used individual animal housing conditions. Responders commonly evaluated drug effects on multiple ion channels, but in silico modeling methods were used much less frequently. Most responders rarely measured the J-Tpeak interval in CV studies. Uncertainties relative to Standard for Exchange of Nonclinical Data applications for data derived from CV SP studies were common. Although available, the use of human induced pluripotent stem cell cardiomyocytes remains rare. The respiratory SP study was rarely involved with identifying drug-induced functional issues. Responders indicated that the study-derived no observed effect level was more frequently determined than the no observed adverse effect level in CV SP studies; however, a large proportion of survey responders used neither.- Published
- 2020
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13. IL-13 induces periostin and eotaxin expression in human primary alveolar epithelial cells: Comparison with paired airway epithelial cells.
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Ito Y, Al Mubarak R, Roberts N, Correll K, Janssen W, Finigan J, Mishra R, and Chu HW
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- Adolescent, Adult, Cell Adhesion Molecules metabolism, Cells, Cultured, Chemokine CCL11 metabolism, Female, Gene Expression Regulation drug effects, Humans, Male, Middle Aged, Primary Cell Culture, Up-Regulation drug effects, Alveolar Epithelial Cells cytology, Alveolar Epithelial Cells drug effects, Alveolar Epithelial Cells metabolism, Cell Adhesion Molecules genetics, Chemokine CCL11 genetics, Epithelial Cells cytology, Epithelial Cells drug effects, Epithelial Cells metabolism, Interleukin-13 pharmacology, Respiratory Mucosa cytology, Respiratory Mucosa drug effects, Respiratory Mucosa metabolism
- Abstract
Alveolar epithelial cells are critical to the pathogenesis of pulmonary inflammation and fibrosis, which are associated with overexpression of type 2 cytokine IL-13. IL-13 is known to induce the production of profibrotic (e.g., periostin) and pro-inflammatory (e.g., eotaxin-3) mediators in human airway epithelial cells, but it remains unclear if human primary alveolar epithelial cells increase periostin and eotaxin expression following IL-13 stimulation. The goals of this study are to determine if alveolar epithelial cells increase periostin and eotaxin expression upon IL-13 stimulation, and if alveolar and airway epithelial cells from the same subjects have similar responses to IL-13. Paired alveolar and airway epithelial cells were isolated from donors without any lung disease, and cultured under submerged or air-liquid interface conditions with or without IL-13. Up-regulation of periostin protein and mRNA was observed in IL-13-stimulated alveolar epithelial cells, which was comparable to that in IL-13-stimulated paired airway epithelial cells. IL-13 also increased eotaxin-3 expression in alveolar epithelial cells, but the level of eotaxin mRNA was lower in alveolar epithelial cells than in airway epithelial cells. Our findings demonstrate that human alveolar epithelial cells are able to produce periostin and eotaxin in responses to IL-13 stimulation. This study suggests the need to further determine the contribution of alveolar epithelial cell-derived mediators to pulmonary fibrosis.
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- 2018
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14. The Safety Pharmacology Society salary survey.
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Pugsley MK, Authier S, Brabham T, Soloviev M, Markgraf CG, Correll K, Traebert M, Greiter-Wilke A, Valentin JP, Vargas H, Botchway A, Leishman DJ, and Curtis MJ
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- Adult, Female, Humans, Male, Middle Aged, Surveys and Questionnaires, Pharmacology economics, Salaries and Fringe Benefits statistics & numerical data, Societies economics, Toxicology economics
- Abstract
Introduction: Safety pharmacology is a growing discipline with scientists broadly distributed across international geographical regions. This electronic salary survey is the first to be distributed amongst the entire Safety Pharmacology Society (SPS) membership. An electronic survey was sent to all members of the Society. Categorical survey questions assessed membership employment types, annual incomes, and professional certifications, along with other associated career attributes., Methods: This survey was distributed to the SPS membership that is comprised of safety pharmacologists, toxicologists and pharmacologists working globally in the pharmaceutical industry, at contract research organizations (CRO), regulatory agencies, and academia or within the technology provider industry. The survey was open for responses from December 2015 to March 2016., Results: The survey response rate was 28% (129/453). North America (68%) was the region with the largest number of respondents followed by Europe (28%). A preponderance of respondents (77%) had 12years of industry experience or more. 52% of responders earned annually between $40,000 and $120,000. As expected, salary was generally positively correlated with the number of years of experience in the industry or the educational background but there was no correlation between salary and the number of employee's directly supervised. The median salary was higher for male vs female respondents, but so was median age, indicative of no gender 'salary gap'., Discussion: Our 2016 SPS salary survey results showcased significant diversity regarding factors that can influence salary compensation within this discipline. These data provided insights into the complex global job market trends. They also revealed the level of scientific specialization embedded within the organization, presently uniquely positioned to support the dynamic career paths of current and future safety pharmacologists., (Copyright © 2017 Elsevier Inc. All rights reserved.)
- Published
- 2017
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15. Proarrhythmia liability assessment and the comprehensive in vitro Proarrhythmia Assay (CiPA): An industry survey on current practice.
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Authier S, Pugsley MK, Koerner JE, Fermini B, Redfern WS, Valentin JP, Vargas HM, Leishman DJ, Correll K, and Curtis MJ
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- Animals, Calcium Channel Blockers pharmacology, Computer Simulation, Drug Industry, Electrocardiography drug effects, Humans, Induced Pluripotent Stem Cells, Ion Channels, Long QT Syndrome chemically induced, Myocytes, Cardiac drug effects, Sodium Channel Blockers pharmacology, Surveys and Questionnaires, Telemetry, Arrhythmias, Cardiac chemically induced
- Abstract
Introduction: The Safety Pharmacology Society (SPS) has conducted a survey of its membership to identify industry practices related to testing considered in the Comprehensive In vitro Proarrhythmia Assay (CiPA)., Methods: Survey topics included nonclinical approaches to address proarrhythmia issues, conduct of in silico studies, in vitro ion channel testing methods used, drugs used as positive controls during the conduct of cardiac ion channel studies, types of arrhythmias observed in non-clinical studies and use of the anticipated CiPA ion channel assay., Results: In silico studies were used to evaluate effects on ventricular action potentials by only 15% of responders. In vitro assays were used mostly to assess QT prolongation (95%), cardiac Ca
2+ and Na+ channel blockade (82%) and QT shortening or QRS prolongation (53%). For de-risking of candidate drugs for proarrhythmia, those assays most relevant to CiPA including cell lines stably expressing ion channels used to determine potency of drug block were most frequently used (89%) and human stem cell-derived or induced pluripotent stem cell cardiomyocytes (46%). Those in vivo assays related to general proarrhythmia derisking include ECG recording using implanted telemetry technology (88%), jacketed external telemetry (62%) and anesthetized animal models (53%). While the CiPA initiative was supported by 92% of responders, there may be some disconnect between current practice and future expectations, as explained., Discussion: Proarrhythmia liability assessment in drug development presently includes study types consistent with CiPA. It is anticipated that CiPA will develop into a workable solution to the concern that proarrhythmia liability testing remains suboptimal., (Copyright © 2017 The Authors. Published by Elsevier Inc. All rights reserved.)- Published
- 2017
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16. A New Perspective in the Field of Cardiac Safety Testing through the Comprehensive In Vitro Proarrhythmia Assay Paradigm.
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Fermini B, Hancox JC, Abi-Gerges N, Bridgland-Taylor M, Chaudhary KW, Colatsky T, Correll K, Crumb W, Damiano B, Erdemli G, Gintant G, Imredy J, Koerner J, Kramer J, Levesque P, Li Z, Lindqvist A, Obejero-Paz CA, Rampe D, Sawada K, Strauss DG, and Vandenberg JI
- Subjects
- Animals, Humans, Long QT Syndrome chemically induced, Long QT Syndrome diagnosis, Torsades de Pointes chemically induced, Torsades de Pointes diagnosis, Arrhythmias, Cardiac chemically induced, Arrhythmias, Cardiac diagnosis, Drug-Related Side Effects and Adverse Reactions diagnosis, Drug-Related Side Effects and Adverse Reactions etiology, Heart drug effects
- Abstract
For the past decade, cardiac safety screening to evaluate the propensity of drugs to produce QT interval prolongation and Torsades de Pointes (TdP) arrhythmia has been conducted according to ICH S7B and ICH E14 guidelines. Central to the existing approach are hERG channel assays and in vivo QT measurements. Although effective, the present paradigm carries a risk of unnecessary compound attrition and high cost, especially when considering costly thorough QT (TQT) studies conducted later in drug development. The C: omprehensive I: n Vitro P: roarrhythmia A: ssay (CiPA) initiative is a public-private collaboration with the aim of updating the existing cardiac safety testing paradigm to better evaluate arrhythmia risk and remove the need for TQT studies. It is hoped that CiPA will produce a standardized ion channel assay approach, incorporating defined tests against major cardiac ion channels, the results of which then inform evaluation of proarrhythmic actions in silico, using human ventricular action potential reconstructions. Results are then to be confirmed using human (stem cell-derived) cardiomyocytes. This perspective article reviews the rationale, progress of, and challenges for the CiPA initiative, if this new paradigm is to replace existing practice and, in time, lead to improved and widely accepted cardiac safety testing guidelines., (© 2015 Society for Laboratory Automation and Screening.)
- Published
- 2016
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17. The Diplomate in Safety Pharmacology (DSP) certification scheme.
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Authier S, Curtis MJ, Soloviev M, Redfern WS, Kallman MJ, Hamlin RL, Leishman DJ, Valentin JP, Koerner JE, Vargas HM, Botchway A, Correll K, and Pugsley MK
- Subjects
- Animals, Drug Industry standards, Drug-Related Side Effects and Adverse Reactions, Humans, Societies, Scientific organization & administration, Certification, Pharmacology standards, Professional Competence
- Abstract
As with other professional disciplines there is a growing need from within industry as well as global regulatory authorities for implementation of a certification process in order to assure that appropriate expertise is developed and quality standards are identified for professionals involved in the practice of Safety Pharmacology (SP). In order to meet this need, the Safety Pharmacology Society (SPS) has developed the Diplomate in Safety Pharmacology (DSP) certification process. There are many benefits to certification including authentication of the discipline within the overall pharmaceutical community and with regulatory authorities. It also encourages participation in SPS activities by other professionals (toxicologists, clinicians, academics) who wish to broaden their professional expertise. It provides an opportunity for candidates to strengthen their fundamental scientific knowledge, and stimulates the sharing of data, methods and model development in the form of publications and presentations on relevant topics in SP. Accreditation in SP occurs after candidates successfully complete a written certification examination conducted at the annual SPS meeting. The DSP exam consists primarily of material pertinent to the conduct of SP vital function core battery studies (i.e., cardiovascular, respiratory and central nervous systems), supplemental SP studies (i.e., renal/urinary, gastrointestinal, immunology, and hematology), Regulatory Guidelines (ICH Guidelines) as well as relevant cross-functional knowledge (e.g., physiology, pharmacology, toxicology, biochemistry, pathology, pharmacokinetics, dosing formulation, analytical methods, and statistics). Maintenance of the DSP certification results from the accrual of credits which are gained from a range of educational and scientific contributions. Eligibility requirements include a combination of at least a bachelor degree in science and two years of relevant professional SP experience and one poster presentation on a SP topic as first author at a recognized major scientific meeting., (Copyright © 2015 Elsevier Inc. All rights reserved.)
- Published
- 2015
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18. Influenza induces IL-8 and GM-CSF secretion by human alveolar epithelial cells through HGF/c-Met and TGF-α/EGFR signaling.
- Author
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Ito Y, Correll K, Zemans RL, Leslie CC, Murphy RC, and Mason RJ
- Subjects
- Alveolar Epithelial Cells virology, Cells, Cultured, Coculture Techniques, Dinoprostone metabolism, ErbB Receptors metabolism, Hepatocyte Growth Factor metabolism, Humans, Proto-Oncogene Proteins c-met metabolism, Pulmonary Alveoli pathology, Signal Transduction, Transforming Growth Factor alpha metabolism, Alveolar Epithelial Cells metabolism, Granulocyte-Macrophage Colony-Stimulating Factor metabolism, Influenza A virus immunology, Influenza, Human immunology, Interleukin-8 metabolism
- Abstract
The most severe complication of influenza is viral pneumonia, which can lead to the acute respiratory distress syndrome. Alveolar epithelial cells (AECs) are the first cells that influenza virus encounters upon entering the alveolus. Infected epithelial cells produce cytokines that attract and activate neutrophils and macrophages, which in turn induce damage to the epithelial-endothelial barrier. Hepatocyte growth factor (HGF)/c-Met and transforming growth factor-α (TGF-α)/epidermal growth factor receptor (EGFR) are well known to regulate repair of damaged alveolar epithelium by stimulating cell migration and proliferation. Recently, TGF-α/EGFR signaling has also been shown to regulate innate immune responses in bronchial epithelial cells. However, little is known about whether HGF/c-Met signaling alters the innate immune responses and whether the innate immune responses in AECs are regulated by HGF/c-Met and TGF-α/EGFR. We hypothesized that HGF/c-Met and TGF-α/EGFR would regulate innate immune responses to influenza A virus infection in human AECs. We found that recombinant human HGF (rhHGF) and rhTGF-α stimulated primary human AECs to secrete IL-8 and granulocyte macrophage colony-stimulating factor (GM-CSF) strongly and IL-6 and monocyte chemotactic protein 1 moderately. Influenza infection stimulated the secretion of IL-8 and GM-CSF by AECs plated on rat-tail collagen through EGFR activation likely by TGF-α released from AECs and through c-Met activated by HGF secreted from lung fibroblasts. HGF secretion by fibroblasts was stimulated by AEC production of prostaglandin E2 during influenza infection. We conclude that HGF/c-Met and TGF-α/EGFR signaling enhances the innate immune responses by human AECs during influenza infections., (Copyright © 2015 the American Physiological Society.)
- Published
- 2015
- Full Text
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19. Stanniocalcin-1 is induced by hypoxia inducible factor in rat alveolar epithelial cells.
- Author
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Ito Y, Zemans R, Correll K, Yang IV, Ahmad A, Gao B, and Mason RJ
- Subjects
- Animals, Cells, Cultured, Epithelial Cells cytology, Gene Expression Regulation physiology, Male, Pulmonary Alveoli cytology, Rats, Rats, Sprague-Dawley, Up-Regulation physiology, Cell Hypoxia physiology, Epithelial Cells metabolism, Glycoproteins metabolism, Hypoxia-Inducible Factor 1 metabolism, Pulmonary Alveoli metabolism
- Abstract
Alveolar type II (ATII) cells remain differentiated and express surfactant proteins when cultured at an air-liquid (A/L) interface. When cultured under submerged conditions, ATII cells dedifferentiate and change their gene expression profile. We have previously shown that gene expression under submerged conditions is regulated by hypoxia inducible factor (HIF) signaling due to focal hypoxia resulting from ATII cell metabolism. Herein, we sought to further define gene expression changes in ATII cells cultured under submerged conditions. We performed a genome wide microarray on RNA extracted from rat ATII cells cultured under submerged conditions for 24-48h after switching from an A/L interface. We found significant alterations in gene expression, including upregulation of the HIF target genes stanniocalcin-1 (STC1), tyrosine hydroxylase (Th), enolase (Eno) 2, and matrix metalloproteinase (MMP) 13, and we verified upregulation of these genes by RT-PCR. Because STC1, a highly evolutionarily conserved glycoprotein with anti-inflammatory, anti-apoptotic, anti-oxidant, and wound healing properties, is widely expressed in the lung, we further explored the potential functions of STC1 in the alveolar epithelium. We found that STC1 was induced by hypoxia and HIF in rat ATII cells, and this induction occurred rapidly and reversibly. We also showed that recombinant human STC1 (rhSTC1) enhanced cell motility with extended lamellipodia formation in alveolar epithelial cell (AEC) monolayers but did not inhibit the oxidative damage induced by LPS. We also confirmed that STC1 was upregulated by hypoxia and HIF in human lung epithelial cells. In this study, we have found that several HIF target genes including STC1 are upregulated in AECs by a submerged condition, that STC1 is regulated by hypoxia and HIF, that this regulation is rapidly and reversibly, and that STC1 enhances wound healing moderately in AEC monolayers. However, STC1 did not inhibit oxidative damage in rat AECs stimulated by LPS in vitro. Therefore, alterations in gene expression by ATII cells under submerged conditions including STC1 were largely induced by hypoxia and HIF, which may be relevant to our understanding of the pathogenesis of various lung diseases in which the alveolar epithelium is exposed to relative hypoxia., (Copyright © 2014 The Authors. Published by Elsevier Inc. All rights reserved.)
- Published
- 2014
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20. Lung fibroblasts accelerate wound closure in human alveolar epithelial cells through hepatocyte growth factor/c-Met signaling.
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Ito Y, Correll K, Schiel JA, Finigan JH, Prekeris R, and Mason RJ
- Subjects
- Adenosine Triphosphate analogs & derivatives, Adenosine Triphosphate pharmacology, Cell Movement, Cells, Cultured, Epithelial Cells cytology, Epithelial Cells pathology, Fibroblasts metabolism, Humans, Interleukin-1alpha pharmacology, Interleukin-1beta pharmacology, Pseudopodia physiology, Signal Transduction, Fibroblasts cytology, Hepatocyte Growth Factor metabolism, Proto-Oncogene Proteins c-met metabolism, Pulmonary Alveoli cytology, Wound Healing physiology
- Abstract
There are 190,600 cases of acute lung injury/acute respiratory distress syndrome (ALI/ARDS) each year in the United States, and the incidence and mortality of ALI/ARDS increase dramatically with age. Patients with ALI/ARDS have alveolar epithelial injury, which may be worsened by high-pressure mechanical ventilation. Alveolar type II (ATII) cells are the progenitor cells for the alveolar epithelium and are required to reestablish the alveolar epithelium during the recovery process from ALI/ARDS. Lung fibroblasts (FBs) migrate and proliferate early after lung injury and likely are an important source of growth factors for epithelial repair. However, how lung FBs affect epithelial wound healing in the human adult lung has not been investigated in detail. Hepatocyte growth factor (HGF) is known to be released mainly from FBs and to stimulate both migration and proliferation of primary rat ATII cells. HGF is also increased in lung tissue, bronchoalveolar lavage fluid, and serum in patients with ALI/ARDS. Therefore, we hypothesized that HGF secreted by FBs would enhance wound closure in alveolar epithelial cells (AECs). Wound closure was measured using a scratch wound-healing assay in primary human AEC monolayers and in a coculture system with FBs. We found that wound closure was accelerated by FBs mainly through HGF/c-Met signaling. HGF also restored impaired wound healing in AECs from the elderly subjects and after exposure to cyclic stretch. We conclude that HGF is the critical factor released from FBs to close wounds in human AEC monolayers and suggest that HGF is a potential strategy for hastening alveolar repair in patients with ALI/ARDS., (Copyright © 2014 the American Physiological Society.)
- Published
- 2014
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