39 results on '"Zafra C"'
Search Results
2. Practical Methodology for Characterizing Unconventional Plays using Conventional Logs, Cores and Cuttings Analysis: A Case Study
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Criollo, D., primary, Fam, M., additional, Hernández, Y.F., additional, López, A.M., additional, and Zafra, C., additional
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- 2022
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3. Exploring Ubiquinone Biosynthesis Inhibition as a Strategy for Improving Atovaquone Efficacy in Malaria
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Verdaguer, I. B., primary, Crispim, M., additional, Zafra, C. A., additional, Sussmann, R. A. C., additional, Buriticá, N. L., additional, Melo, H. R., additional, Azevedo, M. F., additional, Almeida, F. G., additional, Kimura, E. A., additional, and Katzin, A. M., additional
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- 2021
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4. In-vitro evaluation of the adhesion to polypropylene sutures of non-pigmented, rapidly growing mycobacteria
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Zamora, N., Esteban, J., Kinnari, T.J., Celdrán, A., Granizo, J.J., and Zafra, C.
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- 2007
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5. MAMI: a birth cohort focused on maternal-infant microbiota during early life
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Garcia-Mantrana I, Alcantara C, Selma-Royo M, Boix-Amoros A, Dzidic M, Gimeno-Alcaniz J, Ubeda-Sansano I, Sorribes-Monrabal I, Escuriet R, Gil-Raga F, Parra-Llorca A, Martinez-Costa C, Collado M, Bauerl C, Villoldo E, Zafra C, Olivares L, Perez-Martinez G, Mira A, Ferrer M, Santamaria J, Ahicart A, Vento M, Gormaz M, Cernada M, Bertua-Rios B, Padilla B, Crehua-Gaudiza E, Pereto-Moll A, Garcia A, Rico M, Martinez N, Segarra I, Soriano J, Blesa-Baviera L, Vidal A, Hornos L, del Moral T, Cano P, Delgado C, Atero A, and MAMI Team
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Meconium ,Breast milk ,Antibiotics ,Microbiota ,Birth ,Lactation ,Neonates ,Growth ,Early nutrition ,Cohort study ,Diet - Abstract
BackgroundEarly microbial colonization is a relevant aspect in human health. Altered microbial colonization patterns have been linked to an increased risk of non-communicable diseases (NCDs). Advances in understanding host-microbe interactions highlight the pivotal role of maternal microbiota on infant health programming. This birth cohort is aimed to characterize the maternal microbes transferred to neonates during the first 1000days of life, as well as to identify the potential host and environmental factors, such as gestational age, mode of delivery, maternal/infant diet, and exposure to antibiotics, which affect early microbial colonization.MethodsMAMI is a prospective mother-infant birth cohort in the Spanish-Mediterranean area. Mothers were enrolled at the end of pregnancy and families were follow-up during the first years of life. Maternal-infant biological samples were collected at several time points from birth to 24months of life. Clinical and anthropometric characteristics and dietary information is available. Specific qPCR and 16S rRNA gene sequencing as well as short chain fatty acid (SCFAs) profile would be obtained. Multivariable models will be used to identy associations between microbiota and clinical and anthropometric data controlling for confounders.MAMI would contribute to a better understanding of the interaction between diet, microbiota and host response in early life health programming, enabling new applications in the field of personalized nutrition and medicine.Trial registrationThe study is registered on the ClinicalTrial.gov platform NCT03552939. (June 12, 2018).
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- 2019
6. A multi-center, randomized, parallel-group study to compare the efficacy of enhanced cognitive behavior therapy (CBT-E) with treatment as usual (TAU) for anorexia nervosa: study protocol
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Nobuhiro Nohara, Yukari Yamanaka, Mikiko Matsuoka, Tadahiro Yamazaki, Keisuke Kawai, Shu Takakura, Nobuyuki Sudo, Tetsuya Ando, Yutaka Matsuyama, Susan Byrne, Riccardo Dalle Grave, Zafra Cooper, and Kazuhiro Yoshiuchi
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Adolescent ,Adult ,Anorexia nervosa ,Feeding and eating disorders ,Psychological treatments ,Randomized controlled trial ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
Abstract Background The superiority of Enhanced Cognitive Behavior Therapy (CBT-E) with regard to weight gain and improvement of psychopathology of eating disorders for patients with anorexia nervosa (AN) over other psychotherapies and treatment as usual (TAU) has not been demonstrated in randomized controlled trials (RCTs). However, a previous RCT showed that patients with AN whose baseline body mass index (BMI) was less than 17.5 kg/m2 gained more weight when treated with CBT-E than with other psychotherapies. The aim of the study is to compare the efficacy of CBT-E and TAU for patients with AN. It was hypothesized that CBT-E would be superior to TAU, at least in terms of weight gain, as most patients with AN are likely to have a BMI lower than 17.5 kg/m2. Methods/design A randomized parallel-group multicenter trial will be conducted in three teaching hospitals in Japan between January 2023 and March 2026. Patients with DSM-5 AN, aged 16 years and older, with a BMI equal to or above 14.0 and below 18.5 will be eligible to participate. 56 patients will be randomly and evenly assigned to two intervention groups (CBT-E and TAU). Those assigned to CBT-E will be offered 25–40 sessions in accordance with their initial BMI. Patients assigned to TAU will have at least one session every 2 weeks, with the number of sessions and treatment period not fixed in advance. The primary outcome is BMI at 40 weeks after treatment initiation. The secondary outcomes are the results from the Japanese version of the Eating Disorder Examination Questionnaire and Clinical Impairment Assessment questionnaire to measure eating disorder psychopathology and psychological impairment. The follow-up assessment will be performed 6 months after the 40-week assessment. Discussion This multi-center randomized controlled study will probably evaluate the efficacy of CBT-E compared with TAU for patients with more severe AN than in previous studies since Japanese patients are likely to have a lower BMI than those in Western countries. While it may be difficult to generalize the results of a study conducted in Japan, it would be valuable to clarify the efficacy of CBT-E as a treatment package. Trial registration UMIN, UMIN000048847. Registered 12 Sep 2022.
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- 2023
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7. Role of GABAA receptors in the organization of brain and behavioural sex differences
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María Angeles Pérez Izquierdo, Rodriguez-Zafra C, Carmen Pérez-Laso, Esperanza Ortega, Antonio Guillamón, Santiago Segovia, and del Cerro Mc
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Male ,Agonist ,Olfactory system ,medicine.medical_specialty ,medicine.drug_class ,Agonist-antagonist ,Central nervous system ,chemistry.chemical_compound ,Internal medicine ,medicine ,Animals ,Rats, Wistar ,Neurotransmitter ,Receptor ,Sex Characteristics ,Behavior, Animal ,GABAA receptor ,General Neuroscience ,Brain ,Receptors, GABA-A ,Rats ,medicine.anatomical_structure ,Endocrinology ,nervous system ,chemistry ,Female ,Psychology ,Picrotoxin - Abstract
SEX differences in GABA neurotransmitter have been described. We have studied the involvement of the GABA A receptor in sex differences in the brain and reproductive behaviour. Neonatal administration of the GABA A agonist diazepam to male rats facilitated the induction of maternal behaviour in adults, while the antagonist picrotoxin disrupted it in females. Sex differences in the accessory olfactory bulb were also reversed, but gonadal function remained unaltered in both sexes. This suggests that neonatal changes in neuronal membrane permeability to Cl- ions may play a role in the organization of sex differences. Our study constitutes a new model for understanding the early neurobiological organization of sex differences.
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- 1996
8. VALOR NUTRITIVO DEL ENSILAJE DE HIERBA EN LAS EXPLOTACIONES GANADERAS DE GALICIA
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Flores Calvete, G., Amor Fernández, J., Resch Zafra, C., and González-Arráez, A.
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En este artículo se revisa información disponible sobre el ensilaje de hierba en Galicia, que es producto de las investigaciones realizadas, sobre todo en los últimos quince años del siglo pasado, tanto en centros de investigación como en las propias explotaciones ganaderas. El artículo se estructura en tres apartados claramente diferenciados: 1) Importancia del ensilaje en las explotaciones gallegas de vacuno, 2) Calidad del ensilaje y productividad animal, y 3) Calidad del ensilaje en las explotaciones gallegas. 1) Importancia del ensilaje en las explotaciones gallegas de vacuno. Las explotaciones gallegas de leche de vacuno ensilan unas 250 000 ha anuales de hierba de pradera, sumando primer y segundo corte, lo que representa el 70% del total de hierba ensilada en las ocho comunidades autónomas españolas con cierta relevancia en producción de leche de vacuno en España, si se excluyen Navarra y Euskadi. Estas explotaciones dependen del ensilado por un período anual de 4 a más de 6 meses, entre verano e invierno. La técnica de ensilado reemplazó casi totalmente a la tradicional henificación debido, entre otros factores, a la imposibilidad de realizar un secado natural del forraje en el campo en primavera, cuando la hierba presenta un valor nutritivo adecuado. En la actualidad sólo se hace heno en las explotaciones marginales o en los cortes tardíos de las explotaciones mejor dimensionadas. La mejora de la calidad del ensilaje es un elemento clave en la reducción de los costes de producción en las explotaciones lecheras. 2) Calidad del ensilaje y productividad animal. En este apartado se revisa brevemente la información local e internacional sobre las relaciones entre digestibilidad y productividad animal; madurez de la hierba y digestibilidad, calidad de conservación y productividad animal, y sobre el nivel de pérdidas en el ensilaje y el poder contaminante de los efluentes. La disminución media diaria de la digestibilidad de la materia orgánica (DMO) en praderas monofitas de gramíneas y de mezclas de gramíneas con trébol blanco se cuantificó entre 0,25 y 0,50 puntos de porcentaje por día en el entorno del principio de espigado, en ensayos realizados en el CIAM. Terneros alimentados con forrajes ensilados bien conservados, con una DMS próxima al 70%, tuvieron crecimientos superiores a 1000 g/cabeza/día. Por el contrario, forrajes mal conservados, con la misma DMS, sólo permitieron crecimientos de 830 g/cabeza/día. En ensilajes realizados en condiciones normales se asumen pérdidas totales de materia seca entre 20 y 30%. En el caso de que la lluvia sea intensa sobre la hierba segada para presecar, las pérdidas totales pueden llegar al 40-50%, pudiendo llegar incluso a la pérdida total de la cosecha. Por eso, y a pesar de que el presecado es una herramienta mucho más potente que el uso de aditivos para conseguir una buena conservación, se recomienda el ensilado directo, sin presecado, y la utilización de un aditivo eficaz siempre que sea de temer la presencia de lluvia. 3) Calidad del ensilaje en las explotaciones gallegas. En un estudio realizado en el período 1991-1996 se analizaron cerca de cuatro mil ensilajes de explotaciones de leche de vacuno, de lo que se concluye que la calidad fermentativa fue muy dependiente de la climatología durante el período de recolección de la hierba para ensilar. El porcentaje de ensilajes afectados por la lluvia osciló entre en 44,1% en 1993 y el 13,5% en 1995, años de peor y mejor calidad fermentativa media, respectivamente. Los ensilajes presecados mostraron una calidad fermentativa y un valor nutritivo superior a los no presecados. La aplicación de aditivos no mejoró la conservación de los ensilajes en la medida de lo esperado porque la técnica de aplicación fue incorrecta y, en muchos casos, se aplicaron dosis inferiores a las recomendadas. Se termina el artículo con un diagrama que puede ayudar a los ganaderos y a sus asesores a la toma de decisiones en puntos críticos del proceso de ensilado.
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- 2011
9. Effectiveness of enhanced cognitive behavior therapy for bulimia nervosa in Japan: a randomized controlled trial protocol
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Chisato Ohara, Atsushi Sekiguchi, Shu Takakura, Yuka Endo, Naho Tamura, Hiroe Kikuchi, Kazushi Maruo, Norio Sugawara, Kenji Hatano, Hitomi Kawanishi, Misako Funaba, Ayako Sugawara, Nobuhiro Nohara, Keisuke Kawai, Shin Fukudo, Nobuyuki Sudo, Zafra Cooper, Kazuhiro Yoshiuchi, and Tetsuya Ando
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Eating disorder ,Bulimia nervosa ,Cognitive behavior therapy ,Randomized controlled trial ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
Abstract Background The effectiveness of psychotherapeutic interventions for eating disorders (EDs) is widely studied in Europe, North America, and Australia/New Zealand. However, few controlled studies and no randomized controlled trials (RCTs) have been conducted in Japan despite the relatively high prevalence of EDs in the Japanese population. The aim of this study is to evaluate the effect of enhanced cognitive behavior therapy (CBT-E), an evidence-supported ED-focused form of cognitive behavior therapy (CBT), for the treatment of bulimia nervosa (BN) in Japan. Methods/design This multicenter RCT will compare CBT-E with treatment as usual (TAU), which is widely used in Japan. A group of 140 adult outpatients with a Diagnostic and Statistical Manual of Mental Disorders Fifth Edition (DSM-5) diagnosis of BN, ≥18 years of age, a body mass index (BMI) > 17.5 and
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- 2020
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10. PARTICLE SIZE DISTRIBUTION OF ACCUMULATED SEDIMENTS ON AN URBAN ROAD IN RAINY WEATHER
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Zafra, C. A., primary, Temprano, J., additional, and Tejero, I., additional
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- 2008
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11. Cognitive–behavioural therapy for a variety of conditions: an overview of systematic reviews and panoramic meta-analysis
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Beth Fordham, Thavapriya Sugavanam, Katherine Edwards, Karla Hemming, Jeremy Howick, Bethan Copsey, Hopin Lee, Milla Kaidesoja, Shona Kirtley, Sally Hopewell, Roshan das Nair, Robert Howard, Paul Stallard, Julia Hamer-Hunt, Zafra Cooper, and Sarah E Lamb
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cognitive–behavioural therapy ,quality of life ,international classification of diseases ,data analysis ,Medical technology ,R855-855.5 - Abstract
Background: Cognitive–behavioural therapy aims to increase quality of life by changing cognitive and behavioural factors that maintain problematic symptoms. A previous overview of cognitive–behavioural therapy systematic reviews suggested that cognitive–behavioural therapy was effective for many conditions. However, few of the included reviews synthesised randomised controlled trials. Objectives: This project was undertaken to map the quality and gaps in the cognitive–behavioural therapy systematic review of randomised controlled trial evidence base. Panoramic meta-analyses were also conducted to identify any across-condition general effects of cognitive–behavioural therapy. Data sources: The overview was designed with cognitive–behavioural therapy patients, clinicians and researchers. The Cochrane Library, MEDLINE, EMBASE, PsycINFO, Cumulative Index to Nursing and Allied Health Literature, Child Development & Adolescent Studies, Database of Abstracts of Reviews of Effects and OpenGrey databases were searched from 1992 to January 2019. Review methods: Study inclusion criteria were as follows: (1) fulfil the Centre for Reviews and Dissemination criteria; (2) intervention reported as cognitive–behavioural therapy or including one cognitive and one behavioural element; (3) include a synthesis of cognitive–behavioural therapy trials; (4) include either health-related quality of life, depression, anxiety or pain outcome; and (5) available in English. Review quality was assessed with A MeaSurement Tool to Assess systematic Reviews (AMSTAR)-2. Reviews were quality assessed and data were extracted in duplicate by two independent researchers, and then mapped according to condition, population, context and quality. The effects from high-quality reviews were pooled within condition groups, using a random-effect panoramic meta-analysis. If the across-condition heterogeneity was I2
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- 2021
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12. Simvastatin ammeliorates the increased hepatic vascular tone in patients with cirrhosis
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Zafra, C., primary, Abraldes, J.G., additional, Cortez, C., additional, Berzigotti, A., additional, Tarantino, I., additional, Garcia-Pagan, J.C., additional, and Bosch, J., additional
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- 2003
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13. Antiulcer and Antidiarrhoeic Effect of Baccharis teindalensis
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Vidari, G., primary, Finzi, P. Vita, additional, Zarzuelo, A., additional, Gálvez, J., additional, Zafra, C., additional, Chiriboga, X., additional, Berenguer, B., additional, Casa, C. La, additional, de la Lastra, C. Alarcón, additional, Motilva, V., additional, and Martín, M.J., additional
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- 2003
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14. Distribution of the concentration of heavy metals associated with the sediment particles accumulated on road surfaces.
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Zafra, C. A., Temprano, J., and Tejero, I.
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HEAVY metals ,SEDIMENTS ,PAVEMENTS ,PARTICLE size distribution ,RUNOFF - Abstract
The heavy metal pollution caused by road run-off water constitutes a problem in urban areas. The metallic load associated with road sediment must be determined in order to study its impact in drainage systems and receiving waters, and to perfect the design of prevention systems. This paper presents data regarding the sediment collected on road surfaces in the city of Torrelavega (northern Spain) during a period of 65 days (132 samples). Two sample types were collected: vacuum-dried samples and those swept up following vacuuming. The sediment loading (g m-2), particle size distribution (63-2800 µm) and heavy metal concentrations were determined. The data showed that the concentration of heavy metals tends to increase with the reduction in the particle diameter (exponential tendency). The concentrations of Pb, Zn, Cu, Cr, Ni, Cd, Fe, Mn and Co in the size fraction <63 µm were 350, 630, 124, 57, 56, 38, 3231, 374 and 51 mg kg-1, respectively (average traffic density: 3800 vehicles day-1). By increasing the residence time of the sediment, the concentration increases, whereas the ratio of the concentration between the different size fractions decreases. The concentration across the road diminishes when the distance between the roadway and the sampling siteincreases; when the distance increases, the ratio between size fractions for heavy metal concentrations increases. Finally, the main sources of heavy metals are the particles detached by braking (brake pads) and tyre wear (rubber), and are associated with particle sizes <125 µm. [ABSTRACT FROM AUTHOR]
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- 2011
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15. BIOINGENIERÍA Y SUELO: ABUNDANCIA MICROBIOLÓGICA, pH Y CONDUCTIVIDAD ELÉCTRICA BAJO TRES ESTRATOS DE EROSIÓN.
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Romero, M. P., Santamaría, D. M., and Zafra, C. A.
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SOIL science ,BIOENGINEERING ,SOIL microbiology ,ELECTRIC conductivity ,PH effect ,EROSION - Abstract
Copyright of Revista Umbral Científico is the property of Universidad Manuela Beltran and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2009
16. Effect of Microwaves on the Activity of Murine Macrophages in vitro.
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Zafra, C., Peña, J., and de la Fuente, M.
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- 1988
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17. Effect of Fiblaferon-L on the Human Immune System.
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Zafra, C., de la Fuente, M., Gaytan, F., Solana, R., and Pena, J.
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- 1984
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18. Simvastatin enhances hepatic nitric oxide production and decreases the hepatic vascular tone in patients with cirrhosis
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Zafra, C., Abraldes, J.G., Turnes, J., Berzigotti, A., Fernandez, M., Garci@?a-Pagan, J.C., Rodes, J., and Bosch, J.
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Background & Aims: In cirrhosis, an insufficient release of nitric oxide contributes to increased hepatic resistance and portal pressure and enhances the postprandial increase in portal pressure. We hypothesized that simvastatin, which enhances Akt-dependent endothelial nitric oxide synthase phosphorylation, may increase hepatic nitric oxide release and decrease hepatic resistance in patients with cirrhosis and portal hypertension. Methods: In protocol 1, 13 patients had measurements of the hepatic venous pressure gradient, hepatic blood flow, mean arterial pressure, cardiac output, and nitric oxide products before and 30 and 60 minutes after 40 mg of simvastatin. In protocol 2, 17 patients were randomized to receive placebo or simvastatin (40 mg) 12 hours and 1 hour before the study. After baseline measurements of the hepatic venous pressure gradient, hepatic blood flow, and nitric oxide products, a standard liquid meal was given, and measurements were repeated at 15, 30, and 45 minutes. Results: In protocol 1, acute simvastatin did not modify the hepatic venous pressure gradient but increased the hepatic blood flow (21% +/- 13% at 30 minutes; P = 0.01) and decreased hepatic sinusoidal resistance by 14% +/- 11% (P = 0.04). Nitric oxide product levels significantly increased in hepatic venous blood (from 31.4 +/- 12.3 nmol . mL^-^1 to 35.8 +/- 10.7 nmol . mL^-^1; P = 0.04), but not in peripheral blood. Systemic hemodynamics were not modified. In protocol 2, simvastatin pretreatment significantly attenuated the postprandial increase in hepatic venous pressure gradient (mean peak increase, 10% +/- 9% vs. 21% +/- 6% in placebo; P = 0.01). Hepatic blood flow increased similarly in the 2 groups. Hepatic nitric oxide products increased in the simvastatin group but not in the placebo group. Conclusions: Simvastatin administration increases the hepatosplanchnic output of nitric oxide products and decreases hepatic resistance in patients with cirrhosis.
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- 2004
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19. Effect of a new synthetic C-nucleoside (EDTO) on cell proliferation
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de la Fuente M, del Mar Fernández M, Zafra C, Rafael Solana, and Peña J
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Mice ,T-Lymphocytes ,Animals ,Humans ,Nucleosides ,In Vitro Techniques ,Indolequinones ,Phytohemagglutinins ,Carcinoma, Ehrlich Tumor ,Cell Division ,Cells, Cultured ,Thymidine - Abstract
The growth of Ehrlich ascite tumour cells obtained from NMRI mice and the proliferative response of T-lymphocytes from human peripheral blood in the presence of a mitogen: phytohemagglutinin (PHA) were studied in order to see what effect 2-(alpha and beta-D-erythrophuranosyl)-6,6-dimethyl-4,5,6,7-tetrahydroindol+ ++-4-one (a new synthetic C-nucleoside) had on cell proliferation. The uptake of 3H-thymidine was used as an index of cellular growth. The results show that although this C-nucleoside did not significantly alter the growth of the tumour cells, it did significantly inhibit the proliferation of T-lymphocytes.
- Published
- 1984
20. The Effectiveness of Cognitive Behavioural Treatment for Non-Specific Low Back Pain: A Systematic Review and Meta-Analysis.
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Helen Richmond, Amanda M Hall, Bethan Copsey, Zara Hansen, Esther Williamson, Nicolette Hoxey-Thomas, Zafra Cooper, and Sarah E Lamb
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Medicine ,Science - Abstract
To assess whether cognitive behavioural (CB) approaches improve disability, pain, quality of life and/or work disability for patients with low back pain (LBP) of any duration and of any age.Nine databases were searched for randomised controlled trials (RCTs) from inception to November 2014. Two independent reviewers rated trial quality and extracted trial data. Standardised mean differences (SMD) and 95% confidence intervals were calculated for individual trials. Pooled effect sizes were calculated using a random-effects model for two contrasts: CB versus no treatment (including wait-list and usual care (WL/UC)), and CB versus other guideline-based active treatment (GAT).The review included 23 studies with a total of 3359 participants. Of these, the majority studied patients with persistent LBP (>6 weeks; n=20). At long term follow-up, the pooled SMD for the WL/UC comparison was -0.19 (-0.38, 0.01) for disability, and -0.23 (-0.43, -0.04) for pain, in favour of CB. For the GAT comparison, at long term the pooled SMD was -0.83 (-1.46, -0.19) for disability and -0.48 (-0.93, -0.04) for pain, in favour of CB. While trials varied considerably in methodological quality, and in intervention factors such as provider, mode of delivery, dose, duration, and pragmatism, there were several examples of lower intensity, low cost interventions that were effective.CB interventions yield long-term improvements in pain, disability and quality of life in comparison to no treatment and other guideline-based active treatments for patients with LBP of any duration and of any age.PROSPERO protocol registration number: CRD42014010536.
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- 2015
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21. Kinetics and characteristics of murine macrophage-lymphocyte interaction in presence of PHA: appearance of multinucleated giant cells in vitro
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Gaytan, F., Zafra, C., La Fuente, M., Rafael Solana, Luque, J., and Peña, J.
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Mice ,Rosette Formation ,Time Factors ,Phagocytosis ,Macrophages ,Animals ,Lymphocytes ,Phytohemagglutinins ,Lymphocyte Activation - Abstract
The appearance of cellular associations between macrophages and lymphocytes--which we have denominated macrophage-lymphocyte rosettes--and their kinetic formation in the presence of phytohemagglutinin (PHA) have been studied in B10 A (4R) mice. The greatest number of macrophage-lymphocyte rosettes was found from 6 to 12 hours after incubation with PHA. During this time, 42.38 +/- 10.70 of the total number of macrophages had lymphocytes attached to their membranes. This percentage decreased to 17.33 +/- 2.07% after 24 hours. The activation of macrophages after PHA treatment was tested by the phagocytic capacity of these cells. This activity increased significantly 24 hours after incubation. In our assay, an increase in the appearance of multinucleated giant cells when compared to controls was also observed. When the macrophages were lymphocyte depleted, the appearance of the multinucleated giant cells was significantly lower. The kinetics for these formations are also discussed.
22. [Effect of a new synthetic cyclic-nucleoside on cell proliferation]
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Mm, Fernández, de la Fuente M, Zafra C, Rafael Solana, and Peña J
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Mice ,T-Lymphocytes ,Animals ,Humans ,Antineoplastic Agents ,Nucleosides ,In Vitro Techniques ,Indolequinones ,Carcinoma, Ehrlich Tumor ,Cell Division - Abstract
The activity of a new synthetic C-nucleoside upon cell proliferation was tested using mouse Ehrlich ascites tumor cells and PHA-stimulated human blood T lymphocytes. The product did not modify the cancer cells reproduction. Contrarily, it inhibited T lymphocytes proliferation.
23. Safety assessment of protein A and derivation of a parenteral health-based exposure limit.
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Graham JC, Anand SS, Bercu J, Besenhofer L, de Zafra C, Feng Y, Fisher C, Hillegass J, Hutchinson R, Jolly R, Moudgal C, Nicholas T, Olszova D, Schmitz M, and Semmelmann F
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- Humans, Animals, Drug Contamination prevention & control, Risk Assessment, Staphylococcal Protein A chemistry
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Protein A (PA) is a bacterial cell wall component of Staphylococcus aureus whose function is to bind to Immunoglobulin G (IgG). Given its ability to bind IgG as well as its stability and resistance to harsh acidic and basic cleaning conditions, it is commonly used in the affinity chromotography purification of biotherapeutics. This use can result in levels of PA being present in a drug product and subsequent patient exposure. Interestingly, PA was previously evaluated in clinical trials as well as supporting nonclinical studies, resulting in a database that enables the derivation of a health-based exposure limit (HBEL). Given the widespread use of PA in the pharmaceutical industry, the IQ DruSafe Impurities Safety Working Group (WG) evaluated the available information with the purpose of establishing a harmonized parenteral HBEL for PA. Based on this thorough, collaborative evaluation of nonclinical and clinical data available for PA, a parenteral HBEL of 1.2 μg/kg/dose (60 μg/dose for a 50 kg individual) is expected to be health protective for patients when it is present as an impurity in a biotherapeutic., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)
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- 2024
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24. The Vedotin Antibody-Drug Conjugate Payload Drives Platform-Based Nonclinical Safety and Pharmacokinetic Profiles.
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Neff-LaFord HD, Carratt SA, Carosino C, Everds N, Cardinal KA, Duniho S, Schutten MM, Frantz C, Zuch de Zafra C, and Harstad EB
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- Animals, Rats, Humans, Brentuximab Vedotin pharmacokinetics, Male, Female, Oligopeptides pharmacokinetics, Macaca fascicularis, Immunoconjugates pharmacokinetics, Immunoconjugates adverse effects
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Nonclinical safety and pharmacokinetic data for monomethyl auristatin E (MMAE) and 14 vedotin antibody-drug conjugates (ADC) were evaluated to determine patterns of toxicity, consistency of pharmacokinetic results, and species differences between rats and monkeys. Most nonclinical toxicities were antigen-independent, common across ADCs, and included hematologic, lymphoid, and reproductive toxicity related to MMAE pharmacology. Hematologic toxicity was the dose-limiting toxicity (DLT) or predominant toxicity for the majority of vedotin ADCs in both species. Tissue expression of the targeted antigen of an ADC rarely correlated with DLT; only two ADCs had antigen-dependent skin DLTs. For two additional ADCs, antigen-dependent delivery of MMAE in the bone marrow may have exacerbated the antigen-independent hematologic DLT. The highest tolerated doses and pharmacokinetics were similar within a given species, with rats tolerating higher doses than monkeys. Studies longer than 1 month in duration detected the same or fewer toxicities than 1-month studies and had no additional findings that affected the human risk assessment. These data support opportunities to streamline ADC toxicity assessments without compromising human starting dose selection or target organ identification., (©2024 The Authors; Published by the American Association for Cancer Research.)
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- 2024
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25. [Neutrophil-to-lymphocyte ratio as a predictor of intestinal resection in incarcerated inguinal hernias].
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Perez RD, Villena MA, Zavaleta-Corvera C, Caballero-Alvarado J, Zafra C, and Pozzuoli G
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- Humans, Male, Female, Middle Aged, Aged, Retrospective Studies, Predictive Value of Tests, Lymphocyte Count, Peru, Herniorrhaphy methods, Herniorrhaphy adverse effects, Intestines surgery, ROC Curve, Hernia, Inguinal surgery, Hernia, Inguinal diagnosis, Hernia, Inguinal blood, Neutrophils, Lymphocytes, Intestinal Obstruction etiology, Intestinal Obstruction surgery, Intestinal Obstruction diagnosis, Intestinal Obstruction blood
- Abstract
Introduction: Inguinal hernia is defined as a projection of an organ through the inguinal canal. This can be incarcerated as a consequence of continuous inflammation of the hernial sac, which will prevent its return, causing damage to the venous and lymphatic return of the viscera. The neutrophil-to-lymphocyte ratio (NLR) is an easily accessible inflammatory biomarker obtained from blood cell counts. Therefore, the objective was to determine if the NLR is useful as a predictor of intestinal resection in incarcerated inguinal hernias., Material and Method: An observational, analytical, diagnostic test and retrospective study was carried out in a hospital in northern Peru from January 2013 to August 2019 in the Department of General Surgery and Emergency Surgery and Critical Care. Patients diagnosed with unilateral inguinal hernia with intestinal obstruction were included. For the relationship between the event and the exposure, it was analyzed using Chi square (χ
2 ) and T -Student. The sensitivity, specificity, positive predictive value, negative predictive value of the NLR as well as the area under the ROC curve were found to determine the predictive accuracy., Results: 161 patients with incarcerated inguinal hernia were studied: group I (20 patients with intestinal resection) and group II (141 patients without intestinal resection). The mean age in groups I and II were 69±16 and 60±17 years ( p <0.05); the frequency in males was 70% in group I and 76% in group II ( p >0.05). Intestinal obstruction and duration of incarceration >24 hours and the platelet-to-lymphocyte ratio demonstrated significant differences. With respect to NLR taking a cut-off point ≥6.5, a sensitivity of 75%, a specificity of 93.62%, a positive predictive value of 62.5% and a negative predictive value of 96.35% were observed; In addition, when analyzing with the ROC curve, a value of 5.14 was obtained as a predictor of intestinal resection with a sensitivity of 90% and a specificity of 84.4% ( p <0.001). Therefore, the NLR >5.14 predicts intestinal resection in patients with incarcerated inguinal hernias with an area under the curve of 0.92 at the Belen Hospital of Trujillo., Conclusions: The neutrophil-to-lymphocyte ratio is useful for predicting intestinal resection with a diagnostic accuracy of 92%.- Published
- 2024
- Full Text
- View/download PDF
26. Erratum to: Effect of Nordic Sensi® Chair on Behavioral and Psychological Symptoms of Dementia in Nursing Homes Residents: A Randomized Controlled Trial.
- Author
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García-Alberca JM, de la Rosa MD, Solo de Zaldívar P, Ledesma M, Oltra E, Esther G, Ocejo O, Torrecilla J, Zafra C, Sánchez-Fernández A, Mancilla T, López-Romero M, Jerez R, Santana N, Lara JP, Barbancho MÁ, and Blanco-Reina E
- Published
- 2024
- Full Text
- View/download PDF
27. An Insertion Within SIRPβ1 Shows a Dual Effect Over Alzheimer's Disease Cognitive Decline Altering the Microglial Response.
- Author
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García-Alberca JM, de Rojas I, Sanchez-Mejias E, Garrido-Martín D, Gonzalez-Palma L, Jimenez S, Pino-Angeles A, Cruz-Gamero JM, Mendoza S, Alarcón-Martín E, Muñoz-Castro C, Real LM, Tena JJ, Polvillo R, Govantes F, Lopez A, Royo-Aguado JL, Navarro V, Gonzalez I, Ruiz M, Reyes-Engel A, Gris E, Bravo MJ, Lopez-Gutierrez L, Mejias-Ortega M, De la Guía P, López de la Rica M, Ocejo O, Torrecilla J, Zafra C, Nieto MD, Urbano C, Jiménez-Sánchez R, Pareja N, Luque M, García-Peralta M, Carrillejo R, Furniet MDC, Rueda L, Sánchez-Fernández A, Mancilla T, Peña I, García-Casares N, Moreno-Grau S, Hernández I, Montrreal L, Quintela I, González-Pérez A, Calero M, Franco-Macías E, Macías J, Menéndez-González M, Frank-García A, Huerto Vilas R, Diez-Fairen M, Lage C, García-Madrona S, García-González P, Valero S, Sotolongo-Grau O, Pérez-Cordón A, Rábano A, Arias Pastor A, Pastor AB, Espinosa A, Corma-Gómez A, Martín Montes Á, Sanabria Á, Martínez Rodríguez C, Buiza-Rueda D, Rodriguez-Rodriguez E, Ortega G, Alvarez I, Rosas Allende I, Pineda JA, Rosende-Roca M, Bernal Sánchez-Arjona M, Fernández-Fuertes M, Alegret M, Roberto N, Del Ser T, Garcia-Ribas G, Sánchez-Juan P, Pastor P, Piñol-Ripoll G, Bullido MJ, Álvarez V, Mir P, Medina M, Marquié M, Sáez ME, Carracedo Á, Laplana M, Tomas-Gallardo L, Orellana A, Tárraga L, Boada M, Fibla Palazon J, Vitorica J, Ruiz A, Guigo R, Gutierrez A, and Royo JL
- Subjects
- Humans, Amyloid beta-Peptides metabolism, Microglia metabolism, Phagocytosis, Alzheimer Disease diagnostic imaging, Alzheimer Disease genetics, Cognitive Dysfunction diagnostic imaging, Cognitive Dysfunction genetics, Cognitive Dysfunction metabolism, Receptors, Cell Surface metabolism
- Abstract
Background: Microglial dysfunction plays a causative role in Alzheimer's disease (AD) pathogenesis. Here we focus on a germline insertion/deletion variant mapping SIRPβ1, a surface receptor that triggers amyloid-β(Aβ) phagocytosis via TYROBP., Objective: To analyze the impact of this copy-number variant in SIRPβ1 expression and how it affects AD molecular etiology., Methods: Copy-number variant proxy rs2209313 was evaluated in GERALD and GR@ACE longitudinal series. Hippocampal specimens of genotyped AD patients were also examined. SIRPβ1 isoform-specific phagocytosis assays were performed in HEK393T cells., Results: The insertion alters the SIRPβ1 protein isoform landscape compromising its ability to bind oligomeric Aβ and its affinity for TYROBP. SIRPβ1 Dup/Dup patients with mild cognitive impairment show an increased cerebrospinal fluid t-Tau/Aβ ratio (p = 0.018) and a higher risk to develop AD (OR = 1.678, p = 0.018). MRIs showed that Dup/Dup patients exhibited a worse initial response to AD. At the moment of diagnosis, all patients showed equivalent Mini-Mental State Examination scores. However, AD patients with the duplication had less hippocampal degeneration (p < 0.001) and fewer white matter hyperintensities. In contrast, longitudinal studies indicate that patients bearing the duplication allele show a slower cognitive decline (p = 0.013). Transcriptional analysis also shows that the SIRPβ1 duplication allele correlates with higher TREM2 expression and an increased microglial activation., Conclusions: The SIRPβ1 internal duplication has opposite effects over MCI-to-Dementia conversion risk and AD progression, affecting microglial response to Aβ. Given the pharmacological approaches focused on the TREM2-TYROBP axis, we believe that SIRPβ1 structural variant might be considered as a potential modulator of this causative pathway.
- Published
- 2024
- Full Text
- View/download PDF
28. FDA and industry collaboration: Identifying opportunities to further reduce reliance on nonhuman primates for nonclinical safety evaluations.
- Author
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Ackley D, Birkebak J, Blumel J, Bourcier T, de Zafra C, Goodwin A, Halpern W, Herzyk D, Kronenberg S, Mauthe R, Shenton J, Shuey D, and Wange RL
- Subjects
- Animals, Humans, United States, United States Food and Drug Administration, COVID-19 Vaccines, SARS-CoV-2, Primates, COVID-19 prevention & control
- Abstract
The nonhuman primate (NHP) has always been a limited resource for pharmaceutical research with ongoing efforts to conserve. This is due to their inherent biological properties, the growth in biotherapeutics and other modalities, and their use in small molecule drug development. The SARS-CoV-2 pandemic has significantly impacted the availability of NHPs due to the immediate need for NHPs to develop COVID-19 vaccines and treatments and the China NHP export ban; thus, accelerating the need to further replace, reduce and refine (3Rs) NHP use. The impact of the NHP shortage on drug development led DruSafe, BioSafe, and the United States (U.S.) Food and Drug Administration (FDA) Center for Drug Evaluation and Research (CDER) to discuss this issue at their 2021 annual meeting. This meeting identified areas to further the 3Rs in NHP use within the current nonclinical safety evaluation regulatory framework and highlighted the need to continue advancing alternative methods towards the aspirational goal to replace use of NHPs in the long term. Alignment across global health authorities is necessary for implementation of approaches that fall outside existing guidelines. This article captures the proceedings from this meeting highlighting current best practices and areas for 3Rs in NHP use., Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: David Ackley, Joanne Birkebak, Jorg Blumel, Christina deZafra, Wendy Halpern, Danuta Herzyk, Sven Kronenberg, Robert Mauthe, Jacintha Shenton and Dana Shuey are employed, respectively, by the following pharmaceutical companies and as employees may hold stock in their respective companies: Eli Lilly, Gilead, Genentech, Seagen, Genentech, Merck, Roche, Pfizer, Amgen, and Incyte.Todd Bourcier, Andrew Goodwin and Ronald Wange are employed by the United States Food and Drug Administration Center for Drug Evaluation and Research., (Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.)
- Published
- 2023
- Full Text
- View/download PDF
29. Effect of Nordic Sensi® Chair on Behavioral and Psychological Symptoms of Dementia in Nursing Homes Residents: A Randomized Controlled Trial.
- Author
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García-Alberca JM, de la Rosa MD, Solo de Zaldívar P, Ledesma M, Oltra E, Gris E, Ocejo O, Torrecilla J, Zafra C, Sánchez-Fernández A, Mancilla T, López-Romero M, Jerez R, Santana N, Lara JP, Barbancho MÁ, and Blanco-Reina E
- Subjects
- Humans, Single-Blind Method, Nursing Homes, Behavioral Symptoms etiology, Behavioral Symptoms therapy, Behavioral Symptoms diagnosis, Dementia diagnosis, Alzheimer Disease diagnosis
- Abstract
Background: Behavioral and psychological symptoms of dementia (BPSD) are present in most people with dementia (PwD), including Alzheimer's disease. There is consensus that non-pharmacological therapies represent the first line of treatment to address BPSD., Objective: We explore the efficacy of the use of a rocking chair (Nordic Sensi® Chair, NSC) in the treatment of BPSD in nursing home residents with moderate and severe dementia., Methods: We carried out a 16-week randomized, single-blind, controlled, clinical trial with PwD admitted to nursing homes. Participants were assigned to a treatment group (n = 40) that received three times a week one session per day of 20 minutes in the NSC and a control group (n = 37). The Neuropsychiatric Inventory-Nursing Home (NPI-NH) was used as primary efficacy outcome. Occupational distress for the staff was evaluated using the NPI-NH Occupational Disruptiveness subscale (NPI-NH-OD). Statistical analyses were conducted by means of a Mixed Effects Model Analysis., Results: Treatment with the NSC was associated with a beneficial effect in most of BPSD, as reflected by differences between the treatment and control group on the NPI-NH total score (mean change score -18.87±5.56 versus -1.74±0.67, p = 0.004), agitation (mean change score -2.32±2.02 versus -0.78±1.44, p = 0.003) and irritability (mean change score -3.35±2.93 versus -1.42±1.31, p = 0.004). The NPI-NH-OD total score also improved the most in the treatment group (mean change score -9.67±7.67 versus -7.66±6.08, p = 0.003)., Conclusions: The reduction in overall BPSD along with decreased caregiver occupational disruptiveness represent encouraging findings, adding to the potential of nonpharmacological interventions for nursing home residents living with dementia.
- Published
- 2023
- Full Text
- View/download PDF
30. COVID-19 impact on the emergency and hospitalization of a tertiary hospital. Management lessons learned.
- Author
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Martínez-Navarro G, Lozano-Zafra C, Caballero-Chabrera F, Modesto-Alapont V, and Oltra-Benavent M
- Subjects
- Humans, Child, Pandemics, Tertiary Care Centers, SARS-CoV-2, Emergencies, Retrospective Studies, Emergency Service, Hospital, Hospitalization, COVID-19
- Abstract
Introduction: The objective is to analyze the impact of the COVID-19 pandemic on the pediatric emergencies and hospital admissions., Methods: Retrospective cohort study of patients treated in a tertiary hospital, from March 14 to April 26, 2020, compared to the same period of the previous 3 years., Results: A notable overall reduction in emergency room visits and admissions is observed in all pediatric areas, maintaining care in neonatology and scheduled admissions in oncology., Discussion: The reduction in global activity in pediatric emergencies is not only explained by the decrease in contagious diseases. The decrease in inadequate demand and inappropriate income may have contributed. The availability of pediatric beds would make the reduction of programmed surgical activity unnecessary and would allow the redistribution of resources to areas with greater healthcare pressure., (Copyright © 2021 Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica. Published by Elsevier España, S.L.U. All rights reserved.)
- Published
- 2022
- Full Text
- View/download PDF
31. Increasing the Reuse of Protein Non-Naïve Nonhuman Primates in Pharmaceutical Drug Discovery and Development: An Overview and Industry Position on the Challenges and Benefits.
- Author
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Mattis C, Bratcher N, Burns M, Carosino C, de Zafra C, Fancher RM, Georgi K, Graff C, Hukkanen RR, Johnson C, Lao Y, Lange A, Lee D, Lepherd M, Maguire S, Malisauskas M, Manuel M, Miranda S, Reed L, Santos R, Sayers B, Shaw D, and Shuster D
- Subjects
- Animals, Drug Evaluation, Preclinical methods, Drug Industry methods, Pharmaceutical Preparations, Drug Discovery, Primates
- Abstract
The IQ Consortium NHP Reuse Working Group (WG) comprises members from 15 pharmaceutical and biotechnology companies. In 2020, the WG developed and distributed a detailed questionnaire on protein non-naïve NHP reuse to the WG member companies. The WG received responses from key stakeholders including principal investigators, facility managers, animal welfare officers and research scientists. This paper's content reflects the consolidated opinion of the WG members and the questionnaire responses on the subject of NHP reuse within nonclinical programs at all stages of research and development. Many of the pharmaceutical companies represented in the working group or participating in the questionnaire have already achieved some level of NHP reuse in their nonclinical programs, but the survey results suggested that there is significant potential to increase NHP reuse further and a need to understand the considerations involved in reuse more clearly. The WG has also focused carefully on the inherent concerns and risks of implementing protein non-naive NHP reuse and has evaluated the best methods of risk assessment and decision-making. This paper presents a discussion on the challenges and opportunities surrounding protein non-naïve NHP reuse and aims to stimulate further industry dialogue on the subject and provide guidance for pharmaceutical companies to establish roadmaps and decision trees enabling increased protein non-naïve NHP reuse. In addition, this paper represents a solid basis for collaborative engagement between pharmaceutical and biotechnology companies with contract research organizations (CROs) to discuss how the availability of protein non-naïve NHP within CROs can be better leveraged for their use within nonclinical studies.
- Published
- 2022
- Full Text
- View/download PDF
32. Membrane protein production and formulation for drug discovery.
- Author
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Gulezian E, Crivello C, Bednenko J, Zafra C, Zhang Y, Colussi P, and Hussain S
- Subjects
- Antibodies, Monoclonal, Drug Design, Humans, Ion Channels, Drug Discovery, Membrane Proteins
- Abstract
Integral membrane proteins (MPs) are important drug targets across most fields of medicine, but historically have posed a major challenge for drug discovery due to difficulties in producing them in functional forms. We review the state of the art in drug discovery strategies using recombinant multipass MPs, and outline methods to successfully express, stabilize, and formulate them for small-molecule and monoclonal antibody therapeutics development. Advances in structure-based drug design and high-throughput screening are allowing access to previously intractable targets such as ion channels and transporters, propelling the field towards the development of highly specific therapies targeting desired conformations., Competing Interests: Declaration of interests All authors are employees of TetraGenetics Inc., (Copyright © 2021 Elsevier Ltd. All rights reserved.)
- Published
- 2021
- Full Text
- View/download PDF
33. COVID-19 impact on the emergency and hospitalization of a tertiary hospital. Management lessons learned.
- Author
-
Martínez-Navarro G, Lozano-Zafra C, Caballero-Chabrera F, Modesto-Alapont V, and Oltra-Benavent M
- Abstract
Introduction: The objective is to analyze the impact of the COVID-19 pandemic on the pediatric emergencies and hospital admissions., Methods: Retrospective cohort study of patients treated in a tertiary hospital, from March 14 to April 26, 2020, compared to the same period of the previous 3 years., Results: A notable overall reduction in emergency room visits and admissions is observed in all pediatric areas, maintaining care in neonatology and scheduled admissions in oncology., Discussion: The reduction in global activity in pediatric emergencies is not only explained by the decrease in contagious diseases. The decrease in inadequate demand and inappropriate income may have contributed. The availability of pediatric beds would make the reduction of programmed surgical activity unnecessary and would allow the redistribution of resources to areas with greater healthcare pressure., (Copyright © 2021 Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica. Publicado por Elsevier España, S.L.U. All rights reserved.)
- Published
- 2021
- Full Text
- View/download PDF
34. A simplified method for determining potential heavy metal loads washed-off by stormwater runoff from road-deposited sediments.
- Author
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Zafra C, Temprano J, and Suárez J
- Abstract
A simplified method is proposed for determining the potential load of heavy metals (HMs) derived from the wash-off caused by surface runoff on road-deposited sediment (RDS). The method consists of three phases: (i) characterization of RDS load wash-off, (ii) assessment of HM load in dry weather, and (iii) application of a wash-off equation. Two processes were included in the wash-off equation: HM transport (solid fraction) and HM leaching (dissolved fraction). The average wash-off of HMs ranges from 16.6 to 46.3%, relative to the total mass of HMs associated with dry-weather RDS (Pb, Zn, Cu, Cr, Ni, Cd, Fe, Mn, Co, and Ba). Cd, Mn, and Zn presented the highest wash-off in the areas studied. The size fraction below 250μm contributed an average of 86.7% of potential HM load washed-off from RDS. Based on the phenomena included in the wash-off equation, it was observed the following order of precedence: transport of RDS<250μm, leaching of RDS<250μm, and leaching of RDS≥250μm. Solid and dissolved fractions contributed 70.7 and 29.3% of the potential HM load washed-off by runoff from RDS, respectively. The proposed method serves as a management tool for road HM pollution during rain., (Copyright © 2017 Elsevier B.V. All rights reserved.)
- Published
- 2017
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- View/download PDF
35. Simvastatin treatment improves liver sinusoidal endothelial dysfunction in CCl4 cirrhotic rats.
- Author
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Abraldes JG, Rodríguez-Vilarrupla A, Graupera M, Zafra C, García-Calderó H, García-Pagán JC, and Bosch J
- Subjects
- Animals, Cyclic GMP metabolism, Liver metabolism, Male, Nitric Oxide metabolism, Nitric Oxide Synthase Type III metabolism, Perfusion, Phosphorylation, Rats, Rats, Wistar, Anticholesteremic Agents pharmacology, Carbon Tetrachloride toxicity, Liver pathology, Liver Cirrhosis drug therapy, Liver Diseases drug therapy, Simvastatin pharmacology
- Abstract
Background/aims: Sinusoidal endothelial dysfunction with decreased nitric oxide (NO) production contributes to increased hepatic resistance in cirrhosis. Statins improve endothelial dysfunction in peripheral vasculature. This study was designed to characterize the hemodynamic and molecular effects of statins in cirrhotic rats., Methods: Systemic and splanchnic hemodynamics were evaluated in CCl(4) ascitic cirrhotic rats treated with placebo or simvastatin (25 mg/kg/day, for 3 days), at baseline and after volume expansion. Vascular responses of liver vasculature were evaluated after isolation and perfusion of the liver., Results: There were no differences in baseline hemodynamics in rats treated with simvastatin or placebo. However, in rats treated with simvastatin the increase in portal pressure induced by volume expansion was significantly attenuated. In isolated and perfused cirrhotic livers simvastatin pre-treatment significantly attenuated the pressure response to methoxamine, and significantly improved paradoxical vasoconstriction induced by acetylcholine. These effects were not observed in the presence of a nitric oxide synthase inhibitor. Simvastatin increased eNOS expression, Akt-dependent eNOS phosphorylation and cGMP liver content., Conclusions: The administration of simvastatin might constitute a new way to selectively increase NO availability in the cirrhotic liver circulation and, therefore improve the vascular disturbances that contribute to portal hypertension.
- Published
- 2007
- Full Text
- View/download PDF
36. [Non-immunoallergic hepatotoxicity due to mesalazine].
- Author
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Barroso N, Leo E, Guil A, Larrauri J, Tirado C, Zafra C, Gavilán F, and Reina FR
- Subjects
- Chemical and Drug Induced Liver Injury diagnosis, Colitis complications, Colitis drug therapy, Diagnosis, Differential, Female, Humans, Lymphocytes, Middle Aged, Anti-Inflammatory Agents, Non-Steroidal adverse effects, Chemical and Drug Induced Liver Injury etiology, Mesalamine adverse effects
- Abstract
Mesalazine is an aminosalicillic derivative considered as a safe alternative to the relative frequency (5-55%) of adverse effects observed with sulfasalazine. The well known hepatoxicity associated with sulfasalazine and attributed to its sulfamidic fraction is limited to few cases described in the treatment with mesalazine. We herein present a new case of hepatoxicity by mesalazine in a patient with lymphocytic colitis. The possible pathogenic mechanism is also commented upon.
- Published
- 1999
37. Role of GABAA receptors in the organization of brain and behavioural sex differences.
- Author
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Segovia S, del Cerro MC, Ortega E, Pérez-Laso C, Rodriguez-Zafra C, Izquierdo MA, and Guillamón A
- Subjects
- Animals, Female, Male, Rats, Rats, Wistar, Behavior, Animal physiology, Brain physiology, Receptors, GABA-A physiology, Sex Characteristics
- Abstract
Sex differences in GABA neurotransmitter have been described. We have studied the involvement of the GABAA receptor in sex differences in the brain and reproductive behaviour. Neonatal administration of the GABAA agonist diazepam to male rats facilitated the induction of maternal behaviour in adults, while the antagonist picrotoxin disrupted it in females. Sex differences in the accessory olfactory bulb were also reversed, but gonadal function remained unaltered in both sexes. This suggests that neonatal changes in neuronal membrane permeability to Cl- ions may play a role in the organization of sex differences. Our study constitutes a new model for understanding the early neurobiological organization of sex differences.
- Published
- 1996
- Full Text
- View/download PDF
38. Kinetics and characteristics of murine macrophage-lymphocyte interaction in presence of PHA: appearance of multinucleated giant cells in vitro.
- Author
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Gaytan F, Zafra C, de la Fuente M, Solana R, Luque J, and Peña J
- Subjects
- Animals, Lymphocyte Activation, Lymphocytes cytology, Macrophages cytology, Mice, Phagocytosis, Rosette Formation, Time Factors, Lymphocytes immunology, Macrophages immunology, Phytohemagglutinins pharmacology
- Abstract
The appearance of cellular associations between macrophages and lymphocytes--which we have denominated macrophage-lymphocyte rosettes--and their kinetic formation in the presence of phytohemagglutinin (PHA) have been studied in B10 A (4R) mice. The greatest number of macrophage-lymphocyte rosettes was found from 6 to 12 hours after incubation with PHA. During this time, 42.38 +/- 10.70 of the total number of macrophages had lymphocytes attached to their membranes. This percentage decreased to 17.33 +/- 2.07% after 24 hours. The activation of macrophages after PHA treatment was tested by the phagocytic capacity of these cells. This activity increased significantly 24 hours after incubation. In our assay, an increase in the appearance of multinucleated giant cells when compared to controls was also observed. When the macrophages were lymphocyte depleted, the appearance of the multinucleated giant cells was significantly lower. The kinetics for these formations are also discussed.
- Published
- 1983
39. [Effect of a new synthetic cyclic-nucleoside on cell proliferation].
- Author
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Fernández MM, de la Fuente M, Zafra C, Solana R, and Peña J
- Subjects
- Animals, Cell Division drug effects, Humans, In Vitro Techniques, Mice, Nucleosides pharmacology, Antineoplastic Agents pharmacology, Carcinoma, Ehrlich Tumor pathology, Indolequinones, T-Lymphocytes drug effects
- Abstract
The activity of a new synthetic C-nucleoside upon cell proliferation was tested using mouse Ehrlich ascites tumor cells and PHA-stimulated human blood T lymphocytes. The product did not modify the cancer cells reproduction. Contrarily, it inhibited T lymphocytes proliferation.
- Published
- 1983
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