Nanostructured porous silicon micropatterns as a tool for substrate-conditioned cell research

The localized irradiation of Si allows a precise patterning at the microscale of nanostructured materials such as porous silicon (PS). PS patterns with precisely defined geometries can be fabricated using ion stopping masks. The nanoscale textured micropatterns were used to explore their influence as microenvironments for human mesenchymal stem cells (hMSCs). In fact, the change of photoluminescence emission from PS upon aging in physiological solution suggests the intense formation of silanol surface groups, which may play a relevant role in ulterior cell adhesion. The experimental results show that hMSCs are sensitive to the surface micropatterns. In this regard, preliminary β-catenin labeling studies reveal the formation of cell to cell interaction structures, while microtubule orientation is strongly influenced by the selective adhesion conditions. Relevantly, Ki-67 assays support a proliferative state of hMSCs on such nanostructured micropatterns comparable to that of standard cell culture platforms, which reinforce the candidature of porous silicon micropatterns to become a conditioning structure for in vitro culture of hMSCsThe authors gratefully acknowledge the financial support from MICINN under research project MAT2008-06858-C02-01/NAN and Comunidad de Madrid (Spain) under Project Microseres. Technical support from L García Pelayo is greatly appreciate

Engineering of silicon surfaces at the micro- and nanoscales for cell adhesion and migration control

The engineering of surface patterns is a powerful tool for analyzing cellular communication factors involved in the processes of adhesion, migration, and expansion, which can have a notable impact on therapeutic applications including tissue engineering. In this regard, the main objective of this research was to fabricate patterned and textured surfaces at micron- and nanoscale levels, respectively, with very different chemical and topographic characteristics to control cell–substrate interactions. For this task, one-dimensional (1-D) and two-dimensional (2-D) patterns combining silicon and nanostructured porous silicon were engineered by ion beam irradiation and subsequent electrochemical etch. The experimental results show that under the influence of chemical and morphological stimuli, human mesenchymal stem cells polarize and move directionally toward or away from the particular stimulus. Furthermore, a computational model was developed aiming at understanding cell behavior by reproducing the surface distribution and migration of human mesenchymal stem cells observed experimentally

Relationship between olive oil consumption and ankle-brachial pressure index in a population at high cardiovascular risk

The aim of this study was to ascertain the association between the consumption of different categories of edible olive oils (virgin olive oils and olive oil) and olive pomace oil and ankle-brachial pressure index (ABI) in participants in the PREDIMED-Plus study, a trial of lifestyle modification for weight and cardiovascular event reduction in individuals with overweight/obesity harboring the metabolic syndrome. Methods: We performed a cross-sectional analysis of the PREDIMED-Plus trial. Consumption of any category of olive oil and olive pomace oil was assessed through a validated food-frequency questionnaire. Multivariable linear regression models were fitted to assess associations between olive oil consumption and ABI. Additionally, ABI ≤1 was considered as the outcome in logistic models with different categories of olive oil and olive pomace oil as exposure. Results: Among 4330 participants, the highest quintile of total olive oil consumption (sum of all categories of olive oil and olive pomace oil) was associated with higher mean values of ABI (beta coefficient: 0.014, 95% confidence interval [CI]: 0.002, 0.027) (p for trend = 0.010). Logistic models comparing the consumption of different categories of olive oils, olive pomace oil and ABI ≤1 values revealed an inverse association between virgin olive oils consumption and the likelihood of a low ABI (odds ratio [OR] 0.73, 95% CI [0.56, 0.97]), while consumption of olive pomace oil was positively associated with a low ABI (OR 1.22 95% CI [1.00, 1.48]). Conclusions: In a Mediterranean population at high cardiovascular risk, total olive oil consumption was associated with a higher mean ABI. These results suggest that olive oil consumption may be beneficial for peripheral artery disease prevention, but longitudinal studies are needed

Clonal chromosomal mosaicism and loss of chromosome Y in elderly men increase vulnerability for SARS-CoV-2

The pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2, COVID-19) had an estimated overall case fatality ratio of 1.38% (pre-vaccination), being 53% higher in males and increasing exponentially with age. Among 9578 individuals diagnosed with COVID-19 in the SCOURGE study, we found 133 cases (1.42%) with detectable clonal mosaicism for chromosome alterations (mCA) and 226 males (5.08%) with acquired loss of chromosome Y (LOY). Individuals with clonal mosaic events (mCA and/or LOY) showed a 54% increase in the risk of COVID-19 lethality. LOY is associated with transcriptomic biomarkers of immune dysfunction, pro-coagulation activity and cardiovascular risk. Interferon-induced genes involved in the initial immune response to SARS-CoV-2 are also down-regulated in LOY. Thus, mCA and LOY underlie at least part of the sex-biased severity and mortality of COVID-19 in aging patients. Given its potential therapeutic and prognostic relevance, evaluation of clonal mosaicism should be implemented as biomarker of COVID-19 severity in elderly people. Among 9578 individuals diagnosed with COVID-19 in the SCOURGE study, individuals with clonal mosaic events (clonal mosaicism for chromosome alterations and/or loss of chromosome Y) showed an increased risk of COVID-19 lethality

Preparation, Modification and Cellular Evaluation of PEG-PEGd Supports With Titania Nanoparticle Loads

Polyethylene-glycol (PEG) films with PEG-diacrylate (PEGd) have been prepared including a Ti alkoxyde that turns the film into a nano-hybrid with potential interest for the production of controlled bioadhesive surfaces. Precursor sols were cast onto Si (100) surfaces producing conformed films. Modification of such surfaces was performed by exposing surfaces to UV light (365 nm) at different exposure times. The surface of the hybrid films was characterized by using atomic force microscopy and X-ray photoelectron spectroscopy. It is concluded that the UV exposure induces a densification of the film and an in-film coalescence of the titania nanoparticles. This had a direct effect in the wettability of the films as determined by water contact angle measurements. Both, as cast and UV modified surfaces were proved to be biocompatible as deduced from nuclear immunocytochemistry proliferation assays.JRC.I.4-Nanobioscience

Optimized Allylamine Deposition for Improved Pluripotential Cell Culture

Deposition of allylamine (ALL) by plasma enhanced chemical vapor deposition has been optimized on silicon based models. Simultaneous energy recoil detection analysis and Rutherford backscattering spectra show that 100Wdeposition is ideal in terms of polymerized film formation and H content while, lower or higher power induce reduced film retention or excessive cross linking, respectively. Surface composition of the ALL film was further probed by X-ray photoelectron spectroscopy revealing a monocomponent N 1s spectrum compatible with the presence of primary amines. Optimized ALL films were applied to polycaprolactone (PCL) surfaces after Ar plasma activation with implications in the chemistry and wettability of this biocompatible polymer. Human mesenchymal stem cells (hMSCs) were cultured on ALL coated PCL surface and controls. ALL functionalized PCL was found to be especially attractive for the formation of confluent monolayers of hMSCs after 72 h of culture.JRC.I.4-Nanobioscience

Salud comunitaria confinada: Reflexiones y experiencias desde la salud pública local

This paper aims to share the reflections related to the community actions in which the Agència de Salut Pública de Barcelona has been involved during the emergency of COVID-19. The tasks carried out can be arranged in three stages, frequently overlapping: detection of needs and problems; contact with key stakeholders to assess what to do and how to do it; adaptation of the interventions to the “new normal” and generation of new responses. The emerging problems included: not being able to do the confinement (due to homelessness, material conditions, living in a situation of violence); digital gap (lack of knowledge, devices, access to Wifi); greater exposure to COVID-19 in the essential but precarious, feminized and racialized jobs (care, cleaning, food shops) that are the most frequent in the neighborhoods in where we work; language and cultural barriers that preclude to follow recommendations; to lose employment; insufficient income to cover basic needs; social isolation; and the deterioration of emotional health caused by the situation. During the process, some interventions were adapted to be delivered on-line. Solidarity networks and local resources were key to meet basic needs, but also other needs related to lack of digital knowledge or device. Community action in health, from a critical, intersectional and local perspective, and with intersectoral work and community participation, can contribute to: facilitate a contextualized response in the event of a health crisis; mitigate the effects derived from its economic and social crisis.Este artículo pretende compartir las reflexiones sobre la acción comunitaria en que la Agència de Salut Pública de Barcelona ha estado involucrada en la emergencia de COVID-19. El trabajo realizado puede ordenarse en tres etapas, frecuentemente solapadas: detectar necesidades o problemas, e informar; contactar con las personas participantes y agentes territoriales para valorar qué hacer y cómo hacerlo; y adaptar las intervenciones a la “nueva normalidad” y generar respuestas con los activos comunitarios a las necesidades detectadas. Los problemas emergentes incluyeron: no poder realizar el confinamiento (por falta de casa, condiciones materiales, vivir en situación de violencia); brecha digital (falta de conocimientos, dispositivos, acceso a Wifi); mayor exposición al COVID-19 en los trabajos esenciales pero precarizados, feminizados y racializados (cuidados, limpieza, alimentación), frecuentes en los barrios en que trabajamos; barreras idiomáticas y culturales para seguir las recomendaciones; pérdida de empleo; ingresos insuficientes para cubrir necesidades básicas; dificultades de conciliación; aislamiento social; y deterioro de la salud emocional provocado por la situación. Durante el proceso, algunas intervenciones se adaptaron para continuar de forma telemática, y se intentaron cubrir las necesidades primarias sobre conocimientos y dispositivos de algunas personas participantes a través de las redes solidarias y recursos existentes. La acción comunitaria en salud, desde una mirada crítica, interseccional y local, mediante trabajo intersectorial y la participación de la comunidad, puede contribuir a: facilitar una respuesta adaptada al contexto en caso de crisis sanitaria y mitigar los efectos derivados de esta crisis económica y social

La importancia de conocer el idioma

Este proyecto consiste en mejorar el uso cotidiano de la lengua castellana, abordándola desde el vocabulario, la ortografía y la compresión lectora en las distintas asignaturas. Para dar mayor globalidad al ejercicio, se trabaja también estos factores en otros idiomas como el inglés y el francés. Los objetivos son desarrollar un vocabulario adecuado a las distintas materias; escribir correctamente; trabajar la comprensión de los textos; aumentar la cohesión y la coordinación entre alumnos y profesores; fomentar la utilización de distintos métodos de enseñanza-aprendizaje; fomentar el interés con actividades motivadoras e innovadoras en la enseñanza curricular; y potenciar el trabajo en grupo e individual. Las actividades llevadas a la práctica son acordes a la edad y a los objetivos propuestos. Se elaboran listados de palabras de ortografía dudosa, se trabajan textos para acceder a su comprensión, se hacen concursos de ortografía, se cuelgan carteles por pasillos y aulas con palabras significativas, se fabrican tarjetas para jugar-aprendiendo en clases y tutorías, y se utilizan programas de ordenador que refuerzan el aprendizaje de vocabulario y ortografía. La metodología pone en activo tanto a profesores como a alumnos. Los primeros se encargan de hacer los listados de palabras y de preparar y dar formato a las pruebas eliminatorias del concurso. Los alumnos se encargan de buscar la información necesaria para definir las palabras, hacer los carteles y exponer las conclusiones. La evaluación consiste principalmente en reuniones de profesores que analizan el desarrollo del proyecto, exponen las dificultades encontradas y establecen modificaciones y correcciones en relación a los ejercicios. Como anexo se presentan dos CD-ROM con las actividades realizadas..Madrid (Comunidad Autónoma). Consejería de Educación. Dirección General de Mejora de la Calidad de la EnseñanzaMadridMadrid (Comunidad Autónoma). Subdirección General de Formación del Profesorado. CRIF Las Acacias; General Ricardos 179 - 28025 Madrid; Tel. + 34915250893ES

Relationship between olive oil consumption and ankle-brachial pressure index in a population at high cardiovascular risk

Background and aims: The aim of this study was to ascertain the association between the consumption of different categories of edible olive oils (virgin olive oils and olive oil) and olive pomace oil and ankle-brachial pressure index (ABI) in participants in the PREDIMED-Plus study, a trial of lifestyle modification for weight and cardiovascular event reduction in individuals with overweight/obesity harboring the metabolic syndrome. Methods: We performed a cross-sectional analysis of the PREDIMED-Plus trial. Consumption of any category of olive oil and olive pomace oil was assessed through a validated food-frequency questionnaire. Multivariable linear regression models were fitted to assess associations between olive oil consumption and ABI. Additionally, ABI ≤1 was considered as the outcome in logistic models with different categories of olive oil and olive pomace oil as exposure. Results: Among 4330 participants, the highest quintile of total olive oil consumption (sum of all categories of olive oil and olive pomace oil) was associated with higher mean values of ABI (beta coefficient: 0.014, 95% confidence interval [CI]: 0.002, 0.027) (p for trend = 0.010). Logistic models comparing the consumption of different categories of olive oils, olive pomace oil and ABI ≤1 values revealed an inverse association between virgin olive oils consumption and the likelihood of a low ABI (odds ratio [OR] 0.73, 95% CI [0.56, 0.97]), while consumption of olive pomace oil was positively associated with a low ABI (OR 1.22 95% CI [1.00, 1.48]). Conclusions: In a Mediterranean population at high cardiovascular risk, total olive oil consumption was associated with a higher mean ABI. These results suggest that olive oil consumption may be beneficial for peripheral artery disease prevention, but longitudinal studies are needed