Neuraminidase-activated microglia compromise the viability of ependymocytes

Neuraminidase (NA) is a sialidase present in the envelope/wall of some virus/bacteria responsible for brain infections, such as flu, mumps or meningitis. The intracerebroventricular injection of NA in the rat brain provokes ependymal detachment and death, and an acute inflammatory process. Although inflammation reverses, ependymal lining is not regenerated. Complement system activation within the CSF contributes to ependymal damage, but is not the only cause (Granados-Duran et al, 2016). Here we aimed to investigate if microglial activation might also play a role. For this purpose we used pure isolated ependymocytes (Grondona et al, 2013) and ventricular wall explants, which were co-cultured with microglial cells, both in basal conditions and with agents that induce microglial activation: NA, LPS, or Pam3CSK4 (synthetic lipopeptide). The viability of the ependymal cells was assessed by trypan blue exclusion. The viability of isolated ependymocytes was reduced when NA or LPS were added to the culture, compared to controls without additives. In the absence of microglia, NA or LPS did not compromise viability significantly, indicating that microglia was involved in ependymocytes death. The addition of NA to cultured explants reduced ependymocytes viability only when microglial cells were present in the culture; a similar reduction was observed when LPS or Pam3CSK4 were added. Conversely, explants cultured in the absence of microglia did not suffer a significant decrease in ependymocytes viability upon NA addition to the medium. We hypothesized that cytokines released by activated microglia, such as IL1β or TNFα, could mediate ependymocytes death. RT-PCR performed in RNA obtained from pure ependymocytes confirmed the presence of IL1β and TNFα receptors in ependymal cells. Nevertheless further experiments are required to confirm this hypothesis. We conclude that microglia activated by NA mediates, at least in part, ependymal cell death, what might be relevant for neuroinflammatory diseases mediated by NA bearing virus/bacteria.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

The Principles of Gold-Catalyzed Molecular Gymnastics

L'or(I) dirigeix el contorsionisme molecular mitjançant reaccions intramoleculars i intermoleculars d'enins per mitjà d'intermedis ciclopropil o carbens altament distorsionats. La síntesi de productes naturals com (+)-orienalol F i (-)-englerin A mostra l'estat d'art de la catàlisi de l'or(I) per a construir complexitat molecular.Gold(I) orchestrates molecular gymnastics by intraand intermolecular reaction of enymes via highly distorted cyclopropyl gold carbenes as intermediates. The synthesis of natural products such as (+)-orientalol F and (−)-englerin A illustrates the state of the art of gold (I) catalysis for the buildup of molecular complexity

Para asombrarse y aprender

Este trabajo presenta la fundamentación, diseño y resultados de un proyecto realizado en el marco de un programa institucional en la UNAM, relacionado con la innovación de la enseñanza experimental. Como producto de este proyecto se elaboró un libro con 30 experimentos de aula dirigidos a profesores de los niveles bachillerato y universitario. Los experimentos elaborados presentan propuestas experimentales novedosas que nos permitan reconceptualizar y diversificar el trabajo práctico

The CIAO Multi-Dialect Compiler and System: An Experimentation Workbench for Future (C)LP Systems

CIAO is an advanced programming environment supporting Logic and Constraint programming. It offers a simple concurrent kernel on top of which declarative and non-declarative extensions are added via librarles. Librarles are available for supporting the ISOProlog standard, several constraint domains, functional and higher order programming, concurrent and distributed programming, internet programming, and others. The source language allows declaring properties of predicates via assertions, including types and modes. Such properties are checked at compile-time or at run-time. The compiler and system architecture are designed to natively support modular global analysis, with the two objectives of proving properties in assertions and performing program optimizations, including transparently exploiting parallelism in programs. The purpose of this paper is to report on recent progress made in the context of the CIAO system, with special emphasis on the capabilities of the compiler, the techniques used for supporting such capabilities, and the results in the áreas of program analysis and transformation already obtained with the system

Inglés técnico naval

El objetivo del presente libro es ofrecer a profesores, alumnos y profesionales en general del mundo de la industria y la navegación, la posibilidad de disponer de un texto de trabajo y consulta sobre el inglés técnico naval. El libro se divide en 21 unidades, que versan cada una de ellas sobre diferentes aspectos relacionados con el buque: materiales y procedimientos usados en su construcción, tipos de buques, partes principales del buque, estabilidad, etc.360 pág

El Taiji Quan y Qigong en la promoción de la salud y en el afrontamiento del estrés

Exercise and physical activity improves psychological and physical health in users. However, rarely it is examined the quantitative effects of Tai Chi in cardiovascular, locomotor, mental, cognitive and psychosocial systems among others. The effects on stress, blood pressure and cardiopulmonary risk, breathing capacity and its impact on diseases of this system, balance, muscle elasticity on the locomotor system, anxiety, depression and disorders of systematically reviewed mood in both eastern and western populations. 53 studies were considered and 5875 subject were studied. Tai Chi appears to be associated with improvements in the vast majority of systems that analyze the authors but stresses the psychological well-being, including reducing stress, anxiety, depression and improvements to musculoskeletal level. Conclusion: these are limited due to variation in design, the various results and incorrect quality controls. Randomized trials are necessary to ensure the evidence.El ejercicio y la actividad física mejoran la salud psicológica y física de los usuarios. Sin embargo, pocas veces se han examinado los efectos cuantitativos del Tai Chi Chuan en los sistemas cardiovascular, locomotor, mental, cognitivo y psicosocial entre otros. Se revisaron sistemáticamente los efectos sobre el estrés, la presión arterial y el riesgo cardiopulmonar, la capacidad respiratoria y su incidencia sobre patologías de este sistema, el equilibrio, la elasticidad muscular sobre el sistema locomotor, la ansiedad, la depresión y trastornos del estado de ánimo en las poblaciones orientales y occidentales. Se han considerado 53 estudios con una muestra de 5.875 sujetos y 13 meta análisis. Hay que resaltar que el Tai Chi parece estar asociado con mejoras en la gran mayoría de los sistemas que analizan los autores pero destaca el bienestar psicológico, incluyendo la reducción del estrés, ansiedad, depresión así como las mejoras a nivel musculo esquelético. Las conclusiones definitivas son limitadas debido a la variación en los diseños, los resultados diversos y los controles incorrectos de calidad. Son necesarios más ensayos aleatorios que garanticen la evidencia