Early Unguided Human Brain Organoid Neurovascular Niche Modeling into the Permissive Chick Embryo Chorioallantoic Membrane.

Engrafting organoids into vascularized tissues in model animals, such as the immunodeficient mouse or chick embryo chorioallantoic membrane (CAM), has proven efficient for neovascularization modeling. The CAM is a richly vascularized extraembryonic membrane, which shows limited immunoreactivity, thus becoming an excellent hosting model for human origin cell transplants. This paper describes the strategy to engraft human brain organoids differentiated at multiple maturation stages into the CAM. The cellular composition of brain organoids changes with time, reflecting the milestones of human brain development. We grafted brain organoids at relevant maturation stages: neuroepithelial expansion (18 DIV), early neurogenesis (60 DIV), and early gliogenesis (180 DIV) into the CAM of embryonic day (E)7 chicken embryos. Engrafted brain organoids were harvested 5 days later and their histological features were analyzed. No histological signs of neovascularization in the grafted organoids or abnormal blood vessels adjacent to the graftings were detected. Moreover, remarkable changes were observed in the cellular composition of the grafted organoids, namely, an increase in the number of glial fibrillary acidic protein-positive-reactive astrocytes. However, the cytoarchitectural changes were dependent on the organoid maturation stage. Altogether, these results suggest that brain organoids can grow in the CAM, and they show differences in the cytoarchitecture depending on their maturation stage at grafting.

Características clínico - epidemiológicas de los accidentes ofídicos en un hospital de la Amazonía del Perú / Clinico-epidemiologic characteristics of ophidic accidents in a hospital of the amazonia of Peru

Introducción: En el Perú, los accidentes ofídicos son un importante problema de salud pública, debido a una amplia distribución territorial de diferentes tipos de serpientes. Objetivo: Describir las características clínico - epidemiológicas y el manejo de los accidentes ofídicos registrados en un hospital de Perú. Métodos: Estudio de serie de casos, realizado entre enero del 2011 a diciembre 2015 en el Hospital Santa Rosa de Puerto Maldonado. Se revisaron 256 historias clínicas de pacientes con diagnóstico definitivo de ofidismo. Se analizaron variables sociodemográficas, clínicas y evolución de los pacientes. Resultados: El 78,5 por ciento de pacientes fueron varones, el grupo de edad más afectado fueron los adultos. La mayoría de los accidentes ocurrieron en el mes de marzo (12,5 por ciento). Un 39 por ciento de los pacientes se dedicaba al trabajo agrícola. Entre las 16:00 y 19:59 horas se produjeron 35,2 por ciento de los accidentes, 71,1 por ciento reportó como causante del accidente a la serpiente Bothrops atrox. El 71,5 por ciento de las mordeduras se presentaron en miembros inferiores. La mayoría de pacientes recibió tratamiento específico con antibotrópico polivalente (90,6 por ciento). Conclusiones: En la población estudiada, el sexo más afectado es el masculino con una edad entre 27 a 59 años. La serpiente más frecuente causante de los accidentes fue la Bothrops atrox, más conocida entre los pobladores como "jergón". En la mayoría de los casos se administró como tratamiento específico el suero antiofídico(AU)

Introduction: In Peru, ophidian accidents are an important public health problem due to a wide territorial distribution of different types of snakes. Objective: To describe the clinical-epidemiological characteristics and the management of ophidian accidents registered in a hospital in Peru. Methods: Case series study carried out between January 2011 to December 2015 at the Santa Rosa Hospital in Puerto Maldonado, 256 medical records of patients with a definitive diagnosis of ophidism were reviewed. Sociodemographic and clinical variables and the evolution of the patients were analyzed. Results: A total of 78.5 percent of patients were men, the age group most affected were adults. Most of the accidents occurred in March (12.5 percent). 39 percent of the patients were engaged in agricultural work. Between 4:00 p.m. and 7:59 p.m., 35.2 percent of the accidents occurred. 71.1 percent reported the Bothrops atrox snake as the cause of the accident. 71.5 percent of the bites occurred on the lower limbs. Most patients received specific treatment with polyvalent anti-botropic (90.6 percent). Conclusions: In the studied population, the most affected sex is the male with an age between 27 and 59 years. The most frequent snake causing the accidents was the Bothrops atrox, better known among the inhabitants as "jergón". In most cases, antivenom was administered as a specific treatment(AU)