13 research outputs found

    DHT and E2 as modulators of apoptotic signaling in rat Sertoli cells

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    Apoptosis is an important regulatory event in testicular homeostasis and optimization of sperm production. Sertoli cells (SCs) form the blood-testis barrier creating a special microenvironment where germ cells develop and are under strict hormonal control. Estrogens and androgens are known to play critical roles in SCs functioning, improving their in vitro survival by preventing apoptotic progression. Herein, the influence of 17ÎČ-estradiol (E2) and 5α-dihydrotestosterone (DHT) on the apoptotic signaling pathways of immature rat cultured SCs was studied. For that purpose key points of the apoptotic pathway that interact with the mitochondria were chosen and the mRNA expression and/or protein levels of several apoptotic markers such as p53, the pro-apoptotic Bcl2 family member Bax, the apoptosis-inducing factor (AIF) and caspase-3 and 9 were evaluated. Caspase-3 activity was also evaluated as an endpoint marker of apoptosis. E2 and DHT down-regulated the mRNA transcript levels of p53, Bax, caspase-9 and caspase-3. The protein levels of AIF were reduced after DHT treatment while E2-treated cells decreased the cleaved caspase-9 protein levels. The apoptotic endpoint Caspase-3 activity presented highly decreased levels after hormonal treatment. Taken together, these results showed that E2 and DHT act as apoptotic signaling modulators in in vitro immature rat SCs suggesting that androgens and estrogens may be capable of modulating independent pathways of the apoptotic event by regulating different pro-apoptotic factors.A apoptose Ă© um evento regulador importante na homeostase testicular e na otimização da produção de espermatozoides. As cĂ©lulas de Sertoli formam a barreira hematotesticular, criando um microambiente especial onde as cĂ©lulas germinativas se desenvolvem e estĂŁo sob controle hormonal estrito. De facto, os estrogĂ©nios e os androgĂ©nios sĂŁo conhecidos por desempenharem um papel importante no funcionamento das cĂ©lulas de Sertoli, melhorando a sua sobrevivĂȘncia in vitro e impedindo a progressĂŁo da apoptose. Neste trabalho estudou-se a influĂȘncia do 17ÎČ-estradiol (E2) e da 5αdihidrotestosterona (DHT) nas vias de sinalização apoptĂłtica em culturas de cĂ©lulas de Sertoli de ratos imaturos. Para isso, foram selecionados pontos chave da via apoptĂłtica que interagem com a mitocĂŽndria e foram avaliados os nĂ­veis de expressĂŁo de mRNA e/ou dos nĂ­veis de proteĂ­na de vĂĄrios desses marcadores apoptĂłticos, tais como o p53, o membro prĂłapoptĂłtico da famĂ­lia Bcl-2 designado por Bax, o factor de indução de apoptose (AIF) e as caspase-9 e caspase-3. A actividade da caspase-3 foi tambĂ©m avaliada como um marcador da fase final da apoptose. Pudemos verificar que tanto o E2 como a DHT diminuĂ­ram os nĂ­veis de transcritos de mRNA do p53, Bax, caspase-9 e caspase-3. Os nĂ­veis proteicos de AIF foram tambĂ©m reduzidos apĂłs o tratamento com DHT, enquanto que nas cĂ©lulas tratadas com E2, se verificou uma diminuição nos nĂ­veis proteicos da caspase-9 clivada. A actividade da caspase-3 apresentou uma acentuada diminuição apĂłs o tratamento hormonal quer com E2, quer com DHT. Em conjunto, estes resultados demonstram que o E2 e a DHT actuam como moduladores in vitro da sinalização apoptĂłtica em cĂ©lulas de Sertoli de ratos imaturos, sugerindo que, nessas cĂ©lulas, os androgĂ©nios e os estrogĂ©nios podem ser capazes de modular vias independentes da apoptose, uma vez que parecem regular diferencialmente a expressĂŁo de factores prĂł-apoptĂłticos distintos

    CapacitaçÔes em Assentamentos Rurais e Comunidades Quilombolas: Críticas às IdealizaçÔes, Propostas de Educação Continuada

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    This paper addresses the issue of extension on agrarian reform in the State of SĂŁo Paulo, based on the proposed construction and completion of training established by the contract of service between INCRA – SP and UNIARA in year 2011. As a result of this experience, there were 31 training, totaling 280 hours of courses, covering 717 seated regions Andradina, Araraquara, Itapeva, Promised, RibeirĂŁo Preto, SĂŁo Paulo and Pontal do Paranapanema. In this article we discuss extension, the criteria for the proposed construction, describes the courses taken, and finally, the evaluation of those involved as to the limits and potential of the proposal. Refers also to the specific demands and workshops done in quilombolas communities.Keywords: University Extension, Rural Communities, Education, Learning.O presente trabalho aborda a temĂĄtica da extensĂŁo rural em assentamentos de reforma agrĂĄria no Estado de SĂŁo Paulo, tendo como base a proposta de construção e realização de capacitaçÔes estabelecidas atravĂ©s do contrato de prestação de serviços entre a SuperintendĂȘncia Regional do INCRA – SP e a UNIARA no ano de 2011. Como fruto desta experiĂȘncia, foram realizadas 31 capacitaçÔes, perfazendo 280 horas de cursos, abrangendo 717 assentados nas regiĂ”es de Andradina, Araraquara, Itapeva, PromissĂŁo, RibeirĂŁo Preto, grande SĂŁo Paulo e Pontal do Paranapanema. Neste artigo discute-se extensĂŁo rural, os critĂ©rios estabelecidos para construção da proposta, descrevese os cursos realizados e, por fim, a avaliação dos envolvidos quanto aos limites e potencialidades da proposta. Refere-se, tambĂ©m, Ă s especificidades das demandas e oficinas feitas nas comunidades quilombolas

    2 nd Brazilian Consensus on Chagas Disease, 2015

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    Abstract Chagas disease is a neglected chronic condition with a high burden of morbidity and mortality. It has considerable psychological, social, and economic impacts. The disease represents a significant public health issue in Brazil, with different regional patterns. This document presents the evidence that resulted in the Brazilian Consensus on Chagas Disease. The objective was to review and standardize strategies for diagnosis, treatment, prevention, and control of Chagas disease in the country, based on the available scientific evidence. The consensus is based on the articulation and strategic contribution of renowned Brazilian experts with knowledge and experience on various aspects of the disease. It is the result of a close collaboration between the Brazilian Society of Tropical Medicine and the Ministry of Health. It is hoped that this document will strengthen the development of integrated actions against Chagas disease in the country, focusing on epidemiology, management, comprehensive care (including families and communities), communication, information, education, and research

    O Museu Goeldi e a pesquisa arqueolĂłgica: um panorama dos Ășltimos dezessete anos (1991-2008)

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    Resumos concluĂ­dos - SaĂșde Coletiva

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    Resumos concluĂ­dos - SaĂșde Coletiv

    Resumos concluĂ­dos - SaĂșde Coletiva

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    Resumos concluĂ­dos - SaĂșde Coletiv
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