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Doctoral Thesis
DOI
https://doi.org/10.11606/T.42.2011.tde-22072011-131242
Document
Author
Full name
Mauro Leonelli
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2011
Supervisor
Committee
Britto, Luiz Roberto Giorgetti de (President)
Gardino, Patricia Franca
Hamassaki, Dania Emi
Rocha, Luiz Carlos de Sá
Scavone, Cristoforo
Title in Portuguese
Receptores vanilóides TRPV1 na retina.
Keywords in Portuguese
Células do gânglio retiniano
Nervo óptico
Óxido nítrico
Retina
Abstract in Portuguese
A expressão do receptor de potencial receptor transiente, vanilóide 1 (TRPV1) começa desde estágios pré-sinaptogênicos da retina. O bloqueio farmacológico desse receptor nesse período diminui a apoptose fisiológica, havendo possível envolvimento da sinalização de MAP quinases. Na retina do animal adulto, observamos que a expressão de TRPV1 é amplamente difundida, albergando neurônios, células endoteliais e células da microglia. A ativação dos receptores TRPV1 é potencialmente citotóxica, e os mecanismos que podem estar envolvidos incluem a liberação de glutamato, a excitotoxicidade e o estresse nitrosativo. Evidenciamos que a lesão prévia de células ganglionares sensibiliza o tecido retiniano à citotoxicidade mediada pela estimulação de TRPV1. Porém, o bloqueio de TRPV1, tanto in vivo quanto in vitro, não inibiu a morte de células ganglionares axotomizadas. Esses dados sugerem que o receptor TRPV1 participa da modulação de diversos processos fisiopatológicos na retina.
Title in English
Vanilloid TRPV1 receptors in the rat retina.
Keywords in English
Nitric oxide
Optic nerve
Retina
Retinal ganglion cells
Abstract in English
TRPV1 expression in the developing retina begins before retinal sinaptogenesis. TRPV1 blockade reduced the normal apoptosis in this period, and MAPK signaling seems to be involved in this process. In the adult retina, TRPV1 are expressed in neuronal, endothelial and microglial cells. The activation of those receptors is potentially cytotoxic, and glutamate release and further excitotoxicity and nitrosative stress might be also involved. Axotomized retinal ganglion cells were sensitized to TRPV1 citotoxicity, but TRPV1 antagonism, both in vitro and in vivo, did not reduce the loss of ganglion cell after axotomy. Our results suggest that TRPV1 receptors are involved in synaptic function and homeostatic control in the retina. Moreover, TRPV1 seems to be indirectly involved in cellular degeneration that follows the section of retinal ganglion cell axons.
 
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Publishing Date
2011-08-24
 
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