TRPV1 receptors modulate retinal development


Autoria(s): LEONELLI, Mauro; MARTINS, Daniel O.; BRITTO, Luiz R. G.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

20/10/2012

20/10/2012

2011

Resumo

We investigated the possible participation of TRPV1 channels in retinal apoptosis and overall development. Retinas from newborn, male albino rats were treated in vitro with capsazepine, a TRPV1 antagonist. The expression of cell cycle markers was not changed after TRPV1 blockade, whereas capsazepine reduced the number of apoptotic cells throughout the retina,increased ERK1/2 and p38 phosphorylation and slightly reduced JNK phosphorylation. The expression of BAD, Bcl-2, as well as integral and cleaved capsase-3 were similar in all experimental conditions. Newborn rats were kept for 2 months after receiving high doses of capsazepine. In their retinas, calbindin and parvalbumin protein levels were upregulated, but only the number of amacrine-like, parvalbumin-positive cells was increased. The numbers of calretinin, calbindin, ChAT, vimentin, PKC-alpha and GABA-positive cells were similar in both conditions. Protein expression of synapsin Ib was also increased in the retinas of capsazepine-treated rats. Calretinin, vimentin, GFAP, synapsin Ia, synaptophysin and light neurofilament protein levels were not changed when compared to control values. Our results indicate that TRPV1 channels play a role in the control of the early apoptosis that occur during retinal development, which might be dependent on MAPK signaling. Moreover, it seems that TRPV1 function might be important for neuronal and synaptic maturation in the retina. (C) 2011 ISDN. Published by Elsevier Ltd. All rights reserved.

FAPESP

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

CNPq (Brazil)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Identificador

INTERNATIONAL JOURNAL OF DEVELOPMENTAL NEUROSCIENCE, v.29, n.4, p.405-413, 2011

0736-5748

http://producao.usp.br/handle/BDPI/27905

10.1016/j.ijdevneu.2011.03.002

http://dx.doi.org/10.1016/j.ijdevneu.2011.03.002

Idioma(s)

eng

Publicador

PERGAMON-ELSEVIER SCIENCE LTD

Relação

International Journal of Developmental Neuroscience

Direitos

restrictedAccess

Copyright PERGAMON-ELSEVIER SCIENCE LTD

Palavras-Chave #TRPV1 #Retina #Apoptosis #Development #Mitogen-activated protein kinases #NERVE GROWTH-FACTOR #ACTIVATED PROTEIN-KINASE #GLUTAMATERGIC SYNAPTIC-TRANSMISSION #CALCIUM-BINDING PROTEINS #ROOT GANGLION NEURONS #CELL-DEATH #RAT RETINA #CANNABINOID RECEPTORS #GENE-TRANSCRIPTION #VANILLOID RECEPTOR #Developmental Biology #Neurosciences
Tipo

article

original article

publishedVersion