1 resultado para Eye enucleation
em Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (BDPI/USP)
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Resumo:
Redox processes associated with controlled generation of reactive oxygen species (ROS) by NADPH oxidase (Nox) add an essential level of regulation to signaling pathways underlying physiological processes. We evaluated the ROS generation in the main visual relays of the mammalian brain, namely the superior colliculus (SC) and the dorsal lateral geniculate nucleus (DLG), after ocular enucleation in adult rats. Dihydroethidium (DHE) oxidation revealed increased ROS generation in SC and DLG between 1 and 30 days postlesion. ROS generation was decreased by the Nox inhibitors diphenyleneiodonium chloride (DPI) and apocynin. Real-time PCR results revealed that Nox 2 was upregulated in both retinorecipient structures after deafferentation, whereas Nox 1 and Nox 4 were upregulated only in the SC. To evaluate the role of ROS in structural remodeling after the lesions, apocynin was given to enucleated rats and immunohistochemistry was conducted for markers of neuronal remodeling into SC and DLG. Immunohistochemical data showed that ocular enucleation produces an increase of neurofilament and microtubule-associated protein-2 immunostaining in both SC and DLG, which was markedly attenuated by apocynin treatment. Taken together, the findings of the present study suggest a novel role for Nox-induced ROS signaling in mediating neuronal remodeling in visual areas after ocular enucleation. (C) 2010 IBRO. Published by Elsevier Ltd. All rights reserved.