| Texto completo | |
| Autor(es): |
Soares, Edilene Siqueira
;
Padilha Mendonca, Monique Culturato
;
Rocha, Thalita
;
Kalapothakis, Evanguedes
;
da Cruz-Hofling, Maria Alice
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF MOLECULAR NEUROSCIENCE; v. 59, n. 4, p. 452-463, AUG 2016. |
| Citações Web of Science: | 2 |
| Resumo | |
Upregulation of caveolin-3 (Cav-3) or connexin-43 (Cx43) in astrocytes has been associated with important brain pathologies. We used Phoneutria nigriventer spider venom (PNV), which induces blood-brain barrier breakdown in rats, in order to investigate Cav-3 and Cx43 expression in the cerebellum over critical periods of rat envenomation. By immunofluorescence, western blotting (WB), and transmission electron microscopy (TEM), we assessed changes at 1, 2, 5, 24, and 72 h post-venom. WB showed immediate increases in Cav-3 and Cx43 at 1 h (interval of greatest manifestations of envenomation) that persisted at 5 h (when there were signs of recovery) and peaked at 24 h when no signs of envenomation were detectable. At 2 and 72 h, Cav-3 was downregulated and Cx43 had returned to baseline. PNV markedly intensified Cx43 in molecular, Purkinje and granular layers and Cav-3 in astrocytes whose colocalization to increased GFAP suggests interaction between reactive astrogliosis and Cav-3 upregulation. TEM showed swollen perivascular astrocytic end-feet and synaptic contact alterations that had generally resolved by 72 h. It is uncertain whether such PNV-induced synchronized changes are an interactive effect between Cav-3 and Cx43, or a bystander effect. Evidences indicate that Cav-3 downregulation coupled to Cx43 return to baseline at 72 h when no signs of envenomation were visible, suggesting homeostasis reestablishment. This experimental model is relevant to studying mechanisms involved in neurological disorders associated with Cav-3 overexpression. (AU) | |
| Processo FAPESP: | 05/53625-1 - Ação dos mastoparanos e da fosfolipase A2 isolados do veneno de Polybia paulista (Hymenoptera, Epiponini) nos mecanismos de apoptose e necrose de células musculares e mitocôndrias isoladas de camundongos Balb/c |
| Beneficiário: | Maria Alice da Cruz Hofling |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 08/57906-3 - Instituto Nacional de Fotônica Aplicada à Biologia Celular - INFABIC |
| Beneficiário: | Hernandes Faustino de Carvalho |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |