Central but not peripheral glucoprivation is impaired in monosodium glutamate-treated rats

Central but not peripheral glucoprivation is impaired in monosodium glutamate-treated rats

Autor Andrade, I. S. de Google Scholar
Gonzalez, JCG Google Scholar
Hirata, A. E. Google Scholar
Carneiro, G. Google Scholar
Amado, D. Google Scholar
Cavalheiro, E. A. Google Scholar
Dolnikoff, M. S. Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Resumo In the present study, newborn male Wistar rats were injected, subcutaneously, five times, every other day, with monosodium glutamate (MSG, 4 g/kg bw) or saline (as control, C), during the neonatal period. MSG animals developed destruction of the arcuate nuclei (ARC) with absence of NPY-immunoreactive cell bodies, which impaired both the food intake (baseline) and the 2-deoxy-D-glucose (2DG) glucoprivic feeding response. Increases in the immunoreactivity of corticotropin-releasing hormone-cell bodies in the paraventricular nuclei might have developed to compensate for the atrophy of the pituitary in MSG-treated rats. After systemic 2DG injection, neither the C nor the MSG rats increased their food intake, but they showed similar hyperglycemic responses, whereas plasma free fatty acids (FFA) increased only in the C group. in other groups, 2DG, norepinephrine (NE), neostigmine (NEO) and saline were intracerebroventricularly (i.c.v.) administered. in this condition, impairment of the hyperglycemic and food intake responses, associated to a lower increase in plasma FFA levels, were observed. As opposed to this, the MSG treatment gives support to NE effects, enhancing food intake, as well as plasma glucose and FFA levels. After NEO, plasma glucose increased only in the MSG group, while plasma FFA levels were elevated in the C rats. Taken together, the results obtained after MSG treatment point to a separate neural control of the hyperglycemic response and of the lipid mobilization when stimulated by central 2DG, NE or NEO administration. It seems likely that the excitatory neural pathway that controls lipid metabolism and is present in C rats was destroyed by the MSG treatment. (C) 2005 Elsevier Ireland Ltd. All rights reserved.
Palavra-chave 2-deoxy-D-glucose
food intake
monosodium glutamate
plasma free fatty acids
Idioma Inglês
Data de publicação 2006-05-01
Publicado em Neuroscience Letters. Clare: Elsevier B.V., v. 398, n. 1-2, p. 6-11, 2006.
ISSN 0304-3940 (Sherpa/Romeo, fator de impacto)
Publicador Elsevier B.V.
Extensão 6-11
Fonte http://dx.doi.org/10.1016/j.neulet.2005.12.043
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000236914500002
Endereço permanente http://repositorio.unifesp.br/handle/11600/28888

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