MSG lesions decrease body mass of suckling-age rats by attenuating circadian decreases of energy expenditure.
Am J Physiol Endocrinol Metab
; 283(3): E604-11, 2002 Sep.
Article
em En
| MEDLINE
| ID: mdl-12169455
ABSTRACT
Suckling-age rats display endogenous circadian rhythmicity of metabolic rate (MR) with energy-saving, torpor-like decreases, which are sympathetically controlled and suppressed by leptin treatment. We investigated whether neonatal monosodium glutamate (MSG) treatment, known to cause arcuate nucleus damage and adult-age obesity, alters energy balance in the first two postnatal weeks. Continuously recorded MR and core temperatures (T(c)) show that MSG treatment disinhibits the periodic, sympathetically controlled, energy-saving drops of T(c) and MR. Increased energy expenditure thus explains reduced body fat at normal lean body mass found in MSG-treated pups artificially nourished identically to controls. In MSG-treated mother-reared pups, lean body mass is additionally reduced, suggesting that MSG also reduces suckling. Plasma leptin levels are similar in controls and MSG-treated pups but higher per unit of fat mass in the latter. We conclude that the postweaning development of MSG obesity and depressed thermogenesis are preceded by an early phase of increased energy expenditure with decreased fat deposition during suckling age and hypothesize cell damage in the arcuate nucleus to be involved in both.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Glutamato de Sódio
/
Peso Corporal
/
Ritmo Circadiano
/
Metabolismo Energético
/
Animais Lactentes
Tipo de estudo:
Health_economic_evaluation
Limite:
Animals
Idioma:
En
Ano de publicação:
2002
Tipo de documento:
Article