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Effects of L-lysine deficient diet on the hypothalamic interstitial norepinephrine and diet-induced thermogenesis in rats in vivo


Effects of L-lysine deficient diet on the hypothalamic interstitial norepinephrine and diet-induced thermogenesis in rats in vivo



Biofactors 12(1-4): 137-142



ISSN/ISBN: 0951-6433

PMID: 11216475

Rats readily recognize an amino acid deficient diet, presumably via central mechanisms that involve hypothalamic circuits. Presently, effects of the essential amino acid L-lysine deficiency on the ventromedial (VMH) and lateral (LH) hypothalamus norepinephrine (NE) release were evaluated in free moving rats. Microdialysis measurement was undertaken once in 48 h (12:00 noon-14:00) in rats that had free access to food and drink. Significant decline in the food intake and VMH NE release were found in rats fed L-lysine diet. No changes were identified in LH NE release. Additionally, no significant differences in diet-induced spatial thermogenesis between normal and L-lysine deficient non-stressed rats were found in vivo. The results suggested that the VMH NE release was specifically involved in the integration of signals about amino acid deficiency. However, the decrease in VMH NE was not translated into changes of thermogenic responses to diet.

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Accession: 045900628

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