Physiol Behav. 1991 Aug;50(2):385-8.

The influence of semistarvation-induced hyperactivity on hypothalamic serotonin metabolism.

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Division of Psychoneuroendocrinology, Max Planck Institut for Psychiatry, München, F.R. Germany.

Abstract

Male rats kept in a running wheel developed hyperactivity when food was restricted. Highest activity occurred around noon when food was given. Semistarved sedentary and ad lib fed sedentary and running rats served as controls. Five-hydroxyindole-acetic acid (5-HIAA) in the medial basal hypothalamus was lowest in the sedentary ad lib fed group. Running significantly increased 5-HIAA. Starvation likewise increased 5-HIAA. This effect was further enhanced by hyperactivity. When the circadian rhythm of serotonin (5-HT) and 5-HIAA was studied in the hypothalamus, a minimum of 5-HT as seen in semistarved sedentary and running rats around feeding time (noon). At this time 5-HIAA reached a maximum in the semistarved running rats while semistarved sedentary and ad lib fed rats showed no circadian pattern of 5-HIAA. These data indicate that serotonin turnover in the medial basal hypothalamus is increased as a consequence of semistarvation and hyperactivity.

PMID:: 1720894; [PubMed - indexed for MEDLINE]

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The influence of semistarvation-induced hyperactivity on hypothalamic serotonin metabolism.

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