Effects of Insulin and Adrenalectomy on Elevation of Serum Leptin Levels Induced by 5-Hydroxytryptophan in Mice

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We previously reported that a serotonin precursor 5-hydroxytryptophan (5-HTP) increases serum leptin levels in mice. In this study, we studied the effects of insulin and adrenalectomy on hyperleptinemia induced by 5-HTP. Co-administration of insulin significantly increased hyperleptinemia elicited by 5-HTP. 5-HTP itself increased serum insulin levels. Adrenalectomy, which depletes corticosterone, did not abolish hyperleptinemic effects of 5-HTP. These results suggest that insulin may participate in hyperleptinemic effects of 5-HTP and that the involvement of corticosterone in effects of 5-HTP may be probably small.

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