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Journal Article
Research Support, Non-U.S. Gov't
Hyperinsulinemia of the genetically obese (fa/fa) rat is decreased by a low dose of the 5-HT1A receptor agonist 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT).
European Journal of Pharmacology 1988 Februrary 17
Changes in glycemia and insulinemia were determined in conscious lean (FA/?) and obese (fa/fa) rats after acute administration of the 5-HT1A receptor agonist 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT). The intravenous injection of a low dose of 8-OH-DPAT (150 micrograms/kg) to lean rats rapidly promoted hyperglycemia. This modification was associated with a slight increase in insulinemia. The injection of 8-OH-DPAT markedly decreased basal hyperinsulinemia in obese rats while inducing hyperglycemia. Further evidence of the strong inhibitory effect of 8-OH-DPAT on insulin release was obtained in lean and obese rats during glucose tolerance tests. Intracerebroventricular injection of 8-OH-DPAT (45 micrograms/animal) triggered hyperglycemia and markedly decreased insulinemia in both lean and obese rats. This hypoinsulinemic effect of 8-OH-DPAT was more pronounced in the obese than in the lean animals. Measurement of the food intake elicited by 8-OH-DPAT (500 micrograms/kg s.c.) showed that the hyperphagic action of the 5-HT1A agonist was the same in FA/? and fa/fa rats. It is suggested that: (i) hyperinsulinemia of the genetically obese rat may be diminished by a low dose of 8-OH-DPAT; (ii) 5-HT1A autoreceptor-mediated regulation of serotonergic activity is not different in lean (FA/?) and obese (fa/fa) rats; (iii) 8-OH-DPAT could be of potential therapeutic use for some aspects of the pathology of type II diabetes.
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