Thirty two synthetic tripeptides structurally related both to thyrotropin releasing hormone (TRH) and anorexogenic tripeptide (Glp-His-Gly-OH) were investigated for anorexogenic effect in rats. While the two endogenous peptides, TRH and Glp-His-Gly-OH, were ineffective in rats deprived of food for 96 hours when they were administered intracerebroventricularly, some of the synthetic analogues showed significant food intake reducing effect under the same conditions. This anorexogenic effect of the tripeptides is similar--though much weaker--to that of satietin, a highly potent anorexogenic glycopeptide in human and mammalian serum. These tripeptides were ineffective when they were administered intravenously.
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