Abstract
Effects of peripheral administration of melanotan II (MTII), a melanocortin agonist, on insulin sensitivity and glucose tolerance were examined in Otsuka Long-Evans Tokushima Fatty (OLETF) rats. Subcutaneous administration of MTII with osmotic mini-pumps decreased food intake and body weight in OLETF rats. MTII group showed more sensitivity to insulin compared with that allowed to eat ad libitum or pair-fed group in insulin tolerance tests on day 9. MTII group also showed significantly lower glucose values than ad libitum group in glucose tolerance tests on days 11 and 23. Thus, MTII increased insulin sensitivity and improved glucose tolerance in OLETF rats.
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