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To further clarify the relationship between insulin and leptin, time course changes in plasma glucose, serum insulin and leptin levels were analyzed after subcutaneous administration of 100 microg octreotide acetate in two insulinoma subjects. Octreotide acetate induced a prompt decrease in serum insulin level, accompanied with an increase in plasma glucose in both patients. Following the decrease in serum insulin level, serum leptin concentrations were profoundly decreased by 66% and 44%, 8-12 hrs after octreotide injection; that is, the concentrations decreased from 41.1 to 13.8 ng/ml in patient 1, and from 17.5 to 9.8 ng/ml in patient 2. Daily profiles of plasma glucose, serum insulin and leptin without octreotide administration did not show such alterations in these indexes in patient 1. These data show that circulating leptin may be susceptible to decline dependent on the decrease in serum insulin, suggesting that insulin plays a crucial role in the maintenance of leptin secretion in humans.

Crucial Role of Insulin in Leptin Maintenance. Profound Decrease in Serum Leptin by Octreotide Acetate in Insulinoma Subjects.