Effect of glyburide on beta cell responsiveness to glucose in non-insulin-dependent diabetes mellitus

The American Journal of Medicine
N M O'MearaK S Polonsky

Abstract

Since the introduction of glyburide in 1984, many studies have evaluated the effects of this oral hypoglycemic agent on beta cell function in patients with non-insulin-dependent diabetes mellitus. The early studies, which were performed in patients receiving concomitant insulin therapy, may have underestimated the true effect of glyburide on insulin secretion. The more recent studies demonstrate that both short- and long-term glyburide therapy increase C-peptide levels in diabetic as well as nondiabetic subjects and that the effects of glyburide are comparable to those of the other second-generation sulfonylurea, glipizide. The effects of glyburide on insulin secretory rates calculated from plasma C-peptide levels were recently evaluated using individually derived C-peptide kinetic parameters and a validated open two-compartment model of peripheral C-peptide kinetics. Glyburide did not influence fasting insulin secretion (196 +/- 34 versus 216 +/- 23 pmol/min) but did cause an increase in the total amount of insulin secreted over a 24-hour period (447 +/- 58 versus 561 +/- 55 nmol). This increase in the production of insulin was generated by an increase in amplitude of secretory pulses occurring after lunch and dinner rather th...Continue Reading

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