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The purposes of this study were to determine whether patients with non-insulin-dependent diabetes mellitus (NIDDM) have an enhanced glycemic response to epinephrine (EPI) and to quantitate the effect of physiological elevations of EPI on pancreatic islet function in these patients. The increment of plasma glucose (PG) in response to 45 min of EPI infusion (mean plasma EPI 2490 pM) was more than twofold greater in nine NIDDM patients than in 20 nondiabetic control subjects (mean +/- SE delta PG 3.9 +/- 0.3 vs. 1.7 +/- 0.1 mM, P less than 0.0001). The effects of EPI on beta-cell and alpha-cell function were compared in nine NIDDM patients and 9 age- and weight-matched control subjects during infusions of saline or two doses of EPI on separate days (mean plasma EPI 270, 1120, and 2490 pM). On each day, the acute insulin response (AIR) and acute glucagon response (AGR) to 5 g i.v. arginine were measured at three matched steady-state PG levels (means of 9, 14, and 29 mM). Beta-Cell sensitivity to glucose (slope of glucose potentiation) and beta-cell secretory capacity, or AIRmax (AIR at the highest clamped PG level), were calculated. In control subjects, EPI inhibited the AIR at PG concentrations of 9 and 14 mM (both P less than 0.05) but had no effect on the AIRmax, resulting in a rightward shift of the curve relating the AIR and PG and a decrease in the slope of glucose potentiation (P less than 0.01). In contrast in NIDDM patients, EPI inhibited the AIR at all PG levels, including the AIRmax (all P less than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)
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