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1 Department of Nutritional Sciences, University of California, Berkeley, 94720-3104; and 2 Division of Endocrinology and Metabolism, Department of Medicine, University of California, San Francisco, California 94110
Chronic nicotinic acid (NA) ingestion effectively lowers lipid levels, but adverse effects on glucose metabolism have been reported. Our goal was to investigate acute and chronic effects of NA on lipolysis and glucose metabolism in women. Healthy normolipidemic volunteers (n = 5) were studied twice; four-day hospital stays were separated by 1 mo, during which time subjects took increasing doses of NA to 2 g/day (500 mg, 4 times). In the second study, 500 mg of NA was given at 0800. Rates of appearance (Ra) of free fatty acid (FFA), glycerol, and glucose were determined by isotope dilution (of [1,2,3,4-13C4]palmitate, [2-13C1]glycerol, and [U-13C6]glucose). Mass isotopomer distribution analysis was used to measure gluconeogenesis and glycogenolysis. Fasting FFA concentrations ([FFA]), Ra FFA, and Ra glycerol were nonsignificantly elevated after 1 mo. Acute NA induced a significant reduction followed by a rebound overshoot of [FFA], Ra FFA, and Ra glycerol. Whole body fat oxidation fell initially and then increased back to basal levels; endogenous glucose production (EGP) increased in parallel with carbohydrate oxidation and then returned to basal values. The increased EGP was due entirely to increased glycogenolysis, not gluconeogenesis. We conclude that chronic effects of NA on FFA metabolism are complex (acute suppression followed by overshoot of Ra FFA and [FFA] on top of a trend toward basal elevations), that responses after NA are consistent with operation of a glucose-fatty acid cycle in peripheral tissues, and that secondary effects on EGP were through changes in glycogenolysis, not gluconeogenesis.
glycogenolysis; gluconeogenesis; Randle cycle; mass isotopomer distribution analysis; lipolysis
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