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Diabetes 52:260-267, 2003
© 2003 by the American Diabetes Association, Inc.

Effects of Free Fatty Acids Per Se on Glucose Production, Gluconeogenesis, and Glycogenolysis

Peter Staehr1, Ole Hother-Nielsen1, Bernard R. Landau2, Visvanathan Chandramouli2, Jens Juul Holst3, and Henning Beck-Nielsen1

1 Medical Department M, Odense University Hospital, Odense, Denmark
2 Departments of Medicine and Biochemistry, Case Western Reserve University, Cleveland, Ohio
3 Department of Medical Physiology, Panum Institute, University of Copenhagen, Copenhagen, Denmark

Insulin-independent effects of a physiological increase in free fatty acid (FFA) levels on fasting glucose production, gluconeogenesis, and glycogenolysis were assessed by administering [6,6-2H2]-glucose and deuteriated water (2H2O) in 12 type 1 diabetic patients, during 6-h infusions of either saline or a lipid emulsion. Insulin was either fully replaced (euglycemic group, n = 6), or underreplaced (hyperglycemic group, n = 6). During saline infusions, plasma FFA levels remained unchanged. Glucose concentrations decreased from 6.7 ± 0.4 to 5.3 ± 0.4 mmol/l and 11.9 ± 1.0 to 10.5 ± 1.0 mmol/l in the euglycemic and hyperglycemic group, respectively. Accordingly, glucose production declined from 84 ± 5 to 63 ± 5 mg · m-2 · min-1 and from 84 ± 5 to 68 ± 4 mg · m-2 · min-1, due to declining rates of glycogenolysis but unaltered rates of gluconeogenesis. During lipid infusions, plasma FFA levels increased twofold. In the euglycemic group, plasma glucose increased from 6.8 ± 0.3 to 7.8 ± 0.8 mmol/l. Glucose production declined less in the lipid study than in the saline study due to a stimulation of gluconeogenesis by 6 ± 1 mg · m-2 · min-1 and a decline in glycogenolysis that was 6 ± 2 mg · m-2 · min-1 less in the lipid study than in the saline study. In contrast, in the hyperglycemic group, there were no significant effects of elevated FFA on glucose production, gluconeogenesis, or glycogenolysis. In conclusion, a physiological elevation of plasma FFA levels stimulates glycogenolysis as well as gluconeogenesis and causes mild fasting hyperglycemia. These effects of FFA appear attenuated in the presence of hyperglycemia.


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