Diabetes, Vol 46, Issue 1 153-157, Copyright © 1997 by American Diabetes Association

ARTICLES

Induction of hepatic glucose-6-phosphatase gene expression by lipid infusion

D Massillon, N Barzilai, M Hawkins, D Prus-Wertheimer and L Rossetti
Diabetes Research and Training Center, Albert Einstein College of Medicine, Bronx, New York 10461, USA.

The distal enzymatic step in the process of glucose output is catalyzed by the glucose-6-phosphatase (Glc-6-Pase) complex. The recently cloned catalytic unit of this complex has been shown to be regulated by insulin, dexamethasone, cAMP, and glucose. Using a combination of intralipid and/or nicotinic acid infusions and a pancreatic clamp technique, we maintained plasma free fatty acids (FFAs) at three different levels (0.26 +/- 0.07, 0.56 +/- 0.09, and 1.59 +/- 0.12 mmol/l) in the presence of well-controlled hormonal and metabolic conditions. An increase in the plasma FFA concentration within the physiological range caused a rapid, greater than threefold increase in the mRNA and protein levels of the catalytic subunit of Glc-6-Pase in the liver. These data indicate that the in vivo gene expression of Glc-6-Pase in the liver is regulated by circulating lipids independent of insulin and thus that prolonged hyperlipidemia may contribute to the increased production of glucose via increased expression of this protein.
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