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Diabetes, Vol 44, Issue 10 1239-1242, Copyright © 1995 by American Diabetes Association

ARTICLES

Effects of a 48-h fat infusion on insulin secretion and glucose utilization

G Boden, X Chen, J Rosner and M Barton
Division of Endocrinology and Metabolism, Temple University School of Medicine, Philadelphia, Pennsylvania, USA.

To determine the effects of prolonged elevation of plasma free fatty acids (FFAs) on insulin secretion, we infused Liposyn II (4.3 mumol.kg-1.min-1) plus heparin (0.4 U.kg-1.min-1) intravenously into six healthy volunteers for 48 h. Another six volunteers received saline infusions and served as control subjects. In all 12 subjects (11 men and 1 woman), plasma glucose was clamped at approximately 8.6 mmol/l. Liposyn/heparin infusion resulted in a 9.4-fold increase in plasma FFA concentration (from 132 to 1,237 mumol/l), a 46% increase in insulin secretion rates (from 241 to 352 pmol/min, P < 0.05) (determined by deconvolution of plasma C-peptide concentration), and a 30% decrease, during the initial 24 h, in the rate of glucose infusion needed to maintain hyperglycemia (from 55.5 to 39.1 mumol.kg-1.min-1, P < 0.02). This decrease disappeared during the second 24 h. In summary, we found that physiologically elevated plasma FFAs 1) potentiated glucose-stimulated insulin secretion for 48 h and 2) initially caused peripheral insulin resistance that disappeared during the 2nd day, probably as a result of elevated circulating insulin levels. We conclude that in healthy volunteers under hyperglycemic conditions, fat infusion produced insulin resistance that was compensated for after approximately 24 h by persistent hypersecretion of insulin.
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