Diabetes 50:1612-1617, 2001
© 2001 by the American Diabetes Association, Inc.
Effects of Acute Changes of Plasma Free Fatty Acids on Intramyocellular Fat Content and Insulin Resistance in Healthy Subjects
Guenther Boden1,
Brett Lebed1,
Melanie Schatz1,
Carol Homko1, and
Susan Lemieux2
1 Division of Endocrinology/Diabetes/Metabolism, the General Clinical Research Center, and the
2 Department of Radiology, Temple University School of Medicine, Philadelphia, Pennsylvania
The reason for the 3- to 4-h delay between a rise in plasma free fatty acid (FFA) levels and the development of insulin resistance remains unknown. In the current study, we have tested the hypothesis that the delay may be caused by the need for plasma FFAs to first enter muscle cells and to be re-esterified there before causing insulin resistance. To this end, we have determined intramyocellular triglyceride (IMCL-TG) content with proton nuclear magnetic resonance (1H-NMR) spectroscopy in healthy volunteers before and 4 h after lowering of plasma FFAs (with euglycemic-hyperinsulinemic clamping) or after increasing plasma FFAs (with lipid plus heparin infusions). Increasing plasma FFAs (from 516 to 1,207 µmol/l or from 464 to 1,857 µmol/l, respectively) was associated with acute increases in IMCL-TG from 100 to 109 ± 5% (P < 0.05) or to 133 ± 11% (P < 0.01), respectively, and with a significant increase in insulin resistance (P < 0.05 after 3.5 h). Lowering of plasma FFAs from 560 to 41 µmol/l was associated with a tendency for IMCL-TG to decrease (from 100 to 95 ± 3%). Changes in plasma FFAs correlated linearly with IMCL-TG (r = 0.74, P < 0.003). The demonstration that acute changes in plasma FFAs were accompanied by corresponding changes in IMCL-TG and with the development of insulin resistance, taken together with previous reports of a close correlation between IMCL-TG and insulin resistance, supported the notion that accumulation of IMCL-TG is a step in the development of FFA-induced insulin resistance.

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