Overexpressing Human Lipoprotein Lipase in Mouse Skeletal Muscle Is Associated With Insulin Resistance
- University of Colorado Health Sciences Center, Division of Endocrinology, Metabolism and Diabetes, Denver, Colorado
Lipoprotein lipase (LPL) plays a rate-limiting role in triglyceride-rich lipoprotein metabolism and is expressed in most tissues. Overexpression of LPL in skeletal muscle has been linked with higher plasma glucose levels suggesting insulin resistance (Jensen et al., Am J Physiol 273:R683–R689, 1997). The aim of our study was to ascertain whether the overexpression of human LPL in skeletal muscle leads to insulin resistance and to investigate the mechanism. Respiratory quotient measurements in both transgenic (MCKhLPL) and nontransgenic mice on a high-carbohydrate diet were conducted and showed a shift in fuel usage in transgenic mice when fasting but not when actively feeding. An increase in citrate and glucose 6-phosphate levels in fasted MCKhLPL mice further supports this preferential use of lipids. When challenged with an intraperitoneal injection of glucose (1 g/kg), MCKhLPL mice had a higher plasma glycemic excursion than nontransgenic mice. No differences in insulin response were observed between the two groups. Further investigation using hyperinsulinemic-euglycemic clamps revealed insulin resistance in MCKhLPL mice. Despite signs of insulin resistance, there was no associated increase in free fatty acids, hypertriglyceridemia, or hyperinsulinemia in MCKhLPL mice. In conclusion, MCKhLPL mice are insulin resistant, presumably due to increased delivery of lipoprotein-derived fatty acids to muscle.
Address correspondence and reprint requests to Robert Eckel, UCHSC, B-151, 4200 East Ninth Ave., Denver, CO 80262. E-mail:.
Received for publication 18 July 2000 and accepted in revised form 12 January 2001.
FFA, free fatty acid; GIR, glucose infusion rate; LPL, lipoprotein lipase; RQ, respiratory quotient.