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Division of Endocrinology, University of Colorado Health Sciences Center, Denver 80262.
Eight normal-weight subjects (four men, four women) were studied to determine the relative activities of lipoprotein lipase (LPL) in adipose tissue (ATLPL) and vastus lateralis skeletal muscle (SMLPL), both in the fasting state and in response to a 6-hour insulin/glucose infusion. Mean fasting levels of ATLPL and SMLPL were not statistically different. After 6 hours of insulin/glucose infusion, mean ATLPL activity was significantly greater than the fasting level (P less than .01), while mean SMLPL activity decreased from basal (P less than .05). These tissue-specific changes in LPL responsiveness (0 to 6 hours) were significantly different (P less than .01). No differences between men and women were observed. These divergent tissue-specific LPL responses to insulin/glucose would serve to direct lipoprotein triglyceride-derived fatty acids away from muscle and to adipose tissue for storage.
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