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Hepatic triglyceride (HTGL) and lipoprotein lipase (LPL) probably have major roles in the removal of triglyceride from triglyceride-rich lipoprotein and in the formation of high density lipoprotein (HDL). However, no population-based study of their activity and relationship to lipoprotein lipid levels has been reported. To determine these relationships, we recalled 33 men and 17 women of a randomly selected sample of the Lipid Research Clinics Pacific Northwest Bell Telephone Company Health Survey. The subjects were 53 +/- 7 years old (mean +/- SD) with total triglyceride levels of 120 +/- 57 mg/dl and total cholesterol levels of 224 +/- 35 mg/dl. Postheparin plasma LPL activity (127 +/- 61 nmol/min/ml) was not significantly correlated with either age, sex, or adiposity. In contrast, HTGL activity was significantly higher in men (235 +/- 84 nmol/min/ml) than women (170 +/- 91 nmol/min/ml, p less than 0.02), and was correlated with age in men and with adiposity in women. In both men and women, HTGL activity was related positively with VLDL triglyceride and inversely with HDL2 cholesterol. When the association between HTGL activity and VLDL triglyceride was examined with values from men and women pooled, the relationship was not weakened after adjustment for the linear effect of sex, adiposity, LPL, or HDL2 cholesterol.
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