Arginine-induced insulin secretion was evaluated in 13 patients with endogenous hypertriglyceridemia (Fredrickson's Type IV) before and after a two-month period of Clofibrate therapy. Clofibrate reduced triglyceride, cholesterol and FFA levels by 68, 28 and 15% respectively and provoked a significant reduction in arginine-induced insulin secretion without modifying glucose response. Arginine-induced insulin secretion was also studied in 11 normal subjects during saline and intralipid infusions. Glucose and insulin basal values, and glucose and insulin response to arginine infusion were not influenced by Intralipid infusion in these controls. These results confirm that clofibrate reduces insulin secretion thereby contributing to decreased serum triglyceride levels.
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