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(Arteriosclerosis, Thrombosis, and Vascular Biology. 1995;15:1688-1694.)
© 1995 American Heart Association, Inc.

Articles

Overexpression of Human Lipoprotein Lipase Protects Diabetic Transgenic Mice From Diabetic Hypertriglyceridemia and Hypercholesterolemia

Masako Shimada; Shun Ishibashi; Takanari Gotoda; Masako Kawamura; Koji Yamamoto; Toshimori Inaba; Kenji Harada; Junichi Ohsuga; Stephane Perrey; Yoshio Yazaki; Nobuhiro Yamada

From the Third Department of Internal Medicine, University of Tokyo, Hongo, Tokyo, Japan.

Correspondence to Nobuhiro Yamada, Third Department of Internal Medicine, University of Tokyo, Hongo, Tokyo, Japan, 113.

Abstract We investigated the role of the overexpression of lipoprotein lipase (LPL) in lipoprotein abnormalities in transgenic mice with streptozotocin-induced diabetes mellitus. Before the induction of diabetes, LPL activity was 4.6-fold in skeletal muscle and 2.0-fold higher in the heart in transgenic mice than in their nontransgenic littermates. LPL activity in skeletal muscles in diabetic nontransgenic mice and cardiac LPL activity in diabetic nontransgenic and transgenic mice were decreased. Body weights were similarly reduced, and no appreciable amount of adipose tissue was observed in diabetes in both groups. The plasma triglyceride level was lower in diabetic transgenic mice than in diabetic nontransgenic mice (33.2±22.5 versus 185.3±57.4 mg/dL). Induction of diabetes was associated with a significant increase in the plasma cholesterol level in nontransgenic mice (90.0±11.1 versus 163.9±39.3 mg/dL) but much less in transgenic mice. Our results indicate that overexpression of LPL in transgenic mice inhibited diabetes-associated hypertriglyceridemia and hypercholesterolemia but did not affect the loss of body weight induced by diabetes.

Key Words: diabetes mellitus • insulin • body weight • triglycerides • cholesterol

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