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18 September 2001 | Volume 135 Issue 6 | Pages 447-459
Abnormalities in insulin and glucose metabolism do not seem to entirely account for the high frequency of cardiovascular disease in patients with type 2 diabetes mellitus. An important additional factor may be hypertriglyceridemic hyperapoB, an atherogenic dyslipoproteinemia that is common in these patients. The major features of hypertriglyceridemic hyperapoB are hypertriglyceridemia; low levels of high-density lipoprotein cholesterol; and increased numbers of small, dense low-density lipoprotein (LDL) particles. This article reviews the pathophysiology of this disorder, focusing on the changes in lipoprotein particle number and composition rather than lipoprotein lipid levels. The in vitro and in vivo evidence that small, dense LDL are more atherogenic than normal larger, buoyant LDL is summarized, and the particularly high-risk state conferred by increased numbers of small, dense LDL is delineated. This review demonstrates how abnormalities in the plasma lipoproteins may relate to the effectiveness with which adipose tissue traps and retains fatty acid. The effects of increased fatty acid flux on the hepatic metabolism of lipids and apoB secretion are detailed, and the mechanisms by which fibrates and statins may improve these are described. An understanding of these principles should provide the physician with a more physiologic basis on which to choose appropriate therapy.
Author and Article Information
From McGill University Health Centre, McGill University, and Concordia University, Montreal, Quebec, Canada.
Acknowledgments: The authors thank Dr. J. Wiseman, an academic clinical internist, for encouragement and support.
Grant Support: By grant MT-5480 from the Medical Research Council of Canada (Dr. Sniderman). Ms. Scantlebury is a recipient of the Medical Research Council of Canada Doctoral Research Award (9810DRN-1414-58633). Dr. Cianflone is a recipient of a scholarship from the Fonds de la Recherche en Santé du Québec.
Requests for Single Reprints: Allan D. Sniderman, MD, Mike Rosenbloom Laboratory for Cardiovascular Research, Room H7.22, McGill University Health Centre, Royal Victoria Hospital, 687 Pine Avenue West, Montreal, Quebec H3A 1A1, Canada; e-mail, allan.sniderman{at}muhc.mcgill.ca.
Current Author Addresses: Dr. Sniderman: Mike Rosenbloom Laboratory for Cardiovascular Research, Room H7.22, McGill University Health Centre, Royal Victoria Hospital, 687 Pine Avenue West, Montreal, Quebec H3A 1A1, Canada.
Ms. Scantlebury and Dr. Cianflone: Royal Victoria Hospital, 687 Pine Avenue West, Montreal, Quebec H3A 1A1, Canada. UPDATE
Hypertriglyceridemic HyperapoB: The Unappreciated Atherogenic Dyslipoproteinemia in Type 2 Diabetes Mellitus
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