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Journal of Lipid Research, Vol 33, 1765-1776, Copyright © 1992 by Lipid Research, Inc.
ARTICLES |
KR Feingold, I Staprans, RA Memon, AH Moser, JK Shigenaga, W Doerrler, CA Dinarello and C Grunfeld
Department of Medicine, University of California, San Francisco.
Hyperlipidemia frequently accompanies infectious diseases and may be due to increases in lipoprotein production or decreases in lipoprotein clearance. The administration of endotoxin (LPS) has been used to mimic infection and prior studies demonstrate that LPS produces hypertriglyceridemia. In the present study in rodents, the dose of LPS necessary to induce hyperlipidemia was orders of magnitude less than that necessary to induce shock and death. As little as 10 ng/100 g body weight induced hypertriglyceridemia and this increase in serum triglyceride levels occurred rapidly (78% increase at 2 h). At high doses of LPS (50 micrograms/100 g body weight), the clearance of triglyceride-rich lipoproteins was decreased. At low doses of LPS (100 ng/100 g body weight), triglyceride clearance was not altered but the hepatic secretion of triglyceride was increased. Low dose LPS stimulated hepatic de novo fatty acid synthesis and lipolysis, both of which provided a source of fatty acids for the increase in hepatic triglyceride production. High dose LPS did not increase hepatic fatty acid synthesis or peripheral lipolysis, and hepatic triglyceride secretion was not stimulated. Thus, low dose LPS produces hypertriglyceridemia by increasing hepatic lipoprotein production, while high dose LPS produces hypertriglyceridemia by decreasing lipoprotein catabolism. Administration of anti-tumor necrosis factor (TNF) antibodies or interleukin 1 (IL-1) receptor antagonist did not prevent the increase in serum triglyceride levels induced by LPS. However, anti-TNF antibodies and interleukin 1 receptor antagonist (IL- 1ra) blocked the increase in serum triglycerides induced by TNF or IL- 1, respectively. These data suggest that neither of these cytokines is absolutely required for the increase in serum triglycerides induced by LPS, raising the possibility that other cytokines, small molecular mediators, or LPS itself may play a crucial role.
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