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Endocrinology, Vol 132, 2246-2253, Copyright © 1993 by Endocrine Society

ARTICLES

Tumor necrosis factor mediates the effects of endotoxin on cholesterol and triglyceride metabolism in mice

RA Memon, C Grunfeld, AH Moser and KR Feingold
Department of Medicine, University of California, San Francisco.

The host response to infection is frequently accompanied by changes in cholesterol and triglyceride (TG) metabolism. To determine the role of cytokines in mediating these changes, we studied the effects of endotoxin (LPS), tumor necrosis factor-alpha (TNF) and interleukin-1 beta (IL-1) on cholesterol and TG metabolism in C57Bl/6 (LPS-sensitive) mice and in C3H/HeJ (LPS-resistant) mice whose macrophages do not produce TNF and IL-1 in response to LPS. Sixteen hours after administration, LPS (1 micrograms/mouse) produced a 41% increase in serum cholesterol and a 62% increase in serum TG levels in C57Bl/6 mice whereas a 100-fold higher dose of LPS did not have a significant effect in C3H/HeJ mice. LPS (1 microgram/mouse) also produced a 8.6-fold increase in hepatic cholesterol synthesis and a 2.7-fold increase in hepatic fatty acid synthesis in C57Bl/6 mice but had no effect in C3H/HeJ mice. This suggests that macrophage produced cytokines such as TNF and IL-1 may be involved in mediating these effects of LPS. Additionally, LPS also increased the activity of hydroxy-3- methylglutaryl-coenzyme A (HMG-CoA) reductase, the rate-limiting enzyme in cholesterol synthesis. As seen with LPS, TNF and IL-1 also increased serum cholesterol and TG levels in C57Bl/6 mice. Moreover, TNF and IL-1 produced a 2.3- and 2.1-fold increase in hepatic HMG-CoA reductase activity, respectively. Finally, pretreatment of mice with anti-TNF antibodies, but not with an IL-1 receptor antagonist, blocked the effect of LPS on serum cholesterol and TG levels, hepatic cholesterol and fatty acid synthesis, and hepatic HMG-CoA reductase activity. These results suggest that whereas both TNF and IL-1 mimic the effects of LPS on cholesterol and TG metabolism, TNF may be the in vivo mediator of these late effects of LPS in mice.


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