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Endocrinology, Vol 124, 2336-2342, Copyright © 1989 by Endocrine Society

ARTICLES

Tumor necrosis factor stimulates hepatic lipid synthesis and secretion

KR Feingold, MK Serio, S Adi, AH Moser and C Grunfeld
Department of Medicine, University of California, San Francisco.

Previous studies have shown that tumor necrosis factor (TNF) administration acutely increases serum triglyceride levels and stimulates hepatic de novo fatty acid synthesis. We now demonstrate that 60-90 min after TNF administration the incorporation of glycerol into triglycerides in the liver is increased 57% in chow-fed rats. Additionally, the quantity of labeled lipid in serum is increased 96% in the TNF-treated animals. TNF also acutely increases hepatic lipid synthesis and the quantity of labeled lipids in serum in rats fed a high sucrose diet. Moreover, using the Triton WR-1339 method, from 1-2 h after TNF administration there is a 52% increase in total hepatic triglyceride secretion. In contrast, in animals fasted before TNF administration, the characteristic increase in serum triglyceride levels is not observed, and neither the incorporation of glycerol into hepatic lipids nor the quantity of labeled lipids in the circulation are increased. By 17 h after TNF administration the incorporation of glycerol into hepatic lipid and the quantity of labeled lipid in the serum are no longer increased. These results indicate that in addition to TNF acutely stimulating de novo fatty acid synthesis, TNF also acutely stimulates hepatic triglyceride synthesis. The increase in hepatic triglyceride synthesis leads to increased secretion of lipids into the circulation. These observations provide strong support for our hypothesis that a TNF-induced stimulation of hepatic lipid synthesis and secretion contributes to the TNF-induced hyperlipidemia.


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