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Research Article Free access | 10.1172/JCI114937

Metabolic effects of cachectin/tumor necrosis factor are modified by site of production. Cachectin/tumor necrosis factor-secreting tumor in skeletal muscle induces chronic cachexia, while implantation in brain induces predominantly acute anorexia.

K J Tracey, S Morgello, B Koplin, T J Fahey 3rd, J Fox, A Aledo, K R Manogue, and A Cerami

Laboratory of Medical Biochemistry, Rockefeller University, New York, New York.

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Laboratory of Medical Biochemistry, Rockefeller University, New York, New York.

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Laboratory of Medical Biochemistry, Rockefeller University, New York, New York.

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Laboratory of Medical Biochemistry, Rockefeller University, New York, New York.

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Laboratory of Medical Biochemistry, Rockefeller University, New York, New York.

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Laboratory of Medical Biochemistry, Rockefeller University, New York, New York.

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Laboratory of Medical Biochemistry, Rockefeller University, New York, New York.

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Laboratory of Medical Biochemistry, Rockefeller University, New York, New York.

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Published December 1, 1990 - More info

Published in Volume 86, Issue 6 on December 1, 1990
J Clin Invest. 1990;86(6):2014–2024. https://doi.org/10.1172/JCI114937.
© 1990 The American Society for Clinical Investigation
Published December 1, 1990 - Version history
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Abstract

We have developed a murine model of wasting by injecting intracerebrally cells which continuously secrete h-cachectin/TNF (CHO-TNF) to: (a) determine the effects of cachectin/TNF produced continuously in the central nervous system (CNS), and (b) compare the metabolic effects of cachectin/TNF-secreting tumor in the brain to the cachexia caused by CHO-TNF tumor in peripheral tissue (IM). Intracerebral CHO-TNF tumors produced increased serum h-cachectin/TNF levels with lethal hypophagia and weight loss (mean survival time of 11 d); these changes were not observed in association with nonsecretory control brain tumors. The metabolic consequences of intracerebral cachectin/TNF production were indistinguishable from acute, lethal starvation: whole-body lipid content was decreased significantly but protein was conserved. Although intramuscular cachectin/TNF-secreting tumors caused similar increases of serum h-cachectin/TNF levels, profound anorexia did not develop; wasting developed after a longer period of tumor burden (50 d) with classical signs of cachexia (i.e., anemia and depletion of both protein and lipid). These studies provide a reproducible animal model of site-specific cytokine production and suggest that, regardless of serum levels, cachectin/TNF produced locally in brain influences both the rate of development of wasting and its net metabolic effects.

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