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From * The Surgical Metabolism Section, Surgery Branch, National Cancer Institute, National
Institutes of Health, Bethesda, Maryland 20892; and Several inflammatory cytokines, most notably tumor necrosis factor (TNF) and IL-1, induce
anorexia and loss of lean body mass, common manifestations of acute and chronic inflammatory conditions. In C57BL/6 female mice, the administration of TNF, IL-1, and, to a lesser extent, leukemia inhibitory factor (LIF), produced a prompt and dose-dependent increase in serum leptin levels and leptin mRNA expression in fat. IL-10, IL-4, ciliary neurotrophic factor,
and IL-2, cytokines not known to induce anorexia or decrease food intake, had no effect on
leptin gene expression or serum leptin levels. After administration of Escherichia coli lipopolysaccharide (LPS), leptin gene expression and leptin levels were increased. These findings suggest
that leptin levels may be one mechanism by which anorexia is induced during acute inflammatory conditions.
Division of Endocrinology, Beth Israel
Hospital, Boston, Massachusetts 02215
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