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Related Experiment Videos

Tumor necrosis factor-alpha and anorexia--cause or effect?

N Vaisman1, T Hahn

  • 1Clinical Nutrition Clinic, Kaplan Hospital, Rehovot, Israel.

Metabolism: Clinical and Experimental
|July 1, 1991
PubMed
Summary

Tumor necrosis factor-alpha (TNF-alpha) is elevated in anorexia nervosa (AN) patients, but not in other chronic undernutrition cases. Refeeding patients with AN normalized TNF-alpha levels, suggesting a link to weight restoration.

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Area of Science:

  • Immunology
  • Metabolic Disorders
  • Nutritional Science

Background:

  • Tumor necrosis factor-alpha (TNF-alpha), a key cytokine, is implicated in weight loss associated with malignancies and chronic infections.
  • Increased spontaneous TNF-alpha production is observed in patients with anorexia nervosa (AN).
  • The role of TNF-alpha in other forms of chronic undernutrition and during refeeding in AN requires further investigation.

Purpose of the Study:

  • To investigate in vitro TNF-alpha production in chronic undernutrition beyond AN.
  • To examine changes in TNF-alpha production during the refeeding process in AN patients.

Main Methods:

  • Assessed undernutrition using fat body mass (FBM) and lean body mass (LBM) measurements.
  • Measured spontaneous and induced TNF-alpha production from peripheral blood mononuclear cells (PBMC).

Related Experiment Videos

  • Compared TNF-alpha levels in chronically undernourished patients, AN patients, and healthy controls.

    • Main Results:

    • Spontaneous TNF-alpha production was normal in chronically undernourished subjects.
    • Significantly elevated spontaneous TNF-alpha production was observed in AN patients compared to controls.
    • TNF-alpha production decreased to normal levels in AN patients during refeeding, correlating with weight gain.

    Conclusions:

    • Chronic undernutrition is not universally linked to increased TNF-alpha production.
    • Elevated TNF-alpha in AN may be associated with the undernourished state and normalize with nutritional rehabilitation.
    • The precise role of TNF-alpha in the pathogenesis of AN remains to be elucidated.