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Reductions in total body fat decrease humoral immunity.

Gregory E Demas1, Deborah L Drazen, Randy J Nelson

  • 1Department of Biology, Program in Neural Science, and Center for the Integrative Study of Animal Behavior, Indiana University, Bloomington, IN 47405, USA. gdemas@bio.indiana.edu

Proceedings. Biological Sciences
|June 14, 2003
PubMed
Summary
This summary is machine-generated.

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Moderate reductions in energy availability, achieved through partial lipectomy (fat removal), impair humoral immunity. This immune suppression was observed in prairie voles and Siberian hamsters, impacting antibody production.

Area of Science:

  • Immunology
  • Endocrinology
  • Metabolic research

Background:

  • Immune responses are energetically costly, and severe energy deficits suppress immunity.
  • The impact of moderate energy reductions on humoral immunity is less understood.

Purpose of the Study:

  • To investigate if moderate reductions in energy availability impair humoral immunity.
  • To examine the effects of partial lipectomy (fat tissue removal) on antibody production in prairie voles and Siberian hamsters.

Main Methods:

  • Surgical removal of epididymal white adipose tissue (EWATx) or inguinal white adipose tissue (IWATx) in rodents.
  • Injection with keyhole limpet haemocyanin (KLH) antigen at 4 and 12 weeks post-surgery.
  • Measurement of serum anti-KLH immunoglobulin G (IgG) levels.

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Main Results:

  • Prairie voles showed reduced IgG 12 weeks after IWATx, but not EWATx.
  • Siberian hamsters exhibited reduced IgG 4 weeks after both IWATx and EWATx.
  • EWATx hamsters showed compensatory fat gain and restored IgG levels by 12 weeks, while IWATx hamsters had sustained IgG reduction.

Conclusions:

  • Moderate reductions in energy availability, specifically through fat tissue removal, can impair humoral immune function.
  • The type and duration of fat reduction influence the severity and recovery of immune impairment.
  • Adipose tissue plays a crucial role in supporting humoral immunity.