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D-hormone and the immune system.

Margherita T Cantorna1, Brett D Mahon

  • 1Department of Nutritional Sciences, Pennsylvania State University, University Park, Pennsylvania 16802, USA. mxc69@psu.edu

The Journal of Rheumatology. Supplement
|September 6, 2005
PubMed
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Vitamin D hormone [1,25(OH)2 D3] selectively regulates the immune system, inhibiting autoimmune diseases like IBD by downregulating TNF-alpha genes. Its effectiveness varies based on the specific immune response.

Area of Science:

  • Immunology
  • Endocrinology
  • Gastroenterology

Background:

  • 1,25(OH)2 D3 (Vitamin D hormone) is a key immune regulator.
  • It inhibits experimental autoimmune diseases like IBD, RA, MS, and type 1 diabetes.
  • However, it does not affect experimental asthma or immunity to infectious organisms.

Purpose of the Study:

  • To investigate the molecular mechanisms of Vitamin D hormone's therapeutic effects in experimental inflammatory bowel disease (IBD).
  • To analyze gene expression changes in the colon following Vitamin D hormone treatment in mice with IBD.

Main Methods:

  • Microarray analysis was performed on colon tissues from mice with experimental IBD treated with Vitamin D hormone.
  • Gene expression profiles were compared between treated and untreated groups.

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Main Results:

  • Vitamin D hormone treatment resulted in the inhibition of 239 genes and upregulation of 298 genes in the colon.
  • Notably, three genes related to tumor necrosis factor-alpha (TNF-alpha) were inhibited.
  • These findings suggest Vitamin D hormone's efficacy in autoimmune conditions may involve the downregulation of the TNF-alpha gene family.

Conclusions:

  • Vitamin D hormone acts as a selective immune system regulator.
  • Its therapeutic effects in autoimmune diseases are partly attributed to the inhibition of TNF-alpha related genes.
  • The outcome of Vitamin D hormone treatment is dependent on the nature of the immune response, such as autoimmune disease versus infectious disease.