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Vitamin D and immune function: an overview.

Martin Hewison1

  • 1UCLA and Orthopaedic Hospital Department of Orthopaedic Surgery and the Orthopaedic Hospital Research Center, David Geffen School of Medicine at UCLA, 615 Charles E. Young, Los Angeles, CA 90095, USA. mhewison@mednet.ucla.edu

The Proceedings of the Nutrition Society
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PubMed
Summary
This summary is machine-generated.

Vitamin D plays a crucial role in both innate and adaptive immunity. Vitamin D insufficiency is linked to immune disorders like autoimmune diseases and infections, highlighting its importance for normal immune function.

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Area of Science:

  • Immunology
  • Endocrinology
  • Nutritional Science

Background:

  • Vitamin D's immunomodulatory effects have been known for decades.
  • Recent evidence links vitamin D insufficiency to various immune disorders.
  • Global awareness of low 25-hydroxyvitamin D levels has spurred research into associated health problems.

Purpose of the Study:

  • To explore the significance of vitamin D in normal human physiology.
  • To investigate the link between vitamin D insufficiency and immune disorders.
  • To elucidate the mechanisms by which vitamin D influences the immune system.

Main Methods:

  • Epidemiological investigations of populations with vitamin D insufficiency.
  • Analysis of molecular mechanisms involving vitamin D metabolism in immune cells.
  • Examination of vitamin D's role in regulating T-lymphocyte and dendritic cell function.

Main Results:

  • Vitamin D insufficiency is associated with autoimmune diseases (e.g., multiple sclerosis, type 1 diabetes, Crohn's disease) and infections (e.g., tuberculosis).
  • Immune cells possess the machinery to convert 25-hydroxyvitamin D to its active form, 1,25-dihydroxyvitamin D.
  • Vitamin D regulates antimicrobial responses in macrophages and the maturation of antigen-presenting dendritic cells, influencing T-cell function and regulatory T-cell development.

Conclusions:

  • Vitamin D is a critical factor connecting innate and adaptive immunity.
  • Both arms of the immune system may be compromised by vitamin D insufficiency.
  • Maintaining adequate vitamin D levels is essential for optimal immune function.