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Factors Affecting the Risk of Infection01:26

Factors Affecting the Risk of Infection

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The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
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The skin plays a crucial role in the synthesis of vitamin D, a vital nutrient for various physiological processes in the body. Vitamin D is unique because it can be synthesized in the skin through a series of chemical reactions triggered by exposure to ultraviolet B (UVB) radiation from sunlight.
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Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
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Vitamin D, infections and immunity.

Aiten Ismailova1, John H White2,3

  • 1Departments of Physiology, McGill University, Montreal, Qc, Canada.

Reviews in Endocrine & Metabolic Disorders
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Vitamin D regulates innate immunity and antimicrobial peptide production. Supplementation may offer therapeutic benefits for infectious diseases, including COVID-19.

Keywords:
AntibacterialAntiviralCOVID-19CathelicidinInflammationNOD2Vitamin Dβ-defensin 2

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Area of Science:

  • Immunology
  • Endocrinology
  • Microbiology

Background:

  • Vitamin D is crucial for skeletal health and innate immune responses.
  • Immune cells produce 1,25-dihydroxyvitamin D (1,25D) locally at infection sites.
  • Vitamin D signaling influences pattern recognition receptors and autophagy.

Purpose of the Study:

  • To review current knowledge on vitamin D signaling in innate immunity.
  • To assess the therapeutic potential of vitamin D supplementation in infectious diseases.
  • To analyze vitamin D's benefits for COVID-19.

Main Methods:

  • Literature review of laboratory and epidemiological studies.
  • Analysis of vitamin D's mechanisms of action in immune cells.
  • Assessment of clinical evidence for vitamin D supplementation.

Main Results:

  • Vitamin D induces antimicrobial peptide production and stimulates autophagy.
  • Vitamin D deficiency is linked to increased susceptibility to infections like dental caries, IBD, and viral infections.
  • Vitamin D plays a role in both antibacterial and antiviral innate immunity.

Conclusions:

  • Vitamin D signaling is a critical component of the innate immune system.
  • Vitamin D supplementation shows therapeutic potential for various infectious diseases.
  • Further research into vitamin D's role in managing COVID-19 is warranted.