Vitamin D and the immune system: beyond rickets

Area of Science:

• Endocrinology
• Immunology
• Cell Biology

Background:

• Vitamin D is crucial for calcium homeostasis and bone metabolism.
• Beyond its skeletal role, vitamin D influences cell differentiation, growth, and hormonal systems.
• The active form, 1,25-dihydroxyvitamin D (calcitriol), interacts with the vitamin D receptor to mediate diverse biological effects.

Purpose of the Study:

• To review the immunomodulatory effects of vitamin D, focusing on human immune function.
• To highlight the link between low vitamin D status and various diseases, including neoplasia, autoimmune disorders, cardiovascular conditions, and infections.
• To encourage further investigation into vitamin D's role in veterinary immunology.

Main Methods:

• This review synthesizes existing literature on vitamin D's biological actions and immune system interactions.
• Focus is placed on studies examining vitamin D's effects in human immunology.
• The review also considers the implications of vitamin D status for various health conditions.

Main Results:

• Vitamin D plays a significant immunoregulatory role in both innate and adaptive immunity.
• Low vitamin D status is associated with an increased risk of developing neoplasia, autoimmune diseases, cardiovascular disorders, and infectious diseases.
• The active metabolite, calcitriol, exerts pleiotropic effects via the vitamin D receptor.

Conclusions:

• Vitamin D has broad biological functions, including critical roles in immune modulation.
• Maintaining adequate vitamin D levels may be important for preventing or managing a range of diseases.
• Further research into vitamin D's effects on immune function is warranted, particularly for applications in veterinary medicine.