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Vitamin D and evolution: Pharmacologic implications.

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Vitamin D3, initially an UV-B scavenger, evolved with the vitamin D receptor (VDR) to regulate immunity and bone health. Its importance is highlighted by evolutionary adaptations for synthesis in diverse human populations.

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Area of Science:

  • Endocrinology
  • Evolutionary Biology
  • Immunology

Background:

  • Vitamin D3 synthesis is a non-enzymatic process triggered by UV-B radiation acting on 7-dehydrocholesterol.
  • The vitamin D receptor (VDR) evolved approximately 550 million years ago, binding 1α,25-dihydroxyvitamin D3 and regulating metabolic and immune genes.

Purpose of the Study:

  • To explore the evolutionary origins and pleiotropic functions of vitamin D signaling.
  • To investigate the interplay between vitamin D, bone metabolism, and the immune system.
  • To understand the evolutionary drivers for vitamin D synthesis and its impact on human health.

Main Methods:

  • Review of evolutionary and endocrinological literature.
  • Analysis of VDR evolution and its relation to nuclear receptors.
  • Examination of osteoimmune interactions and vitamin D's regulatory role.

Main Results:

  • Vitamin D's ancestral role was UV-B radiation scavenging.
  • VDR evolved from receptors sensing cholesterol derivatives, influencing innate and adaptive immunity.
  • Bidirectional osteoimmune interactions are regulated by vitamin D, demonstrating its pleiotropic effects.

Conclusions:

  • Vitamin D signaling is pleiotropic, impacting immunity, bone metabolism, and cellular processes.
  • Evolutionary adaptations, like increased 7-dehydrocholesterol, underscore vitamin D's importance for human health, particularly in low-light environments.
  • Vitamin D derivatives offer potential pharmacological applications due to their diverse physiological roles.