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Role of Skin in Vitamin D Synthesis

Role of Skin in Vitamin D Synthesis

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.
The solar UV B rays (290-315 nm) are absorbed by the skin, and 7-dehydrocholesterol (provitamin D3) photolyzes it to previtamin D3, which undergoes a rapid transformation to vitamin D3(cholecalciferol).

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Vitamin A
Vitamin A is involved in the process of bone remodeling. Retinoic acid, the active metabolite of Vitamin A, has nuclear receptors in osteoblasts and osteoclasts, which are involved in bone remodeling.
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Vitamin B12 acts as a cofactor during the formation of osteoblast-related proteins, such as osteocalcin. Vitamin B12 plays a role...

Skeleton and Calcium Homeostasis

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Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.

The Functions of the Skeletal System

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The most apparent functions of the skeletal system are support, protection, and movement. However, bone tissue also performs several other critical metabolic functions. For one, the bone matrix acts as a reservoir for a number of minerals important to the functioning of the body, especially calcium and phosphorus. These minerals, present in the bone tissue, can be released back into the bloodstream when required. Calcium ions, for example, are essential for muscle contractions and controlling...

What is the Skeletal System?

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Connective tissue develops from the mesoderm of a developing embryo and consists of cells, fibers, and ground substance: a gel-like material containing large complexes of carbohydrates and proteins. Connective tissue was first identified as a separate tissue family in the 18th century, and Johannes Peter Muller coined the term connective tissue.
Fat cells (adipocytes), smooth muscle cells (myoblasts), and bone cells (osteoblasts) are some connective tissue cell types. Some immune system cells...

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Related Experiment Video

Updated: Jul 2, 2026

Isolation of Mesenchymal Stem Cells from Human Alveolar Periosteum and Effects of Vitamin D on Osteogenic Activity of Periosteum-derived Cells

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Vitamin D and skeletal muscle tissue and function.

¹Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Bone Metabolism Laboratory, 711 Washington Street, Boston, MA 02111, USA. lisa.ceglia@tufts.edu

Molecular Aspects of Medicine

|August 30, 2008

Summary

Vitamin D is crucial for skeletal muscle health, improving strength and performance. Supplementation can enhance muscle function and reduce falls, especially in older adults with deficiency.

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$X-ray Diffraction of Intact Murine Skeletal Muscle as a Tool for Studying the Structural Basis of Muscle Disease$

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Published on: July 18, 2019

Area of Science:

Muscle physiology
Endocrinology
Nutritional science

Background:

Vitamin D deficiency is linked to muscle weakness (myopathy).
Existing research suggests a positive correlation between vitamin D levels, muscle strength, and physical performance.
Vitamin D supplementation may mitigate fall risk in older adults.

Purpose of the Study:

To review the current understanding of vitamin D's role in skeletal muscle.
To explore the molecular mechanisms underlying vitamin D's effects on muscle.
To identify areas for future research in vitamin D and muscle function.

Main Methods:

Literature review of clinical studies and molecular research.
Analysis of data from vitamin D deficient populations.
Examination of knockout mouse models for vitamin D receptor (VDR) function.
Consideration of VDR polymorphisms and parathyroid hormone interactions.

Main Results:

Vitamin D status positively correlates with muscle strength and physical performance.
Supplementation improves muscle function tests and reduces falls in deficient older adults.
Both genomic and non-genomic pathways mediate vitamin D's action in muscle cells.

Conclusions:

Vitamin D plays a significant role in skeletal muscle function.
Further research is needed to fully elucidate the mechanisms of vitamin D action on muscle and its clinical translation.
Understanding VDR and potential interactions with parathyroid hormone is key.