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Related Concept Videos

Skin Cancer01:30

Skin Cancer

Skin cancer is a type of cancer that occurs when there is an abnormal growth of skin cells, usually triggered by damage to the DNA within the skin cells. It is primarily caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. Skin cancer is the most common type of cancer worldwide, and its incidence continues to rise.
Basal Cell Carcinoma (BCC): BCC is the most common type of skin cancer, accounting for about 80% of cases. It typically develops in...
Pigmentation01:19

Pigmentation

The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...
Role of Skin in Vitamin D Synthesis01:23

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).
Changes in Skin Color: Clinical Perspectives01:14

Changes in Skin Color: Clinical Perspectives

The first thing a clinician sees is the skin, so the examination of the skin should be part of any thorough physical examination. Most skin disorders are relatively benign, but a few, including melanomas, can be fatal if untreated. A couple of the more noticeable disorders, albinism and vitiligo, affect the appearance of the skin and its accessory organs.
Albinism
Albinism is a genetic disorder that affects (completely or partially) the coloring of skin, hair, and eyes. The defect is primarily...
Role of Vitamins in Maintaining Bone Health01:25

Role of Vitamins in Maintaining Bone Health

The growth and maintenance of bone are regulated by a combination of nutritional factors, including vitamins, such as vitamin A, B12, C, D, and K.
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.
Vitamin B12
Vitamin B12 acts as a cofactor during the formation of osteoblast-related proteins, such as osteocalcin. Vitamin B12 plays a role...
Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...

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Related Experiment Video

Updated: Jun 3, 2026

Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model
12:37

Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model

Published on: September 7, 2013

Melanoma and vitamin D.

Sinead Field1, Julia A Newton-Bishop

  • 1Section of Epidemiology and Biostatistics, Leeds Institute of Molecular Medicine, University of Leeds, Leeds LS97TF, UK.

Molecular Oncology
|March 5, 2011
PubMed
Summary

Vitamin D, essential for health, shows anti-cancer effects on melanoma cells. Maintaining optimal vitamin D levels may benefit melanoma patients, though immune system impacts require further study.

Area of Science:

  • Endocrinology
  • Dermatology
  • Oncology

Background:

  • Vitamin D is a crucial steroid hormone synthesized primarily through sun exposure.
  • Sub-optimal vitamin D levels (<70 nmol/L) are prevalent globally.
  • Epidemiological studies link low vitamin D to increased cancer risk, including breast and gastrointestinal cancers.

Purpose of the Study:

  • To review current data on the role of vitamin D in melanoma.
  • To explore vitamin D's effects on melanoma cell proliferation and patient outcomes.
  • To discuss the complex relationship between sun exposure, vitamin D, and melanoma susceptibility.

Main Methods:

  • Review of in vitro studies on vitamin D's effects on melanoma cells.
  • Analysis of epidemiological data correlating vitamin D levels with melanoma patient outcomes.

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Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
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A 3D Organotypic Melanoma Spheroid Skin Model
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A 3D Organotypic Melanoma Spheroid Skin Model

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Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model
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Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
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Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells

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  • Discussion of research on vitamin D's influence on immune responses and sun exposure patterns.
  • Main Results:

    • In vitro studies indicate vitamin D exhibits anti-proliferative and pro-apoptotic effects on melanoma cells.
    • Patient data suggests vitamin D levels at diagnosis may influence melanoma patient outcomes.
    • The relationship between sun exposure, vitamin D production, and melanoma risk is complex and not fully understood.

    Conclusions:

    • Vitamin D demonstrates anti-proliferative effects on melanoma cells, suggesting potential therapeutic benefits.
    • Maintaining serum vitamin D levels between 70-100 nmol/L may be a reasonable target for melanoma patients.
    • Further research is needed to clarify vitamin D's impact on the immune system and its precise role in melanoma susceptibility and progression.