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Related Concept Videos

Mutations01:35

Mutations

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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.
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Skin Cancer01:30

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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.
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Pigmentation01:19

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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.
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Cancer Prevention02:59

Cancer Prevention

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Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
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Role of Skin in Vitamin D Synthesis01:23

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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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Studying Chronic Exposure of Mice to Ultraviolet B Radiation
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Does sunlight protect us from cancer?

Jacqueline E Marshall1, Scott N Byrne1

  • 1Cellular Photoimmunology Group, Discipline of Infectious Diseases and Immunology, Sydney Medical School at the Charles Perkins Centre, University of Sydney, Australia. scott.byrne@sydney.edu.au.

Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology
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PubMed
Summary
This summary is machine-generated.

Sunlight

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Area of Science:

  • Dermatology and Oncology
  • Photobiology
  • Cancer Research

Background:

  • Solar ultraviolet (UV) radiation is a primary risk factor for skin cancer due to its mutagenic and immunosuppressive effects.
  • Emerging evidence suggests sunlight exposure may offer protection against certain internal cancers.
  • Vitamin D deficiency is common in patients with these internal malignancies, prompting research into vitamin D supplementation for cancer treatment.

Purpose of the Study:

  • To investigate the potential cancer-protective properties of sunlight beyond vitamin D.
  • To explore alternative mechanisms by which sunlight might influence cancer development or progression.
  • To reconcile the observed protective effects of sunlight with disappointing vitamin D supplementation trial results.

Main Methods:

  • Review of existing epidemiological and clinical studies on sunlight exposure and cancer risk.
  • Analysis of the biological effects of solar UV radiation on cellular and immune functions.
  • Evaluation of data from completed vitamin D supplementation trials in cancer patients.

Main Results:

  • Solar UV radiation is a significant risk factor for skin tumors.
  • Sunlight exposure shows a potential protective association with some internal malignancies.
  • Vitamin D supplementation trials have yielded disappointing results in treating these cancers, suggesting other factors are involved.

Conclusions:

  • The protective effects of sunlight against internal cancers may not solely be mediated by vitamin D.
  • Further research is needed to elucidate the non-vitamin D-related mechanisms of sunlight's potential cancer-protective properties.
  • Understanding these mechanisms could lead to novel cancer prevention and treatment strategies.