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Photoprotection by 1,25 dihydroxyvitamin D3 is associated with an increase in p53 and a decrease in nitric oxide

Ritu Gupta1, Katie M Dixon, Shivashni S Deo

  • 1Department of Physiology and The Bosch Institute, University of Sydney, Sydney, New South Wales, Australia.

The Journal of Investigative Dermatology
|December 16, 2006
PubMed
Summary

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The active vitamin D hormone, 1,25 dihydroxyvitamin D3, enhances skin cell survival and reduces DNA damage after UVR. This suggests vitamin D plays a role in the skin

Area of Science:

  • Dermatology
  • Biochemistry
  • Molecular Biology

Background:

  • Ultraviolet B (UVB) radiation triggers vitamin D synthesis in the skin.
  • The active form of vitamin D, 1,25 dihydroxyvitamin D3 (1,25(OH)2D3), is investigated for its protective effects against UV damage.

Purpose of the Study:

  • To test if 1,25(OH)2D3 increases skin cell survival post-UV irradiation.
  • To determine if 1,25(OH)2D3 reduces DNA damage in surviving cells.

Main Methods:

  • Keratinocyte cultures and Skh:hr1 mouse skin sections were used.
  • Cells and skin were exposed to UVR, with some treated with 1,25(OH)2D3.
  • DNA damage (thymine dimers), cell survival, p53 protein expression, nitric oxide (NO) products, and sunburn cells were assessed.

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Main Results:

  • 1,25(OH)2D3 significantly increased keratinocyte survival after UVR.
  • Significant reductions in thymine dimers and sunburn cells were observed in 1,25(OH)2D3-treated samples.
  • Increased nuclear p53 protein and reduced NO products correlated with reduced DNA damage.

Conclusions:

  • The vitamin D system in the skin may act as an intrinsic protective mechanism against UV-induced damage.
  • 1,25(OH)2D3 demonstrates a protective role by enhancing cell survival and reducing DNA damage, potentially mediated by p53 and NO pathways.