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Cells of the Epidermis01:24

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Generation and Culturing of Primary Human Keratinocytes from Adult Skin
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Opsin expression in human epidermal skin.

Kirk Haltaufderhyde1, Rana N Ozdeslik, Nadine L Wicks

  • 1Department of Molecular Pharmacology, Physiology and Biotechnology, Brown University, Providence, RI.

Photochemistry and Photobiology
|October 1, 2014
PubMed
Summary
This summary is machine-generated.

Human skin cells express opsins, light-sensing proteins found in the eye. These opsins may play a role in how skin cells detect and respond to ultraviolet radiation (UVR).

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Area of Science:

  • Dermatology
  • Molecular Biology
  • Photobiology

Background:

  • Human skin faces constant exposure to solar radiation, including harmful ultraviolet radiation (UVR).
  • UVR can cause DNA damage, oxidative stress, and cellular responses mediated by signaling pathways.
  • The epidermis's broad light exposure suggests a potential role for light-sensing molecules beyond the eye.

Purpose of the Study:

  • To investigate the expression of opsins, known photoreceptors, in human epidermal cells.
  • To determine if opsins in the skin function as photosensors, potentially mediating responses to UVR.

Main Methods:

  • Analysis of opsin gene (OPN1-SW, OPN2, OPN3, OPN5) mRNA expression in human melanocytes and keratinocytes.
  • Assessment of opsin splice variants and protein-coding potential.
  • Evaluation of mRNA expression changes in response to physiological doses of UVR.

Main Results:

  • Four opsins (OPN1-SW, OPN2, OPN3, OPN5) are expressed in both melanocytes and keratinocytes.
  • OPN2 and OPN3 showed higher mRNA abundance and encoded full-length proteins.
  • UV radiation did not alter the mRNA expression profile of these opsins.
  • Multiple splice variants were identified for OPN3 and OPN5, with some OPN5 variants encoding truncated proteins.

Conclusions:

  • Opsins are present in major human epidermal cell types.
  • These opsins may function as photosensors in the skin.
  • Opsins could initiate light-induced signaling pathways, contributing to UVR phototransduction.