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  1. Home
  3. Melanoma-associated Melanocortin 1 Receptor Variants Confer Redox Signaling-dependent Protection Against Oxidative Dna Damage.
  1. Home
  3. Melanoma-associated Melanocortin 1 Receptor Variants Confer Redox Signaling-dependent Protection Against Oxidative Dna Damage.

Related Experiment Video

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Melanoma-associated melanocortin 1 receptor variants confer redox signaling-dependent protection against oxidative

María Castejón-Griñán1, Sonia Cerdido1, José Sánchez-Beltrán1

  • 1Department of Biochemistry, Molecular Biology and Immunology, School of Medicine, University of Murcia and Biomedical Research Institute of Murcia (Instituto Murciano de Investigación Biosanitaria, IMIB), El Palmar, Murcia, Spain.

Redox Biology
|April 2, 2024

View abstract on PubMed

Summary
This summary is machine-generated.

Melanocortin 1 receptor variants (varMC1R) accelerate DNA repair, protecting against oxidative damage and potentially preventing melanoma in fair-skinned individuals. This study reveals varMC1R enhances base excision repair (BER) enzyme activity.

Keywords:
Base excision repair (BER)Melanocortin 1 receptor (MC1R)MelanomaOxidative DNA damageReactive oxygen species (ROS)

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Area of Science:

  • Genetics and Molecular Biology
  • Dermatology
  • Cancer Research

Background:

  • Cutaneous melanoma risk is linked to solar ultraviolet radiation (UVR) and pheomelanin, which exacerbates oxidative stress.
  • The melanocortin 1 receptor gene (MC1R) is a key melanoma susceptibility gene, with variants (varMC1R) associated with fair skin and increased melanoma risk.
  • varMC1R is hypothesized to increase risk via photosensitizing pheomelanins and deficient DNA damage repair, though MC1R's role in oxidative DNA damage repair is not fully understood.

Purpose of the Study:

  • To investigate the role of MC1R variants in the repair of oxidative DNA damage.
  • To elucidate the mechanisms by which varMC1R influences DNA repair pathways, specifically base excision repair (BER).
  • To understand the functional impact of varMC1R on melanocyte response to oxidative stress.

Main Methods:

  • Analysis of BER enzyme induction (OGG and APE-1/Ref1) in human melanoma cells with different MC1R genotypes (wtMC1R and varMC1R).
  • Investigation of the role of reactive oxygen species (ROS) and NADPH oxidase (NOX) in MC1R-mediated DNA repair.
  • Assessment of AKT pathway activation in response to ROS and its downstream effects on DNA repair.

Main Results:

  • varMC1R accelerates the clearance of reactive oxygen species (ROS)-induced DNA strand breaks via an AKT-dependent pathway.
  • varMC1R protects against ROS-dependent formation of 8-oxodG, a major oxidative DNA lesion.
  • Agonist activation of both wtMC1R and varMC1R induced key BER enzymes (OGG, APE-1/Ref1), with NOX-dependent ROS generation mediating AKT activation and DNA repair downstream of varMC1R.

Conclusions:

  • MC1R variants enhance the base excision repair (BER) pathway, contributing to protection against oxidative DNA damage.
  • The findings highlight a novel mechanism of photoprotection involving MC1R and ROS-mediated DNA repair.
  • Understanding varMC1R function offers potential for developing strategies to prevent melanoma in susceptible populations.