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Related Concept Videos

Interactions Between Signaling Pathways01:19

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Related Experiment Video

Updated: May 22, 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

Selected melanocortin 1 receptor single-nucleotide polymorphisms differentially alter multiple signaling pathways.

J R Doyle1, J P Fortin, M Beinborn

  • 1Molecular Pharmacology Research Center, Molecular Cardiology Research Institute, Tufts Medical Center, Boston, Massachusetts, USA.

The Journal of Pharmacology and Experimental Therapeutics
|May 2, 2012
PubMed
Summary

Investigating melanocortin 1 receptor (MC1R) single-nucleotide polymorphisms (SNPs) reveals altered signaling. Certain MC1R variants, like F196L, show reduced function, but small molecules may restore activity.

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Last Updated: May 22, 2026

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Area of Science:

  • Pharmacology and Molecular Biology
  • G protein-coupled receptor (GPCR) research
  • Genetics and cellular signaling

Background:

  • The melanocortin 1 receptor (MC1R) is a crucial G protein-coupled receptor involved in pigmentation and inflammation.
  • MC1R exhibits significant genetic polymorphism, with single-nucleotide polymorphisms (SNPs) potentially altering its function.
  • Understanding the functional impact of MC1R SNPs is vital for comprehending variations in pigmentation and inflammatory responses.

Purpose of the Study:

  • To investigate the pharmacological effects of specific MC1R single-nucleotide polymorphisms (SNPs): V60L, R163Q, and F196L.
  • To assess how these MC1R variants influence basal and ligand-induced cAMP and mitogen-activated protein kinase (MAPK) signaling.
  • To explore the potential of small-molecule agonists to rescue the function of impaired MC1R variants.

Main Methods:

  • Transient expression of MC1R variants (V60L, R163Q, F196L) in human embryonic kidney 293 cells.
  • Assessment of cAMP signaling using luciferase reporter gene assays.
  • Evaluation of MAPK activation via Western blot analysis and phospho-extracellular signal-regulated kinase (pERK) detection.
  • In vitro inflammation model using A549 cells to assess inflammatory responses.

Main Results:

  • All MC1R variants exhibited reduced basal cAMP activity, with V60L and F196L showing decreased surface expression.
  • The F196L variant displayed significantly reduced potency for both the peptide agonist α-melanocyte-stimulating hormone (α-MSH) and the small-molecule agonist BMS-470539.
  • F196L showed diminished MAPK activation by both α-MSH and BMS-470539, while R163Q selectively lost α-MSH-induced MAPK activation but retained responsiveness to BMS-470539.
  • F196L expression enhanced inflammatory responses in A549 cells, an effect reversed by BMS-470539 treatment.

Conclusions:

  • Distinct MC1R SNPs are associated with novel and varied signaling profiles.
  • The F196L SNP significantly impairs MC1R signaling and enhances inflammatory responses.
  • Small-molecule agonists, such as BMS-470539, hold therapeutic potential for restoring the function of MC1R variants with diminished activity.