MC1R stimulation by alpha-MSH induces catalase and promotes its re-distribution to the cell periphery and dendrites

Pigment Cell Melanoma Res. 2010 Apr;23(2):263-75. doi: 10.1111/j.1755-148X.2010.00673.x. Epub 2010 Jan 12.

Abstract

We demonstrated a direct correlation between melanogenic and catalase activities on in vitro and ex vivo models. Here, we investigated whether the stimulation of Melanocortin-1 Receptor (MC1R) could influence catalase expression, activity and cellular localization. For this purpose, we treated B16-F0 melanoma cells with alpha-Melanocyte Stimulating Hormone (alpha-MSH) and we showed a rapid induction of catalase through a cAMP/PKA-dependent, microphthalmia-associated transcription factor (MITF) independent mechanism, acting at post-transcriptional level. Moreover, alpha-MSH promoted a partial re-distribution of catalase to the cell periphery and dendrites. This work strengthens the correlation between melanogenesis and anti-oxidants, demonstrating the induction of catalase in response to a melanogenic stimulation, such as alpha-MSH-dependent MC1R activation. Moreover, this study highlights catalase regulatory mechanisms poorly known, and attributes to alpha-MSH a protective role in defending melanocytes, and possibly keratinocytes, not only on the basis of its pigmentary action, but also for its capacity to stimulate a quick anti-oxidant defence.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Catalase / biosynthesis
  • Catalase / metabolism*
  • Cell Membrane / drug effects*
  • Cell Membrane / enzymology
  • Cyclic AMP / metabolism
  • Cyclic AMP-Dependent Protein Kinase Type II / metabolism
  • Dendrites / drug effects*
  • Dendrites / enzymology
  • Melanoma / metabolism*
  • Melanoma / pathology
  • Mice
  • Protein Transport / drug effects
  • Receptor, Melanocortin, Type 1 / agonists
  • Receptor, Melanocortin, Type 1 / metabolism*
  • Structure-Activity Relationship
  • Tumor Cells, Cultured
  • alpha-MSH / pharmacology*

Substances

  • Receptor, Melanocortin, Type 1
  • alpha-MSH
  • Cyclic AMP
  • Catalase
  • Cyclic AMP-Dependent Protein Kinase Type II