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Milk Exosome-Derived MicroRNA-2478 Suppresses Melanogenesis through the Akt-GSK3β Pathway

In-Seon Bae1, Sang Hoon Kim1

  • 1Department of Biology, Kyung Hee University, Seoul 02447, Korea.

Cells
|November 27, 2021
PubMed

Insights

Milk exosomes, containing microRNAs, can regulate skin pigmentation. Bovine miR-2478 inhibits melanin production by targeting Rap1a, suggesting milk exosomes as potential whitening cosmeceuticals.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Exosomes mediate intercellular communication via molecule transfer.
  • Milk exosomes are rich in microRNAs (miRNAs), small noncoding RNAs crucial for biological processes.
  • The precise functions of milk exosomes, particularly in melanogenesis, remain largely unexplored.

Purpose of the Study:

  • To investigate the impact of milk exosomes on melanin production in melanoma cells and melanocytes.
  • To elucidate the molecular mechanisms underlying the effects of milk exosomes on melanogenesis.

Main Methods:

  • Treatment of melanoma cells and melanocytes with milk exosomes.
  • Assays for melanin content, tyrosinase activity, and melanogenesis-related gene expression.
  • Analysis of miRNA and gene expression, including miR-2478 and Rap1a.
  • Investigation of signaling pathways, specifically Akt-GSK3β.

Main Results:

  • Milk exosomes significantly reduced melanin content, tyrosinase activity, and melanogenesis-related gene expression.
  • Bovine-specific miR-2478 within exosomes was identified as an inhibitor of melanin production.
  • MiR-2478 directly targeted Rap1a, leading to its downregulation.
  • Rap1a inhibition suppressed melanogenesis via the Akt-GSK3β signaling pathway.

Conclusions:

  • MiR-2478 from milk exosomes regulates melanogenesis by directly targeting Rap1a.
  • This mechanism highlights the potential of milk exosomes as cosmeceutical ingredients for skin whitening applications.
Keywords:
Rap1amelanogenesismiR-2478milk exosome

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