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Human cutaneous melanomas lacking MITF and melanocyte differentiation antigens express a functional Axl receptor

Marialuisa Sensi1, Mara Catani, Giancarlo Castellano

  • 1Unit of Immunobiology of Human Tumors, Department of Experimental Oncology and Molecular Medicine, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy. marialuisa.sensi@istitutotumori.mi.it

The Journal of Investigative Dermatology
|July 29, 2011
PubMed

Insights

Axl receptor tyrosine kinase is overexpressed in some melanomas, promoting invasion and motility. Inhibiting Axl may offer a new therapeutic strategy for these specific cancer types.

Area of Science:

  • Oncology
  • Molecular Biology
  • Dermatology

Background:

  • The TAM receptor tyrosine kinase family, including Axl, plays a role in cancer development.
  • Axl signaling is implicated in various cellular processes relevant to tumor progression.

Purpose of the Study:

  • To investigate the role of Axl in cutaneous melanoma.
  • To explore the therapeutic potential of targeting Axl in melanoma.

Main Methods:

  • Analysis of 58 cutaneous melanoma cell lines for Axl expression.
  • Gene expression correlation analysis and functional grouping.
  • In vitro assays for motility, invasion, and wound healing.
  • Axl knockdown and pharmacological inhibition using R428.

Main Results:

  • Axl was expressed in 38% of melanoma lines, particularly in NRAS-mutated tumors.
  • Axl expression inversely correlated with melanocyte differentiation markers (MITF, MDAs) and positively correlated with genes involved in motility and invasion.
  • Axl-positive melanomas showed increased in vitro invasiveness and motility.
  • Axl inhibition (knockdown or R428) reduced melanoma cell migration and invasion.

Conclusions:

  • Axl signaling promotes melanoma cell motility and invasion.
  • Targeting Axl may be a viable therapeutic strategy for melanomas lacking MITF and MDAs.

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