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Expression and subcellular localization of RAGE in melanoma cells

Ioana Popa1, Elena Ganea, Stefana M Petrescu

  • 1Institute of Biochemistry of the Romanian Academy, Splaiul Independentei 296, Bucharest 060031, Romania.

Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire
|April 5, 2014
PubMed

Insights

The receptor for advanced glycation end products (RAGE) shows distinct localization and oligomerization in melanoma cells, impacting migration and progression. RAGE

Area of Science:

  • Oncology
  • Cell Biology
  • Biochemistry

Background:

  • The receptor for advanced glycation end products (RAGE) plays a role in tumor development and malignancy.
  • Understanding RAGE's function in tumor progression requires investigating its expression and localization in melanoma cells.

Purpose of the Study:

  • To investigate the expression profile and subcellular localization of RAGE in melanoma cells at different malignancy stages.
  • To determine the impact of RAGE localization and oligomerization on melanoma cell migration and progression.

Main Methods:

  • Immunofluorescence microscopy to visualize RAGE localization in melanoma cells.
  • RNA interference (RNAi) to silence RAGE expression and assess its effect on cell migration.
  • Western blot analysis and SDS-PAGE to study RAGE oligomerization and glycosylation.
  • Treatment with cholesterol-chelating drugs (nystatin, filipin) to investigate RAGE's association with cholesterol-rich membranes.

Main Results:

  • RAGE localized to membrane ruffles and leading edges in primary melanoma cells (MelJuSo), but was more dispersed in metastatic cells (SK-Mel28).
  • RAGE silencing inhibited MelJuSo cell migration but not SK-Mel28 cell migration.
  • MelJuSo cells exhibited more complex RAGE oligomerization compared to melanocytes and SK-Mel28 cells, involving disulfide bonds and other interactions.
  • Cholesterol-chelating drugs altered RAGE localization in MelJuSo cells; SK-Mel28 cells showed reduced RAGE glycosylation, cholesterol association, and soluble forms.

Conclusions:

  • RAGE isoform expression and subcellular localization are critical regulators of its function in melanoma progression.
  • Distinct RAGE localization and oligomerization patterns correlate with melanoma cell malignancy and migratory potential.
  • RAGE's interaction with cholesterol-rich membranes influences its function in melanoma cells.

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