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Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
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Experimental Metastasis Assay
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Melanoma Cell Galectin-1 Ligands Functionally Correlate with Malignant Potential.

Erika M Yazawa1, Jenna E Geddes-Sweeney1, Filiberto Cedeno-Laurent1

  • 1Department of Dermatology, Brigham and Women's Hospital, Boston, Massachusetts, USA.

The Journal of Investigative Dermatology
|March 11, 2015
PubMed
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This summary is machine-generated.

Melanoma cell adhesion molecule (MCAM) acts as a key Galectin-1 (Gal-1) ligand, driving melanoma growth and migration. Inhibiting this interaction may offer new therapeutic strategies for melanoma.

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Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology
  • Biochemistry

Background:

  • Galectin-1 (Gal-1) binding to ligands on immune and endothelial cells impacts melanoma by suppressing antitumor immunity and promoting angiogenesis.
  • The functional expression of Gal-1 ligands on melanoma cells and their role in intrinsic malignant features are not well understood.

Purpose of the Study:

  • To analyze the expression, identity, and function of Gal-1 ligands during melanoma progression.
  • To investigate the role of melanoma cell-expressed Gal-1 ligands in controlling melanoma malignancy.

Main Methods:

  • Immunofluorescent analysis of human melanocytic neoplasms to detect Gal-1 ligand abundance.
  • Biochemical assessments to identify major Gal-1 ligands and their glycan dependencies (N-glycans, O-glycans).
  • Functional studies in Gal-1-deficient mice using MCAM-silenced (MCAM(KD)) or ST6GalNAc2-overexpressing (ST6(O/E)) melanoma cells to evaluate growth and migration.

Main Results:

  • Gal-1 ligands are abundant in dysplastic nevi, primary, and metastatic melanomas.
  • Melanoma cell adhesion molecule (MCAM) is a major Gal-1 ligand, dependent on N-glycans; O-glycan activity is regulated by ST6GalNAc2.
  • MCAM(KD) or ST6(O/E) melanoma cells showed reduced growth and significantly inhibited migration in Gal-1-deficient mice.

Conclusions:

  • Melanoma cell-expressed Gal-1 ligands, particularly MCAM, play a crucial role in melanoma growth and migration.
  • Host Galectin-1 and melanoma cell Gal-1 ligand interactions contribute significantly to melanoma malignancy.
  • Targeting Gal-1/melanoma cell Gal-1 ligand interactions presents a potential therapeutic strategy for melanoma.