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G-protein-coupled receptor kinase 2 safeguards epithelial phenotype in head and neck squamous cell carcinomas

Julia Palacios-García1,2, María Sanz-Flores1,2, Alejandro Asensio1,2

  • 1Departamento de Biología Molecular and Centro de Biología Molecular "Severo Ochoa" (UAM-CSIC), Madrid, Spain.

International Journal of Cancer
|December 19, 2019
PubMed

Insights

Reduced G-protein-coupled receptor kinase-2 (GRK2) expression in head and neck squamous cell carcinoma (HNSCC) promotes tumor cell invasion and metastasis. Restoring GRK2 levels can suppress these aggressive traits by inhibiting key cancer-promoting pathways.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Head and neck squamous cell carcinoma (HNSCC) presents limited treatment options for advanced stages.
  • Understanding molecular drivers of HNSCC recurrence and metastasis is crucial for developing new therapies.

Purpose of the Study:

  • To investigate the role of G-protein-coupled receptor kinase-2 (GRK2) in HNSCC progression.
  • To determine if GRK2 downregulation contributes to epithelial-to-mesenchymal transition (EMT) and metastasis in HNSCC.

Main Methods:

  • Analysis of GRK2 expression in human HNSCC tumors.
  • Silencing and overexpression of GRK2 in HNSCC cell lines.
  • Assessment of EMT markers and transcriptional programs.
  • Evaluation of lymph node colonization in mouse models.
  • Investigation of GRK2's effect on Snail1 phosphorylation and activity.

Main Results:

  • GRK2 expression is decreased in undifferentiated, high-grade HNSCC.
  • GRK2 silencing in HNSCC cells induces EMT features and enhances lymph node metastasis in vivo.
  • Increased GRK2 expression reverses mesenchymal traits and reduces Snail1 functionality.
  • GRK2 phosphorylation and inactivation of Snail1 are key mechanisms.

Conclusions:

  • GRK2 acts as a tumor suppressor by maintaining the epithelial phenotype in HNSCC.
  • Downregulation of GRK2 facilitates EMT activation and promotes HNSCC metastasis.
  • Targeting GRK2 may offer a therapeutic strategy for advanced HNSCC.
Keywords:
G-protein-coupled receptor kinase 2Snail1epithelial-to-mesenchymal transitionhead and neck squamous cell carcinomassquamous cell carcinomas

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