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Src kinases catalytic activity regulates proliferation, migration and invasiveness of MDA-MB-231 breast cancer cells

María Pilar Sánchez-Bailón1, Annarica Calcabrini, Daniel Gómez-Domínguez

  • 1Dpto. Biología del Cáncer, Instituto de Investigaciones Biomédicas A. Sols (CSIC/UAM), Arturo Duperier 4, 28029 Madrid, Spain.

Cellular Signalling
|May 10, 2012
PubMed

Insights

Src family kinases (SFKs) are crucial in cancer progression. Inhibiting SFKs impacts breast cancer cell migration and proliferation, with one inhibitor, SU6656, also targeting Aurora B kinase.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Src family kinases (SFKs) are frequently deregulated in cancer, controlling key processes like proliferation, migration, survival, and metastasis.
  • Triple-negative/basal-like and metastatic human breast cancer cells (MDA-MB-231) are aggressive and rely on SFKs for their malignant phenotype.

Purpose of the Study:

  • To investigate the role of SFKs catalytic activity in MDA-MB-231 breast cancer cells.
  • To differentiate the mechanisms of action of three SFK inhibitors: Dasatinib, PP2, and SU6656.

Main Methods:

  • Treatment of MDA-MB-231 cells with SFK inhibitors (Dasatinib, PP2, SU6656) and an Aurora B kinase inhibitor (ZM447439).
  • Analysis of cell migration, invasion, proliferation, cell cycle progression, and protein phosphorylation (Fak, paxillin, p130CAS, caveolin-1, histone H3).
  • Gene expression profiling using hierarchical clustering and Gene Set Enrichment Analysis (GSEA).

Main Results:

  • Dasatinib, PP2, and SU6656 inhibited migration and invasion, reduced key phosphoproteins, and altered cytoskeletal structures.
  • Dasatinib and PP2 inhibited proliferation by arresting cells in G1–S transition via p27(Kip1) upregulation and c-Myc downregulation.
  • SU6656 induced polyploid multinucleated cells, indicating cytokinesis inhibition, and was identified as a dual inhibitor of SFKs and Aurora B kinase, distinct from Dasatinib and PP2.

Conclusions:

  • SFKs catalytic activity is essential for the proliferation, migration, and invasiveness of MDA-MB-231 breast cancer cells.
  • SU6656 exhibits a dual inhibitory effect on SFKs and Aurora B kinase, suggesting its potential as a therapeutic agent for breast cancer.
  • Differential mechanisms of SFK inhibition highlight the complexity of targeting these pathways in cancer therapy.

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