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Snail/beta-catenin signaling protects breast cancer cells from hypoxia attack

Alexander M Scherbakov1, Lidia B Stefanova, Danila V Sorokin

  • 1Laboratory of Clinical Biochemistry, Institute of Clinical Oncology, N.N. Blokhin Cancer Research Centre, Kashirskoye sh. 24, Moscow 115478, Russia.

Experimental Cell Research
|August 27, 2013
PubMed

Insights

Snail1 and beta-catenin protect breast cancer cells from hypoxia by regulating growth and apoptotic pathways. These proteins, along with AMPK phosphorylation levels, may predict tumor response to anti-angiogenic drugs.

Area of Science:

  • Cancer Biology
  • Molecular Oncology
  • Cellular Signaling

Background:

  • Hypoxia tolerance in cancer involves glycolysis and growth pathways, but the role of epithelial-mesenchymal transition (EMT) remains less understood.
  • Snail1 is a key EMT pathway protein known to be activated by hypoxia and involved in hormone resistance in breast cancer cells.
  • Estrogen-independent HBL-100 cells exhibit higher Snail1 expression than estrogen-dependent MCF-7 cells.

Purpose of the Study:

  • To investigate the role of Snail signaling in mediating hypoxia response and regulating breast cancer cell sensitivity to hypoxia.
  • To explore the protective mechanisms of Snail1 against hypoxia-induced growth suppression.
  • To examine the relationship between Snail/beta-catenin signaling, AMPK activity, and hypoxia tolerance.

Main Methods:

  • In vitro culture of HBL-100 and MCF-7 breast cancer cell lines under normoxic and hypoxic conditions (1% O2).
  • Snail1 knockdown using RNA interference.
  • Analysis of cell viability, proliferation, beta-catenin levels, HIF-1-dependent gene expression, and AMPK phosphorylation.
  • Comparison of protein expression and signaling pathways between Snail1-enriched and control cell lines.

Main Results:

  • Snail1-enriched HBL-100 cells showed significantly higher viability (71%) under hypoxia compared to MCF-7 cells (31%).
  • Snail1 knockdown increased hypoxia-induced growth inhibition, confirming Snail1's protective role.
  • Snail1's protective effect was partly mediated by beta-catenin, which positively regulated HIF-1-dependent genes.
  • Hypoxia tolerance correlated with decreased AMPK phosphorylation, indicating an inverse relationship with Snail/beta-catenin signaling.

Conclusions:

  • Snail1 and beta-catenin protect breast cancer cells from hypoxia, independent of hormone dependence.
  • These proteins represent potential therapeutic targets for overcoming hypoxia-driven resistance in breast cancer.
  • AMPK phosphorylation levels, alongside Snail1 and beta-catenin expression, may serve as predictive biomarkers for anti-angiogenic therapy response.
Keywords:
3-[4,5–dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide5′-adenosine monophosphate-activated protein kinaseAMPKBeta-cateninBreast cancerDL-dithiothreitolDTTEDTAEMTER alphaEpithelial-mesenchymal transitionFCSHIF-1HREHypoxiaMTA3MTTPBSPFAPMSFSnail1T-cell-specific transcription factorTBSTCFTRITCTris-buffered salineepithelial-mesenchymal transitionestrogen receptor alphaethylenediaminetetraacetic acidfetal calf serumhypoxia-inducible factor-1hypoxia-responsive elementmetastasis-associated protein 3paraformaldehydephenylmethanesulfonyl fluoridephosphate buffered salinesiRNAsmall interfering RNAtetramethylrhodamine isothiocyanate mixed isomers

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