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Integrin α6β4 Confers Doxorubicin Resistance in Cancer Cells by Suppressing Caspase-3-Mediated Apoptosis: Involvement

Yoshinobu Kariya1, Jianguo Gu2, Yukiko Kariya3

  • 1Department of Biochemistry, Fukushima Medical University, Fukushima City 960-1295, Japan.

Biomolecules
|December 23, 2023
PubMed

Insights

Alpha-6-beta-4 integrin (α6β4 integrin) promotes cancer cell resistance to doxorubicin chemotherapy by inhibiting apoptosis. N-glycans on β4 integrin are key regulators of this chemoresistance mechanism.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Drug resistance is a significant challenge in cancer therapy.
  • Understanding the molecular basis of chemoresistance is crucial for developing effective treatments.
  • The role of α6β4 integrin in chemoresistance was previously unclear.

Purpose of the Study:

  • To investigate the direct involvement of α6β4 integrin in doxorubicin resistance.
  • To elucidate the molecular mechanisms by which α6β4 integrin influences chemoresistance.
  • To determine the role of N-glycans on β4 integrin in regulating chemoresistance.

Main Methods:

  • Overexpression of α6β4 integrin in MDA-MB435S and Panc-1 cancer cell lines.
  • Utilized β4 integrin mutants lacking the cytoplasmic signal domain.
  • Employed N-glycan-defective β4 integrin mutants and N-acetylglucosaminyltransferase III co-expression.
  • Assessed apoptosis via caspase-3 activation and measured cell viability.

Main Results:

  • Overexpression of α6β4 integrin conferred significant resistance to doxorubicin in cancer cells.
  • Deletion of the cytoplasmic signal domain in β4 integrin abolished doxorubicin resistance.
  • Modifications in N-glycan structures on β4 integrin also impacted doxorubicin resistance.
  • Reduced cell viability and increased caspase-3 activation were observed upon abrogation of α6β4 integrin-mediated resistance.

Conclusions:

  • α6β4 integrin signaling is a key mediator of doxorubicin resistance in cancer cells.
  • N-glycans attached to β4 integrin play a critical role in regulating this resistance.
  • Targeting α6β4 integrin and its glycosylation may offer novel therapeutic strategies against chemoresistant cancers.
Keywords:
N-acetylglucosaminyltransferase III (GnT-III)bisecting GlcNAccaspase-3chemoresistancedoxorubicinα6β4 integrin

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