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Oxidative Stress-Responsive 1 Kinase Catalytic Activity Promotes Triple Negative Breast Cancer Oncogenic Potential.

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The protein kinase OSR1 promotes breast cancer cell migration and invasion, particularly in triple-negative breast cancer (TNBC). Inhibiting OSR1 offers a potential therapeutic strategy to reduce TNBC

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Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Oxidative stress response 1 (OSR1) is a protein kinase implicated as a poor prognostic biomarker in breast cancer (BC).
  • Understanding OSR1's role in BC pathogenesis is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the expression, phosphorylation, and activity of OSR1 in various breast cancer cell lines.
  • To determine the functional role of OSR1 in breast cancer cell migration and invasion.
  • To evaluate OSR1 as a potential therapeutic target for triple-negative breast cancer (TNBC).

Main Methods:

  • Analysis of OSR1 expression, phosphorylation status, and kinase activity in luminal and triple-negative BC cell lines.
  • Utilizing the WNK/OSR1 inhibitor WNK463 to assess the impact of OSR1 inhibition on cell viability, migration, and invasion.
  • Overexpression of constitutively active OSR1 in MCF7 cells to study its effect on cell mobility.

Main Results:

  • OSR1 is expressed in luminal and TNBC cell lines, with constitutive activity observed in the highly migratory MDA-MB-231 (TNBC) cell line.
  • OSR1 activity in MDA-MB-231 cells is independent of p53 mutations.
  • Inhibition of OSR1 significantly attenuated cell migration and invasion in MDA-MB-231 cells without affecting viability.
  • Overexpression of active OSR1 enhanced cell mobility in MCF7 cells.

Conclusions:

  • OSR1 plays a critical role in promoting breast cancer cell migration and invasion, particularly in TNBC.
  • Pharmacological inhibition of OSR1 presents a promising therapeutic strategy to counteract the oncogenic potential of TNBC.
  • Targeting OSR1 could be a novel approach to prevent metastasis in aggressive breast cancer subtypes.