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RelA-Induced Interferon Response Negatively Regulates Proliferation.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Oncology

Background:

  • The Nuclear Factor kappa B (NF-kB) pathway exhibits dual roles, acting as both an oncogene and a tumor suppressor, influencing cell proliferation.
  • The precise molecular mechanisms dictating NF-kB's opposing effects on proliferation remain incompletely understood.

Purpose of the Study:

  • To elucidate the molecular determinants governing the anti-proliferative functions of the NF-kB pathway in human mammary epithelial cells (HMEC).
  • To investigate the role of the RelA-IRF1-CDK4 signaling axis in ER+/HER2- breast tumors and its implications for therapeutic response.

Main Methods:

  • Utilized primary human mammary epithelial cells (HMEC) as a model system.
  • Analyzed The Cancer Genome Atlas (TCGA) data for ER+/HER2- breast tumors.
  • Performed immuno-histochemical analysis on breast tumor samples.

Main Results:

  • Increased RelA levels induce IRF1, which upregulates STAT1 and IRF7, activating interferon response genes, leading to cell cycle arrest via CDK4 downregulation and p27 upregulation.
  • The anti-proliferative RelA-IRF1-CDK4 axis is conserved in ER+/HER2- breast tumors, with higher RelA levels correlating with lower proliferation rates.
  • Disruptions in this axis, including Rb inactivation or altered levels of RelA, IRF1, CDK4, or IRF2, are observed in aggressive tumors.

Conclusions:

  • Basal activity of RelA confers an anti-proliferative tumor-suppressor role by inducing the interferon pathway.
  • The RelA-IRF1-CDK4 axis represents a critical pathway in breast cancer, and its activity may predict response to CDK4/6 inhibitors in ER+ Rb-competent tumors.