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A feedforward loop between STAT1 and YAP1 stimulates lipid biosynthesis, accelerates tumor growth, and promotes

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STAT1 promotes colorectal tumor growth and survival in KRAS-mutant cancers by boosting lipid production. Targeting the STAT1-YAP1 pathway offers a new strategy against therapy-resistant KRAS-mutant colon cancer.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Signal transducer and activator of transcription 1 (STAT1) traditionally has anti-tumor roles.
  • In tumorous conditions, STAT1 can exhibit pro-survival functions through unclear mechanisms.
  • Mutant KRAS is a key driver in many colorectal cancers, often associated with poor prognosis.

Purpose of the Study:

  • To investigate the specific role of STAT1 in colorectal tumor cells with wild-type or mutant KRAS.
  • To elucidate the molecular mechanisms by which STAT1 promotes tumor survival and proliferation in the context of mutant KRAS.
  • To identify potential therapeutic targets for mutant KRAS colorectal cancer.

Main Methods:

  • Utilized isogenic colorectal tumor cell lines with wild-type or mutant KRAS.
  • Performed gene expression profiling to identify STAT1-regulated genes.
  • Investigated the role of STAT1 phosphorylation at S727 and its impact on lipid biosynthesis pathways.
  • Analyzed the STAT1-YAP1-TEAD4 axis and its contribution to therapy resistance.

Main Results:

  • STAT1 specifically promotes survival and proliferation in mutant KRAS colorectal tumor cells.
  • STAT1 upregulates sterol and lipid biosynthesis genes, including SREBP1 and SREBP2, in a STAT1 S727 phosphorylation-dependent manner.
  • A positive feedback loop involving STAT1, YAP1, and TEAD4 amplifies lipid production and tumor growth in mutant KRAS cells.
  • The STAT1-YAP1 axis confers resistance to mevalonate pathway inhibitors and EGFR-targeted therapy in mutant KRAS colon cancer.

Conclusions:

  • STAT1 plays a critical pro-survival role in mutant KRAS colorectal cancer by promoting lipid biosynthesis.
  • The STAT1-YAP1 pathway is a key mediator of therapy resistance in this context.
  • Targeting the STAT1-YAP1 interaction presents a promising therapeutic strategy for mutant KRAS colorectal cancer.