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p53 Gain-of-Function Mutation Induces Metastasis via BRD4-Dependent CSF-1 Expression.

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Summary
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A novel pathway involving the p53-R172H-dependent BRD4-CSF-1 axis promotes esophageal squamous cell carcinoma (ESCC) lung metastasis. Inhibiting this axis reduces tumor invasion and metastasis, offering new therapeutic strategies for ESCC.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Metastasis

Background:

  • TP53 mutations are common in esophageal squamous cell carcinoma (ESCC) and linked to metastasis.
  • Colony-stimulating factor-1 (CSF-1) expression is elevated in metastatic ESCC lesions, particularly in a p53-R172H-dependent manner.

Purpose of the Study:

  • To investigate the role of the p53-R172H-dependent CSF-1 signaling pathway in ESCC lung metastasis.
  • To identify therapeutic targets within this pathway for treating ESCC.

Main Methods:

  • Analysis of CSF-1 expression in metastatic ESCC lesions.
  • Investigating the interaction between p53, BRD4, and the Csf-1 promoter.
  • Assessing the effect of BRD4 inhibition on tumor invasion and metastasis in vivo.
  • Measuring circulating CSF-1 levels after BRD4 inhibition.

Main Results:

  • p53-R172H-dependent CSF-1 signaling promotes tumor cell invasion and lung metastasis via Stat3 phosphorylation and epithelial-to-mesenchymal transition (EMT).
  • p53 directly binds to the Csf-1 promoter, and BRD4 facilitates this interaction to regulate Csf-1 transcription.
  • Inhibition of BRD4 significantly reduces ESCC tumor invasion, lung metastasis, and circulating CSF-1 levels.
  • The identified BRD4-CSF-1 axis correlates with patient survival and tumor stage.

Conclusions:

  • A novel p53-R172H-dependent BRD4-CSF-1 axis drives ESCC lung metastasis.
  • Targeting this axis offers a promising therapeutic strategy for managing ESCC metastasis.