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LncRNA625 inhibits STAT1-mediated transactivation potential in esophageal cancer cells

Huang Guo-Wei1, Li Chun-Quan2, Liao Lian-Di3

  • 1Institute of Oncologic Pathology, Shantou University Medical College, Shantou, Guangdong, 515041, PR China; The Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area, Shantou University Medical College, Shantou, Guangdong, 515041, PR China; Department of Biochemistry and Molecular Biology, Shantou University Medical College, Shantou, Guangdong, 515041, PR China.

The International Journal of Biochemistry & Cell Biology
|October 13, 2019
PubMed

Insights

Long non-coding RNA lncRNA625 inhibits Signal transducer and activator of transcription 1 (STAT1) activity in cancer. LncRNA625 promotes STAT1 dephosphorylation by forming complexes with TC45, reducing STAT1-mediated transcription.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • RNA Biology

Background:

  • Signal transducer and activator of transcription 1 (STAT1) activity is often inhibited in cancer cells, but the underlying mechanisms remain unclear.
  • Understanding how STAT1 activity is regulated is crucial for developing targeted cancer therapies.

Purpose of the Study:

  • To investigate the role of long non-coding RNA lncRNA625 in regulating STAT1 activity.
  • To elucidate the molecular mechanism by which lncRNA625 affects STAT1-mediated transcription.

Main Methods:

  • Quantitative real-time PCR to assess gene expression.
  • Reporter gene assays to measure STAT1 transcriptional activity.
  • Co-immunoprecipitation to study protein-protein interactions.
  • Western blotting to detect protein phosphorylation status.

Main Results:

  • Knockdown of lncRNA625 led to increased STAT1-mediated transcription and IFITM2 expression.
  • Upregulation of lncRNA625 inhibited STAT1 reporter activity.
  • LncRNA625 was found to inhibit STAT1 binding to the IFITM2 promoter.
  • LncRNA625 interacted with the DNA-binding domain of STAT1 and promoted its interaction with TC45, leading to pSTAT1 dephosphorylation.

Conclusions:

  • LncRNA625 acts as a negative regulator of STAT1 activity in cancer cells.
  • LncRNA625 inhibits STAT1-mediated transactivation by facilitating STAT1 dephosphorylation via the TC45 phosphatase.
  • This mechanism involves the formation of a STAT1-TC45 complex induced by lncRNA625.
Keywords:
IFITM2InteractionLncRNA625STAT1TC45

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