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Regulation of CD44E by DARPP-32-dependent activation of SRp20 splicing factor in gastric tumorigenesis

S Zhu1, Z Chen1, A Katsha1

  • 1Department of Surgery, Vanderbilt University Medical Center, Nashville, TN, USA.

Oncogene
|June 30, 2015
PubMed

Insights

Dopamine and cyclic adenosine monophosphate-regulated phosphoprotein (DARPP-32) promotes gastric cancer growth by regulating CD44E splicing via the SRp20 factor. This DARPP-32-SRp20 pathway is a key driver of gastric tumorigenesis.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cellular Biology

Background:

  • CD44 variant CD44E is overexpressed in gastric cancer, but its regulatory mechanisms remain unclear.
  • Understanding CD44 splicing regulation is crucial for developing targeted gastric cancer therapies.

Purpose of the Study:

  • To investigate the role of DARPP-32 in regulating CD44 splicing and its impact on gastric tumor growth.
  • To elucidate the molecular mechanisms by which DARPP-32 influences CD44E expression.

Main Methods:

  • Western blot and qRT-PCR to assess protein and gene expression.
  • Quantitative splicing luciferase reporter assays to measure splicing activity.
  • Tumor xenograft mouse models to evaluate in vivo effects.
  • Immunoprecipitation and immunoblotting to study protein interactions and stability.

Main Results:

  • Knockdown of DARPP-32 significantly reduced CD44E expression and splicing activity.
  • DARPP-32 was found to regulate the stability and expression of the SRp20 splicing factor.
  • DARPP-32 knockdown suppressed tumor growth in mice, which was rescued by SRp20 re-expression.
  • Co-overexpression of DARPP-32, SRp20, and CD44E was observed in human gastric tumors.

Conclusions:

  • DARPP-32 plays a critical role in promoting gastric cancer progression by regulating CD44E splicing.
  • The DARPP-32-SRp20 axis is a novel pathway involved in gastric tumorigenesis.
  • Targeting this axis may offer a new therapeutic strategy for gastric cancer.

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