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Human Ccr4 and Caf1 Deadenylases Regulate Proliferation and Tumorigenicity of Human Gastric Cancer Cells via

Xiao-Hui Song1, Xiao-Yan Liao1, Xu-Ying Zheng1

  • 1State Key Laboratory of Membrane Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China.

Cancers
|March 6, 2021
PubMed

Insights

Targeting RNA metabolism by inhibiting human Ccr4a/b (hCcr4a/b) and Caf1a/b (hCaf1a/b) deadenylases disrupts cancer cell proliferation and tumorigenicity, offering a novel cancer treatment strategy.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Gene Regulation

Background:

  • Cancer cells exhibit altered gene expression for survival and metastasis.
  • Global RNA metabolism is a potential target for cancer therapy.
  • The Ccr4-Not complex, including deadenylases, plays a role in gene regulation.

Purpose of the Study:

  • To investigate the role of human Ccr4a/b (hCcr4a/b) and Caf1a/b (hCaf1a/b) deadenylases in cancer cell proliferation.
  • To explore the impact of depleting these deadenylases on cancer cell growth and tumorigenicity.
  • To elucidate the mechanisms by which these deadenylases affect cell cycle progression and RNA processing.

Main Methods:

  • Establishment of stable cell lines with knockdown of hCcr4a/b or hCaf1a/b.
  • Transient knockdown experiments in various cancer cell lines.
  • Cell cycle analysis (G0/G1 and G2/M phase arrest).
  • Analysis of CDK-cyclin inhibitors and p21 mRNA levels.
  • Assessment of processing-body formation.

Main Results:

  • Depletion of hCcr4a/b or hCaf1a/b significantly inhibited cancer cell proliferation and tumorigenicity.
  • Knockdown of hCaf1a caused G2/M phase arrest, while hCaf1b or hCcr4a/b depletion led to G0/G1 arrest.
  • The deadenylases modulated CDK-cyclin inhibitor levels, with hCcr4a/b specifically targeting p21 mRNA.
  • Depletion of any of the four deadenylases impaired processing-body formation.

Conclusions:

  • Perturbing global RNA metabolism by targeting hCcr4a/b and hCaf1a/b deadenylases severely affects cancer cell proliferation.
  • These deadenylases represent potential therapeutic targets for novel cancer treatments.
  • Modulation of RNA metabolism offers a promising new avenue for cancer therapy.
Keywords:
Caf1Ccr4Ccr4-Not complexcell cycle progressiondeadenylasemRNA decayp21processing bodystomach adenocarcinoma

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