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TRIM32/USP11 Balances ARID1A Stability and the Oncogenic/Tumor-Suppressive Status of Squamous Cell Carcinoma

Qingyu Luo1, Xiaowei Wu1, Yabing Nan1

  • 1State Key Laboratory of Molecular Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China.

Cell Reports
|January 9, 2020
PubMed

Insights

Excessive protein degradation causes loss of ARID1A in squamous cell carcinoma (SCC). The TRIM32/USP11-ARID1A-SDC2 pathway regulates SCC progression and offers potential therapeutic targets.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Squamous cell carcinoma (SCC) is an aggressive epithelial cancer with poorly understood molecular drivers.
  • ARID1A mutations are common in cancers, but its expression is paradoxically low in SCC, suggesting post-transcriptional regulation.
  • The ubiquitin-proteasome system (UPS) is a key regulator of protein stability and cellular processes.

Purpose of the Study:

  • To elucidate the molecular mechanisms responsible for ARID1A loss in SCC.
  • To investigate the role of the UPS in regulating ARID1A expression in SCC.
  • To identify key proteins involved in ARID1A stability and their impact on SCC progression.

Main Methods:

  • Utilized cell culture models of SCC.
  • Investigated the role of the ubiquitin-proteasome system (UPS) in ARID1A regulation.
  • Assessed the function of E3 ligase TRIM32 and deubiquitinase USP11 on ARID1A stability.
  • Analyzed the downstream effects of ARID1A modulation on SCC cell proliferation, metastasis, and chemoresistance.
  • Identified syndecan-2 (SDC2) as a downstream target.

Main Results:

  • Excessive UPS-mediated protein degradation contributes to ARID1A loss in SCC.
  • TRIM32 stabilizes ARID1A, inhibiting SCC proliferation, metastasis, and chemoresistance.
  • USP11 promotes ARID1A degradation, thereby driving SCC development.
  • SDC2 acts as a downstream effector, mediating the oncogenic function of ARID1A loss.
  • The TRIM32/USP11-ARID1A-SDC2 axis is crucial for SCC pathogenesis.

Conclusions:

  • UPS-mediated degradation is a critical mechanism for ARID1A loss in SCC.
  • The identified TRIM32/USP11-ARID1A-SDC2 axis represents a novel regulatory pathway in SCC.
  • Targeting this axis holds potential for SCC therapeutic strategies.
Keywords:
ARID1ATRIM32USP11deubiquitinationsquamous cell carcinomatumor suppressorubiquitination

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