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SOCS1 blocks G1-S transition in hepatocellular carcinoma by reducing the stability of the CyclinD1/CDK4 complex in

Jun Ding1,2,3,4, Kangdi Xu2,3,4,5, Suwan Sun6,7,8

  • 1Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China.

Aging
|February 26, 2020
PubMed

Insights

Suppressor of cytokine signalling 1 (SOCS1) inhibits hepatocellular carcinoma (HCC) progression by arresting the cell cycle. Upregulating SOCS1 may enhance combined therapies with CDK inhibitors for improved cancer treatment.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Cycle Regulation

Background:

  • Cyclin-dependent kinase (CDK) inhibitors are approved for various cancers.
  • Developing combination therapies with CDK inhibitors can improve therapeutic outcomes.
  • The role of suppressor of cytokine signalling 1 (SOCS1) in hepatocellular carcinoma (HCC) requires further elucidation.

Purpose of the Study:

  • To investigate the function of SOCS1 in hepatocellular carcinoma (HCC) cell and mouse models.
  • To explore the mechanism by which SOCS1 influences cell cycle progression in HCC.
  • To evaluate SOCS1 as a potential prognostic biomarker and therapeutic target in HCC.

Main Methods:

  • Utilized HCC cell line models and a xenograft mouse model.
  • Artificially upregulated SOCS1 expression to observe its effects.
  • Analyzed cell cycle progression, protein levels (CyclinD1, P21), and protein stability.
  • Assessed SOCS1 as a prognostic indicator for tumour size and patient survival.

Main Results:

  • Artificial upregulation of SOCS1 expression induced G1-S cell cycle arrest in HCC cell lines.
  • Increased SOCS1 led to elevated total CyclinD1 but decreased effective CyclinD1 proportion.
  • P21-mediated degradation of nuclear CyclinD1 was identified as a mechanism for cell cycle inhibition.
  • Increased P21 expression correlated with decreased levels of CyclinD1-inactivating components, suggesting a partial cancer-promoting role for P21.
  • SOCS1 expression levels correlated with favourable prognosis, smaller tumour size, and better long-term survival.

Conclusions:

  • SOCS1 plays a crucial role in inhibiting HCC cell cycle progression.
  • SOCS1 acts as a potential prognostic biomarker for HCC.
  • SOCS1 is a promising therapeutic target for combination therapy with CDK inhibitors in HCC treatment.
Keywords:
CyclinD1cell cyclecell proliferationhepatocellular carcinoma (HCC)suppressor of cytokine signalling 1 (SOCS1)

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