Cited by 86Cytokine Signaling Pathways and InteractionsPancreatic and Hepatic Oncology ResearchEpigenetics and DNA Methylation

RETRACTED ARTICLE: Transcriptional repression of SOCS3 mediated by IL-6/STAT3 signaling via DNMT1 promotes pancreatic cancer growth and metastasis

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Huang, Li, Hu, Bin, Ni, Jianbo, Wu, Jianghong, Jiang, Weiliang, Chen, Congying, Yang, Lijuan, Zeng, Yue +3 more·2016·Journal of Experimental & Clinical Cancer Research

Abstract

Background: Previous studies have investigated the sustained aberrantly activated Interleukin-6 (IL-6)/signal transducer and activator of transcription 3 (STAT3) signaling pathway is crucial for pancreatic cancer growth and metastasis. Suppressor of cytokine signaling 3 (SOCS3), as a key negative feedback regulator of this signaling pathway, is usually down-regulated in various cancers. In the present study, we aim at exploring the biological function and the underlying molecular regulation mechanisms of SOCS3 in pancreatic cancer. Methods: The expression of SOCS3 and other genes in pancreatic cancer was examined by Quantitative real-time PCR, western blotting and immunohistochemical staining. The interaction between pSTAT3 and DNA Methyltransferase 1 (DNMT1) was investigated by co-immunoprecipitation assay. Luciferase reporter assay was used to investigate the transcriptional regulation of pSTAT3 and DNMT1 on the SOCS3 gene. The effects of SOCS3 on the biological behavior of pancreatic cancer cells were assessed both in vitro and vivo. Furthermore, we performed a comprehensive analysis of the expression of SOCS3 in a pancreatic cancer tissue microarray (TMA) and correlated our findings with pathological parameters and outcomes of the patients. Results: We showed that SOCS3 expression was decreased in phosphorylated STAT3 (pSTAT3)-positive tumors and was negatively correlated with pSTAT3 in pancreatic cancer cells. We also found that IL-6/STAT3 promoted SOCS3 promoter hypermethylation by increasing DNMT1 activity; silencing DNMT1 or 5-aza-2-deoxycytidine (5-AZA) treatment could reverse the down-regulation of SOCS3 mediated by IL-6. Using co-immunoprecipitation and luciferase reporter assays, we found that STAT3 recruited DNMT1 to the promoter region of SOCS3 and inhibited its transcriptional activity. Overexpression of SOCS3 significantly inhibited cell proliferation, which may be due to the increase in G1-S phase arrest; overexpression of SOCS3 also inhibited cell migration and invasion as well as tumorigenicity in nude mice. Pancreatic cancer tissue microarray analysis showed that high SOCS3 expression was a good prognostic factor and negatively correlated with tumor volume and metastasis. Conclusion: We demonstrated that activated IL-6/STAT3 signaling could induce SOCS3 methylation via DNMT1, which led to pancreatic cancer growth and metastasis. These data also provided a mechanistic link between sustained aberrantly activated IL-6/STAT3 signaling and SOCS3 down-regulation in pancreatic cancer. Thus, inhibitors of STAT3 or DNMT1 may become novel strategies for treating pancreatic cancer.

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  • At the molecular level, IL-6 increases the activity of DNMT1 with activating effects on JAK/STAT3, NF-κB and PI3K/AKT/mTOR signaling pathways, affecting regulation of autophagy-related functions required to maintain cellular homeostasis under stress such as a prenatal insult.

    “At the molecular level, IL-6 increases the activity of DNA methyltransferases 1 (DNMT1) with activating effects on the JAK/STAT3, NF-κB and PI3K/AKT/mTOR signaling pathways [144–148] affecting the regulation of autophagy-related functions, that are required to maintain cellular homeostasis under stress [149], such as a prenatal insult.”

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Authors
Huang, L., Hu, B., Ni, J., Wu, J., Jiang, W., Chen, C., Yang, L., Zeng, Y., Wan, R., Hu, G., & Wang, X.
Affiliations
Shanghai Jiao Tong University (CN)
Corresponding author
  • Hu, Guoyong
  • Wang, Xingpeng
Venue
Journal of Experimental & Clinical Cancer Research
Published
2016-02-04
Volume
35
Issue
1
Pages
27-27
ISSN
  • 0392-9078 (ISSN-L)
  • 1756-9966
OpenAlex
W2299967230
Cited by
86
References
57
Citations by year
2025: 1 · 2024: 2 · 2023: 6 · 2022: 12 · 2021: 13 · 2020: 17 · 2019: 10 · 2018: 12 · 2017: 9 · 2016: 4
FWCI
6.29
Type
journal article
Language
en
Status
Retracted
Open access
Locations
  • Journal of Experimental & Clinical Cancer Research (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
National Natural Science Foundation of China (81372643, 81370568)
Topics
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Health Sciences › Medicine › Oncology › Pancreatic and Hepatic Oncology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
Keywords
SOCS3, IL-6/STAT3 signaling, DNMT1, DNA methylation, promoter hypermethylation, transcriptional repression, pancreatic cancer, tumor growth, metastasis, prognostic factors, decitabine, G1/S cell cycle arrest, cell migration and invasion, negative feedback regulation, retracted article, DNA methyltransferases
MeSH terms
Suppressor of Cytokine Signaling 3 Protein, DNA (Cytosine-5-)-Methyltransferase 1, Animals, DNA (Cytosine-5-)-Methyltransferases, Female, Humans, Male, Neoplasm Metastasis, Neoplasm Transplantation, Pancreatic Neoplasms, Transcription, Genetic, Signal Transduction, Interleukin-6, Gene Expression Regulation, Neoplastic, DNA Methylation, Cell Line, Tumor, STAT3 Transcription Factor, Suppressor of Cytokine Signaling Proteins, Mice

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