Cited by 178Epigenetics and DNA MethylationHead and Neck Cancer StudiesOral Health Pathology and Treatment

Interleukin‐6 promotes tumorigenesis by altering DNA methylation in oral cancer cells

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Gasche, Jacqueline A., Hoffmann, Jürgen, Boland, C. Richard, Goel, Ajay·2011·International Journal of Cancer

Abstract

Worldwide oral squamous cell carcinoma (OSCC) accounts for more than 100,000 deaths each year. Chronic inflammation constitutes one of the key risk factors for OSCC. Accumulating evidence suggests that aberrant DNA methylation may contribute to OSCC tumorigenesis. This study investigated whether chronic inflammation alters DNA methylation and expression of cancer-associated genes in OSCC. We established an in vitro model of interleukin (IL)-6 mediating chronic inflammation in OSCC cell lines. Thereafter, we measured the ability of IL-6 to induce global hypomethylation of long interspersed nuclear element-1 (LINE-1) sequences, as well as CpG methylation changes using multiple methodologies including quantitative pyrosequencing, methylation-specific multiplex ligation-dependent probe amplification and sensitive melting analysis after real-time-methylation-specific polymerase chain reaction (PCR). Gene expression was investigated by quantitative reverse transcriptase-PCR. IL-6 induced significant global LINE-1 hypomethylation (p=0.016) in our in vitro model of inflammatory stress in OSCC cell lines. Simultaneously, IL-6 induced CpG promoter methylation changes in several important putative tumor suppressor genes including CHFR, GATA5 and PAX6. Methylation changes correlated inversely with the changes in the expression of corresponding genes. Our results indicate that IL-6-induced inflammation promotes tumorigenesis in the oral cavity by altering global LINE-1 hypomethylation. In addition, concurrent hypermethylation of multiple tumor suppressor genes by IL-6 suggests that epigenetic gene silencing may be an important consequence of chronic inflammation in the oral cavity. These findings have clinical relevance, as both methylation and inflammation are suitable targets for developing novel preventive and therapeutic measures.

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  • IL-6 via STAT-3 promotes tumor cell proliferation in many cancers, including oral squamous cell carcinoma via DNA hypomethylation, prostate cancer through androgen receptor activation, and colon cancer.

    “IL-6 via STAT-3 has been shown to promote tumor cell proliferation in many cancers, including oral squamous cell carcinoma via DNA hypomethylation (31), prostate cancer through androgen receptor activation (32), and colon cancer (33).”

    From Tumor-Induced Inflammatory Cytokines and the Emerging Diagnostic Devices for Cancer Detection and Prognosis (2021) · cites this paper as [31]

    The Results report that IL-6 activates STAT3 and induces LINE-1 hypomethylation in oral squamous cell carcinoma cell lines. The Discussion says this may contribute to oral tumorigenesis, but the paper does not establish that hypomethylation promotes tumor-cell proliferation. Citation (31) is attached to the oral-cancer clause; the prostate- and colon-cancer clauses have separate citations. (LLM, conf=0.88)

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Authors
Gasche, J. A., Hoffmann, J., Boland, C. R., & Goel, A.
Affiliations
  • Baylor University Medical Center (US)
  • University Hospital Heidelberg (DE)
Corresponding author
  • Boland, C. Richard
  • Goel, Ajay
Venue
International Journal of Cancer
Publisher
Wiley
Published
2011-01-07
Volume
129
Issue
5
Pages
1053-1063
ISSN
  • 0020-7136 (ISSN-L)
  • 1097-0215
OpenAlex
W2006992975
Cited by
178
References
51
Citations by year
2026: 1 · 2025: 9 · 2024: 7 · 2023: 10 · 2022: 14 · 2021: 12 · 2020: 10 · 2019: 15 · 2018: 18 · 2017: 10 · 2016: 11 · 2015: 14 · 2014: 15 · 2013: 9 · 2012: 15
FWCI
4.17
Type
journal article
Language
en
Open access
Locations
  • International Journal of Cancer (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Texas A and M University
  • University of Pittsburgh
  • Universität Wien
  • National Institutes of Health
  • National Cancer Institute (R01-CA-72851, CA72851, R01CA072851, R01CA129286, CA129286)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Health Sciences › Medicine › Otorhinolaryngology › Head and Neck Cancer Studies
  • Health Sciences › Dentistry › Periodontics › Oral Health Pathology and Treatment
Keywords
interleukin-6, oral squamous cell carcinoma, DNA methylation, LINE-1 hypomethylation, chronic inflammation, tumor suppressor, promoter hypermethylation, epigenetic silencing, CHFR, GATA5, Pax6, carcinogenesis
MeSH terms
Carcinoma, Squamous Cell, DNA, Neoplasm, Humans, Inflammation, Mouth Neoplasms, Phosphorylation, Promoter Regions, Genetic, RNA, Messenger, Tumor Cells, Cultured, Interleukin-6, Gene Expression Regulation, Neoplastic, Polymerase Chain Reaction, Genes, Tumor Suppressor, CpG Islands, DNA Methylation, Long Interspersed Nucleotide Elements, Reverse Transcriptase Polymerase Chain Reaction, STAT3 Transcription Factor, Epigenomics

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