| Insufficient role of cell proliferation in aberrant DNA methylation induction and involvement of specific types of inflammation. | |
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MedLine Citation:
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PMID: 20980348 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Chronic inflammation is deeply involved in induction of aberrant DNA methylation, but it is unclear whether any type of persistent inflammation can induce methylation and how induction of cell proliferation is involved. In this study, Mongolian gerbils were treated with five kinds of inflammation inducers [Helicobacter pylori with cytotoxin-associated gene A (CagA), H.pylori without CagA, Helicobacter felis, 50% ethanol (EtOH) and saturated sodium chloride (NaCl) solution]. Two control groups were treated with a mutagenic carcinogen that induces little inflammation (20 p.p.m. of N-methyl-N-nitrosourea) and without any treatment. After 20 weeks, chronic inflammation with lymphocyte and macrophage infiltration was prominent in the three Helicobacter groups, whereas neutrophil infiltration was mainly observed in the EtOH and NaCl groups. Methylation levels of eight CpG islands significantly increased only in the three Helicobacter groups. By Ki-67 staining, cell proliferation was most strongly induced in the NaCl group, demonstrating that induction of cell proliferation is not sufficient for methylation induction. Among the inflammation-related genes, Il1b, Nos2 and Tnf showed increased expression specifically in the three Helicobacter groups. In human gastric mucosae infected by H.pylori, NOS2 and TNF were also increased. These data showed that inflammation due to infection of the three Helicobacter strains has a strong potential to induce methylation, regardless of their CagA statuses, and increased cell proliferation was not sufficient for methylation induction. It was suggested that specific types of inflammation characterized by expression of specific inflammation-related genes, along with increased cell proliferation, are necessary for methylation induction. |
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Authors:
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Keun Hur; Tohru Niwa; Takeshi Toyoda; Tetsuya Tsukamoto; Masae Tatematsu; Han-Kwang Yang; Toshikazu Ushijima |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-10-27 |
Journal Detail:
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Title: Carcinogenesis Volume: 32 ISSN: 1460-2180 ISO Abbreviation: Carcinogenesis Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2010-12-28 Completed Date: 2011-01-27 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8008055 Medline TA: Carcinogenesis Country: England |
Other Details:
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Languages: eng Pagination: 35-41 Citation Subset: IM |
Affiliation:
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National Cancer Center Research Institute, Chuo-ku, Tokyo, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Aged, 80 and over Animals Antigens, Bacterial / immunology Bacterial Proteins / immunology Cell Proliferation / drug effects DNA Methylation / physiology* Ethanol / toxicity Female Gastric Mucosa / drug effects, microbiology, pathology* Gastritis / genetics*, microbiology, pathology Gene Expression Gene Expression Regulation / drug effects Gerbillinae Helicobacter / immunology Helicobacter Infections / genetics, immunology, pathology Humans Inflammation / genetics*, microbiology, pathology Irritants / toxicity* Male Middle Aged Sodium Hydroxide / toxicity |
| Chemical | |
Reg. No./Substance:
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0/Antigens, Bacterial; 0/Bacterial Proteins; 0/Irritants; 0/cagA protein, Helicobacter pylori; 1310-73-2/Sodium Hydroxide; 64-17-5/Ethanol |
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