Abstract
Background
Nodular gastritis (NG) is characterized by marked antral lymphoid follicle formation, and is a strong risk factor for diffuse-type gastric cancer in adults. However, it is unknown whether aberrant DNA methylation, which is induced by atrophic gastritis (AG) and is a risk for gastric cancer, is induced by NG. Here, we analyzed methylation induction by NG.
Methods
Gastric mucosal samples were obtained from non-cancerous antral tissues of 16 NG and 20 AG patients with gastric cancer and 5 NG and 6 AG patients without, all age- and gender-matched. Genome-wide methylation analysis and expression analysis were conducted by a BeadChip array and RNA-sequencing, respectively.
Results
Clustering analysis of non-cancerous antral tissues of NG and AG patients with gastric cancer was conducted using methylation levels of 585 promoter CpG islands (CGIs) of methylation-resistant genes, and a large fraction of NG samples formed a cluster with strong methylation induction. Promoter CGIs of CDH1 and DAPK1 tumor-suppressor genes were more methylated in NG than in AG. Notably, methylation levels of these genes were also higher in the antrum of NG patients without cancer. Genes related to lymphoid follicle formation, such as CXCL13/CXCR5 and CXCL12/CXCR4, had higher expression in NG, and genes involved in DNA demethylation TET2 and IDH1, had only half the expression in NG.
Conclusions
Severe aberrant methylation, involving multiple tumor-suppressor genes, was induced in the gastric antrum and body of patients with NG, in accordance with their high gastric cancer risk.
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Abbreviations
- NG:
-
Nodular gastritis
- H. pylori :
-
Helicobacter pylori
- AG:
-
Atrophic gastritis
- CGIs:
-
CpG islands
- DNMTs:
-
DNA methyltransferases
- NO:
-
Nitric oxide
- FFPE:
-
Formalin-fixed paraffin-embedded
- FF:
-
Fresh-frozen
- NBI:
-
Narrow Band Imaging
- qPCR:
-
Quantitative PCR
- HSD:
-
Highest standard deviation
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Acknowledgements
TU is a recipient of grants supported by AMED under Grant Nos. JP23ck0106804 and JP20gm1310006. HT is a recipient of a grant supported by JSPS KAKENHI under Grant No. JP21K07928. NY is a recipient of a Research Grant of the Princess Takamatsu Cancer Research Fund (ID: 19-25138) and JSPS KAKENHI under Grant No. JP21H03178.
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AS, HT, and TU conceived and designed the study. AS, HT, and YO carried out experiments. AS, HT, SY, and AH conducted data analysis. CI, JK, CT, MF, YF, NY, TA, HK, TK, CS, and KK collected clinical samples and WN supervised the pathological diagnosis and sample processing. AS, HT, TI, and TU wrote the manuscript. All authors read and approved the final manuscript.
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Sasaki, A., Takeshima, H., Yamashita, S. et al. Severe induction of aberrant DNA methylation by nodular gastritis in adults. J Gastroenterol (2024). https://doi.org/10.1007/s00535-024-02094-y
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DOI: https://doi.org/10.1007/s00535-024-02094-y