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Helicobacter pylori is associated with miR-133a expression through promoter methylation in gastric carcinogenesis : 헬리코박터 파일로리가 위암 발병에서 프로모터 메틸화를 통해 miR-133a 발현에 미치는 영향
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- Authors
- Advisor
- 김상균
- Major
- 의과대학 의학과
- Issue Date
- 2018-02
- Publisher
- 서울대학교 대학원
- Keywords
- Helicobacter pylori ; methylation ; microRNA ; gastric cancer
- Description
- 학위논문 (박사)-- 서울대학교 대학원 : 의과대학 의학과, 2018. 2. 김상균.
- Abstract
- Background/Aims: To investigate whether Helicobacter pylori eradication can reverse epigenetic silencing of miRNAs which are associated with H. pylori-induced gastric carcinogenesis.
Methods: We examined expression and promoter methylation of miR-34b/c, miR-133a, let-7a, and let-7i in gastric cancer cell line, before/after demethylation. Among them, epigenetically controlled miRNAs were identified. Their expression and promoter methylation was examined in human tissues of H. pylori-positive gastric cancer(T), H. pylori-positive gastritis(H), and H. pylori-negative controls(C). We also compared changes of miRNA expression and promoter methylation in H. pylori-positive patients who were endoscopically treated for early gastric cancer, between baseline and 1 year later according to eradication status.
Results: In gastric cancer cell line, miR-34b/c, and miR-133a showed epigenetic silencing. In human tissues, miR-34b/c and miR-133a showed serial increase of promoter methylation in order of C, H, and T (all, p<0.01), and the miR-133a expression showed serial decrease (C vs. H, p=.02
H vs. T, 0.01
C vs T
p<0.01) while miR-34b and miR-34c expressions did not. H. pylori eradication induced decrease of methylation (p<0.01) and increase of miR-133a expression (p=0.03), compared with non-eradication group.
Conclusions: This result suggests H. pylori eradication could reverse methylation-silencing of miR-133a which is involved in H. pylori-induced gastric carcinogenesis.
- Language
- English
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