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Gastrokine 1 Expression in the Human Gastric Mucosa Is Closely Associated with the Degree of Gastritis and DNA Methylation

  • Choi, Won Suk (Department of Pathology, The Catholic University of Korea, School of Medicine) ;
  • Seo, Ho Suk (Department of General Surgery, The Catholic University of Korea, School of Medicine) ;
  • Song, Kyo Young (Department of General Surgery, The Catholic University of Korea, School of Medicine) ;
  • Yoon, Jung Hwan (Department of Pathology, The Catholic University of Korea, School of Medicine) ;
  • Kim, Olga (Department of Pathology, The Catholic University of Korea, School of Medicine) ;
  • Nam, Suk Woo (Department of Pathology, The Catholic University of Korea, School of Medicine) ;
  • Lee, Jung Yong (Department of Pathology, The Catholic University of Korea, School of Medicine) ;
  • Park, Won Sang (Department of Pathology, The Catholic University of Korea, School of Medicine)
  • 투고 : 2013.12.02
  • 심사 : 2013.12.20
  • 발행 : 2013.12.30

초록

Purpose: Gastrokine 1 plays an important role in gastric mucosal defense. Additionally, the Gastrokine 1-miR-185-DNMT1 axis has been shown to suppress gastric carcinogenesis through regulation of epigenetic alteration. Here, we investigated the effects of Gastrokine 1 on DNA methylation and gastritis. Materials and Methods: Expression of Gastrokine 1, DNMT1, EZH2, and c-Myc proteins, and the presence of Helicobacter pylori CagA protein were determined in 55 non-neoplastic gastric mucosal tissue samples by western blot analysis. The CpG island methylation phenotype was also examined using six markers (p16, hMLH1, CDH1, MINT1, MINT2 and MINT31) by methylation-specific polymerase chain reaction. Histological gastritis was assessed according to the updated Sydney classification system. Results: Reduced Gastrokine 1 expression was found in 20 of the 55 (36.4%) gastric mucosal tissue samples and was closely associated with miR-185 expression. The Gastrokine 1 expression level was inversely correlated with that of DNMT1, EZH2, and c-Myc, and closely associated with the degree of gastritis. The H. pylori CagA protein was detected in 26 of the 55 (47.3%) gastric mucosal tissues and was positively associated with the expression of DNMT1, EZH2, and c-Myc. In addition, 30 (54.5%) and 23 (41.9%) of the gastric mucosal tissues could be classified as CpG island methylation phenotype-low and CpG island methylation phenotype-high, respectively. Reduced expression of Gastrokine 1 and miR-185, and increased expression of DNMT1, EZH2, and c-Myc were detected in the CpG island methylation phenotype-high gastric mucosa. Conclusions: Gastrokine 1 has a crucial role in gastric inflammation and DNA methylation in gastric mucosa.

키워드

참고문헌

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