title: Effect of polymorphisms of IL-17A, -17F and MIF genes on CpG island hyper-methylation (CIHM) in the human gastric mucosa.
abstract: CpG island hyper-methylation (CIHM) is one of the major events in the gastric carcinogenesis and also occurs in non-neoplastic gastric mucosa. IL-17A, -17F and MIF have a crucial role in the gastric inflammation and carcinogenesis. The CIHM status in the non-cancerous gastric mucosa, in relation to IL-17A (-197G>A, rs2275913), -17F (7488T>C, rs763780) and MIF (-173G>C and -794 tetranucleotide repeats) polymorphisms was investigated. Gastric mucosa samples were obtained from 121 cancer free subjects. CIHM of p14, p16, DAP-kinase and CDH1 genes were determined by methylation-specific polymerase chain reaction (MSP). CIHM high was defined as three or all CpG islands methylated. We employed the PCR-SSCP (multiplex PCR for IL-17A and -17F) method to detect the gene polymorphisms. No association were found between CIHM status and L-17A (-197G>A), IL-17F (7488T>C) and MIF (-173G>C) polymorphisms. MIF 5-CATT repeat carrier (5/5+5/6+5/7) held a significantly higher risk of CIHM of DAP-kinase (OR=2.33, 95% CI=1.07-5.09, p=0.03) and CIHM high (OR=3.63, 95% CI=1.31-10.08, p=0.01). Weak association was also found between the same genotype and increased risk of CIHM of p16 (OR=2.45, 95% CI=0.90-6.68, p=0.08) and CDH1 (OR=2.23, 95% CI=0.94-5.32, p=0.07). 6-CATT repeat carrier (5/6+6/6+6/7) was significantly associated with reduced risk of CIHM of p16 (OR=0.31, 95% CI=0.11-0.90, p=0.03), CDH1 (OR=0.40, 95% CI=0.17-0.98, p=0.045), DAP-kinase (OR=0.37, 95% CI=0.17-0.83, p=0.02) and CIHM high (OR=0.25, 95% CI=0.09-0.74, p=0.01). -7-CATT repeat carrier (6/7+7/7) was weakly associated with reduced risk of CIHM of p16 (OR=0.34, 95% CI=0.10-1.13, p=0.08), DAP-kinase (OR=0.43, 95% CI=0.17-1.06, p=0.07) and CIHM high (OR=0.38, 95%CI=0.12-1.20, p=0.098). The present results provided the first evidence that the genetic polymorphisms MIF polymorphism is associated with CIHM status in the human gastric mucosa. Genetic polymorphisms of MIF-794-CATT repeat may be involved in methylation related carcinogenesis in the stomach.
authors.affiliation: Department of Gastroenterology, Fujita Health University School of Medicine, Toyoake, Aichi 470-1192, Japan. tomomiccyu@yahoo.co.jp
authors.forename: Tomomitsu
authors.initials: T
authors.lastname: Tahara
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Shibata
authors.forename: Masakatsu
authors.initials: M
authors.lastname: Nakamura
authors.forename: Hiromi
authors.initials: H
authors.lastname: Yamashita
authors.forename: Daisuke
authors.initials: D
authors.lastname: Yoshioka
authors.forename: Masaaki
authors.initials: M
authors.lastname: Okubo
authors.forename: Joh
authors.initials: J
authors.lastname: Yonemura
authors.forename: Yoshiteru
authors.initials: Y
authors.lastname: Maeda
authors.forename: Naoko
authors.initials: N
authors.lastname: Maruyama
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Kamano
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Kamiya
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Fujita
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Nakagawa
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Nagasaka
authors.forename: Masami
authors.initials: M
authors.lastname: Iwata
authors.forename: Ichiro
authors.initials: I
authors.lastname: Hirata
authors.forename: Tomiyasu
authors.initials: T
authors.lastname: Arisawa
mesh_terms: D000368:Aged; D018899:CpG Islands / Q000235:genetics*; D019175:DNA Methylation; D005260:Female; D005753:Gastric Mucosa / Q000378:metabolism*; D005838:Genotype; D006801:Humans; D020381:Interleukin-17 / Q000235:genetics*; D019746:Intramolecular Oxidoreductases / Q000235:genetics*; D008263:Macrophage Migration-Inhibitory Factors / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic / Q000235:genetics*
chemical_list: C440021:IL17F protein, human; D020381:Interleukin-17; D008263:Macrophage Migration-Inhibitory Factors; D019746:Intramolecular Oxidoreductases; C515598:MIF protein, human