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MGMT-B Gene Promoter Hypermethylation in Patients with Inflammatory Bowel Disease - A Novel Finding

  • Mokarram, Pooneh (Department of Biochemistry, Gastroenterohepatology Research Center, Nemazee Hospital, Colorectal Research Center) ;
  • Kavousipour, Soudabeh (Department of Biochemistry, Gastroenterohepatology Research Center, Nemazee Hospital, Colorectal Research Center) ;
  • Sarabi, Mostafa Moradi (Department of Biochemistry, Gastroenterohepatology Research Center, Nemazee Hospital, Colorectal Research Center) ;
  • Mehrabani, Golnosh (Department of Biochemistry, Gastroenterohepatology Research Center, Nemazee Hospital, Colorectal Research Center) ;
  • Fahmidehkar, Mohammad Ali (Department of Biochemistry, Gastroenterohepatology Research Center, Nemazee Hospital, Colorectal Research Center) ;
  • Shamsdin, Seyedeh Azra (Department of Biochemistry, Gastroenterohepatology Research Center, Nemazee Hospital, Colorectal Research Center) ;
  • Alipour, Abbas (Social Medicine Department, Medical Faculty, Mazandaran University of Medical Sciences) ;
  • Naini, Mahvash Alizade (Department of Internal Medicine, School of Medicine, Shiraz University of Medical Sciences)
  • Published : 2015.03.18

Abstract

Inflammatory bowel disease (IBD) is a disease strongly associated with colorectal cancer (CRC) as a well-known precancerous condition. Alterations in DNA methylation and mutation in K-ras are believed to play an early etiopathogenic role in CRC and may also an initiating event through deregulation of molecular signaling. Epigenetic silencing of APC and SFRP2 in the WNT signaling pathway may also be involved in IBD-CRC. The role of aberrant DNA methylation in precancerous state of colorectal cancer (CRC) is under intensive investigation worldwide. The aim of this study was to investigate the status of promoter methylation of MGMT-B, APC1A and SFRP2 genes, in inflamed and normal colon tissues of patients with IBD compared with control normal tissues. A total of 52 IBD tissues as well as corresponding normal tissues and 30 samples from healthy participants were obtained. We determined promoter methylation status of MGMT-B, SFRP2 and APC1A genes by chemical treatment with sodium bisulfite and subsequent MSP. The most frequently methylated locus was MGMT-B (71%; 34 of 48), followed by SFRP2 (66.6 %; 32 of 48), and APC1A (43.7%; 21 of 48). Our study demonstrated for the first time that hypermethylation of the MGMT-B and the SFRP2 gene promoter regions might be involved in IBD development. Methylation of MGMT-B and SFRP2 in IBD patients may provide a method for early detection of IBD-associated neoplasia.

Keywords

Inflammatory bowel disease;colorectal cancer;gene methylation

Acknowledgement

Supported by : Shiraz University of Medical Sciences

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