title: Reduced expression of the E-cadherin gene and its aberrant DNA methylation in hamster pancreatic tumors.
abstract: The expression of the E-cadherin gene and its DNA methylation status in the 5' upstream region were investigated in pancreatic duct adenocarcinomas (PDAs) induced by N-nitrosobis(2-oxopropyl)amine (BOP) in hamsters. Female Syrian golden hamsters received 70mg/kg BOP, followed by repeated exposure to an augmentation pressure regimen consisting of a choline-deficient diet combined with dl-ethionine then l-methionine and a further administration of 20mg/kg BOP. A total of 15 PDAs were obtained, along with total RNA for assessment of expression by real-time quantitative reverse transcription-polymerase chain reaction. The expression of the E-cadherin was significantly reduced in PDAs (p<0.05) compared with normal pancreatic tissue. For the analysis of methylation status, bisulfite sequencing was performed with two normal pancreatic tissues and six tumors. The normal pancreatic tissue was all demethylated in this region of E-cadherin. In contrast, six PDAs were highly methylated, correlating with reduced expression of the E-cadherin. These results suggest that aberrant DNA methylation of the E-cadherin gene may play a role in the development of PDAs induced by BOP in hamsters.
authors.affiliation: Laboratory of Cancer Biology and Bioinformatics, Department of Life Science, Faculty of Science and Engineering, Kinki University, 3-4-1, Kowakae, Higashiosaka, Osaka 577-8502, Japan.
authors.forename: Kyoko
authors.initials: K
authors.lastname: Shimizu
authors.forename: Madoka
authors.initials: M
authors.lastname: Hanaoka
authors.forename: Ayumi
authors.initials: A
authors.lastname: Kato
authors.forename: Hiromasa
authors.initials: H
authors.lastname: Fujii
authors.forename: Kanya
authors.initials: K
authors.lastname: Honoki
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Tsujiuchi
mesh_terms: D000230:Adenocarcinoma / Q000139:chemically induced / Q000235:genetics*; D000818:Animals; D001483:Base Sequence; D015820:Cadherins / Q000235:genetics*; D002273:Carcinogens / Q000633:toxicity; D006224:Cricetinae; D019175:DNA Methylation; D004273:DNA, Neoplasm; D005260:Female; D008647:Mesocricetus; D008969:Molecular Sequence Data; D009602:Nitrosamines / Q000633:toxicity; D010190:Pancreatic Neoplasms / Q000139:chemically induced / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D015820:Cadherins; D002273:Carcinogens; D004273:DNA, Neoplasm; D009602:Nitrosamines; C013622:nitrosobis(2-oxopropyl)amine