title: Reduced expression of the Tslc1 gene and its aberrant DNA methylation in rat lung tumors.
abstract: TSLC1 gene inactivation due to promoter methylation has been reported in several human cancers. Here, we investigated the expression of the Tslc1 gene and its methylation pattern in lung adenocarcinomas induced by N-nitrosobis(2-hydroxypropyl)amine (BHP). Six-week-old male Wistar rats were given 2000 ppm BHP in their drinking water for 12 weeks and maintained without further treatment until they were sacrificed at 25 weeks. Total RNA was extracted from a total of 11 lung adenocarcinomas and their Tslc1 gene expressions were analyzed by real-time quantitative reverse transcription-polymerase chain reaction. Tslc1 expression was significantly reduced in the lung adenocarcinomas compared with three normal lung tissues (p < 0.05). Bisulfite sequence analysis of four lung adenocarcinomas and two normal lung tissues revealed that the 5' upstream region of the Tslc1 gene was highly methylated in the four lung adenocarcinomas, but unmethylated in the two normal lung tissues. These results suggest that aberrant Tslc1 gene methylation may be involved in BHP-induced development of lung adenocarcinomas in rats.
authors.affiliation: Laboratory of Cancer Biology and Bioinformatics, Department of Life Science, Faculty of Science and Engineering, Kinki University, Higashiosaka, Osaka, Japan.
authors.forename: Kyoko
authors.initials: K
authors.lastname: Shimizu
authors.forename: Yumi
authors.initials: Y
authors.lastname: Itsuzaki
authors.forename: Mariko
authors.initials: M
authors.lastname: Onishi
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: D000818:Animals; D015815:Cell Adhesion Molecules; D015816:Cell Adhesion Molecules, Neuronal / Q000235:genetics* / Q000378:metabolism*; D019175:DNA Methylation; D004252:DNA Mutational Analysis; D004273:DNA, Neoplasm / Q000235:genetics* / Q000378:metabolism*; D015536:Down-Regulation / Q000235:genetics; D015972:Gene Expression Regulation, Neoplastic / Q000235:genetics; D007136:Immunoglobulins; D008175:Lung Neoplasms / Q000235:genetics* / Q000378:metabolism; D009154:Mutation / Q000235:genetics; D051381:Rats; D017208:Rats, Wistar; D025521:Tumor Suppressor Proteins / Q000235:genetics* / Q000378:metabolism*
chemical_list: C465040:Cadm1 protein, rat; D015815:Cell Adhesion Molecules; D015816:Cell Adhesion Molecules, Neuronal; D004273:DNA, Neoplasm; D007136:Immunoglobulins; D025521:Tumor Suppressor Proteins