title: Mutations of lysophosphatidic acid receptor-1 gene during progression of lung tumors in rats.
abstract: Lysophosphatidic acid (LPA) is a bioactive phospholipid that stimulates cell proliferation, migration, and protects cells from apoptosis. It interacts with specific G protein-coupled transmembrane receptors. In this study, mutations of lysophosphatidic acid receptor-1 (LPA1) gene were investigated to clarify the possible molecular mechanisms underlying the development of lung tumors induced by N-nitrosobis(2-hydroxypropyl)amine (BHP) in rats. Male Wistar rats, 6 weeks of age, were given 2000ppm BHP in their drinking water for 12 weeks and then maintained without further treatment until sacrifice at 25 weeks. Genomic DNAs were extracted from paraffin-embedded tissues and exons 2-4 were examined for mutations, using polymerase chain reaction (PCR)-single strand conformation polymorphism (SSCP) analysis. No LPA1 mutations were detected in 15 hyperplasias, but 2 out of 12 adenomas (16.7%) and 7 out of 17 adenocarcinomas (41.2%). These results suggest that mutations of LPA1 gene may be involved in the acquisition of growth advantage from adenomas to adenocarcinomas in lung carcinogenesis induced in rats by BHP.
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: Takanori
authors.initials: T
authors.lastname: Yamada
authors.forename: Yumi
authors.initials: Y
authors.lastname: Obo
authors.forename: Mami
authors.initials: M
authors.lastname: Furukawa
authors.forename: Mayuko
authors.initials: M
authors.lastname: Hotta
authors.forename: Ayako
authors.initials: A
authors.lastname: Yamasaki
authors.forename: Kanya
authors.initials: K
authors.lastname: Honoki
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Fukushima
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Tsujiuchi
mesh_terms: D000230:Adenocarcinoma / Q000139:chemically induced / Q000235:genetics* / Q000473:pathology; D000236:Adenoma / Q000139:chemically induced / Q000235:genetics* / Q000473:pathology; D000818:Animals; D002273:Carcinogens / Q000633:toxicity; D002471:Cell Transformation, Neoplastic / Q000139:chemically induced / Q000235:genetics*; D004252:DNA Mutational Analysis; D004195:Disease Models, Animal; D008175:Lung Neoplasms / Q000139:chemically induced / Q000235:genetics* / Q000473:pathology; D008297:Male; D009154:Mutation; D009602:Nitrosamines / Q000633:toxicity; D018807:Polymorphism, Single-Stranded Conformational; D051381:Rats; D017208:Rats, Wistar; D049368:Receptors, Lysophosphatidic Acid / Q000235:genetics*
chemical_list: D002273:Carcinogens; D009602:Nitrosamines; D049368:Receptors, Lysophosphatidic Acid; C012457:diisopropanolnitrosamine