title: Increased susceptibility of poly(ADP-ribose) polymerase-1 knockout mice to nitrosamine carcinogenicity.
abstract: The involvement of poly(ADP-ribose) polymerase-1 (Parp-1), one of the poly(ADP-ribose) polymerase family proteins, in genomic stability, DNA repair and cell death triggered by DNA damage has been well documented. However, the potential role of Parp-1 in carcinogenesis has not been well evaluated. In this study the carcinogenic activity of N:-nitrosobis(2-hydroxypropyl)amine (BHP) was studied in Parp-1(-/-) mice, generated by disrupting P:arp-1 gene exon 1. Parp-1(-/-) and Parp-1(+/+) male mice received 0, 250 and 500 p.p.m. BHP in their drinking water for 20 weeks and were then killed. The percentage of animals bearing hemangiomas and hemangiosarcomas in the liver and numbers of tumors per mouse were markedly higher in the Parp-1(-/-) groups given 250 or 500 p.p.m. BHP than in their Parp-1(+/+) counterparts. Hemangiosarcomas developed only in Parp-1(-/-) mice. In the lung the numbers of adenomas per mouse were increased in Parp-1(-/-) mice given BHP at 250 and 500 p.p.m. (P < 0.01) compared with the Parp-1(+/+) case. The results show that susceptibility to BHP is significantly elevated in Parp-1(-/-) mice, thus providing direct evidence that Parp-1 is relevant to carcinogenesis.
authors.affiliation: Department of Oncological Pathology, Cancer Center, Nara Medical University, 840, Shijo-cho, Kashihara, Nara 634-8521, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Tsutsumi
authors.forename: M
authors.initials: M
authors.lastname: Masutani
authors.forename: T
authors.initials: T
authors.lastname: Nozaki
authors.forename: O
authors.initials: O
authors.lastname: Kusuoka
authors.forename: T
authors.initials: T
authors.lastname: Tsujiuchi
authors.forename: H
authors.initials: H
authors.lastname: Nakagama
authors.forename: H
authors.initials: H
authors.lastname: Suzuki
authors.forename: Y
authors.initials: Y
authors.lastname: Konishi
authors.forename: T
authors.initials: T
authors.lastname: Sugimura
mesh_terms: D000230:Adenocarcinoma / Q000139:chemically induced / Q000201:enzymology; D000236:Adenoma / Q000139:chemically induced / Q000201:enzymology; D000818:Animals; D015197:Carcinogenicity Tests; D002273:Carcinogens / Q000633:toxicity*; D004198:Disease Susceptibility / Q000201:enzymology; D006391:Hemangioma / Q000139:chemically induced / Q000201:enzymology; D006394:Hemangiosarcoma / Q000139:chemically induced / Q000201:enzymology; D008114:Liver Neoplasms, Experimental / Q000139:chemically induced / Q000201:enzymology*; D008175:Lung Neoplasms / Q000139:chemically induced / Q000201:enzymology*; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D018345:Mice, Knockout; D009602:Nitrosamines / Q000633:toxicity*; D011065:Poly(ADP-ribose) Polymerases / Q000235:genetics / Q000378:metabolism*
chemical_list: D002273:Carcinogens; D009602:Nitrosamines; C012457:diisopropanolnitrosamine; D011065:Poly(ADP-ribose) Polymerases