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Carcinogenesis, Vol. 22, No. 1, 1-3, January 2001
© 2001 Oxford University Press

ACCELERATED PAPER

Increased susceptibility of poly(ADP-ribose) polymerase-1 knockout mice to nitrosamine carcinogenicity

Masahiro Tsutsumi, Mitsuko Masutani1,,3, Tadashige Nozaki1, Osamu Kusuoka, Toshifumi Tsujiuchi, Hitoshi Nakagama1, Hiroshi Suzuki2, Yoichi Konishi and Takashi Sugimura1

Department of Oncological Pathology, Cancer Center, Nara Medical University, 840, Shijo-cho, Kashihara, Nara 634-8521,
1 Biochemistry Division, National Cancer Center Research Institute, 1-1 Tsukiji 5-chome, Chuo-ku, Tokyo 104-0045 and
2 Chugai Pharmaceutical Co. Ltd, 1-135 Komakado, Gotemba, Shizuoka 412-0038, Japan

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 Parp-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.


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