title: Oxidative and nitrative stress caused by subcutaneous implantation of a foreign body accelerates sarcoma development in Trp53+/- mice.
abstract: Chronic inflammation is a recognized risk factor for human cancer at various sites because of persistent oxidative and nitrative tissue damage. Trp53+/- mice show the predisposition to tumor development, such as sarcomas and lymphomas, compared with Trp53+/+ mice. We investigated the effects of chronic inflammation, especially oxidative and nitrative stress, induced by subcutaneous implantation of a plastic plate (10 x 5 x 1 mm) as a foreign body on tumorigenesis in Trp53+/- and Trp53+/+ mice. The plastic plates were implanted at the age of about 11 weeks. Thirty out of 38 Trp53+/- mice (79%) developed sarcomas around the implant (mean time of tumor appearance was 45.8 +/- 12.0 weeks of age), whereas only one of 10 Trp53+/+ mice with an implant (10%) developed a tumor, at 56 weeks. No sarcomas developed at a sham-operation site. Two of 10 Trp53+/- mice with no implant (20%) also developed three sarcomas spontaneously at 77, 81 and 84 weeks. Increased immunostaining for markers of oxidative and nitrative stress (8-oxo-7,8-dihydro-2'-deoxyguanosine, 8-nitroguanine and 3-nitrotyrosine) and expression of inducible nitric oxide synthase in tumor cells and inflammatory cells were detected in implant-induced sarcomas compared with spontaneous sarcomas in Trp53+/- mice. Furthermore, p53 loss of heterozygosity was observed in 26 out of 29 implant-induced sarcomas (90%). These results indicate that implanted foreign bodies significantly enhanced sarcoma development in Trp53+/- mice, and this may be associated with increased oxidaive and nitrative stress. Loss of the remaining wild-type p53 allele and loss of p53 function appears to be, at least in part, underlying molecular mechanisms during the development of sarcomas at the implantation site in Trp53+/- mice. Such implant-induced sarcoma development in Trp53+/- mice could be useful for studying molecular mechanisms and developing new strategies for chemoprevention in human carcinogenesis induced by chronic inflammation and/or foreign bodies.
authors.affiliation: International Agency for Research on Cancer, 150 Cours Albert Thomas 69008 Lyon, France. dtazawa@gan2.res.ncc.go.jp
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tazawa
authors.forename: Masayuki
authors.initials: M
authors.lastname: Tatemichi
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Sawa
authors.forename: Isabelle
authors.initials: I
authors.lastname: Gilibert
authors.forename: Ning
authors.initials: N
authors.lastname: Ma
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Hiraku
authors.forename: Lawrence A
authors.initials: LA
authors.lastname: Donehower
authors.forename: Hiroko
authors.initials: H
authors.lastname: Ohgaki
authors.forename: Shosuke
authors.initials: S
authors.lastname: Kawanishi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ohshima
mesh_terms: D000818:Animals; D005547:Foreign Bodies / Q000378:metabolism*; D006147:Guanine / Q000031:analogs & derivatives* / Q000378:metabolism; D006801:Humans; D007249:Inflammation / Q000150:complications / Q000378:metabolism; D019656:Loss of Heterozygosity; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D052247:Nitric Oxide Synthase Type II / Q000378:metabolism*; D010084:Oxidation-Reduction; D018384:Oxidative Stress; D012513:Sarcoma, Experimental / Q000209:etiology* / Q000378:metabolism / Q000473:pathology; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000502:physiology*
chemical_list: C095838:8-nitroguanine; D016159:Tumor Suppressor Protein p53; D006147:Guanine; D052247:Nitric Oxide Synthase Type II