title: Enhancement of lung carcinogenesis by nonylphenol and genistein in a F344 rat multiorgan carcinogenesis model.
abstract: The modifying effects of nonylphenol and genistein on cancer induction were assessed in a multi-organ carcinogenesis model in male F344 rats initially treated with five different carcinogens. In experiment 1 rats received 250 or 25 ppm nonylphenol, or 250 or 25 ppm genistein in their diet for 28 weeks. The total incidences of adenomas and carcinomas in the lungs of animals treated with nonylphenol and genistein were significantly higher than in the control group. 5-Bromo-2'-deoxyuridine labeling indices, reflecting cell proliferation, were also significantly elevated in the lungs of rats given 250 and 25 ppm nonylphenol and 250 ppm genistein. In experiment 2, rats were treated with nonylphenol or genistein at concentrations of 250 ppm after DHPN initiation. In the lung, formation of 8-hydroxy-2'-deoxyguanosine, a marker of oxygen radical-mediated DNA damage, was significantly increased. These results indicate that nonylphenol and genistein have the potential to promote rat lung carcinogenesis, possibly via a mechanism involving stimulation of cell proliferation and DNA damage caused by oxygen radicals.
authors.affiliation: Department of Pathology, Osaka City University Medical School, 1-4-3, Asahi-machi, Abeno-ku, Osaka, 545-8585, Japan.
authors.forename: Noritaka
authors.initials: N
authors.lastname: Seike
authors.forename: Hideki
authors.initials: H
authors.lastname: Wanibuchi
authors.forename: Keiichirou
authors.initials: K
authors.lastname: Morimura
authors.forename: Min
authors.initials: M
authors.lastname: Wei
authors.forename: Takayuki
authors.initials: T
authors.lastname: Nishikawa
authors.forename: Kazuto
authors.initials: K
authors.lastname: Hirata
authors.forename: Junichi
authors.initials: J
authors.lastname: Yoshikawa
authors.forename: Shoji
authors.initials: S
authors.lastname: Fukushima
mesh_terms: D000818:Animals; D001835:Body Weight; D002455:Cell Division / Q000187:drug effects; D004247:DNA / Q000096:biosynthesis; D004195:Disease Models, Animal; D004327:Drinking Behavior; D005247:Feeding Behavior; D019833:Genistein / Q000009:adverse effects*; D007150:Immunohistochemistry; D015994:Incidence; D008175:Lung Neoplasms / Q000139:chemically induced* / Q000473:pathology*; D008297:Male; D009929:Organ Size; D009928:Organ Specificity; D010636:Phenols / Q000009:adverse effects*; D018809:Proliferating Cell Nuclear Antigen / Q000032:analysis; D051381:Rats; D011916:Rats, Inbred F344; D015996:Survival Rate
chemical_list: D010636:Phenols; D018809:Proliferating Cell Nuclear Antigen; C025256:nonylphenol; D004247:DNA; D019833:Genistein