title: Immature rat uterotrophic assay of 18 chemicals and Hershberger assay of 30 chemicals.
abstract: We performed an immature rat uterotrophic assay of 18 chemicals and Hershberger assay of 30 chemicals to assess the relationship between the results of two assays. The chemicals tested by the uterotopic assay were 4-n-amylphenol, p-dodecyl-phenol, p-(tert-pentyl)phenol, 4-cyclohexylphenol, 4-(1-adamantyl)phenol, 4,4'-thiobis-phenol, diphenyl-p-phenylenediamine, 4-hydroxyazobenzene, 4-(phenylmethyl)phenol, 4,4'-(hexafluoroisopropylidene)diphenol, 2,2-bis(4-hydroxyphenyl)-4-methyl-n-pentane, 4,4'-(octahydro-4,7-methano-5H-inden-5-ylidene)bisphenol, 4,4'-dihydroxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 4-hydroxybenzophenone, 2,4,4'-trihydroxybenzophenone, testosterone enanthate, and methyltestosterone. The chemicals tested by the Hershberger assay were the 18 chemicals tested in the uterotrophic assay plus the following: 17 alpha estradiol, estrone, equilin, norethindrone, norgestrel, ethynyl estradiol, bisphenol A, bisphenol B, bisphenol F, 4-tert-octylphenol, p-cumyl phenol, and nonylphenol. All chemicals examined in this study were positive in a reporter gene assay for ER-alpha. In the immature rat uterotrophic assay, all chemicals induced uterotrophy and p-(tert-pentyl)phenol, 4,4'-thiobis-phenol, 4-(phenylmethyl)phenol, 4,4'-(hexafluoroisopropylidene)diphenol, 2,2-bis(4-hydroxyphenyl)-4-methyl-n-pentane, 4,4'-(octahydro-4,7-methano-5H-inden-5-ylidene)bisphenol, 4,4'-dihydroxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 4-hydroxybenzophenone, and 2,4,4'-trihydroxybenzophenone exerted both estrogen agonistic effect and reduced the estrogenic effect of ethynylestradiol. In the Hershberger assay, a clear androgen agonistic effect was detected in the androgen derivatives testosterone enanthate and methyltestosterone.
authors.affiliation: Chemicals Evaluation and Research Institute, 3-822, Ishii, Hita, Oita 877-0061, Japan. yamasaki-kanji@ceri.jp
authors.forename: Kanji
authors.initials: K
authors.lastname: Yamasaki
authors.forename: Masahiro
authors.initials: M
authors.lastname: Takeyoshi
authors.forename: Masakuni
authors.initials: M
authors.lastname: Sawaki
authors.forename: Nobuya
authors.initials: N
authors.lastname: Imatanaka
authors.forename: Kazutoshi
authors.initials: K
authors.lastname: Shinoda
authors.forename: Mineo
authors.initials: M
authors.lastname: Takatsuki
mesh_terms: D000726:Androgen Antagonists / Q000633:toxicity*; D000728:Androgens / Q000819:agonists / Q000378:metabolism / Q000633:toxicity*; D000818:Animals; D001681:Biological Assay / Q000379:methods; D001835:Body Weight / Q000187:drug effects; D004965:Estrogen Antagonists / Q000633:toxicity*; D004967:Estrogens / Q000819:agonists / Q000378:metabolism / Q000633:toxicity*; D005260:Female; D005837:Genitalia, Male / Q000187:drug effects*; D008297:Male; D009919:Orchiectomy; D009929:Organ Size / Q000187:drug effects; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D017208:Rats, Wistar; D014599:Uterus / Q000187:drug effects*
chemical_list: D000726:Androgen Antagonists; D000728:Androgens; D004965:Estrogen Antagonists; D004967:Estrogens