title: Evaluation of developmental toxicity of ultraviolet absorber 2-(3',5'-di-tert-butyl-2'-hydroxyphenyl)-5-chlorobenzotriazole in rats.
abstract: 2-(3',5'-Di-tert-butyl-2'-hydroxyphenyl)-5-chlorobenzotriazole (DBHCB) is widely used as a UV absorber. In this study, the developmental toxicity of DBHCB was evaluated in rats. Pregnant rats were given DBHCB at 0, 62.5, 250, or 1000 mg kg(-1) day(-1) by gavage on days 5-19 of pregnancy. No deaths were observed in the pregnant rats of any group. No effect of DBHCB on the general conditions, body weight gain, or feed consumption was observed in the pregnant rats. There were no changes in the ovarian weight, gravid uterine weight, or necropsy findings in the maternal rats of the DBHCB-treated groups. No significant effects of DBHCB were found in the number of corpora lutea, implantations, live fetuses, resorptions or dead fetuses, incidence of pre- or postimplantation embryonic loss, viability of fetuses, fetal weight, or sex ratio of live fetuses. No significant difference in the incidence of fetuses with malformations or variations or degree of ossification was detected between the DBHCB-treated and control groups.
authors.affiliation: Division of Risk Assessment, Biological Safety Research Center, National Institute of Health Sciences, Tokyo, Japan. ema@nihs.go.jp
authors.forename: Makoto
authors.initials: M
authors.lastname: Ema
authors.forename: Katsuhiro
authors.initials: K
authors.lastname: Fukunishi
authors.forename: Mariko
authors.initials: M
authors.lastname: Matsumoto
authors.forename: Akihiko
authors.initials: A
authors.lastname: Hirose
authors.forename: Eiichi
authors.initials: E
authors.lastname: Kamata
mesh_terms: D000014:Abnormalities, Drug-Induced / Q000473:pathology*; D000284:Administration, Oral; D000818:Animals; D004305:Dose-Response Relationship, Drug; D004785:Environmental Pollutants / Q000633:toxicity*; D005260:Female; D047109:Fetal Development / Q000187:drug effects*; D008098:Litter Size / Q000187:drug effects; D018811:Maternal Exposure; D019055:No-Observed-Adverse-Effect Level; D011247:Pregnancy; D051381:Rats; D017207:Rats, Sprague-Dawley; D013473:Sunscreening Agents / Q000633:toxicity*; D014230:Triazoles / Q000633:toxicity*
chemical_list: C511878:2-(3',5'-di-tert-butyl-2'-hydroxyphenyl)-5-chlorobenzotriazole; D004785:Environmental Pollutants; D013473:Sunscreening Agents; D014230:Triazoles