title: Developmental toxicity study of chlorpyrifos in rats.
abstract: Chlorpyrifos (O,O-diethyl-O-(3,5,6-trichloro-2-pyridyl)-phosphorothioate) was evaluated for potential developmental toxicity. Groups of 30 bred female Fischer 344 rats were given 0, 5, 15, and 25mg/kg per day by gavage on gestation days 6-15; the fetuses were evaluated on gestation day 21. Clinical signs of toxicity attributed to chlorpyrifos were noted in dams receiving 15 and 25mg/kg per day. Maternal effects in these groups also included depressed body weight and acetylcholinesterase activity. Fetal weight and viability were decreased, and fetal death and early resorption were increased at the 25mg/kg per day maternal dose. Visceral, skeletal, and external variations were also increased in this group. Chlorpyrifos showed fetotoxic and teratogenic effects at a maternal dose of 25mg/kg per day, a dose that also produced maternal toxicity.
authors.affiliation: Department of Pesticide Chemistry and Toxicology, Faculty of Agriculture, Alexandria University, Aflaton Street, El Shatby, Alexandria, Egypt. aminafarag2002@yahoo.com
authors.forename: Amina T
authors.initials: AT
authors.lastname: Farag
authors.forename: Ahmed M
authors.initials: AM
authors.lastname: El Okazy
authors.forename: Ahmed F
authors.initials: AF
authors.lastname: El-Aswed
mesh_terms: D000014:Abnormalities, Drug-Induced / Q000473:pathology; D000110:Acetylcholinesterase / Q000378:metabolism; D000818:Animals; D001835:Body Weight / Q000187:drug effects; D001921:Brain / Q000187:drug effects; D004390:Chlorpyrifos / Q000633:toxicity*; D004435:Eating / Q000187:drug effects; D005314:Embryonic and Fetal Development / Q000187:drug effects; D005260:Female; D007306:Insecticides / Q000633:toxicity*; D008099:Liver / Q000187:drug effects; D008297:Male; D009929:Organ Size / Q000187:drug effects; D011247:Pregnancy; D051381:Rats; D011916:Rats, Inbred F344; D013723:Teratogens
chemical_list: D007306:Insecticides; D013723:Teratogens; D000110:Acetylcholinesterase; D004390:Chlorpyrifos