title: Adverse effects of exposure to low doses of chlorpyrifos in lactating rats.
abstract: This study was conducted to shed light on the effect of exposure of lactating rat to chlorpyrifos (CPF). CPF was orally administered to lactating rats at 0.01 mg kg(-1) b.wt. (acceptable daily intake, ADI), 1.00 mg kg(-1) b.wt. (no observed adverse effects level, NOAEL) and 1.35 mg kg(-1) b.wt. (1/100 LD( 50)) from postnatal day 1 (PN1) until day 20 (PN20) after delivery. Results indicated decreases in body weight and increases in relative liver and kidney weights of exposed dams. Significant damage to liver was observed via increased plasma levels of aminotransferases (aspartate aminotransferase (AST) and alanine aminotransferase (ALT)) lactate dehydrogenase (LDH) and γ-glutamyle transferase (γ-GT) in a dose-dependent manner. At two high doses of CPF (1.00 and 1.35 mg kg(-1) b.wt.), the lactating mothers showed significant decrease in the activity of cholinesterase (ChE). Lipid peroxidation was significantly increased, while glutathione s-transferase (GST) and superoxide dismutase (SOD) were significantly decreased compared to control. At high dose of CPF (1.35 mg kg(-1) b.wt.), total protein and uric acid levels were significantly increased. CPF caused dose-related histopathological changes in liver and kidney of the CPF-treated dams.
authors.affiliation: Environmental Toxicology Research Unit, Pesticide Chemistry Department, National Research Centre, Cairo, Egypt.
authors.forename: Sameeh A
authors.initials: SA
authors.lastname: Mansour
authors.forename: Abdel-Tawab H
authors.initials: AT
authors.lastname: Mossa
mesh_terms: D000284:Administration, Oral; D000818:Animals; D001798:Blood Proteins / Q000032:analysis; D001835:Body Weight / Q000187:drug effects; D004390:Chlorpyrifos / Q000633:toxicity*; D004305:Dose-Response Relationship, Drug; D005260:Female; D005982:Glutathione Transferase / Q000378:metabolism; D007306:Insecticides / Q000633:toxicity*; D007668:Kidney / Q000187:drug effects / Q000473:pathology / Q000503:physiopathology; D007774:Lactation / Q000187:drug effects* / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D008099:Liver / Q000187:drug effects / Q000473:pathology / Q000503:physiopathology; D008111:Liver Function Tests; D008297:Male; D009929:Organ Size / Q000187:drug effects; D051381:Rats; D017208:Rats, Wistar; D013482:Superoxide Dismutase / Q000378:metabolism; D014527:Uric Acid / Q000097:blood
chemical_list: D001798:Blood Proteins; D007306:Insecticides; D014527:Uric Acid; D013482:Superoxide Dismutase; D005982:Glutathione Transferase; D004390:Chlorpyrifos