title: Translactational induction of CYP4A expression in 10.5-day neonatal rats by the hypolipidemic drug clofibrate.
abstract: Lactating mothers of 7.5-day neonatal rats were injected intraperitoneally with 500 mg kg-1 clofibrate for 3 consecutive days at 24-hour intervals; 24 hours after the final injection, the maternal cytochrome P450 4A (CYP4A) mRNA levels had risen 14- and 2.5-fold above the constitutive levels of expression seen in the liver and kidney, respectively. Lactational transfer of clofibrate to the suckling 10.5-day litter was demonstrated by the 15- and 5-fold elevation observed in the neonatal hepatic and renal CYP4A mRNAs, respectively, following suckling from drug-induced mothers. A significant decrease in the relative liver weights of these neonatal pups was seen following clofibrate exposure via maternal milk, in total contrast to the normally observed increase in liver/body weight ratios of rats treated with clofibrate. Western blot analysis using a polyclonal goat anti-rat CYP4A1 antibody also demonstrated a rise in the CYP4A protein levels in both the mothers and their litters following maternal clofibrate treatment.
authors.affiliation: Biology Research, Knoll Pharmaceuticals, Nottingham, U.K.
authors.forename: A E
authors.initials: AE
authors.lastname: Simpson
authors.forename: W J
authors.initials: WJ
authors.lastname: Brammar
authors.forename: M K
authors.initials: MK
authors.lastname: Pratten
authors.forename: C R
authors.initials: CR
authors.lastname: Elcombe
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D000833:Animals, Suckling; D001483:Base Sequence; D015152:Blotting, Northern; D015153:Blotting, Western; D001835:Body Weight / Q000187:drug effects; D002994:Clofibrate / Q000494:pharmacology*; D042926:Cytochrome P-450 CYP4A; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis* / Q000235:genetics; D004790:Enzyme Induction; D005260:Female; D000960:Hypolipidemic Agents / Q000494:pharmacology*; D007668:Kidney / Q000187:drug effects / Q000201:enzymology; D007774:Lactation; D008099:Liver / Q000187:drug effects / Q000201:enzymology*; D006899:Mixed Function Oxygenases / Q000096:biosynthesis* / Q000235:genetics; D008969:Molecular Sequence Data; D009929:Organ Size / Q000187:drug effects; D012333:RNA, Messenger / Q000096:biosynthesis*; D051381:Rats; D017208:Rats, Wistar
chemical_list: D000960:Hypolipidemic Agents; D012333:RNA, Messenger; D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D042926:Cytochrome P-450 CYP4A; D002994:Clofibrate