title: Species and sex differences of aflatoxin B1-induced glutathione S-transferase placental form in single hepatocytes.
abstract: Species and sex differences of aflatoxin B1 (AFB1)-induced glutathione S-transferase placental form (GST-P) positive single hepatocytes have been investigated 48 h after an intraperitoneal injection of AFB1 to young male and female Fischer rats (2 mg AFB1/kg body wt) and male Syrian golden hamsters (6 mg AFB1/kg body wt). The presence of GST-P positive hepatocytes was examined by the immunohistochemical method. Male rats formed three times as many AFB1-induced GST-P positive hepatocytes as females. Pretreatment of both male and female rats with an inhibitor of GSH synthesis, buthionine sulfoximine (BSO) (4 mmol/kg body wt), 2 h and 4 h before AFB1 injection increased AFB1-induced GST-P positive hepatocytes by about 120% above the controls. Male hamsters formed several-fold less AFB1-induced GST-P positive hepatocytes than male rats. Pretreatment with BSO did not increase AFB1-induced GST-P positive hepatocytes in hamsters even though it produced an increase in hepatic necrosis. It appears that GSH and GSH S-transferases play an important role in modulating hepatic AFB1-DNA binding and AFB1-induced GST-P positive hepatocytes in rats and hamsters.
authors.affiliation: Fels Institute for Cancer Research and Molecular Biology, Temple University School of Medicine, Philadelphia, PA 19140.
authors.forename: K
authors.initials: K
authors.lastname: Tsuji
authors.forename: P
authors.initials: P
authors.lastname: Gopalan
authors.forename: K
authors.initials: K
authors.lastname: Lehmann
authors.forename: M
authors.initials: M
authors.lastname: Kimura
authors.forename: A
authors.initials: A
authors.lastname: Horiuchi
authors.forename: K
authors.initials: K
authors.lastname: Sato
authors.forename: P D
authors.initials: PD
authors.lastname: Lotlikar
mesh_terms: D016604:Aflatoxin B1 / Q000494:pharmacology*; D000818:Animals; D002478:Cells, Cultured; D006224:Cricetinae; D004790:Enzyme Induction; D005260:Female; D005982:Glutathione Transferase / Q000096:biosynthesis*; D007527:Isoenzymes / Q000096:biosynthesis*; D008099:Liver / Q000187:drug effects / Q000201:enzymology*; D008297:Male; D008647:Mesocricetus; D010920:Placenta / Q000201:enzymology; D011247:Pregnancy; D051381:Rats; D011916:Rats, Inbred F344; D012727:Sex Characteristics
chemical_list: D007527:Isoenzymes; D016604:Aflatoxin B1; D005982:Glutathione Transferase