title: Effects of a choline-deficient diet and a hypolipidemic agent on single glutathione S-transferase placental form-positive hepatocytes in rat liver.
abstract: Using the placental form of glutathione S-transferase (GST-P) as a marker of carcinogen-initiated hepatocytes, we investigated how a choline-deficient (CD) diet and BR931, a carcinogenic hypolipidemic agent, modify populations of single GST-P-positive hepatocytes. The liver of male Fischer rats (6-7 weeks old) fed a CS or basal diet contained mostly single or double GST-P-positive hepatocytes. Feeding a CD diet for 2-4 weeks led to increases in the number of aggregates of two and three GST-P-positive hepatocytes. By 8-12 weeks, there was an emergence of discrete foci of GST-P-positive hepatocytes consisting of more than 20 hepatocytes. Feeding a BR931 diet for 4-8 weeks resulted in no significant change in the number of single GST-P-positive hepatocytes in the liver as compared to feeding a basal diet. It is suggested that single GST-P-positive hepatocytes in the liver of relatively young rats maintained on a commercial diet may represent endogenously initiated cells. A CD diet promotes endogenously initiated cells to form larger aggregates or foci of GST-P-positive cells.
authors.affiliation: Department of Pathology, University of Pittsburgh School of Medicine, PA 15261.
authors.forename: K
authors.initials: K
authors.lastname: Yokota
authors.forename: U
authors.initials: U
authors.lastname: Singh
authors.forename: H
authors.initials: H
authors.lastname: Shinozuka
mesh_terms: D000818:Animals; D002796:Choline Deficiency / Q000201:enzymology*; D005260:Female; D005982:Glutathione Transferase / Q000032:analysis*; D000960:Hypolipidemic Agents / Q000633:toxicity*; D008099:Liver / Q000187:drug effects / Q000201:enzymology*; D008297:Male; D010920:Placenta / Q000201:enzymology*; D011247:Pregnancy; D051381:Rats; D011916:Rats, Inbred F344
chemical_list: D000960:Hypolipidemic Agents; D005982:Glutathione Transferase