Quantitative Comparison of Initiation and Mutation Phenotypes in Hepatocytes of the Analbuminemic Rat
- 1 February 1993
- journal article
- Published by Wiley in Japanese Journal of Cancer Research
- Vol. 84 (2) , 175-183
- https://doi.org/10.1111/j.1349-7006.1993.tb02852.x
Abstract
The potential relationship between mutagenesis and carcinogenesis has been examined in the Nagase analbuminemic rat treated with a single dose of benzo[a]pyrene, an incomplete liver carcinogen. The apparent mutation rate at the albumin locus was calculated by determining the number of hepatocytes expressing a cross‐reactive product of albumin in analbuminemic rats treated with benzo[a]pyrene. The rate of initiation, the first stage in carcinogenesis, was determined by assessing the number of hepatocytes expressing the placental isozyme of glutathione S‐transferase (PGST) after administration of benzo[a]pyrene. Since the expression of PGST may represent hepatocellular changes independent of initiation, promotion with phenobarbital was employed to clonally expand those putatively initiated hepatocytes expressing PGST. With immunohistochemical measures to assess changes in albumin expression, a threefold increase in the number of hepatocytes expressing albumin was detected after administration of benzo[a]pyrene in Nagase analbuminemic rats. A more than five‐fold increase in altered hepatic foci (AHF) exhibiting increased PGST expression was observed in animals given benzo[a]pyrene treatment followed by phenobarbital, compared with those given benzo[a]pyrene alone. The number of albumin‐expressing single hepatocytes detected was of the same order of magnitude as the number of individual hepatocytes and AHF expressing PGST, suggesting that similar events may be involved in their formation. Since 3 × 106 single hepatocytes expressing albumin were found in the analbuminemic rat liver after a single administration of benzo[a]pyrene, while less than 2 × 104 AHF expressing PGST were observed, formation of individual hepatocytes expressing albumin was a far more frequent event than clonal expansion of initiated hepatocytes in the Nagase analbuminemic rat. However, the number of loci of PGST expression including AHF and single hepatocytes is comparable to that of single hepatocytes expressing albumin.Keywords
This publication has 84 references indexed in Scilit:
- Comparison of GST-P Versus GGT as Markers of Hepatocellular Lineage During Analyses of Initiation of CarcinogenesisCancer Investigation, 1988
- Benzo[a]pyrene metabolism and induction of enzymealtered foci in regenerating rat liverChemico-Biological Interactions, 1988
- Evidence for growth heterogeneity among foci with different phenotypes in the population of altered hepatocyte foci induced by a single neonatal treatment with carcinogenCarcinogenesis: Integrative Cancer Research, 1986
- Assay for gene mutation in a human lymphoblast line, AHH-1, competent for xenobiotic metabolismMutation Research - Fundamental and Molecular Mechanisms of Mutagenesis, 1984
- On the nature of the mutations induced by the diolepoxide of benzo[a]pyrene in mammalian cellsCarcinogenesis: Integrative Cancer Research, 1984
- Relationship between excision repair and the cytotoxic and mutagenic effect of the ‘anti’ 7,8-diol-9,10-epoxide of benzo[a]pyrene in human cellsMutation Research - Fundamental and Molecular Mechanisms of Mutagenesis, 1982
- Alteration of plasmid DNA-mediated transformation and mutation induced by covalent binding of benzo[a]pyrene- 7,8-dihydrodiol-9,10-oxide in Escherichia coliMutation Research - Fundamental and Molecular Mechanisms of Mutagenesis, 1981
- Early appearance of histochemically altered hepatocyte foci and liver tumors in female rats treated with carcinogens one day after birthCarcinogenesis: Integrative Cancer Research, 1981
- Benzo[a]pyrene diol epoxide covalently binds to deoxyguanosine and deoxyadenosine in DNANature, 1977
- Probable clonal genesis of cellular islands induced in rat liver by diethylnitrosaminePublished by Elsevier ,1971