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[Thymidine kinase activities in sera and liver tissues during hepatocarcinogenesis in rats treated with 3'-methyl-4-dimethylaminoazobenzene (3'-MeDAB)].
- Source :
-
Nihon Gan Chiryo Gakkai shi [Nihon Gan Chiryo Gakkai Shi] 1990 Dec 20; Vol. 25 (12), pp. 2794-801. - Publication Year :
- 1990
-
Abstract
- It is known that a high incidence of hepatocellular carcinoma in rat liver can be induced with 3'-methyl-4-dimethylaminoazobenzene (3'-MeDAB). In the present study, we investigated serum levels of alpha-fetoprotein (AFP) and thymidine kinase (TK), DNA-synthesizing enzyme in the salvage pathway, and tissue TK and its isozyme activities in the liver of rats treated with 3'-MeDAB. Serum TK activities rose abruptly right after the onset of 3'-MeDAB treatment, peaking after one week and then gradually decreasing. At 3 weeks, though serum TK was decreasing, serum AFP and tissue TK began to increase, and oval cells appeared in the liver. At 5 weeks, though serum TK reached a nadir, serum AFP and tissue TK formed transient peaks, and oval cells occupied a major part of the hepatic lobules with hyperplastic nodules. Thereafter, serum TK continued to increase, and serum AFP and tissue TK, after transiently decreasing, re-increased; at 20 weeks, each value was at high level, and mixed type hepatocarcinoma was observed. The liver TK isozymes were separated into 3 types by DEAE-cellulose column chromatography. A 3'-MeDAB induced a remarkable increase in activity of cytosolic and fetal type isozyme in non-tumorous regions of livers at 5 weeks and tumorous regions at 20 weeks. These results indicate that biochemical changes in 3'-MeDAB-treated rat liver may provide a valuable insight into two step process in hepatocarcinogenesis.
Details
- Language :
- Japanese
- ISSN :
- 0021-4671
- Volume :
- 25
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- Nihon Gan Chiryo Gakkai shi
- Publication Type :
- Academic Journal
- Accession number :
- 2074389