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© 1992 Oxford University Press

research-article

Modification of DENA-induced hepatocarcinogenesis by CCI4 cirrhosis. Comparison of the marker enzyme patterns

I. Kovalszky, Sz. Szeberenyi 1, A. Zalatnai, I. Vincze 2, K. Lapis and A. Jeney

Semmelweis Medical University, 1st Institute of Pathology and Experimental Cancer Research
1National Institute of Occupational Health
2National Institute of Hygiene Budapest, Hungary

The modifying action of chronic liver injury on the process of hepatocarcinogenesis was investigated. To induce cirrhosis or fibrosis F344 rats received CCI4 alone or in combination with phenobarbital, either before (model 1) or after (model 2) the application of initiator, diethylnitrosamine (DENA). In these models, morphology, tumor incidence as well as polysubstrate monooxygenase system, {gamma}-glutamyltransferase (GGT) and glucose-6-phosphatase (G-6-Pase) were studied. The data presented show that in model 1 the tumor incidence was much lower than in rats treated with DENA alone. This reduction appeared to be associated with the decrease in cytochrome P450 content occurring in model 1 after DENA administration. Promotion of the hepatocarcinogenk process was observed when CCI4 injury followed the application of DENA (model 2). Comparison of marker enzymes in cirrhotic livers and in tumors either with or without cirrhosis indicated that changes in cytochrome P450 and G-6-Pase were rather the results of parenchymal damage, while GGT was elevated only in tumorous livers. In tumorous livers none of the xenobiotic metabolizing activities decreased as much as the cytochrome P450 content of the same samples. Thus conceivably the cytochrome P450 operates more rapidly in tumors than in normal livers.


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