Hepatocyte initiation during continuous administration of diethylnitrosamine and 1,2-sym-dimethylhydrazine

Hepatocyte initiation, as indexed by growth-selected gamma-glutamyl transferase-positive foci, was measured during continuous exposure to diethylnitrosamine (DEN) at concentrations used in previous DEN bioassay, DNA adduct, and cell replication studies. Hepatocyte initiation increased in a dose- and...

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Bibliographic Details
Published in:Cancer research (Chicago, Ill.) Ill.), 1988-02, Vol.48 (4), p.988-992
Main Authors: RICHARDSON, F. C, MORGAN, P. H, BOUCHERON, J. A, DEAL, F. H, SWENBERG, J. A
Format: Article
Language:English
Subjects:
1,2-Dimethylhydrazine
Animals
Biological and medical sciences
Carcinogenesis, carcinogens and anticarcinogens
Carcinogens - toxicity
Cell Division - drug effects
Chemical agents
Diethylnitrosamine - toxicity
Dimethylhydrazines - toxicity
gamma-Glutamyltransferase - metabolism
Kinetics
Liver - drug effects
Liver - enzymology
Liver - pathology
Liver Neoplasms, Experimental - pathology
Male
Medical sciences
Methylhydrazines - toxicity
Rats
Rats, Inbred F344
Time Factors
Tumors
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Summary:Hepatocyte initiation, as indexed by growth-selected gamma-glutamyl transferase-positive foci, was measured during continuous exposure to diethylnitrosamine (DEN) at concentrations used in previous DEN bioassay, DNA adduct, and cell replication studies. Hepatocyte initiation increased in a dose- and lobe-specific manner. The efficiency of DEN as an initiating agent was not affected by DEN dose rate over concentrations ranging from 4 to 40 ppm. In a similar experiment the initiating abilities of 1,2-sym-dimethylhydrazine and DEN were compared under continuous exposure regimens. Foci induction increased in a lobe- and time-dependent manner. When left and median lobes were compared, the initiating ability of the two compounds correlated with their carcinogenicity. However, when corresponding anterior lobes were compared, no such correlation was observed.
ISSN:0008-5472
1538-7445