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Sequential changes in growth kinetics and cellular phenotype during hepatocarcinogenesis
H Zerban1, H M Rabes, P Bannasch
1Institut für experimentelle Pathologie, Deutsches Krebsforschungszentrum, Heidelberg, Federal Republic of Germany.
Journal of Cancer Research and Clinical Oncology
|January 1, 1989
Summary
This study reveals distinct cell proliferation rates in rat liver lesions during N-nitrosomorpholine-induced cancer. Phenotypic differences in preneoplastic foci correlate with their growth potential, guiding tumor development.
Area of Science:
- Hepatocarcinogenesis research
- Cellular biology
- Toxicology
Background:
- Investigating sequential changes in cell proliferation and phenotype during rat hepatocarcinogenesis.
- Utilizing a N-nitrosomorpholine (NNM) induced rat model with a carcinogen withdrawal (stop) model.
Purpose of the Study:
- To determine the [3H]thymidine-labelling index in morphologically defined focal lesions and extrafocal hepatic tissue.
- To analyze cell proliferation rates in preneoplastic and neoplastic hepatic lesions at various time points post-carcinogen withdrawal (4-48 weeks).
Main Methods:
- Autoradiographic determination of [3H]thymidine-labelling index.
- Morphological classification of hepatic lesions (foci, adenomas, carcinomas).
- Comparison of labelling indices between lesion types, extrafocal parenchyma, and control liver tissue.
Main Results:
- Significantly increased labelling index in all preneoplastic and neoplastic hepatic lesions compared to controls and extrafocal parenchyma.
- Differential proliferation rates observed: clear/acidophilic foci showed a smaller increase, while mixed/basophilic foci exhibited a stronger elevation.
- Hepatocellular adenomas and carcinomas demonstrated further increased cell proliferation compared to preneoplastic foci.
- Elevated proliferation rates were consistent across time points, suggesting intrinsic growth potential of cellular phenotypes.
- Increased labelling index in extrafocal liver tissue of NNM-treated rats indicated potential involvement of these cells in hepatocarcinogenesis.
Conclusions:
- Cell proliferation rates in preneoplastic foci reflect their intrinsic growth potential and are linked to specific cellular phenotypes.
- The study supports a sequential progression model of hepatocarcinogenesis: clear/acidophilic foci → mixed/basophilic foci → hepatocellular adenomas/carcinomas.
- Extrafocal hepatocytes may also contribute to hepatocarcinogenesis in this stop model.