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Comparison of different initiation protocols in the resistant hepatocyte model
Parvaneh Espandiari1, Larry W Robertson, Cidambi Srinivasan
1Graduate Center for Toxicology, University of Kentucky, Lexington, KY 40506, USA.
Toxicology
|December 14, 2004
Summary
Male neonatal rats effectively replace partial hepatectomy in the Solt-Farber rat liver cancer model. Fasting and refeeding also enhanced tumor development, particularly at higher carcinogen doses.
Area of Science:
- Hepatology
- Carcinogenesis Research
- Animal Models
Background:
- The Solt-Farber resistant hepatocyte model is crucial for studying multistage liver carcinogenesis in rats.
- This model typically uses partial hepatectomy (PH) to induce liver regeneration for carcinogen initiation.
Purpose of the Study:
- To evaluate alternative methods to partial hepatectomy (PH) for inducing liver regeneration in the Solt-Farber model.
- To investigate the efficacy of fasting/refeeding and neonatal exposure as replacements for PH.
Main Methods:
- Rats were initiated with diethylnitrosamine (DEN) and subjected to PH, fasting/refeeding, or neonatal exposure.
- A selection phase involved 2-acetylaminofluorene (AAF) and carbon tetrachloride treatment.
- Gamma-glutamyl transpeptidase (GGT)-positive foci were quantified to assess carcinogenesis.
Main Results:
- Partial hepatectomy and male neonatal exposure significantly increased GGT-positive foci compared to controls.
- Fasting/refeeding increased foci only at a higher DEN dose (100 mg/kg).
- Neonatal female exposure did not significantly increase foci compared to controls.
Conclusions:
- Male neonatal rats serve as a viable alternative to partial hepatectomy in the Solt-Farber protocol.
- Fasting/refeeding can promote liver carcinogenesis but is dose-dependent.
- These findings offer refined methods for liver cancer research models.