Application of a Statistical Dynamic Model Investigating the Short-Term Cellular Kinetics Induced by Riddelliine, a Hepatic Endothelial Carcinogen

In recent studies, riddelliine, a pyrrolizidine alkaloid, was found to increase rates of replication and apoptosis and induce hemangiosarcoma in the liver of rats and mice. To analyze DNA replication and apoptosis data taken from the same animals, we have developed a predictive mathematical model fo...

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Bibliographic Details
Published in:Toxicological sciences 2004-08, Vol.80 (2), p.258-267
Main Authors: Smith, Marjo V., Nyska, Abraham, Portier, Chris
Format: Article
Language:English
Subjects:
Algorithms
Animals
Apoptosis - drug effects
Carcinogens - pharmacokinetics
Carcinogens - toxicity
Cell Count
Cell Proliferation - drug effects
Cells - metabolism
cellular kinetics
DNA Replication - drug effects
Endothelium - pathology
hemangiosarcoma
Hemangiosarcoma - chemically induced
Hemangiosarcoma - pathology
Hepatocytes - drug effects
Hepatocytes - pathology
Least-Squares Analysis
Liver Neoplasms - chemically induced
Liver Neoplasms - pathology
Male
mathematical model
Models, Statistical
Pyrrolizidine Alkaloids - pharmacokinetics
Pyrrolizidine Alkaloids - toxicity
Rats
Rats, Inbred F344
riddelliine
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Summary:In recent studies, riddelliine, a pyrrolizidine alkaloid, was found to increase rates of replication and apoptosis and induce hemangiosarcoma in the liver of rats and mice. To analyze DNA replication and apoptosis data taken from the same animals, we have developed a predictive mathematical model for describing BrdU labeling and apoptotic processes. The model allows the incorporation of simple diurnal patterns in cellular kinetics and is applied to data on hepatocytes and endothelial cells taken from riddelliine exposed rats. Predictions from the model were used with multivariable nonlinear regression techniques to estimate replication and apoptotic rate constants for both cell types and all treatment groups. Hypothesis tests were used with the predicted rates to separate the competing effects of riddelliine on replication and apoptosis of hepatocytes and endothelial cells as well as compare replication rates between cell types. That estimated replication rates were found to be significantly higher for endothelial cells supports the supposition of induction of hemangiosarcoma by riddelliine in the liver.
ISSN:1096-6080
1096-0929
1096-0929
DOI:10.1093/toxsci/kfh157