| Bayesian estimation of pharmacokinetic and pharmacodynamic parameters in a mode-of-action-based cancer risk assessment for chloroform. | |
| | |
MedLine Citation:
|
PMID: 18093051 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Chloroform is a carcinogen in rodents and its carcinogenicity is secondary to events associated with cytotoxicity and regenerative cell proliferation. In this study, a physiologically based pharmacokinetic/pharmacodynamic (PBPK/PD) model that links the processes of chloroform metabolism, reparable cell damage, cell death, and regenerative cellular proliferation was developed to support a new cancer dose-response assessment for chloroform. Model parameters were estimated using Markov Chain Monte Carlo (MCMC) analysis in a two-step approach: (1) metabolism parameters for male and female mice and rats were estimated against available closed chamber gas uptake data; and (2) PD parameters for each of the four rodent groups were estimated from hepatic and renal labeling index data following inhalation exposures. Subsequently, the resulting rodent PD parameters together with literature values for human age-dependent physiological and metabolism parameters were used to scale up the rodent model to a human model. The human model was used to predict exposure conditions under which chloroform-mediated cytolethality is expected to occur in liver and kidney of adults and children. Using the human model, inhalation Reference Concentrations (RfCs) and oral Reference Doses (RfDs) were derived using an uncertainty factor of 10. Based on liver and kidney dose metrics, the respective RfCs were 0.9 and 0.09 ppm; and the respective RfDs were 0.4 and 3 mg/kg/day. |
| | |
Authors:
|
Kai H Liao; Yu-Mei Tan; Rory B Conolly; Susan J Borghoff; Michael L Gargas; Melvin E Andersen; Harvey J Clewell |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Risk analysis : an official publication of the Society for Risk Analysis Volume: 27 ISSN: 0272-4332 ISO Abbreviation: Risk Anal. Publication Date: 2007 Dec |
Date Detail:
|
Created Date: 2007-12-20 Completed Date: 2008-02-27 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 8109978 Medline TA: Risk Anal Country: United States |
Other Details:
|
Languages: eng Pagination: 1535-51 Citation Subset: IM |
Affiliation:
|
Center for Human Health Assessment, The Hamner Institutes for Health Sciences, Research Triangle Park, NC 27709, USA. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Bayes Theorem Biological Transport, Active Carcinogens / pharmacokinetics, pharmacology, toxicity* Chloroform / pharmacokinetics*, pharmacology, toxicity* Environmental Exposure Female Humans Kidney / metabolism Liver / metabolism Male Markov Chains Mice Models, Biological Monte Carlo Method Neoplasms / chemically induced Neoplasms, Experimental / chemically induced*, metabolism Rats Rats, Inbred F344 Risk Assessment |
| Chemical | |
Reg. No./Substance:
|
0/Carcinogens; 67-66-3/Chloroform |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: CSP deposition to the alveolar region of the lung: implications of cigarette design.
Next Document: Intervening effects of knowledge, morality, trust, and benefits on support for animal and plant biot...