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Peroxisome proliferators: paradigms and prospects
1School of Biological Sciences, University of Surrey, Guildford, UK.
Toxicology Letters
|May 1, 1993
Summary
Peroxisome proliferators, diverse chemicals, induce liver enlargement and cell cycle changes. These compounds are non-genotoxic carcinogens, posing risks through mechanisms like oxidative stress and clonal expansion.
Area of Science:
- Toxicology
- Hepatology
- Carcinogenesis
Background:
- Peroxisome proliferators encompass diverse chemicals like fibrates, phthalates, and herbicides.
- These compounds trigger common pleiotropic responses in the liver.
Purpose of the Study:
- To review the pleiotropic hepatic responses induced by peroxisome proliferators.
- To discuss the role of Peroxisome Proliferator Activated Receptor (PPAR).
- To explore mechanisms of non-genotoxic carcinogenesis and human risk assessment.
Main Methods:
- Review of literature on peroxisome proliferator effects.
- Analysis of molecular mechanisms including cytochrome P4504A1 induction and growth factor stimulation.
- Discussion of genotoxicity assays and carcinogenesis models.
Main Results:
- Peroxisome proliferators cause hepatomegaly, cell cycle alterations, and oncogene activation.
- PPAR plays a role in mediating these hepatic responses.
- These agents are non-genotoxic but complete carcinogens, particularly in rodents.
Conclusions:
- Peroxisome proliferators induce significant hepatic changes and are linked to carcinogenesis through non-genotoxic pathways.
- Mechanisms include oxidative stress and clonal expansion of initiated cells.
- Risk assessment for human exposure requires careful consideration of these findings.