Abstract
Peroxisome proliferators are a large and varied group of chemicals that can induce P450s as well as other drug metabolizing enzymes. These chemicals can cause the number of peroxisomes in the livers of some sensitive species to increase with subsequent enlargement of the liver. This may ultimately lead to the development of liver tumors, but peroxisome proliferators or their metabolites do not appear to be mutagens (Rao, Reddy, 1991). Thus, they are considered to be non-genotoxic carcinogens. The increase in peroxisomes may in turn reflect the induction of several peroxisomal enzymes that metabolize fatty acids by β-oxidation. In contrast to mitochondrial β-oxidation, the peroxisomal pathway appears to function as pathway for the elimination of fatty acids and the production of heat rather than conservation of energy through the formation of ATP. In addition, long-chain, branched chain and dicarboxylic fatty acids are preferentially metabolized by the peroxisomal pathway. The latter can arise via the ω-hydroxylation of monocarboxylic acids, a reaction that is catalyzed by microsomal P450s of the CYP4A family and subsequent oxidation of the alcohol to a second carboxyl moiety by other enzymes.
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© 1995 Springer-Verlag Berlin Heidelberg
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Johnson, E.F., Palmer, C.N.A., Hsu, MH., Griffin, K.J. (1995). The Role of Nuclear Receptors in the Regulation of P450s and Other Genes by Peroxisome Proliferators. In: Arinç, E., Schenkman, J.B., Hodgson, E. (eds) Molecular Aspects of Oxidative Drug Metabolizing Enzymes. NATO ASI Series, vol 90. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-79528-2_5
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DOI: https://doi.org/10.1007/978-3-642-79528-2_5
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