Abstract
The polycyclic aromatic hydrocarbons are a widespread class of environmental contaminants which express their tumorigenic activity through metabolic transformation to chemically reactive species which covalently modify cellular macromolecules. Ten years ago1’2 we proposed that bay-region diol epoxides are prime candidates for the ultimate carcinogenic metabolites of the carcinogenic hydrocarbons provided that these molecules contained a bay-region and were capable of being metabolically transformed to such diol epoxides. The noncarcinogen phenanthrene is the simplest hydrocarbon that contains a bay region, the sterically hindered, cup-shaped area between carbons-4 and -5 of the molecule. The metabolic transformation of this hydrocarbon3,4 into bay-region diol epoxides is illustrated in Figure 1. Initially the hydrocarbon is oxidized by the cytochrome P450 monooxygenase system to form a 1,2-oxide that is subsequently converted in the presence of microsomal epoxide hydrolase to a trans-1,2-dihydrodiol by allylic attack of water. Although many arene oxides show a marked tendency to isomerize spontaneously to phenols.5 epoxide hydrolase is often highly competitive in intercepting these reactive species. The 1,2-dihydrodiol is subject to further attack by the cytochrome P450 system to form a mixture of diastereomerically related diol epoxides in which the benzylic hydroxyl group is either cis (isomer-1 series) or trans (isomer-2 series) to the epoxide oxygen. One of the interesting features of these diol epoxides is that the isomer-1 series shows a slight preference for the conformation in which the hydroxyl groups are pseudoaxial whereas the isomer-2 series shows a marked preference for the conformation in which these groups are pseudo-equatorial (vide NMR).6-8These conformational preferences can be altered through structural variations as will be discussed later.
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© 1986 Plenum Press, New York
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Jerina, D.M. et al. (1986). Reactivity and Tumorigenicity of Bay-Region Diol Epoxides Derived from Polycyclic Aromatic Hydrocarbons. In: Kocsis, J.J., Jollow, D.J., Witmer, C.M., Nelson, J.O., Snyder, R. (eds) Biological Reactive Intermediates III. Advances in Experimental Medicine and Biology, vol 197. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-5134-4_2
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