Olfactory cytochrome P-450 immunoreactivity in mice is altered by dichlobenil but preserved by metyrapone.
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| Abstract |
Antibodies to cytochromes P-450NMa and P-450NMb (CYP2A and CYP2G1, respectively) (P-450 nomenclature by Nebert et al., DNA Cell Biol. 10, 1- (1-14) 14, 1991) were used to assess the effects of the herbicide dichlobenil on the distribution of these olfactory-specific isozymes in the olfactory mucosa. Twenty-eight hours after a single dose (12 mg/kg) of dichlobenil, characteristic regions of the olfactory mucosa showed signs of necrosis in H&E stained sections. Accompanying this was a dramatic reduction in P-450 immunoreactivity in Bowman's glands of the olfactory mucosa, and an apparent redistribution of P-450 immunoreactivity within sustentacular cells. Treatment of mice with metyrapone, a P-450 inhibitor, at 10 min prior to and 2, 4, 6, and 8 h after a single dichlobenil injection, provided some protection against the damaging effects of dichlobenil. Both the gross and subcellular appearance of P-450 immunoreactivity in metyrapone/dichlobenil treated mice was similar to controls. Western blot analysis of P-450 expression following dichlobenil or metyrapone/dichlobenil treatment was generally consistent with immunohistochemical findings. These studies support previous reports that dichlobenil-induced olfactotoxicity is cytochrome P-450 mediated.
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| Authors | E Walters, K Buchheit, J A Maruniak |
| Journal | Toxicology (Toxicology) Vol. 81 Issue 2 Pg. 113-22 (Jul 28 1993) ISSN: 0300-483X [Print] Ireland |
| PMID | 8378937 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.) |
| Chemical References |
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