| Abstract: | Seven modulators of mammalian monooxygenase activity were evaluated for their ability to selectively stimulate or inhibit in vitro monooxygenase activities of hepatic microsomes from mallard ducklings treated with phenobarbital, ?-naphthoflavone, 3,3‘,4,4‘,5-pentachlorobiphenyl or vehicle. Microsomes were assayed fluorometrically for four monooxygenases: benzyloxy, ethoxy, methoxy, and pentoxyresorufin-O-dealkylase, in combination with each of the seven modulators. Four combinations: ?-naphthoflavone and 2-methylbenzimidazole with benzyloxyresorufin, and Proadifen with methoxy- and ethoxyresorufin, respectively, were evaluated further. ?-naphthoflavone-treated groups were clearly distinguished from the corn oil vehicle control group by all of the assays and by the effects of the modulators in three of the four assay/modulator combinations. Enzyme activities of the phenobarbital and saline groups were statistically similar (P ?.05) when assayed without modulator added, but each assay/modulator combination distinguished between these groups. The PCB-treated group was distinguished from the corn oil vehicle control group only for BROD activity, with or without the presence of modulator. Graphing of per cent modulation of BROD activity versus initial BROD activity provided the clearest distinction between all of the study groups. Identification of these selective in vitro modulators may improve detection and measurement of low level cytochrome P450 induction in avian species. |
| Genre: | Article |
| ProdID: | 5223780 |
| Citation Author: | Renauld, A.E.; Melancon, M.J.; Sordillo, L.M. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation End Page: | 281 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Comparative Biochemistry and Physiology, C |
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| Citation Number Of Pages: | 9 |
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| Citation Phsyical Description: | 273-281 |
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| Citation Search Results Text: | Identification of in vitro cytochrome P450 modulators to detect induction by prototype inducers in the mallard duckling (Anas platyrhynchos); 1999; Article; Journal; Comparative Biochemistry and Physiology, C; Renauld, A.E.; Melancon, M.J.; Sordillo, L.M. |
| Citation Start Page: | 273 |
| Citation Volume: | 122 |
| Citation Year: | 1999 |
| Type: | citation/reference |
| Text: | Identification of in vitro cytochrome P450 modulators to detect induction by prototype inducers in the mallard duckling (Anas platyrhynchos); 1999; Article; Journal; Comparative Biochemistry and Physiology, C; Renauld, A.E.; Melancon, M.J.; Sordillo, L.M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DOCUMENT): | http://dx.doi.org/10.1016/S0742-8413(98)10119-6 |
| Date Other: | Wed, 16 Jun 2010 12:18 -0500 |
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