Linked Life Data

9621341

Source:http://linkedlifedata.com/resource/pubmed/id/9621341

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pubmed-article:9621341pubmed:abstractTextThe membrane-bound form of epoxide hydrolase and NADPH-cytochrome P-450 (c) reductase are two important enzymes involved in the bioactivation/bioinactivation balance of cerebral tissue. In vivo, the developmental profiles and regional localizations of these two enzymes were investigated in the rat. The regional distribution study showed that they are ubiquitously present among the major brain structures. Both enzyme activities were present in the brain prior to birth, and hence tissue from early developmental stages is suitable to develop in vitro cellular or organotypic models for toxicity studies involving these metabolic pathways. Because various neurotoxicological effects can be dependent on spatio-temporally regulated cell-cell interactions, we aimed to employ organotypic tissue cultures in which the cytoarchitecture was well preserved. In such cultures, the temporal expression profiles of epoxide hydrolase and NADPH cytochrome(c) P-450 reductase reflected the in vivo situation. The technically less demanding pure neuronal and glial cell cultures were also investigated. Detoxification of benzopyrene-4,5-epoxide and superoxide production arising from the reductive metabolism of various drugs were determined in all three systems. The results indicate that though organotypic culture is a good model for the metabolic pathways studied, less complicated single cell cultures can also represent appropriate model systems, providing that the expression of the enzymes involved has been first established in these systems. NADPH-cytochrome P-450 reductase-dependent metabolism is active in both neuronal and glial cells, whereas the detoxification of reactive epoxides occurs mainly in glia.lld:pubmed
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pubmed-article:9621341pubmed:dateRevised2009-11-19lld:pubmed
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pubmed-article:9621341pubmed:year1998lld:pubmed
pubmed-article:9621341pubmed:articleTitleDrug metabolism in in vitro organotypic and cellular models of mammalian central nervous system: activities of membrane-bound epoxide hydrolase and NADPH-cytochrome P-450 (c) reductase.lld:pubmed
pubmed-article:9621341pubmed:affiliationINSERM U 325, Institut Pasteur de Lille, France.lld:pubmed
pubmed-article:9621341pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9621341pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed