title: Fractionation and purification of hepatic microsomal cytochrome P-450 isoenzymes from phenobarbital-pretreated rats by h.p.l.c. A convenient tool for screening of isoenzymes inactivated by allylisopropylacetamide.
abstract: A procedure incorporating the salient features of ion-exchange column chromatography with ion-exchange h.p.l.c. is described for the fractionation and purification to homogeneity of several membrane-bound rat hepatic phenobarbital (PB)-inducible cytochrome P-450 isoenzymes, including the major PB-inducible species. The resolving power of this technique makes it a highly promising tool for the isolation and purification of closely related cytochrome P-450 isoenzymes. In addition, it may also be used for screening of individual isoenzymes either selectively induced or repressed by a variety of endobiotics or xenobiotics. Accordingly, we have exploited this particular feature to identify not only the PB-inducible cytochrome P-450 isoenzymes destroyed in vivo by allylisopropylacetamide, a suicide inactivator of cytochrome P-450, but also to distinguish those that are reparable by exogenous haemin from those that are irreparably damaged.
mesh_terms: D000818:Animals; D002848:Chromatography, DEAE-Cellulose; D002851:Chromatography, High Pressure Liquid; D003577:Cytochrome P-450 Enzyme System / Q000302:isolation & purification* / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D007527:Isoenzymes / Q000302:isolation & purification* / Q000378:metabolism; D008297:Male; D008862:Microsomes, Liver / Q000187:drug effects / Q000201:enzymology*; D010446:Peptide Fragments / Q000032:analysis; D010634:Phenobarbital / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D007527:Isoenzymes; D010446:Peptide Fragments; D003577:Cytochrome P-450 Enzyme System; D010634:Phenobarbital