|
|
|
|
MI Luster, LD Lawson, P Linko and JA Goldstein
Double-antibody radioimmunoassay (RIA) procedures were developed for the determination of two forms of cytochrome P-448 in crude liver microsomes at the picogram level. The antisera used in the RIAs were produced against two forms of cytochrome P-448 isolated from livers of rats treated with 3,4,5,3',4',5'-hexachlorobiphenyl (3,4,5-HCB) and 3- methylcholanthrene (3-MC), referred to as cytochromes P-448HCB and P- 448MC, respectively. The results obtained with RIA procedures were consistent with results of radial immunodiffusion analysis, sodium dodecyl sulfate/polyacrylamide gel electrophoresis, and estimation of aryl hydrocarbon hydroxylase (AHH) activity. Utilizing the RIAs, both forms of cytochrome P-448 were found in significant quantities in liver microsomes of rats treated with 3-MC, 3,4,5-HCB, isosafrole, and Aroclor 1254 but only in minute concentrations in untreated and phenobarbital-treated rats.