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Lake, Brian G; Price, Roger J; Giddings, Amanda M; Walters, David G
Methods in molecular biology (Clifton, N.J.), 2009, Letnik: 481Journal Article
Hepatic microsomal cytochrome P450 (CYP) forms have a major role in the metabolism of drugs and other chemicals. Primary hepatocyte cultures from humans and experimental animals are a valuable in vitro system for studying the effects of chemicals on CYP forms. This chapter describes methods to evaluate CYP form induction in human and rat hepatocytes cultured in a 96-well plate format. The use of a 96-well plate format permits studies to be performed with relatively small numbers of hepatocytes and obviates the need to harvest cells and prepare subcellular fractions prior to the assay of enzyme activities. The induction of CYP1A and CYP3A forms in human and rat hepatocytes can be determined by measurement of 7-ethoxyresorufin O-deethylase and testosterone 6beta-hydroxylase activities, respectively, whereas 7-benzyloxy-4-trifluoromethylcoumarin (BFC) O-debenzylase can be employed to assess both CYP1A and CYP2B form induction in rat hepatocytes. An assay for determining the protein content of hepatocytes cultured in a 96-well plate format is also described.
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