Table 1

Microsomal CYP enzyme activities in freshly cut and 1-h cultured human liver slices

Enzyme Activity1-aNo. of LiversLiver Slice Microsomes1-b
Freshly CutCultured for 1 h
7-EthoxyresorufinO-deethylase313.6  ± 7.513.0  ± 5.9
Tolbutamide methylhydroxylase349.2  ± 26.651.0  ± 18.5
Debrisoquine 4-hydroxylase319.4  ± 6.737.2  ± 16.7
Testosterone 6β-hydroxylase4356  ± 240396  ± 265
  • 1-a  Units, pmol/min/mg of protein.

  • 1-b  Results are mean ± S.E.