Table 3

Apparent kinetic parameters of NB-506 glucuronidation in mouse, rat, dog and human liver microsomes

Liver MicrosomesApparent KmApparentVmaxApparentVmax/Km
μM pmol/min/mg μl/min/mg
Mouse6.6  ± 0.340.6  ± 6.46.1  ± 0.7
159.1  ± 8.8168.9  ± 15.11.1  ± 0.1
Rat5.8  ± 0.652.4  ± 6.69.1  ± 0.5
Human75.1  ± 1.5641.7  ± 2988.5  ± 3.8
  • Each value represents the mean ± S.D. of three experiments. Glucuronidation of NB-506 was not observed in dog liver microsomes.