TABLE 2

Model parameters for DTZ and nd-DTZ


Parameters

Values

References
PK parameters
    DTZ
        Ka (h-1) 0.9 Hermann et al., 1983
        Tlag (h) 0.5 Hermann et al., 1983
        Vc (liters) 120 Hermann et al., 1983
        Vp (liters) 141 Hermann et al., 1983
        CLr (l/h) 0.06 Hermann et al., 1983
        CLint (l/h) 900 Hermann et al., 1983
        CLint, 3A (l/h) 360a
        CLint, non3A (l/h) 540
        Vmax, 3A (mg/h) 432
        Vmax, non3A (mg/h) 648
        Vmax, GW (mg/h) 432
        Km (mg/l) 1.2 Jones et al., 1999
        fu 0.2 Piepho et al., 1982
    nd-DTZ
    Vnd-DTZ (liters) 261b
    t1/2 (h) 5 Höglund and Nilsson, 1989
    CLnd-DTZ (liters) 36c
    fu 0.2b
Physiological parameters
    VGW (livers) 0.25 Chien et al., 2006
    VPV (liters) 0.07 Ito et al., 2003
    VLIV (liters) 2.8 Ito et al., 2003
    kdeg (h-1) 0.03 Greenblatt et al., 2003
Enzyme inhibition parametersd
    DTZ
        Ki (μM) 41
        kinact (h-1) 4.2
        KI (μM) 3
    nd-DTZ
        Ki (μM) 0.8
        kinact (h-1) 3
        KI (μM)
0.3

  • a Assume that the CYP3A pathway accounts for one-third of the total metabolic clearance.

  • b Assume the same as that of DTZ.

  • c Calculated from Vnd-DTZ × kel.

  • d Estimated in vitro using HLMs; see Materials and Methods.