TABLE 4

Effects of isoform-selective inhibitors of human P450 isoforms on the metabolism of lasofoxifene by human liver microsomes


Inhibitor

Concentration

Inhibited P450 Isoforms

Percentage Inhibition



7-Hydroxy-lasofoxifene
5-Hydroxy-lasofoxifene
μM
Control 0.0 0.0
Furafylline 40 CYP1A1/1A2 45.4 14.9
Quercetin 40 CYP2C8 60.5 22.5
Sulfaphenazole 40 CYP2C9/2C19 37.8 3.10
Quinidine 1 CYP2D6 61.3 10.2
Ketoconazole 1 CYP3A4 100 82.6
ABT
100
P450
100
100