OAREKI required for CAR to activate the CYP2B6
promoter. The –1.8 kb promoter, its deletion mutant (–1.8 kb
ΔOAREKI), PBREM/–307, or its deletion mutant
(PBREM/–307ΔOAREKI) was co-transfected with phRL-SV40
into Ym17 (A and B) or HepG2 (C and D)
cells. The cells were treated with Me2SO (DMSO), 250
nm TCPOBOP (TC), 10 nm OA, or TCPOBOP plus OA
(OA&TC) and were harvested for measuring luciferase activity.
Reporter activity was calculated by dividing firefly luciferase with
Renilla luciferase activities (A and C). -Fold
activation was calculated by taking control activity (Me2SO) as 1
(B and D). WT, wild type.