Table 1. Overexpression of FTF or FTFΔLBD increases 12α-hydroxylase promoter–luciferase construct activity in Hep3B cells.
Expression plasmid | Promoter activity | Regulation (%) | |
|
–CDCA |
+CDCA |
|
Control (GHR) | 100 | 102 ± 15 | 100 (3) |
Wild-type FTF | 769 ± 362 | 432 ± 161 | 58 ± 8 (4)a |
HNF-4 | 199 ± 34 | 276 ± 96 | 131 ± 32 (3)b |
FTFΔLBD | 296 ± 137 | 316 ± 155 | 106 ± 10 (3)b |
FTFΔAF-2 | ND | ND | ND |
pCMV-GHR, as a control, pCI-FTF, pCI-HNF-4, pCI-FTFΔLBD or pCI-FTFΔAF-2 was co-transfected into Hep3B cells together with pGL3-R12α-865. Cells were treated with or without 100 µM CDCA, harvested and analyzed for luciferase and β-galactosidase activities as described in Materials and Methods. The data were normalized to the activity produced by construct pGL3-R12α-865 co-transfected with the control plasmid pCMV-GHR in the absence of CDCA and represent the averages of (n) experiments ± SD. ND, not detectable.
aDiffers from the control (P < 0.05).
bDoes not differ from the control (P > 0.1).