Thyroglobulin promoter activity in PC, PCPy, and PCPy-Pax8 cells.
(A) Schematic representation of the Tg reporter
constructs, wild-type (Tg-CAT) and mutated in one of the TTF-1-binding
site (Tg-CAT Acore). Gray ovals represent TTF-1, and the black
rectangle represents Pax8. (B) PC, PCPy, and one
PCPy-Pax8 clone (PCPy-4B2) were transiently transfected with 10 μg of
wild-type Tg reporter construct (Tg-CAT) or of a mutated Tg reporter
(Tg-CAT Acore), along with 2 μg of CMV-LUC. After normalization for
LUC activity, the activity of the promoters was measured relative to
that of a basal promoter.