Figure 3.
Osx binding site is located within 260 bp of Sost promoter. (A) Deletion analysis of Sost promoter reporter activated by Osx. Sost-1 kb, Sost-540 bp, Sost-260 bp, and Sost-106 bp Sost promoter reporter plasmids were constructed. Each plasmid was cotransfected with Osx expression plasmid in HEK293 cells. Luciferase activity was normalized by β-galactosidase activity. (B) The GC-rich element in Sost-260-M1 is responsible for Sost promoter reporter activation by Osx. Sost-260-M1 and Sost-260-M2 point mutants were constructed. Each plasmid was cotransfected with Osx expression plasmid in HEK293 cells. Luciferase activity was normalized by β-galactosidase activity.