A. Relative luciferase activity from the natural
ACTB promoter-luciferase construct (see Fig. 1A) in cells transfected with control (Ctrl),
SRF, NFYA, NFYB or SP1 siRNAs. Luciferase activity was normalized to total
protein. Luciferase activity in cells transfected with the siRNA Ctrl was
arbitrarily set to 1. Results are the means from three independent experiments.
Asterisks indicate significant differences (P<0.05) relative
to Ctrl.
B. Western blot analysis of SRF, NFYA, NFYB and SP1 proteins in
extracts of cells transfected with the control siRNA (si-Ctrl) and specific
siRNAs as indicated.