Figure 2. TGF-β increases Smad2 protein phosphorylation.
(A) Phosphorylation of Smad2 occurred in a time-dependent manner after treatment with TGF-β (1 ng/ml) demonstrating that TGF-β/Smad signaling is intact in SK-N-SH cells. (B) LY294002 treatment resulted in increased phosphorylation of Smad2 by Western blot analysis. This increase was attenuated by GRP treatment. β-actin was used as a protein loading control.