FIGURE 3.
(A) Concentration-dependent inhibitory effects of TGF-β1/Fc on IL-4-dependent HT-2 cell proliferation. HT-2 cells were stimulated with rIL-4 and cultured in the presence of the indicated concentrations of rTGF-β1, TGF-β1/Fc or IgG4 for 24 h. [3H] thymidine incorporation was measured. Data are expressed as the mean percentage of inhibition from three independent experiments. (B) Western blot analysis for the expression of pSmad2 and Smad2 in HT-2 cells treated with rTGF-β1, TGF-β1/Fc or IgG4 for 24 h. The same lysates were also used to evaluate the expression of β-actin as loading control. One of two similar experiments is shown.