Immunoblot analysis of α-smooth muscle actin (α-SMA), γ2-smooth muscle actin (ACTG2), suppressor of cytokine signaling 3 (SOCS3), and α-tubulin in CCL210 fibroblasts (A) and in fibroblasts from the lungs of normal organ donors (B) after treatment with TGF-β1 (2 ng/ml) alone, PGE2 (500 nM) alone, or TGF-β1 (2 ng/ml) followed by PGE2 (500 nM). CCL210, normal adult lung fibroblast cell line.