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. 2011 May 9;208(5):961–972. doi: 10.1084/jem.20101629

Figure 4.

Figure 4.

5-HT exerts its profibrotic effects via activation of TGF-β/Smad-dependent pathways. (A and B) mRNA levels of TGF-β1 (A) and PAI-1 (B) in 5-HT–stimulated SSc fibroblasts (n = 9, three independent series). (C) Nuclear accumulation of p-Smad3 protein complexes after 12 and 24 h of stimulation with 1 µM 5-HT (n = 3). (D–F) mRNA expression of col 1a1 (D), col 1a2 (E), and fibronectin-1 (F) upon incubation with 500 ng/ml of neutralizing antibodies (Ab) against TGF-β1 in 5-HT–stimulated SSc fibroblasts (n = 5 each, two independent series). *, P < 0.05 compared with 5-HT–stimulated (D–F) or nonstimulated (A and B) controls. Error bars indicate SE.