TGFB1 and Peritoneal Fibrosis: Moreover, dipyridamole may alleviate the pathogenesis of peritoneal fibrosis, involving inhibiting PDGF-stimulated HPMC cell line proliferation and TGF-β-induced collagen gene expression in HPMC, possibly through modulation of the ERK pathway (Hung et al., 2001a; Hung et al., 2001b; Hung et al., 2001c).