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Antifibrotic Effect of BMP-7 in the Peritoneum and the Mechanism  

Seo, Ji-Yeon (Hyonam Kidney Laboratory, Soon Chun Hyang University)
Ha, Hun-Joo (Ewha Womans University College of Pharmacy)
Yu, Mi-Ra (Hyonam Kidney Laboratory, Soon Chun Hyang University)
Kim, Jae-Ryong (Yeungnam University College of Medicine)
Ahn, Myun-Whan (Yeungnam University College of Medicine)
Lee, Hi-Bahl (Hyonam Kidney Laboratory, Soon Chun Hyang University)
Publication Information
Kidney Research and Clinical Practice / v.26, no.1, 2007 , pp. 34-44 More about this Journal
Abstract
Purpose: Bone morphogenic protein (BMP)-7, a member of TGF-β1 superfamily, is an endogenous antifibrotic protein highly expressed in normal kidney. It is not known, however, whether human peritoneal mesothelial cells (HPMC) express BMP-7 or if BMP-7 protects against peritoneal fibrosis and by what mechanism. We examined the effect of BMP-7 overexpression in TGF-β1-induced epithelial-mesenchymal transition (EMT) of HPMC and in TGF-β1 signaling in HPMC to elucidate the mechanisms of antifibrotic effect of BMP-7. Methods: Growth arrested and synchronized HPMC were stimulated with 2 ng/mL of TGF-β1 to induce EMT. HPMC were transiently transfected with adenovirus-mediated human BMP-7 (AdBMP-7) or with GFP (AdGFP). EMT was defined as downregulation of E-cadherin and upregulation of α-smooth muscle actin (SMA). Results: HPMC constitutively expressed BMP-7 mRNA and protein. BMP-7 mRNA and protein expression were significantly inhibited by 50 mM D-glucose, 2x diluted commercial peritoneal dialysis solution, and 2 ng/ml of TGF-β1. Transfection of AdBMP-7 resulted in 2.5-fold increase in BMP-7 mRNA expression in HPMC. TGF-β1 significantly decreased E-cadherin and increased α-SMA expression in GFP transfected cells. BMP-7 overexpression effectively reversed TGF-β1-induced E- cadherin and α-SMA expression and significantly suppressed TGF-β1-induced phosphorylation of Smad2/3, ERK1/2, JNK, and p38 MAPK in HPMC as compared to GFP transfected cells. Conclusion: BMP-7 is an endogenous antifibrotic protein and downregulation of BMP-7 in HPMC by high glucose, PD solution, and TGF-β1 may permit the development of peritoneal fibrosis during long-term PD. Our data demonstrate that BMP-7 overexpression reverses TGF-β1-induced EMT of HPMC and consequent peritoneal fibrosis possibly through inhibition of Smad2/3 and MAPK phosphorylation.
Keywords
Bone morphogenetic protein 7; Mitogen activated-protein kinase; Transforming growth factor-$\beta1$;
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