Nephrol Dial Transplant (2001) 16: 1139-1148
© 2001 European Renal Association-European Dialysis and Transplant Association
In vitro evidence for differential involvement of CTGF, TGFß, and PDGF-BB in mesangial response to injury
1 Department of Pathology, University Medical Center Utrecht, 2 Department of Pathology, Academic Medical Center, University of Amsterdam, The Netherlands, 3 Department of Internal Medicine, Chubu Rousai Hospital, Nagoya, Japan, 4 Department of Vascular Medicine, University Medical Center Utrecht, The Netherlands and 5 FibroGen Inc., South San Francisco, USA
Background. Connective tissue growth factor (CTGF) is a profibrotic growth factor, which is upregulated in wound healing and renal fibrosis, including anti-Thy-1.1 nephritis. The kinetics of CTGF mRNA expression in anti-Thy-1.1 nephritis suggested that CTGF regulation might contribute to glomerular response to injury downstream of transforming growth factor-ß (TGFß). In anti-Thy-1.1 nephritis the initial damage is followed by mesangial repair and limited sclerosis, which involves mesangial cell (MC) activation (
-smooth-muscle actin (SMA) expression), proliferation, migration, and extracellular matrix production. The present in vitro study addresses the possible role of CTGF in these different aspects of mesangial response to injury, and how CTGF activity might relate to effects of TGFß and platelet-derived growth factor-BB (PDGF-BB).
Methods and Results. Immunostaining and ELISA showed that SMA expression and transformation of MC into myofibroblast-like cells was induced by TGFß, but not affected by PDGF-BB, CTGF, or neutralizing anti-CTGF antibodies. [3H]thymidine incorporation and Ki67 staining demonstrated that, unlike PDGF-BB, neither CTGF nor TGFß induced the proliferation of MC. In contrast, both CTGF and TGFß induced MC migration, as evidenced by approximation of wound edges in scrape-wounded, non-proliferating rat MC monolayers. In addition, fibronectin expression was upregulated by both CTGF and TGFß, as measured by dot-blot analysis. Anti-CTGF completely blocked the effect of added CTGF. Moreover, anti-CTGF significantly reduced TGFß-induced increase in fibronectin.
Conclusion. It thus appears that CTGF is specifically involved in a subset of the adaptive changes of MC involved in mesangial repair and sclerosis, which makes it an interesting candidate target for future intervention strategies.
Keywords: CTGF; extracellular matrix; mesangial; migration; TGFß; wound healing
Correspondence and offprint requests to: R. Goldschmeding MD, Department of Pathology, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands.
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