Journal Article

<i>In vitro</i> evidence for differential involvement of CTGF, TGFβ, and PDGF‐BB in mesangial response to injury

Ingrid E. Blom, Anette J. van Dijk, Lotte Wieten, Karen Duran, Yasuhiko Ito, Livio Kleij, Mark deNichilo, Ton J. Rabelink, Jan J. Weening, Jan Aten and Roel Goldschmeding

in Nephrology Dialysis Transplantation

Published on behalf of European Renal Association - European Dialysis and Transplant Assoc

Volume 16, issue 6, pages 1139-1148
Published in print June 2001 | ISSN: 0931-0509
Published online June 2001 | e-ISSN: 1460-2385 | DOI: http://dx.doi.org/10.1093/ndt/16.6.1139
In vitro evidence for differential involvement of CTGF, TGFβ, and PDGF‐BB in mesangial response to injury

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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‐β (TGFβ). In anti‐Thy‐1.1 nephritis the initial damage is followed by mesangial repair and limited sclerosis, which involves mesangial cell (MC) activation (α‐smooth‐muscle actin (αSMA) 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 TGFβ and platelet‐derived growth factor‐BB (PDGF‐BB).

Methods and Results. Immunostaining and ELISA showed that αSMA expression and transformation of MC into myofibroblast‐like cells was induced by TGFβ, 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 TGFβ induced the proliferation of MC. In contrast, both CTGF and TGFβ 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 TGFβ, as measured by dot‐blot analysis. Anti‐CTGF completely blocked the effect of added CTGF. Moreover, anti‐CTGF significantly reduced TGFβ‐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; TGFβ; wound healing

Journal Article.  5466 words.  Illustrated.

Subjects: Nephrology

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