Adenovirus-mediated gene transfer of TGF-β1 to the renal glomeruli leads to proteinuria

Ayesha Ghayur, Limin Liu, Martin Kolb, Arun Chawla, Shahid Lambe, Anil Kapoor, Peter J. Margetts

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The mechanism of proteinuria in many common kidney diseases involves glomerular hemodynamic effects and local expression of angiogenic, fibrogenic, and vasoactive factors. Transforming growth factor (TGF)-β has been associated with many diseases involving proteinuria and renal fibrosis. TGF-β has been shown to induce podocyte dedifferentiation in vitro, but its in vivo effects on the glomerular filtration barrier are not well described. In this study, we used an adenovirus vector to transfer active TGF-β1 to the glomeruli of rat kidneys. Transient TGF-β1 overexpression induced significant proteinuria, podocyte foot process effacement, nephrin down-regulation, and nephrinuria. The expression of synaptopodin was also significantly down-regulated by TGF-β1. Increased glomerular expression of Snail, suggestive of an in vivo dedifferentiation process, was associated with a loss of podocyte epithelial markers. The expression of angiopoietin-1 and angiopoietin-2 was significantly increased in TGF-β1transfected glomeruli, and TGF-β1 increased the expression of the angiopoietin receptor, Tie2, in podocyte cell culture. TGF-β1 down-regulated nephrin and synaptopodin expression in podocytes in cell culture; this effect was reversed by the blockade of both angiopoietin and Tie2 activities. These findings suggest that locally produced TGF-β1 can cause podocyte dedifferentiation marked by a loss of synaptopodin, nephrin, and foot process effacement, partly regulated by angiopoietins. This process represents a novel pathway that may explain proteinuria in a variety of common renal diseases.

Original languageEnglish
Pages (from-to)940-951
Number of pages12
JournalAmerican Journal of Pathology
Volume180
Issue number3
DOIs
Publication statusPublished - 01-03-2012
Externally publishedYes

Fingerprint

Transforming Growth Factors
Proteinuria
Adenoviridae
Podocytes
Kidney
Angiopoietins
Genes
TIE-2 Receptor
Glomerular Filtration Barrier
Cell Culture Techniques
Kidney Glomerulus
Angiopoietin-2
Angiopoietin-1
Kidney Diseases
Foot
Fibrosis
Down-Regulation
Hemodynamics

All Science Journal Classification (ASJC) codes

  • Pathology and Forensic Medicine

Cite this

Ghayur, A., Liu, L., Kolb, M., Chawla, A., Lambe, S., Kapoor, A., & Margetts, P. J. (2012). Adenovirus-mediated gene transfer of TGF-β1 to the renal glomeruli leads to proteinuria. American Journal of Pathology, 180(3), 940-951. https://doi.org/10.1016/j.ajpath.2011.11.023
Ghayur, Ayesha ; Liu, Limin ; Kolb, Martin ; Chawla, Arun ; Lambe, Shahid ; Kapoor, Anil ; Margetts, Peter J. / Adenovirus-mediated gene transfer of TGF-β1 to the renal glomeruli leads to proteinuria. In: American Journal of Pathology. 2012 ; Vol. 180, No. 3. pp. 940-951.
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Ghayur, A, Liu, L, Kolb, M, Chawla, A, Lambe, S, Kapoor, A & Margetts, PJ 2012, 'Adenovirus-mediated gene transfer of TGF-β1 to the renal glomeruli leads to proteinuria', American Journal of Pathology, vol. 180, no. 3, pp. 940-951. https://doi.org/10.1016/j.ajpath.2011.11.023

Adenovirus-mediated gene transfer of TGF-β1 to the renal glomeruli leads to proteinuria. / Ghayur, Ayesha; Liu, Limin; Kolb, Martin; Chawla, Arun; Lambe, Shahid; Kapoor, Anil; Margetts, Peter J.

In: American Journal of Pathology, Vol. 180, No. 3, 01.03.2012, p. 940-951.

Research output: Contribution to journalArticle

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AU - Ghayur, Ayesha

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