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Stat3 Controls Tubulointerstitial Communication during CKD

Authors
Type
Published Article
Journal
Journal of the American Society of Nephrology
Publisher
American Society of Nephrology (ASN)
Publication Date
Jul 26, 2016
Volume
27
Issue
12
Pages
3690–3705
Identifiers
DOI: 10.1681/asn.2015091014
PMID: 27153926
PMCID: PMC5118479
Source
USPC - SET - SVS
License
Green

Abstract

In CKD, tubular cells may be involved in the induction of interstitial fibrosis, which in turn, leads to loss of renal function. However, the molecular mechanisms that link tubular cells to the interstitial compartment are not clear. Activation of the Stat3 transcription factor has been reported in tubular cells after renal damage, and Stat3 has been implicated in CKD progression. Here, we combined an experimental model of nephron reduction in mice from different genetic backgrounds and genetically modified animals with in silico and in vitro experiments to determine whether the selective activation of Stat3 in tubular cells is involved in the development of interstitial fibrosis. Nephron reduction caused Stat3 phosphorylation in tubular cells of lesion-prone mice but not in resistant mice. Furthermore, specific deletion of Stat3 in tubular cells significantly reduced the extent of interstitial fibrosis, which correlated with reduced fibroblast proliferation and matrix synthesis, after nephron reduction. Mechanistically, in vitro tubular Stat3 activation triggered the expression of a specific subset of paracrine profibrotic factors, including Lcn2, Pdgfb, and Timp1. Together, our results provide a molecular link between tubular and interstitial cells during CKD progression and identify Stat3 as a central regulator of this link and a promising therapeutic target.

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