Tenascin-C Promotes Acute Kidney Injury to Chronic Kidney Disease Progression by Impairing Tubular Integrity Via αvβ6 Integrin Signaling

Overview

Journal Kidney Int

Publisher Elsevier

Specialty Nephrology

Date 2020 Apr 5

PMID 32245660

Citations 41

Authors

Haili Zhu

Jinlin Liao

Xianke Zhou

Xue Hong

Dongyan Song

Fan Fan Hou

Youhua Liu

Haiyan Fu

Affiliations

Soon will be listed here.

Abstract

Tenascin-C is an extracellular matrix glycoprotein that plays a critical role in kidney fibrosis by orchestrating a fibrogenic niche. Here, we demonstrate that tenascin-C is a biomarker and a mediator of kidney fibrogenesis by impairing tubular integrity. Tenascin-C was found to be increased in kidney biopsies from patients with chronic kidney disease (CKD). In a cohort of 225 patients with CKD, the urinary tenascin-C level was markedly elevated, compared to 39 healthy individuals. Moreover, the level of urinary tenascin-C in CKD was correlated with the severity of kidney dysfunction and fibrosis. In mouse model of acute kidney injury-to-CKD induced by ischemia/reperfusion, depletion of tenascin-C preserved tubular integrity and ameliorated renal fibrotic lesions. In vitro, tenascin-C impaired tubular cell integrity by inducing partial epithelial-mesenchymal transition. Using decellularized kidney tissue scaffolds, we found that tenascin-C-enriched scaffolds facilitated tubular epithelial-mesenchymal transition ex vivo. Mechanistically, tenascin-C specifically induced integrins αvβ6 in tubular cells and activated focal adhesion kinase (FAK). Blocking αvβ6 integrins or inhibition of FAK restored tubular integrity by repressing epithelial-mesenchymal transition and alleviated kidney fibrosis. Thus, our studies underscore that tenascin-C is a noninvasive biomarker of kidney fibrogenesis and a pathogenic mediator that impairs tubular integrity. Hence, blockade of the tenascin-C/αvβ6 integrin/FAK signal cascade may be a novel strategy for therapeutic intervention of kidney fibrosis.

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