A YAP/TAZ–ARHGAP29–RhoA Signaling Axis Regulates Podocyte Protrusions and Integrin Adhesions

Author:

Rogg Manuel1ORCID,Maier Jasmin I.1ORCID,Helmstädter Martin2ORCID,Sammarco Alena1,Kliewe Felix3,Kretz Oliver45,Weißer Lisa1,Van Wymersch Clara1,Findeisen Karla1,Koessinger Anna L.1,Tsoy Olga6,Baumbach Jan67,Grabbert Markus8,Werner Martin1,Huber Tobias B.45,Endlich Nicole3,Schilling Oliver19,Schell Christoph19

Affiliation:

1. Institute of Surgical Pathology, Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany

2. Department of Medicine IV, Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany

3. Department of Anatomy and Cell Biology, University Medicine Greifswald, 17489 Greifswald, Germany

4. III. Department of Medicine, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany

5. Hamburg Center for Kidney Health (HCKH), University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany

6. Institute for Computational Systems Biology, University of Hamburg, 22607 Hamburg, Germany

7. Department of Mathematics and Computer Science, University of Southern Denmark, 5230 Odense, Denmark

8. Department of Urology, Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany

9. Freiburg Institute for Advanced Studies (FRIAS), University of Freiburg, 79106 Freiburg, Germany

Abstract

Glomerular disease due to podocyte malfunction is a major factor in the pathogenesis of chronic kidney disease. Identification of podocyte-specific signaling pathways is therefore a prerequisite to characterizing relevant disease pathways and developing novel treatment approaches. Here, we employed loss of function studies for EPB41L5 (Yurt) as a central podocyte gene to generate a cell type-specific disease model. Loss of Yurt in fly nephrocytes caused protein uptake and slit diaphragm defects. Transcriptomic and proteomic analysis of human EPB41L5 knockout podocytes demonstrated impaired mechanotransduction via the YAP/TAZ signaling pathway. Further analysis of specific inhibition of the YAP/TAZ-TEAD transcription factor complex by TEADi led to the identification of ARGHAP29 as an EPB41L5 and YAP/TAZ-dependently expressed podocyte RhoGAP. Knockdown of ARHGAP29 caused increased RhoA activation, defective lamellipodia formation, and increased maturation of integrin adhesion complexes, explaining similar phenotypes caused by loss of EPB41L5 and TEADi expression in podocytes. Detection of increased levels of ARHGAP29 in early disease stages of human glomerular disease implies a novel negative feedback loop for mechanotransductive RhoA—YAP/TAZ signaling in podocyte physiology and disease.

Funder

German Research Foundation

German Federal Ministry of Education and Research

University of Freiburg

Publisher

MDPI AG

Subject

General Medicine

Reference63 articles.

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