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J Biol Chem. 2016 Jun 10;291(24):12799-808. doi: 10.1074/jbc.M116.724245. Epub 2016 Mar 31.

Nephrin Suppresses Hippo Signaling through the Adaptor Proteins Nck and WTIP.

Author information

1
From the Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario N1G 2W1, Canada.
2
From the Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario N1G 2W1, Canada jonesmcb@uoguelph.ca.

Abstract

Podocytes are key components of the kidney blood filtration barrier, and their ability to withstand hemodynamic strain is proposed to be closely tied to their unique and flexible cytoarchitecture. However, the mechanisms that control such mechanotransduction are poorly understood. We have previously established that tyrosine phosphorylation of the transmembrane protein nephrin promotes recruitment of the Nck1/2 cytoskeletal adaptor proteins and downstream actin remodeling. We now reveal that Nck integrates nephrin with the Hippo kinase cascade through association with the adaptor protein WTIP. Using mutational analysis, we show that Nck sequesters WTIP and its binding partner Lats1 to phosphorylated nephrin, resulting in decreased phospho-activation of Lats1. We further demonstrate that, coincident with nephrin dephosphorylation in a transient model of podocyte injury in mice, Lats1 is rapidly activated, and this precedes significant down-regulation of the transcription regulator Yap. Moreover, we show reduced levels of Yap protein in mice with chronic disruption of nephrin phospho-signaling. Together, these findings support the existence of a dynamic molecular link between nephrin signaling and the canonical Hippo pathway in podocytes, which may facilitate the conversion of mechanical cues to biochemical signals promoting podocyte viability.

KEYWORDS:

Hippo pathway; Nck; WTIP; kidney; nephrin; phosphotyrosine; podocyte; signal transduction

PMID:
27033705
PMCID:
PMC4933449
DOI:
10.1074/jbc.M116.724245
[Indexed for MEDLINE]
Free PMC Article

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