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Autophagy. 2018;14(11):1911-1927. doi: 10.1080/15548627.2018.1491491. Epub 2018 Aug 16.

Loss of the novel Vcp (valosin containing protein) interactor Washc4 interferes with autophagy-mediated proteostasis in striated muscle and leads to myopathy in vivo.

Author information

1
a Molecular Cardiology, Department of Internal Medicine II , University of Ulm , Ulm , Germany.
2
b Institute of Molecular Genetics and Cell Biology, Department of Biology , University of Ulm , Ulm , Germany.
3
c Institute of Medical Systems Biology , University of Ulm , Ulm , Germany.
4
d Centre for Biochemistry, Institute of Biochemistry I, Medical Faculty , University of Cologne , Cologne , Germany.
5
e Department of Neurology, Heimer Institute for Muscle Research , University Hospital Bergmannsheil, Ruhr-University Bochum , Bochum , Germany.
6
f Institute of Neuropathology , University Hospital Erlangen , Erlangen , Germany.
7
g Department of Biomedical Science, Venetian Institute of Molecular Medicine (VIMM) , University of Padova , Padova , Italy.
8
h Department of Internal Medicine II , University of Ulm , Ulm , Germany.

Abstract

VCP/p97 (valosin containing protein) is a key regulator of cellular proteostasis. It orchestrates protein turnover and quality control in vivo, processes fundamental for proper cell function. In humans, mutations in VCP lead to severe myo- and neuro-degenerative disorders such as inclusion body myopathy with Paget disease of the bone and frontotemporal dementia (IBMPFD), amyotrophic lateral sclerosis (ALS) or and hereditary spastic paraplegia (HSP). We analyzed here the in vivo role of Vcp and its novel interactor Washc4/Swip (WASH complex subunit 4) in the vertebrate model zebrafish (Danio rerio). We found that targeted inactivation of either Vcp or Washc4, led to progressive impairment of cardiac and skeletal muscle function, structure and cytoarchitecture without interfering with the differentiation of both organ systems. Notably, loss of Vcp resulted in compromised protein degradation via the proteasome and the macroautophagy/autophagy machinery, whereas Washc4 deficiency did not affect the function of the ubiquitin-proteasome system (UPS) but caused ER stress and interfered with autophagy function in vivo. In summary, our findings provide novel insights into the in vivo functions of Vcp and its novel interactor Washc4 and their particular and distinct roles during proteostasis in striated muscle cells.

KEYWORDS:

Proteostasis; Vcp; Washc4; striated muscle; zebrafish

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