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iScience. 2021 Jul 17;24(8):102878. doi: 10.1016/j.isci.2021.102878. eCollection 2021 Aug 20.

CHIP-dependent regulation of the actin cytoskeleton is linked to neuronal cell membrane integrity.

iScience

Catarina Dias, Erisa Nita, Jakub Faktor, Ailish C Tynan, Lenka Hernychova, Borivoj Vojtesek, Jesper Nylandsted, Ted R Hupp, Tilo Kunath, Kathryn L Ball

Affiliations

  1. Institute of Genetics and Cancer, University of Edinburgh, Edinburgh EH4 2XU, UK.
  2. Centre for Regenerative Medicine, Institute for Stem Cell Research, School of Biological Sciences, The University of Edinburgh, Edinburgh EH16 4UU, UK.
  3. Research Centre for Applied Molecular Oncology, Masaryk Memorial Cancer Institute, 656 53 Brno, Czech Republic.
  4. University of Gdansk, International Centre for Cancer Vaccine Science, 80-822 Gdansk, Poland.
  5. Membrane Integrity Group, Danish Cancer Society Research Center, Strandboulevarden 49, 2100, Copenhagen, Denmark.

PMID: 34401662 PMCID: PMC8350547 DOI: 10.1016/j.isci.2021.102878

Abstract

CHIP is an E3-ubiquitin ligase that contributes to healthy aging and has been characterized as neuroprotective. To elucidate dominant CHIP-dependent changes in protein steady-state levels in a patient-derived human neuronal model, CHIP function was ablated using gene-editing and an unbiased proteomic analysis conducted to compare knock-out and wild-type isogenic induced pluripotent stem cell (iPSC)-derived cortical neurons. Rather than a broad effect on protein homeostasis, loss of CHIP function impacted on a focused cohort of proteins from actin cytoskeleton signaling and membrane integrity networks. In support of the proteomics, CHIP knockout cells had enhanced sensitivity to induced membrane damage. We conclude that the major readout of CHIP function in cortical neurons derived from iPSC of a patient with elevate α-synuclein, Parkinson's disease and dementia, is the modulation of substrates involved in maintaining cellular "health". Thus, regulation of the actin cytoskeletal and membrane integrity likely contributes to the neuroprotective function(s) of CHIP.

© 2021 The Authors.

Keywords: bioinformatics; cell biology; omics; organizational aspects of cell biology; proteomics

Conflict of interest statement

The authors declare no conflict of interest.

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