2. Academic Validation
  3. KAT8 compound inhibition inhibits the initial steps of PINK1-dependant mitophagy

KAT8 compound inhibition inhibits the initial steps of PINK1-dependant mitophagy

  • Sci Rep. 2024 May 22;14(1):11721. doi: 10.1038/s41598-024-60602-9.
Capucine de Talhouët 1 2,  Noemi Esteras 3,  Marc P M Soutar 1,  Benjamin O'Callaghan 4 5,  Helene Plun-Favreau 6 7
Affiliations

Affiliations

  • 1 Department of Neurodegenerative Disease, UCL Queen Square Institute of Neurology, London, UK.
  • 2 Aligning Science Across Parkinson's (ASAP) Collaborative Research Network, Chevy Chase, MD, USA.
  • 3 Department of Biochemistry and Molecular Biology, School of Medicine, Complutense University of Madrid, Madrid, Spain.
  • 4 Department of Neurodegenerative Disease, UCL Queen Square Institute of Neurology, London, UK. ben.ocallaghan@ucl.ac.uk.
  • 5 Aligning Science Across Parkinson's (ASAP) Collaborative Research Network, Chevy Chase, MD, USA. ben.ocallaghan@ucl.ac.uk.
  • 6 Department of Neurodegenerative Disease, UCL Queen Square Institute of Neurology, London, UK. h.plun-favreau@ucl.ac.uk.
  • 7 Aligning Science Across Parkinson's (ASAP) Collaborative Research Network, Chevy Chase, MD, USA. h.plun-favreau@ucl.ac.uk.
PMID: 38777823 DOI: 10.1038/s41598-024-60602-9
Abstract

It has recently been shown that KAT8, a genome-wide association study candidate risk gene for Parkinson's Disease, is involved in PINK1/Parkin-dependant Mitophagy. The KAT8 gene encodes a lysine acetyltransferase and represents the catalytically active subunit of the non-specific lethal epigenetic remodelling complex. In the current study, we show that contrary to KAT5 inhibition, dual inhibition of KAT5 and KAT8 via the MG149 compound inhibits the initial steps of the PINK1-dependant Mitophagy process. More specifically, our study shows that following mitochondrial depolarisation induced by mitochondrial toxins, MG149 treatment inhibits PINK1-dependant Mitophagy initiation by impairing PINK1 activation, and subsequent phosphorylation of Parkin and ubiquitin. While this inhibitory effect of MG149 on PINK1-activation is potent, MG149 treatment in the absence of mitochondrial toxins is sufficient to depolarise the mitochondrial membrane, recruit PINK1 and promote partial downstream recruitment of the Autophagy receptor p62, leading to an increase in mitochondrial delivery to the lysosomes. Altogether, our study provides additional support for KAT8 as a regulator of Mitophagy and Autophagy processes.

Keywords

Autophagy; KAT8; MG149; Mitophagy; Parkinson’s disease.

Figures
Products