A1 Refereed original research article in a scientific journal

Endogenous PP2A inhibitor CIP2A degradation by chaperone-mediated autophagy contributes to the antitumor effect of mitochondrial complex I inhibition




AuthorsCazzoli R, Romeo F, Pallavicini I, Peri S, Romanenghi M, Pérez-Valencia JA, Hagag E, Ferrucci F, Elgendy M, Vittorio O, Pece S, Foiani M, Westermarck J, Minucci S

Publication year2023

JournalCell Reports

Article number112616

Volume42

Issue6

eISSN2211-1247

DOIhttps://doi.org/10.1016/j.celrep.2023.112616

Web address https://www.sciencedirect.com/science/article/pii/S2211124723006277?via%3Dihub

Self-archived copy’s web addresshttps://research.utu.fi/converis/portal/detail/Publication/180005963


Abstract

Combined inhibition of oxidative phosphorylation (OXPHOS) and glycolysis has been shown to activate a PP2A-dependent signaling pathway, leading to tumor cell death. Here, we analyze highly selective mitochondrial complex I or III inhibitors in vitro and in vivo to elucidate the molecular mechanisms leading to cell death following OXPHOS inhibition. We show that IACS-010759 treatment (complex I inhibitor) induces a reactive oxygen species (ROS)-dependent dissociation of CIP2A from PP2A, leading to its destabilization and degradation through chaperone-mediated autophagy. Mitochondrial complex III inhibition has analogous effects. We establish that activation of the PP2A holoenzyme containing B56δ regulatory subunit selectively mediates tumor cell death, while the arrest in proliferation that is observed upon IACS-010759 treatment does not depend on the PP2A-B56δ complex. These studies provide a molecular characterization of the events subsequent to the alteration of critical bioenergetic pathways and help to refine clinical studies aimed to exploit metabolic vulnerabilities of tumor cells.


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