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 mitochon-drial 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 degra-dation through chaperone-mediated autophagy. Mitochondrial complex III inhibition has analogous effects. We establish that activation of the PP2A holoenzyme containing B568 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-B568 complex. These studies provide a molecular characterization of the events sub-sequent to the alteration of critical bioenergetic pathways and help to refine clinical studies aimed to exploit metabolic vulnerabilities of tumor cells.

Endogenous PP2A inhibitor CIP2A degradation by chaperone-mediated autophagy contributes to the antitumor effect of mitochondrial complex I inhibition / R. Cazzoli, F. Romeo, I. Pallavicini, S. Peri, M. Romanenghi, J. Alberto Perez-Valencia, E. Hagag, F. Ferrucci, M. Elgendy, O. Vittorio, S. Pece, M. Foiani, J. Westermarck, S. Minucci. - In: CELL REPORTS. - ISSN 2211-1247. - 42:6(2023 Jun), pp. 112616.1-112616.16. [10.1016/j.celrep.2023.112616]

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

F. Romeo
Secondo
;
S. Peri;M. Romanenghi;S. Pece;M. Foiani;S. Minucci
Ultimo
2023

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 mitochon-drial 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 degra-dation through chaperone-mediated autophagy. Mitochondrial complex III inhibition has analogous effects. We establish that activation of the PP2A holoenzyme containing B568 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-B568 complex. These studies provide a molecular characterization of the events sub-sequent to the alteration of critical bioenergetic pathways and help to refine clinical studies aimed to exploit metabolic vulnerabilities of tumor cells.
metabolism; PP2A; CIP2A; chaperone-mediated autophagy; cancer; fasting; OXPHOS; glycolysis
Settore MED/06 - Oncologia Medica
Settore MEDS-09/A - Oncologia medica
   Dissection of Bioenergetic Plasticity of Tumors
   ONco-Energetics_OFF
   European Commission
   Horizon 2020 Framework Programme
   852761
giu-2023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1043428
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