Transient phases of OXPHOS inhibitor resistance reveal underlying metabolic heterogeneity in single cells

Nont Kosaisawe, Breanne Sparta, Michael Pargett, Carolyn K. Teragawa, John G. Albeck

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Cell-to-cell heterogeneity in metabolism plays an unknown role in physiology and pharmacology. To functionally characterize cellular variability in metabolism, we treated cells with inhibitors of oxidative phosphorylation (OXPHOS) and monitored their responses with live-cell reporters for ATP, ADP/ATP, or activity of the energy-sensing kinase AMPK. Across multiple OXPHOS inhibitors and cell types, we identified a subpopulation of cells resistant to activation of AMPK and reduction of ADP/ATP ratio. This resistant state persists transiently for at least several hours and can be inherited during cell divisions. OXPHOS inhibition suppresses the mTORC1 and ERK growth signaling pathways in sensitive cells, but not in resistant cells. Resistance is linked to a multi-factorial combination of increased glucose uptake, reduced protein biosynthesis, and G0/G1 cell-cycle status. Our results reveal dynamic fluctuations in cellular energetic balance and provide a basis for measuring and predicting the distribution of cellular responses to OXPHOS inhibition.

Original languageEnglish (US)
Pages (from-to)649-665.e8
JournalCell Metabolism
Volume33
Issue number3
DOIs
StatePublished - Mar 2 2021

Keywords

  • adenosine mono-phosphate-regulated protein kinase
  • AKT
  • electron transport chain
  • FRET
  • insulin signaling
  • mammalian target of rapamycin
  • metabolic cycle
  • oligomycin
  • oscillation
  • PI3K
  • translation regulation

ASJC Scopus subject areas

  • Physiology
  • Molecular Biology
  • Cell Biology

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