Proteotoxic stress is a driver of the loser status and of cell competition

Michael E Baumgartner, Michael Dinan, Paul F Langton, Iwo Kucinski, Eugenia Piddini*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

9 Citations (Scopus)
28 Downloads (Pure)

Abstract

Cell competition allows winner cells to eliminate less fit loser cells in tissues. In Minute cell competition, cells with a heterozygous mutation in ribosome genes, such as RpS3+/− cells, are eliminated by wild-type cells. How cells are primed as losers is partially understood and it has been proposed that reduced translation underpins the loser status of ribosome mutant, or Minute, cells. Here, using Drosophila, we show that reduced translation does not cause cell competition. Instead, we identify proteotoxic stress as the underlying cause of the loser status for Minute competition and competition induced by mahjong, an unrelated loser gene. RpS3+/− cells exhibit reduced autophagic and proteasomal flux, accumulate protein aggregates and can be rescued from competition by improving their proteostasis. Conversely, inducing proteotoxic stress is sufficient to turn otherwise wild-type cells into losers. Thus, we propose that tissues may preserve their health through a proteostasis-based mechanism of cell competition and cell selection.
Original languageEnglish
Pages (from-to)136-146
Number of pages11
JournalNature Cell Biology
Volume23
Issue number2
DOIs
Publication statusPublished - 25 Jan 2021

Keywords

  • Cell competition
  • ribosome mutation
  • ribosomopathy
  • proteotoxic stress
  • autophagy
  • proteasome
  • Drosophila
  • aneuploidy
  • FOXO
  • Rapamycin

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