Polycomb group proteins as epigenetic mediators of neuroprotection in ischemic tolerance

Martha Stapels, Chelsea Piper, Tao Yang, Minghua Li, Cheri Stowel, Zhi Gang Xiong, Julie Saugstad, Roger P. Simon, Scott Geromanos, James Langridge, Jing Quan Lan, An Zhou

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

Exposing the brain to sublethal ischemia affects the response to a subsequent, otherwise injurious ischemia, resulting in transcriptional suppression and neuroprotection, a response called ischemic tolerance. Here, we show that the proteomic signature of the ischemic-tolerant brain is characterized by increased abundance of transcriptional repressors, particularly polycomb group (PcG) proteins. Knocking down PcG proteins precluded the induction of ischemic tolerance, whereas in an in vitro model, overexpressing the PcG proteins SCMH1 or BMI1 induced tolerance to ischemia without preconditioning. We found that PcG proteins are associated with the promoter regions of genes encoding two potassium channel proteins that show decreased abundance in ischemic-tolerant brains. Furthermore, PcG proteins decreased potassium currents in cultured neuronal cells and knocking down potassium channels elicited tolerance without preconditioning. These findings reveal a previously unknown mechanism of neuroprotection that involves gene repressors of the PcG family.

Original languageEnglish (US)
Pages (from-to)ra15
JournalScience signaling
Volume3
Issue number111
DOIs
StatePublished - Mar 2 2010

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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