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The SUMO E3-ligase PIAS1 couples reactive oxygen species-dependent JNK activation to oxidative cell death

Beatriz B Leitao1, Marius C Jones, Jan J Brosens

  • 1Institute of Reproductive and Developmental Biology, Imperial College London, Hammersmith Campus, London, UK.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|June 17, 2011
PubMed

Insights

Reactive oxygen species (ROS) trigger a hypersumoylation response in human endometrial stromal cells (HESCs) via c-Jun N-terminal kinase (JNK) and PIAS1. PIAS1 knockdown enhances JNK signaling and cellular defense, reducing oxidative stress-induced apoptosis.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Signaling Pathways

Background:

  • Human endometrial stromal cells (HESCs) respond to reactive oxygen species (ROS) with a hypersumoylation response dependent on c-Jun N-terminal kinase (JNK).
  • The precise mechanism linking JNK signaling to the small ubiquitin-related modifier (SUMO) pathway and its functional outcomes remain unclear.

Purpose of the Study:

  • To elucidate the mechanism coupling JNK signaling to the SUMO pathway in response to ROS in HESCs.
  • To investigate the role of PIAS1 (protein inhibitor of activated STAT1) in this signaling cascade and its impact on cellular responses to oxidative stress.

Main Methods:

  • Utilized HESCs exposed to ROS.
  • Performed PIAS1 knockdown and overexpression experiments.
  • Analyzed JNK signaling activation, SUMOylation of substrates (including c-Jun), and gene expression profiling.
  • Assessed caspase-3/7 activation and apoptosis.

Main Results:

  • ROS-dependent JNK activation converges on the SUMO pathway via PIAS1.
  • PIAS1 knockdown prevented ROS-induced hypersumoylation, enhanced JNK signaling, and altered the transcriptional response to oxidative stress.
  • PIAS1 knockdown was essential for inducing cellular defense genes and attenuated ROS-dependent apoptosis.

Conclusions:

  • PIAS1 acts as a crucial regulator, determining JNK activity levels in HESCs.
  • PIAS1 couples ROS signaling to the SUMO pathway and plays a significant role in promoting oxidative cell death.
  • Modulating PIAS1 activity impacts cellular defense mechanisms and susceptibility to oxidative stress-induced apoptosis.

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