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miR-216b regulation of c-Jun mediates GADD153/CHOP-dependent apoptosis

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  • Zhenhua Xu

    (Hollings Cancer Center, Medical University of South Carolina)

  • Yiwen Bu

    (Hollings Cancer Center, Medical University of South Carolina)

  • Nilesh Chitnis

    (Hollings Cancer Center, Medical University of South Carolina)

  • Costas Koumenis

    (Perelman School of Medicine, University of Pennsylvania)

  • Serge Y. Fuchs

    (School of Veterinary Medicine, 380 S. University Avenue)

  • J. Alan Diehl

    (Hollings Cancer Center, Medical University of South Carolina)

Abstract

The ability of the unfolded protein response, UPR, to regulate cell homeostasis through both gene expression and protein synthesis has been well documented. One primary pro-apoptotic protein that responds to both PERK and Ire1 signalling is the CHOP/GADD153 transcription factor. Although CHOP deficiency delays onset of cell death, questions remain regarding how CHOP regulates apoptosis. Here, we provide evidence demonstrating that CHOP/GADD153-dependent apoptosis reflects expression of micro-RNA, miR-216b. MiR-216b accumulation requires PERK-dependent induction of CHOP/GADD153, which then directly regulates miR-216b expression. As maximal expression of miR-216b is antagonized by Ire1, miR-216b accumulation reflects the convergence of PERK and Ire1 activities. Functionally, miR-216b directly targets c-Jun, thereby reducing AP-1-dependent transcription and sensitizing cells to ER stress-dependent apoptosis. These results provide direct insight into the molecular mechanisms of CHOP/GADD153-dependent cell death.

Suggested Citation

  • Zhenhua Xu & Yiwen Bu & Nilesh Chitnis & Costas Koumenis & Serge Y. Fuchs & J. Alan Diehl, 2016. "miR-216b regulation of c-Jun mediates GADD153/CHOP-dependent apoptosis," Nature Communications, Nature, vol. 7(1), pages 1-12, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11422
    DOI: 10.1038/ncomms11422
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