Open Access

Transcriptional factor Nrf2 is essential for aggresome formation during proteasome inhibition

  • Authors:
    • Siyue Qin
    • Changan Jiang
    • Ju Gao
  • View Affiliations

  • Published online on: October 21, 2019     https://doi.org/10.3892/br.2019.1247
  • Pages: 241-252
  • Copyright: © Qin et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Aggrephagy, the aggresome‑related protein degradation system, represents a protective cellular response to shuttle misfolded proteins into the microtubule‑organizing center for degradation through the autophagic pathway during stress conditions, including heat shock, oxidative stress and proteasome inhibition. In response to proteasome failure, many genes are transcriptionally activated to facilitate ubiquitinated proteins to be cleared via the aggrephagy pathway. Although many regulators involved in aggresome formation have been identified, the mechanism how transcriptional activation promotes aggresome formation remains unknown. Here, we have demonstrated that nuclear factor erythroid 2‑related factor 2 (Nrf2) accumulated in the nucleus and activated the transcription of sequestosome‑1 (p62) during proteasome inhibition in 293 cells. Loss of Nrf2 resulted in failure of aggresome formation and cell death; whereas overexpression of p62 alleviated Nrf2 knockdown‑induced aggresome formation defects and promoted cell survival. Notably, blocking Nrf2 activation using a p38/MAPK inhibitor prevented proteasome inhibitor‑induced aggresome formation. These findings suggested that Nrf2 may be a critical regulator of aggresome formation, which protects cells from proteasome dysfunction‑induced stress.

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December 2019
Volume 11 Issue 6

Print ISSN: 2049-9434
Online ISSN:2049-9442

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Copy and paste a formatted citation
APA
Qin, S., Jiang, C., & Gao, J. (2019). Transcriptional factor Nrf2 is essential for aggresome formation during proteasome inhibition. Biomedical Reports, 11, 241-252. https://doi.org/10.3892/br.2019.1247
MLA
Qin, S., Jiang, C., Gao, J."Transcriptional factor Nrf2 is essential for aggresome formation during proteasome inhibition". Biomedical Reports 11.6 (2019): 241-252.
Chicago
Qin, S., Jiang, C., Gao, J."Transcriptional factor Nrf2 is essential for aggresome formation during proteasome inhibition". Biomedical Reports 11, no. 6 (2019): 241-252. https://doi.org/10.3892/br.2019.1247