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FASEB J. 2019 Apr;33(4):5535-5547. doi: 10.1096/fj.201801987R. Epub 2019 Jan 16.

SIRT4 regulates PTEN stability through IDE in response to cellular stresses.

Author information

1
Department of Medical Genetics, Center for Medical Genetics, Peking University Health Science Center, Beijing, China.
2
Department of Biochemistry and Molecular Biology, Shenzhen University School of Medicine, Shenzhen, China.
3
Institute of Systems Biomedicine, Peking University Health Science Center, Beijing, China; and.
4
Department of Medical and Research Technology, School of Medicine, University of Maryland, Baltimore, Maryland, USA.

Abstract

Tumor suppressor phosphatase and tensin homolog deleted on chromosome 10 (PTEN) plays a critical role in regulating cell survival, cell growth, and proliferation by antagonizing the PI3K-AKT-mTOR pathway. The regulatory mechanism of PTEN protein is still not completely understood. Here, we found that Sirtuin 4 (SIRT4) interacts with PTEN and regulates its stability. Overexpression of SIRT4 in cells causes down-regulation of PTEN. This regulation is independent of PTEN acetylation and ubiquitination. We further found that SIRT4 degrades PTEN through lysosome pathway mediated by insulin degrading enzyme (IDE). SIRT4 bridges PTEN and IDE for degradation in response to nutritional starvation stresses. Our results suggest that when cells were exposed to nutritional starvation, SIRT4 was induced and cooperated with IDE to degrade PTEN; low levels of PTEN promote cells to survive from cellular stress. Our findings provide a new regulation of PTEN in response to cellular stresses.-Liu, M., Wang, Z., Ren, M., Yang, X., Liu, B., Qi, H., Yu, M., Song, S., Chen, S., Liu, L., Zhang, Y., Zou, J., Zhu, W.-G., Yin, Y., Luo, J. SIRT4 regulates PTEN stability through IDE in response to cellular stresses.

KEYWORDS:

autophagy; insulin degrading enzyme; protein stability; sirtuin 4

PMID:
30649986
DOI:
10.1096/fj.201801987R

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