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USP22 knockdown protects against cerebral ischemia/reperfusion injury via destabilizing PTEN protein and activating the mTOR/TFEB pathway

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Abstract

Ubiquitin-specific protease 22 (USP22) expression was reported to be increased in response to ischemic brain damage, but the biological role and underlying mechanism remain little understood. USP22 shRNA was intravenously injected into the mouse brain, and then a middle cerebral artery occlusion/reperfusion (MCAO/R) mouse model was constructed, and the infarct volume, neurobehavioral deficit score, cell apoptosis, oxidative stress, and autophagy in vivo were evaluated. Oxygen-glucose deprivation/reperfusion (OGD/R) treated pheochromocytoma-12 (PC12) cells were used as an in vitro model of ischemia/reperfusion. The effects of USP22 on proliferation, apoptosis, oxidative stress, and autophagy were explored by CCK-8, flow cytometry, ELISA, and Western blot assays. The relationship between USP22 and the phosphatase and tensin homolog (PTEN) was measured by Co-IP and Western blot assays. Both USP22 and PTEN were highly expressed in MCAO/R mouse brain tissues and OGD/R-induced PC12 cells. In vitro, USP22 knockdown strongly improved OGD/R-mediated changes in cell viability, apoptosis, oxidative stress, and lactate dehydrogenase (LDH) production in PC12 cells. USP22 bound to PTEN and stabilized PTEN expression by decreasing its ubiquitination. PTEN overexpression reversed the promoting effect of USP22 knockdown on cell viability and the inhibitory effects of USP22 knockdown on apoptosis, oxidative stress, and LDH release rate in PC12 cells subjected to OGD/R. PTEN silencing elevated the protein levels of p62, p-mTOR, TFEB, and LAMP1 and reduced the protein levels of LC3-II/LC3-I. USP22 expression levels were negatively correlated with mTOR expression levels, and USP22-shRNA-mediated expression of p62, p-mTOR, TFEB, and LAMP1 was reversed by rapamycin, an inhibitor of mTOR. In vivo, USP22 silencing significantly alleviated infarct volume, neurobehavioral impairments, cell apoptosis, oxidative stress, and autophagy in MCAO/R mice. USP22 knockdown exerts neuroprotective effects in cerebral ischemia/reperfusion injury by downregulating PTEN and activating the mTOR/TFEB pathway.

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Data availability

The datasets used during the present study are available from the corresponding author upon reasonable request.

Abbreviations

USP22:

Ubiquitin-specific protease 22

PTEN:

Phosphatase and tensin homolog

MCAO/R:

Middle cerebral artery occlusion/reperfusion

I/R:

Ischemia/reperfusion

OGD/R:

Oxygen-glucose deprivation/ reperfusion

PC12 cells:

Pheochromocytoma-12cells

LDH:

Lactate dehydrogenase

Ub:

Ubiquitin

DUBs:

Deubiquitinating enzymes

CCA:

Common carotid artery

ECA:

External carotid artery

ICA:

Internal carotid artery

FBS:

Fetal bovine serum

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Authors and Affiliations

Authors

Contributions

Yanling Li and Jing Gao wrote the manuscript. Chuntian Liu and Yanling Li designed this study. Ning Bu and Shuqin Zhan performed the experimental work. Haiqin Wu and Ru Zhang provided the majority of statistical analysis as well as provided the figures and tables for the manuscript. Hong Sun and Hong Fan collected a large amount of data for the dataset. All authors read and approved the final manuscript. Yanling Li and Hong Su performed double-blind examinations. The authors declare that all data were generated in-house and that no paper mill was used.

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Correspondence to Yanling Li.

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Ethics approval

This study was approved by the Animal Care and Use Committee of the Second Affiliated Hospital of Xi’an Jiaotong University (ethical approval number: XAJTDX-2020-046).

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The authors declare no competing financial interests regarding the publication of the present study.

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Li, Y., Gao, J., Liu, C. et al. USP22 knockdown protects against cerebral ischemia/reperfusion injury via destabilizing PTEN protein and activating the mTOR/TFEB pathway. Naunyn-Schmiedeberg's Arch Pharmacol 396, 3163–3175 (2023). https://doi.org/10.1007/s00210-023-02524-3

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