Abstract
SET domain protein 3 (SETD3) is an actin-specific methyltransferase, a rare post-translational modification with limited known biological functions. Till now, the function of SETD3 in cerebral ischemia-reperfusion (I/R)-induced injury remains unknown. Here, we show that the protein level of SETD3 is decreased in rat neurons after cerebral I/R injury. SETD3 promotes neuronal survival after both glucose and oxygen deprivation/reoxygenation (OGD/R) and cerebral I/R injury, and knockdown of SETD3 increases OGD/R-induced neuronal death. We further show that OGD/R-induced downregulation of SETD3 leads to the decrease of cellular ATP level, the reduction of mitochondrial electric potential and the increase of ROS production, thereby promoting mitochondrial dysfunction. We found that SETD3 reduction-induced mitochondrial dysfunction is mediated by the suppression of actin polymerization after OGD/R. Furthermore, we demonstrate that I/R-induced upregulation of PTEN leads to the downregulation of SETD3, and suppressing PTEN protects against ischemic neuronal death through downregulation of SETD3 and enhancement of actin polymerization. Together, this study provides the first evidence suggesting that I/R-induced downregulation of SETD3 mediates PTEN upregulation-induced ischemic neuronal death through downregulation of SETD3 and subsequent suppression of actin polymerization. Thus, upregulating SETD3 is a potential approach for the development of ischemic stroke therapy.
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Acknowledgements
This work was supported by Shandong Provincial Natural Science Foundation (ZR2020MH282), Clinical Medicine +X grant of the Affiliated Hospital of Qingdao University (Grant Number: QDFY+X2019005) to Q.W.; National Natural Science Foundation of China (31900634) to Y.C.; this work was also supported by the National Key R&D Program of China (2019YFC0120000; 2018YFC1312300), the National Natural Science Foundation of China (NSFC: 82071385), and the Key Research and Development Project of Shandong (2019JZZY021010) to Q.W. We thank Qian Wen for the technical support and the service provided by the Institute of Neurodegeneration and Neurorehabilitation at Qingdao University.
Funding
This work was supported by Shandong Provincial Natural Science Foundation (ZR2020MH282), Clinical Medicine +X grant of the Affiliated Hospital of Qingdao University (Grant Number: QDFY+X2019005) to Q.W.; National Natural Science Foundation of China (31900634) to Y.C..; this work was also supported by National Key R&D Program of China (2019YFC0120000; 2018YFC1312300), the National Natural Science Foundation of China (NSFC: 82071385), and the Key Research and Development Project of Shandong (2019JZZY021010) to Q.W.
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Xiangyu Xu designed and performed most experiments, analyzed data, and prepared the manuscript; Yu Cui designed and performed some experiments, analyzed data, and prepared the manuscript. Congqin Li, Yuyang Wang, Jing Cheng, Songfeng Chen performed experiments and analyzed data; Jiangdong Sun, Jinyang Ren helped with MCAO model construction; Xujin Yao, Jingchen Gao, Xiaohong Huang collected and analyzed the data. All authors have read and approved the final manuscript. Qi Wan and Qiang Wang conceptualized the research, directed the study and prepared the manuscript.
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Fig. S1
Actin polymerization restored mitochondrial damage caused by SETD3 knockdown after OGD/R. (a) Flow cytometry analysis of mitochondrial potential by JC-1 staining of lentivirus-transfected neurons in the presence or absence of Jasplakinolide (2 μM). (b) ATP production was measured of lentivirus-transfected neurons in the presence or absence of Jasplakinolide (2 μM). (c) Flow cytometry analysis of intracellular ROS level by DCFH-DA staining of lentivirus-transfected neurons in the presence or absence of Jasplakinolide (2 μM). For a to c, neurons were first transfected with lentivirus for two days and then subjected to OGD/R for 1.5 h, Jasplakinolide was added 6 h after reoxygenation. All data are representative of or combined from at least three independent experiments (PNG 21480 kb)
Fig. S2
Quantification of mean fluorescence intensity of intracellular ROS level by DCFH-DA staining. (a, b) Quantification of mean fluorescence intensity (MFI) of intracellular ROS level by DCFH-DA staining of lentivirus-transfected neurons in Fig. 4 e (a) and f (b). (c) Quantification of MFI of intracellular ROS level by DCFH-DA staining of neurons-treated with 2 μM Jasplakinolide or vehicle in Fig. 5 e. (d) Quantification of MFI of intracellular ROS level by DCFH-DA staining of lentivirus-transfected neurons in the presence or absence of 2 μM Jasplakinolide in Figure 5 h. (e) Quantification of MFI of intracellular ROS level by DCFH-DA staining of lentivirus-transfected neurons in the presence or absence of Jasplakinolide (2 μM) in in Fig. S1. For Fig. S2 d to e, neurons were first transfected with lentivirus for two days and then subjected to OGD/R for 1.5 h, Jasplakinolide was added 6 h after reoxygenation. The data are means ± SD., *P < 0.05, **P < 0.01, ***P < 0.001 by one-way ANOVA analysis followed by Tukey post hoc test (a, d, e) or two-way ANOVA analysis followed by Bonferroni post hoc test (b, c) (PNG 21480 kb)
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Xu, X., Cui, Y., Li, C. et al. SETD3 Downregulation Mediates PTEN Upregulation-Induced Ischemic Neuronal Death Through Suppression of Actin Polymerization and Mitochondrial Function. Mol Neurobiol 58, 4906–4920 (2021). https://doi.org/10.1007/s12035-021-02459-x
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DOI: https://doi.org/10.1007/s12035-021-02459-x