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Song M, Yi F, Zeng F, Zheng L, Huang L, Sun X, Huang Q, Deng J, Wang H, Gu W. USP18 Stabilized FTO Protein to Activate Mitophagy in Ischemic Stroke Through Repressing m6A Modification of SIRT6. Mol Neurobiol 2024; 61:6658-6674. [PMID: 38340205 DOI: 10.1007/s12035-024-04001-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Accepted: 01/28/2024] [Indexed: 02/12/2024]
Abstract
Ischemic stroke (IS) is a dangerous cerebrovascular disorder with a significant incidence and death rate. Ubiquitin-specific peptidase 18 (USP18) has been proven to mitigate ischemic brain damage; however, its potential regulatory mechanisms remain unclear. In vivo and in vitro models of IS were established by middle cerebral artery occlusion (MCAO) and oxygen-glucose deprivation/reoxygenation (OGD/R). Neurocyte injury was detected by MTT, LDH, ROS level, mitochondrial membrane potential (Δψm), and flow cytometry. Molecular expression was evaluated by qPCR, Western blotting, and immunofluorescence staining. Molecular mechanisms were determined by Co-IP, RIP, and MeRIP. IS injury was determined by neurological behavior score and TTC staining. Mitophagy was observed by TEM. USP18 and fat mass and obesity-associated protein (FTO) expression declined after OGD/R. Dysfunctional mitochondrial and apoptosis in OGD/R-stimulated neurocytes were eliminated by USP18/FTO overexpression via mitophagy activation. USP18-mediated de-ubiquitination was responsible for increasing FTO protein stability. Up-regulation of FTO protein restrained m6A modification of sirtuin6 (SIRT6) in a YTHDF2-dependent manner to enhance SIRT6 expression and subsequent activation of AMPK/PGC-1α/AKT signaling. FTO induced mitophagy to ameliorate nerve cell damage through SIRT6/AMPK/PGC-1α/AKT pathway. Finally, USP18/FTO overexpression relieved IS in rats via triggering SIRT6/AMPK/PGC-1α/AKT axis-mediated mitophagy. USP18 increased FTO protein stability to trigger SIRT6-induced mitophagy, thus mitigating IS. Our data unravel the novel neuroprotective mechanism of USP18 and suggest its potential as a promising treatment target for IS.
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Affiliation(s)
- Mingyu Song
- Department of Neurology, Xiangya Hospital, Central South University, Hunan Province, Changsha, 410008, People's Republic of China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Hunan Province, Changsha, 410008, People's Republic of China
- Clinical Research Center for Cerebrovascular Disease of Hunan Province, Central South University, Hunan Province, No.87, Xiangya Road, Changsha, 410008, People's Republic of China
| | - Fang Yi
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Hunan Province, Changsha, 410008, People's Republic of China
- Department of Geriatric Neurology, Xiangya Hospital, Central South University, Hunan Province, Changsha, 410008, People's Republic of China
| | - Feiyue Zeng
- Department of Radiology, Xiangya Hospital, Central South University, Hunan Province, Changsha, 410008, People's Republic of China
| | - Lan Zheng
- Department of Neurology, Xiangya Hospital, Central South University, Hunan Province, Changsha, 410008, People's Republic of China
| | - Lei Huang
- Department of Neurological Rehabilitation, Hunan Provincial People's Hospital, The First Affiliated Hospital of Hunan Normal University, Hunan Province, Changsha, 410000, People's Republic of China
| | - Xinyu Sun
- Department of Neurology, Xiangya Hospital, Central South University, Hunan Province, Changsha, 410008, People's Republic of China
| | - Qianyi Huang
- Department of Neurology, Xiangya Hospital, Central South University, Hunan Province, Changsha, 410008, People's Republic of China
| | - Jun Deng
- Department of Neurology, Affiliated Hospital of Hunan Academy of Traditional Chinese Medicine, Hunan Province, Changsha, 410000, People's Republic of China
| | - Hong Wang
- Department of Geriatric Neurology, Xiangya Hospital, Central South University, Hunan Province, Changsha, 410008, People's Republic of China
| | - Wenping Gu
- Department of Neurology, Xiangya Hospital, Central South University, Hunan Province, Changsha, 410008, People's Republic of China.
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Hunan Province, Changsha, 410008, People's Republic of China.
- Clinical Research Center for Cerebrovascular Disease of Hunan Province, Central South University, Hunan Province, No.87, Xiangya Road, Changsha, 410008, People's Republic of China.
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Xie J, Zhang Z. Recent Advances and Therapeutic Implications of 2-Oxoglutarate-Dependent Dioxygenases in Ischemic Stroke. Mol Neurobiol 2024; 61:3949-3975. [PMID: 38041714 DOI: 10.1007/s12035-023-03790-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 11/08/2023] [Indexed: 12/03/2023]
Abstract
Ischemic stroke is a common disease with a high disability rate and mortality, which brings heavy pressure on families and medical insurance. Nowadays, the golden treatments for ischemic stroke in the acute phase mainly include endovascular therapy and intravenous thrombolysis. Some drugs are used to alleviate brain injury in patients with ischemic stroke, such as edaravone and 3-n-butylphthalide. However, no effective neuroprotective drug for ischemic stroke has been acknowledged. 2-Oxoglutarate-dependent dioxygenases (2OGDDs) are conserved and common dioxygenases whose activities depend on O2, Fe2+, and 2OG. Most 2OGDDs are expressed in the brain and are essential for the development and functions of the brain. Therefore, 2OGDDs likely play essential roles in ischemic brain injury. In this review, we briefly elucidate the functions of most 2OGDDs, particularly the effects of regulations of 2OGDDs on various cells in different phases after ischemic stroke. It would also provide promising potential therapeutic targets and directions of drug development for protecting the brain against ischemic injury and improving outcomes of ischemic stroke.
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Affiliation(s)
- Jian Xie
- Department of Neurology, Affiliated Zhongda Hospital, Research Institution of Neuropsychiatry, School of Medicine, Southeast University, Nanjing, 210009, Jiangsu, China
| | - Zhijun Zhang
- Department of Neurology, Affiliated Zhongda Hospital, Research Institution of Neuropsychiatry, School of Medicine, Southeast University, Nanjing, 210009, Jiangsu, China.
- Shenzhen Key Laboratory of Precision Diagnosis and Treatment of Depression, Department of Mental Health and Public Health, Faculty of Life and Health Sciences, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, Guangdong, China.
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Fang M, Yao J, Zhang H, Sun J, Yin Y, Shi H, Jiang G, Shi X. Specific deletion of Mettl3 in IECs triggers the development of spontaneous colitis and dysbiosis of T lymphocytes in mice. Clin Exp Immunol 2024; 217:57-77. [PMID: 38507548 PMCID: PMC11188546 DOI: 10.1093/cei/uxae025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 01/23/2024] [Accepted: 03/19/2024] [Indexed: 03/22/2024] Open
Abstract
The enzymatic core component of m6A writer complex, Mettl3, plays a crucial role in facilitating the development and progress of gastric and colorectal cancer (CRC). However, its underlying mechanism in regulating intestinal inflammation remains unclear and poorly investigated. First, the characteristics of Mettl3 expression in inflammatory bowel diseases (IBD) patients were examined. Afterward, we generated the mice line with intestinal epithelial cells (IECs)-specific deletion of Mettl3 verified by various experiments. We continuously recorded and compared the physiological status including survival rate etc. between the two groups. Subsequently, we took advantage of staining assays to analyze mucosal damage and immune infiltration of Mettl3WT and Mettl3KO primary IECs. Bulk RNA sequencing was used to pursuit the differential expression of genes (DEGs) and associated signaling pathways after losing Mettl3. Pyroptosis-related proteins were to determine whether cell death was caused by pyroptosis. Eventually, CyTOF was performed to probe the difference of CD45+ cells, especially CD3e+ T-cell clusters after losing Mettl3. In IBD patients, Mettl3 was highly expressed in the inner-nucleus of IECs while significantly decreased upon acute intestinal inflammation. IECs-specific deletion of Mettl3 KO mice triggered a wasting phenotype and developed spontaneous colitis. The survival rate, body weight, and intestinal length observed from 2 to 8 weeks of Mettl3KO mice were significantly lower than Mettl3WT mice. The degree of mucosal damage and immune infiltration in Mettl3KO were even more serious than in their WT littermate. Bulk RNA sequencing demonstrated that DEGs were dramatically enriched in NOD-signaling pathways due to the loss of Mettl3. The colonic epithelium was more prone to pyroptosis after losing Mettl3. Subsequently, CyTOF revealed that T cells have altered significantly in Mettl3KO. Furthermore, there was abnormal proliferation of CD4+ T and markedly exhaustion of CD8 + T in Mettl3KO mice. In severe IBD patients, Mettl3 is located in the inner-nucleus of IECs and declined when intestinal inflammation occurs. Subsequently, Mettl3 prevented mice from developing colitis.
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Affiliation(s)
- Miao Fang
- School of Medicine, Southeast University, Nanjing, PR China
| | - Jie Yao
- School of Medicine, Southeast University, Nanjing, PR China
- Department of General Surgery, Nantong Haimen People’s Hospital, Nantong, PR China
| | - Haifeng Zhang
- School of Medicine, Southeast University, Nanjing, PR China
| | - Jiahui Sun
- School of Public Health, Southeast University, Nanjing, PR China
| | - Yiping Yin
- School of Medicine, Southeast University, Nanjing, PR China
| | - Hongzhou Shi
- School of Medicine, Southeast University, Nanjing, PR China
| | | | - Xin Shi
- School of Medicine, Southeast University, Nanjing, PR China
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Chen H, Guo S, Li R, Yang L, Wang R, Jiang Y, Hao Y. YTHDF2-regulated matrilin-3 mitigates post-reperfusion hemorrhagic transformation in ischemic stroke via the PI3K/AKT pathway. J Neuropathol Exp Neurol 2024; 83:194-204. [PMID: 38230623 PMCID: PMC10880072 DOI: 10.1093/jnen/nlad102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2024] Open
Abstract
Hemorrhagic transformation can complicate ischemic strokes after recanalization treatment within a time window that requires early intervention. To determine potential therapeutic effects of matrilin-3, rat cerebral ischemia-reperfusion was produced using transient middle cerebral artery occlusion (tMCAO); intracranial hemorrhage and infarct volumes were assayed through hemoglobin determination and 2,3,5-triphenyltetrazoliumchloride (TTC) staining, respectively. Oxygen-glucose deprivation (OGD) modeling of ischemia was performed on C8-D1A cells. Interactions between matrilin-3 and YTH N6-methyladenosine RNA binding protein F2 (YTHDF2) were determined using RNA immunoprecipitation assay and actinomycin D treatment. Reperfusion after tMCAO modeling increased hemorrhage, hemoglobin content, and infarct volumes; these were alleviated by matrilin treatment. Matrilin-3 was expressed at low levels and YTHDF2 was expressed at high levels in ischemic brains. In OGD-induced cells, matrilin-3 was negatively regulated by YTHDF2. Matrilin-3 overexpression downregulated p-PI3K/PI3K, p-AKT/AKT, ZO-1, VE-cadherin and occludin, and upregulated p-JNK/JNK in ischemic rat brains; these effects were reversed by LY294002 (a PI3K inhibitor). YTHDF2 knockdown inactivated the PI3K/AKT pathway, inhibited inflammation and decreased blood-brain barrier-related protein levels in cells; these effects were reversed by matrilin-3 deficiency. These results indicate that YTHDF2-regulated matrilin-3 protected ischemic rats against post-reperfusion hemorrhagic transformation via the PI3K/AKT pathway and that matrilin may have therapeutic potential in ischemic stroke.
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Affiliation(s)
- Hanze Chen
- Department of Neurology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou City, Zhejiang Province, China
| | - Siping Guo
- Department of Neurology, Dushu Lake Hospital Affiliated to Soochow University, Suzhou City, Jiangsu Province, China
| | - Runnan Li
- Department of Neurology, Dushu Lake Hospital Affiliated to Soochow University, Suzhou City, Jiangsu Province, China
| | - Lihui Yang
- Department of Neurology, Dushu Lake Hospital Affiliated to Soochow University, Suzhou City, Jiangsu Province, China
| | - Rui Wang
- Department of Neurology, Dushu Lake Hospital Affiliated to Soochow University, Suzhou City, Jiangsu Province, China
| | - Yasi Jiang
- Department of Neurology, Dushu Lake Hospital Affiliated to Soochow University, Suzhou City, Jiangsu Province, China
| | - Yonggang Hao
- Department of Neurology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou City, Zhejiang Province, China
- Department of Neurology, Dushu Lake Hospital Affiliated to Soochow University, Suzhou City, Jiangsu Province, China
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Liang T, Zhu L, Yang J, Huang X, Lv M, Liu S, Wen Z, Su L, Zhou L. Identification of Key Genes Mediated by N6-Methyladenosine Methyltransferase METTL3 in Ischemic Stroke via Bioinformatics Analysis and Experiments. Mol Biotechnol 2023:10.1007/s12033-023-00991-w. [PMID: 38135832 DOI: 10.1007/s12033-023-00991-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 11/13/2023] [Indexed: 12/24/2023]
Abstract
The N6-methyladenosine (m6A) methyltransferase METTL3 has been demonstrated to function in mediating m6A modification, but its role in ischemic stroke (IS) has not been fully elucidated. This study aimed to explore the downstream mechanism of METTL3-mediated m6A modification in IS. GSE16561 and GSE22255 were downloaded from the Gene Expression Omnibus database for analysis of differentially expressed genes (DEGs), and it was found that METTL3 mRNA was downregulated in IS. Then quantitative real-time polymerase chain reaction was used to verify the downregulation of METTL3 mRNA in the peripheral blood of IS patients and the cortexes of transient middle cerebral artery occlusion mice. By combining DEGs with the m6A-downregulated genes in GSE142386 which performed methylated RNA immunoprecipitation sequencing (MeRIP-seq) on METTL3-deficient and control endothelial cells, a total of 131 genes were identified as the METTL3-mediated m6A-modified genes in IS. Kyoto Encyclopedia of Genes and Genomes pathway enrichment analysis showed that the genes were mainly involved in cytokine-cytokine receptor interaction, MAPK signaling pathway and NF-kappa B signaling pathway. CTSS and SBK1 were further screened as the key METTL3-mediated m6A-modified genes by random forest model and PCR validation. The ROC curve analysis showed that the combination with CTSS and SBK1 was of good diagnostic value for IS, with the AUC of 0.810, sensitivity of 0.780, and specificity of 0.773. Overall, we found that METTL3-mediated m6A modification may influence the occurrence and development of IS by participating in inflammation-related biological processes, and two key m6A-modified genes mediated by METTL3 (CTSS and SBK1) can be used as diagnostic biomarkers for IS.
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Affiliation(s)
- Tian Liang
- School of Public Health of Guangxi Medical University, 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Lulu Zhu
- School of Public Health of Guangxi Medical University, 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Jialei Yang
- School of Public Health of Guangxi Medical University, 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Xiaolan Huang
- School of Public Health of Guangxi Medical University, 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Miao Lv
- School of Public Health of Guangxi Medical University, 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Shengying Liu
- School of Public Health of Guangxi Medical University, 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Zheng Wen
- School of Public Health of Guangxi Medical University, 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Li Su
- School of Public Health of Guangxi Medical University, 22 Shuangyong Road, Nanning, 530021, Guangxi, China.
| | - Lifang Zhou
- Liuzhou Center for Disease Control and Prevention, Liuzhou, 545005, Guangxi, China.
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Yang J, Shangguan Q, Xie G, Yang M, Sheng G. M6A regulator methylation patterns and characteristics of immunity in acute ST-segment elevation myocardial infarction. Sci Rep 2023; 13:15688. [PMID: 37735234 PMCID: PMC10514189 DOI: 10.1038/s41598-023-42959-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 09/16/2023] [Indexed: 09/23/2023] Open
Abstract
M6A methylation is the most prevalent and abundant RNA modification in mammals. Although there are many studies on the regulatory role of m6A methylation in the immune response, the m6A regulators in the pathogenesis of acute ST-segment elevation myocardial infarction (STEMI) remain unclear. We comprehensively analysed the role of m6A regulators in STEMI and built a predictive model, revealing the relationship between m6A methylations and the immune microenvironment. Differential analysis revealed that 18 of 24 m6A regulators were significantly differentially expressed, and there were substantial interactions between the m6A regulator. Then, we established a classifier and nomogram model based on 6 m6A regulators, which can easily distinguish the STEMI and control samples. Finally, two distinct m6A subtypes were obtained and significantly differentially expressed in terms of infiltrating immunocyte abundance, immune reaction activity and human leukocyte antigen genes. Three hub m6A phenotype related genes (RAC2, RELA, and WAS) in the midnightblue module were identified by weighted gene coexpression network analysis, and were associated with immunity. These findings suggest that m6A modification and the immune microenvironment play a key role in the pathogenesis of STEMI.
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Affiliation(s)
- Jingqi Yang
- Department of Cardiovascular Medicine, Jiangxi Provincial People's Hospital, The First Affiliated Hospital of Nanchang Medical College, 152 Aiguo Road, Nanchang, China
| | - Qing Shangguan
- Department of Cardiovascular Medicine, Jiangxi Provincial People's Hospital, The First Affiliated Hospital of Nanchang Medical College, 152 Aiguo Road, Nanchang, China
| | - Guobo Xie
- Department of Cardiovascular Medicine, Jiangxi Provincial People's Hospital, The First Affiliated Hospital of Nanchang Medical College, 152 Aiguo Road, Nanchang, China
| | - Ming Yang
- Department of Cardiovascular Medicine, Jiangxi Provincial People's Hospital, The First Affiliated Hospital of Nanchang Medical College, 152 Aiguo Road, Nanchang, China.
| | - Guotai Sheng
- Department of Cardiovascular Medicine, Jiangxi Provincial People's Hospital, The First Affiliated Hospital of Nanchang Medical College, 152 Aiguo Road, Nanchang, China
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