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Li F, Wang F, Wang L, Wang J, Wei S, Meng J, Li Y, Feng L, Jiang P. m6A reader YTHDC2 mediates NCOA4 mRNA stability affecting ferritinophagy to alleviate secondary injury after intracerebral haemorrhage. Epigenetics 2024; 19:2326868. [PMID: 38465865 PMCID: PMC10936596 DOI: 10.1080/15592294.2024.2326868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 03/01/2024] [Indexed: 03/12/2024] Open
Abstract
Oxidative stress and neuronal dysfunction caused by intracerebral haemorrhage (ICH) can lead to secondary injury. The m6A modification has been implicated in the progression of ICH. This study aimed to investigate the role of the m6A reader YTHDC2 in ICH-induced secondary injury. ICH models were established in rats using autologous blood injection, and neuronal cell models were induced with Hemin. Experiments were conducted to overexpress YTH domain containing 2 (YTHDC2) and examine its effects on neuronal dysfunction, brain injury, and neuronal ferritinophagy. RIP-qPCR and METTL3 silencing were performed to investigate the regulation of YTHDC2 on nuclear receptor coactivator 4 (NCOA4). Finally, NCOA4 overexpression was used to validate the regulatory mechanism of YTHDC2 in ICH. The study found that YTHDC2 expression was significantly downregulated in the brain tissues of ICH rats. However, YTHDC2 overexpression improved neuronal dysfunction and reduced brain water content and neuronal death after ICH. Additionally, it reduced levels of ROS, NCOA4, PTGS2, and ATG5 in the brain tissues of ICH rats, while increasing levels of FTH and FTL. YTHDC2 overexpression also decreased levels of MDA and Fe2+ in the serum, while promoting GSH synthesis. In neuronal cells, YTHDC2 overexpression alleviated Hemin-induced injury, which was reversed by Erastin. Mechanistically, YTHDC2-mediated m6A modification destabilized NCOA4 mRNA, thereby reducing ferritinophagy and alleviating secondary injury after ICH. However, the effects of YTHDC2 were counteracted by NCOA4 overexpression. Overall, YTHDC2 plays a protective role in ICH-induced secondary injury by regulating NCOA4-mediated ferritinophagy.
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Affiliation(s)
- Fengfeng Li
- Department of Neurosurgery, Tengzhou Central People’s Hospital, Jining Medical University, Tengzhou, China
| | - Fang Wang
- Translational Pharmaceutical Laboratory, Jining First People’s Hospital, Shandong First Medical University, Jining, China
- Institute of Translational Pharmacy, Jining Medical Research Academy, Jining, China
| | - Lei Wang
- Translational Pharmaceutical Laboratory, Jining First People’s Hospital, Shandong First Medical University, Jining, China
- Institute of Translational Pharmacy, Jining Medical Research Academy, Jining, China
| | - Jianhua Wang
- Translational Pharmaceutical Laboratory, Jining First People’s Hospital, Shandong First Medical University, Jining, China
- Institute of Translational Pharmacy, Jining Medical Research Academy, Jining, China
| | - Shanshan Wei
- Department of Pharmacy, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
| | - Junjun Meng
- Translational Pharmaceutical Laboratory, Jining First People’s Hospital, Shandong First Medical University, Jining, China
- Institute of Translational Pharmacy, Jining Medical Research Academy, Jining, China
| | - Yanan Li
- Translational Pharmaceutical Laboratory, Jining First People’s Hospital, Shandong First Medical University, Jining, China
- Institute of Translational Pharmacy, Jining Medical Research Academy, Jining, China
| | - Lei Feng
- Department of Neurosurgery, Jining First People’s Hospital, Shandong First Medical University, Jining, China
| | - Pei Jiang
- Translational Pharmaceutical Laboratory, Jining First People’s Hospital, Shandong First Medical University, Jining, China
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Yao L, Peng P, Ding T, Yi J, Liang J. m 6A-Induced lncRNA MEG3 Promotes Cerebral Ischemia-Reperfusion Injury Via Modulating Oxidative Stress and Mitochondrial Dysfunction by hnRNPA1/Sirt2 Axis. Mol Neurobiol 2024:10.1007/s12035-024-04005-x. [PMID: 38358439 DOI: 10.1007/s12035-024-04005-x] [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: 08/07/2023] [Accepted: 01/31/2024] [Indexed: 02/16/2024]
Abstract
Ischemic stroke remains one of the major causes of serious disability and death globally. LncRNA maternally expressed gene 3 (MEG3) is elevated in middle cerebral artery occlusion/reperfusion (MCAO/R) rats and oxygen-glucose deprivation/reperfusion (OGD/R)-treated neurocytes cells. The objective of this study is to investigate the mechanism underlying MEG3-regulated cerebral ischemia/reperfusion (I/R) injury. MCAO/R mouse model and OGD/R-treated HT-22 cell model were established. The cerebral I/R injury was monitored by TTC staining, neurological scoring, H&E and TUNEL assay. The levels of MEG3, hnRNPA1, Sirt2 and other key molecules were detected by qRT-PCR and western blot. Mitochondrial dysfunction was assessed by transmission Electron Microscopy (TEM), JC-1 and MitoTracker staining. Oxidative stress was monitored using commercial kits. Bioinformatics analysis, RIP, RNA pull-down assays and RNA FISH were employed to detect the interactions among MEG3, hnRNPA1 and Sirt2. The m6A modification of MEG3 was assessed by MeRIP-qPCR. MEG3 promoted MCAO/R-induced brain injury by modulating mitochondrial fragmentation and oxidative stress. It also facilitated OGD/R-induced apoptosis, mitochondrial dysfunction and oxidative stress in HT-22 cells. Mechanistically, direct associations between MEG3 and hnRNPA1, as well as between hnRNPA1 and Sirt2, were observed in HT-22 cells. MEG3 regulated Sirt2 expression in a hnRNPA1-dependent manner. Functional studies showed that MEG3/Sirt2 axis contributed to OGD/R-induced mitochondrial dysfunction and oxidative stress in HT-22 cells. Additionally, METTL3 was identified as the m6A transferase responsible for the m6A modification of MEG3. m6A-induced lncRNA MEG3 promoted cerebral I/R injury via modulating oxidative stress and mitochondrial dysfunction by hnRNPA1/Sirt2 axis.
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Affiliation(s)
- Ling Yao
- Department of Neurosurgery, Changde Hospital, Xiangya School of Medicine, Central South University (The First People's Hospital of Changde City), No.818 Renmin Road, Changde, Hunan Province, 415000, P.R. China
| | - Pei Peng
- Department of Medicine Oncology, Changde Hospital, Xiangya School of Medicine, Central South University (The First People's Hospital of Changde City), Changde, Hunan Province, 415000, P.R. China
| | - Tao Ding
- Department of Neurology, Changde Hospital, Xiangya School of Medicine, Central South University (The First People's Hospital of Changde City), No.818 Renmin Road, Changde, Hunan Province, 415000, P.R. China
| | - Jing Yi
- Department of Neurology, Changde Hospital, Xiangya School of Medicine, Central South University (The First People's Hospital of Changde City), No.818 Renmin Road, Changde, Hunan Province, 415000, P.R. China
| | - Ji Liang
- Department of Neurology, Changde Hospital, Xiangya School of Medicine, Central South University (The First People's Hospital of Changde City), No.818 Renmin Road, Changde, Hunan Province, 415000, P.R. China.
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Yan H, Huang W, Rao J, Yan D, Yuan J. Demethylase FTO-Mediated m6A Modification of lncRNA MEG3 Activates Neuronal Pyroptosis via NLRP3 Signaling in Cerebral Ischemic Stroke. Mol Neurobiol 2024; 61:1023-1043. [PMID: 37676392 DOI: 10.1007/s12035-023-03622-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 08/29/2023] [Indexed: 09/08/2023]
Abstract
Neuronal death following ischemia is the primary cause of death and disability in patients with ischemic stroke. N6-methyladenosine (m6A) modification plays essential role in various physiological and pathological conditions, but its role and mechanism in ischemic neuronal death remain unclear. In the present study, neuronal pyroptosis was an important event in brain injury caused by ischemic stroke, and the upregulation of long non-coding RNA (lncRNA) maternally expressed gene 3 (MEG3) following cerebral ischemia was a key factor in activating ischemic neuronal pyroptosis via NLRP3/caspase-1/GSDMD signaling. Moreover, we first demonstrated that the demethylase fat mass and obesity-associated protein (FTO), which was decreased following ischemia, regulated MEG3 expression in an m6A-dependent manner by affecting its stability, thereby activating neuronal pyroptosis via NLRP3/caspase-1/GSDMD signaling, and ultimately leading to ischemic brain damage. Therefore, the present study provides new insights for the mechanism of ischemic stroke, and suggests that FTO may be a potential therapeutic target for ischemic stroke.
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Affiliation(s)
- Honglin Yan
- Department of Pathology, Renmin Hospital of Wuhan University, Wuhan, Hubei, 430060, People's Republic of China
| | - Wenxian Huang
- Department of Pathology, Renmin Hospital of Wuhan University, Wuhan, Hubei, 430060, People's Republic of China
| | - Jie Rao
- Department of Pathology, Renmin Hospital of Wuhan University, Wuhan, Hubei, 430060, People's Republic of China
| | - Dandan Yan
- Department of Pathology, Renmin Hospital of Wuhan University, Wuhan, Hubei, 430060, People's Republic of China
| | - Jingping Yuan
- Department of Pathology, Renmin Hospital of Wuhan University, Wuhan, Hubei, 430060, People's Republic of China.
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Wu H, Chen S, Hu Z, Ge R, Ma L, You C, Huang Y. Exploring the prognostic potential of m6A methylation regulators in low-grade glioma: implications for tumor microenvironment modulation. Eur J Med Res 2024; 29:19. [PMID: 38173044 PMCID: PMC10763210 DOI: 10.1186/s40001-023-01621-6] [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: 11/20/2023] [Accepted: 12/25/2023] [Indexed: 01/05/2024] Open
Abstract
BACKGROUND The biological behavior of low-grade glioma (LGG) is significantly affected by N6-methyladenosine (m6A) methylation, an essential epigenetic alteration. Therefore, it is crucial to create a prognostic model for LGG by utilizing genes that regulate m6A methylation. METHODS Using TCGA and GTEx databases. We examined m6A modulator levels in LGG and normal tissues, and investigated PD-L1 and PD-1 expression, immune scores, immune cell infiltration, tumor immune microenvironment (TIME) and potential underlying mechanisms in different LGG clusters. We also performed immunohistochemistry and RT-qPCR to identify essential m6A adjustment factor. RESULTS The results showed that m6A regulatory element expression was significantly increased in LGG tissues and was significantly associated with TMIE. A substantial increase in PD-L1 and PD-1 levels in LGG tissues and high-risk cohorts was observed. PD-L1 expression was positively correlated with FTO, ZCCHC4, and HNRNPD, whereas PD-1 expression was negatively correlated with FTO, ZC3H7B, and HNRNPD. The prognostic signature created using regulators of m6A RNA methylation was shown to be strongly associated with the overall survival of LGG patients, and FTO and ZCCHC4 were confirmed as independent prognostic markers by clinical samples. Furthermore, the results revealed different TIME characteristics between the two groups of patients, indicating disrupted signaling pathways associated with LGG. CONCLUSION Our results present that the m6A regulators play vital role in regulating PD-L1/PD-1 expression and the infiltration of immune cells, thereby exerting a sizable impact on the TIME of LGG. Therefore, m6A regulators have precise predictive value in the prognosis of LGG.
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Affiliation(s)
- Honggang Wu
- Department of Neurosurgery, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China
- Department of Cerebrovascular Disease, The People's Hospital of Leshan, Leshan, 614000, Sichuan, China
| | - Siqi Chen
- Department of Neurosurgery, The First Affiliated Hospital of Ningbo University, No. 59, Liuting Street, Ningbo, 315010, Zhejiang, China
| | - Ziliang Hu
- Department of Neurosurgery, The First Affiliated Hospital of Ningbo University, No. 59, Liuting Street, Ningbo, 315010, Zhejiang, China
| | - Rong Ge
- Ningbo Clinical Pathology Diagnosis Center, Ningbo, 315021, China
| | - Lu Ma
- Department of Neurosurgery, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China
| | - Chao You
- Department of Neurosurgery, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China.
| | - Yi Huang
- Department of Neurosurgery, The First Affiliated Hospital of Ningbo University, No. 59, Liuting Street, Ningbo, 315010, Zhejiang, China.
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Zhou J, Liao S, Zhang C, Luo J, Li G, Li H. Expression profiling of N6-methyladenosine-modified mRNA in PC12 cells in response to unconjugated bilirubin. Mol Biol Rep 2023; 50:6703-6715. [PMID: 37378749 PMCID: PMC10374823 DOI: 10.1007/s11033-023-08576-1] [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: 02/17/2023] [Accepted: 06/02/2023] [Indexed: 06/29/2023]
Abstract
BACKGROUND Abnormal methylation of N6-methyladenosine (m6A) is reportedly associated with central nervous system disorders. However, the role of m6A mRNA methylation in unconjugated bilirubin (UCB) neurotoxicity requires further research. METHODS Rat pheochromocytoma PC12 cells treated with UCB were used as in vitro models. After the PC12 cells were treated with UCB (0, 12, 18, and 24 µM) for 24 h, the total RNA m6A levels were measured using an m6A RNA methylation quantification kit. The expression of m6A demethylases and methyltransferases was detected through western blotting. We determined the m6A mRNA methylation profile in PC12 cells exposed to UCB (0 and 18 µM) for 24 h using methylated RNA immunoprecipitation sequencing (MeRIP-seq). RESULTS Compared with the control group, UCB (18 and 24 µM) treatment decreased the expression of the m6A demethylase ALKBH5 and increased the expression of the methyltransferases METTL3 and METTL14, which resulted in an increase in the total m6A levels in PC12 cells. Furthermore, 1533 m6A peaks were significantly elevated and 1331 peaks were reduced in the UCB (18 µM)-treated groups compared with those in the control group. Genes with differential m6A peaks were mainly enriched in protein processing in the endoplasmic reticulum, ubiquitin-mediated proteolysis, cell cycle, and endocytosis. Through combined analysis of the MeRIP-seq and RNA sequencing data, 129 genes with differentially methylated m6A peaks and differentially expressed mRNA levels were identified. CONCLUSION Our study suggests that the modulation of m6A methylation modifications plays a significant role in UCB neurotoxicity.
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Affiliation(s)
- Jinfu Zhou
- Department of Preventive Medicine, School of Public Health, Fujian Medical University, Fuzhou, 350122, Fujian Province, China
- Medical Genetic Diagnosis and Therapy Center, Fujian Maternity and Child Health Hospital College of Clinical Medicine for Obstetrics & Gynecology and Pediatrics, Fujian Medical University, Fuzhou, 350001, Fujian Province, China
| | - Sining Liao
- Department of Preventive Medicine, School of Public Health, Fujian Medical University, Fuzhou, 350122, Fujian Province, China
- Fujian Provincial Key Laboratory of Environmental Factors and Cancer, School of Public Health, Fujian Medical University, Fuzhou, 350122, Fujian Province, China
| | - Chenran Zhang
- Department of Preventive Medicine, School of Public Health, Fujian Medical University, Fuzhou, 350122, Fujian Province, China
- Fujian Provincial Key Laboratory of Environmental Factors and Cancer, School of Public Health, Fujian Medical University, Fuzhou, 350122, Fujian Province, China
| | - Jinying Luo
- Obstetrics and Gynecology Department, Fujian Maternity and Child Health Hospital College of Clinical Medicine for Obstetrics & Gynecology and Pediatrics, Fujian Medical University, Fuzhou, 350001, Fujian Province, China
| | - Guilin Li
- Department of Preventive Medicine, School of Public Health, Fujian Medical University, Fuzhou, 350122, Fujian Province, China
- Fujian Provincial Key Laboratory of Environmental Factors and Cancer, School of Public Health, Fujian Medical University, Fuzhou, 350122, Fujian Province, China
| | - Huangyuan Li
- Department of Preventive Medicine, School of Public Health, Fujian Medical University, Fuzhou, 350122, Fujian Province, China.
- Fujian Provincial Key Laboratory of Environmental Factors and Cancer, School of Public Health, Fujian Medical University, Fuzhou, 350122, Fujian Province, China.
- Key Laboratory of Environment and Health, School of Public Health, Fujian Medical University, Fuzhou, 350122, Fujian Province, China.
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Wang X, Botchway BOA, Zhang Y, Huang M, Liu X. Maresin1 can be a potential therapeutic target for nerve injury. Biomed Pharmacother 2023; 161:114466. [PMID: 36870281 DOI: 10.1016/j.biopha.2023.114466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 02/26/2023] [Accepted: 02/28/2023] [Indexed: 03/06/2023] Open
Abstract
Nerve injury significantly affects human motor and sensory function due to destruction of the integrity of nerve structure. In the wake of nerve injury, glial cells are activated, and synaptic integrity is destroyed, causing inflammation and pain hypersensitivity. Maresin1, an omega-3 fatty acid, is a derivative of docosahexaenoic acid. It has showed beneficial effects in several animal models of central and peripheral nerve injuries. In this review, we summarize the anti-inflammatory, neuroprotective and pain hypersensitivity effects of maresin1 in nerve injury and provide a theoretical basis for the clinical treatment of nerve injury using maresin1.
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Affiliation(s)
- Xichen Wang
- Department of Histology and Embryology, School of Medicine, Shaoxing University, Zhejiang, China
| | - Benson O A Botchway
- Institute of Neuroscience, Zhejiang University School of Medicine, Hangzhou, China; Bupa Cromwell Hospital, London, UK
| | - Yong Zhang
- Department of Histology and Embryology, School of Medicine, Shaoxing University, Zhejiang, China
| | - Min Huang
- Department of Histology and Embryology, School of Medicine, Shaoxing University, Zhejiang, China
| | - Xuehong Liu
- Department of Histology and Embryology, School of Medicine, Shaoxing University, Zhejiang, China.
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Luo Y, Chen J, Cui Y, Fang F, Zhang Z, Hu L, Chen X, Li Z, Li L, Chen L. Transcriptome-wide high-throughput m 6 A sequencing of differential m 6 A methylation patterns in the decidual tissues from RSA patients. FASEB J 2023; 37:e22802. [PMID: 36786696 DOI: 10.1096/fj.202201232rrrr] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 01/04/2023] [Accepted: 01/23/2023] [Indexed: 02/15/2023]
Abstract
Recurrent spontaneous abortion (RSA) is characterized by two or more consecutive pregnancy losses in the first trimester of pregnancy, experienced by 5% of women during their reproductive age. As a complex pathological process, the etiology of RSA remains poorly understood. Recent studies have established that gene expression changes dramatically in human endometrial stromal cells (ESCs) during decidualization. N6-methyladenosine (m6 A) modification is the most prevalent epigenetic modification of mRNA in eukaryotic cells and it is closely related to the occurrence and development of many pathophysiological phenomena. In this study, we first confirmed that high levels of m6 A mRNA methylation in decidual tissues are associated with RSA. Then, we used m6 A-modified RNA immunoprecipitation sequence (m6 A-seq) and RNA sequence (RNA-seq) to identify the differentially expressed m6 A methylation in decidual tissues from RSA patients and identified the key genes involved in abnormal decidualization by bioinformatics analysis. Using m6 A-seq, we identified a total of 2169 genes with differentially expressed m6 A methylation, of which 735 m6 A hypermethylated genes and 1434 m6 A hypomethylated genes were identified. Further joint analysis of m6 A-seq and RNA-seq revealed that 133 genes were m6 A modified with mRNA expression. GO and KEGG analyses indicated that these unique genes were mainly enriched in environmental information processing pathways, including the cytokine-cytokine receptor interaction and PI3K-Akt signaling pathway. In summary, this study uncovered the transcriptome-wide m6 A modification pattern in decidual tissue of RSA, which provides a theoretical basis for further research into m6 A modification and new therapeutic strategies for RSA.
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Affiliation(s)
- Yong Luo
- Department of Pharmacology, School of Basic Medical Sciences, Health Science Center, Xi'an Jiaotong University, Xi'an, China.,Central Laboratory, Jiangxi Provincial Maternal and Child Health Hospital, Nanchang, China
| | - Jin Chen
- Department of Traditional Chinese Medicine, Jiangxi Provincial Maternal and Child Health Hospital, Nanchang, China
| | - Ying Cui
- Department of Traditional Chinese Medicine, Jiangxi Provincial Maternal and Child Health Hospital, Nanchang, China
| | - Fang Fang
- Department of Traditional Chinese Medicine, Jiangxi Provincial Maternal and Child Health Hospital, Nanchang, China
| | - Ziyu Zhang
- Department of Pathology, Jiangxi Provincial Maternal and Child Health Hospital, Nanchang, China
| | - Lili Hu
- Ambulatory Surgery Center, Jiangxi Provincial Maternal and Child Health Hospital, Nanchang, China
| | - Xiaoyong Chen
- Department of Traditional Chinese Medicine, Jiangxi Provincial Maternal and Child Health Hospital, Nanchang, China
| | - Zengming Li
- Department of Pharmacology, School of Basic Medical Sciences, Health Science Center, Xi'an Jiaotong University, Xi'an, China.,Central Laboratory, Jiangxi Provincial Maternal and Child Health Hospital, Nanchang, China
| | - Liping Li
- Prenatal Diagnosis Center, Key Laboratory of Women's Reproductive Health of Jiangxi Province, Jiangxi Provincial Maternal and Child Health Hospital, Nanchang, China
| | - Lina Chen
- Department of Pharmacology, School of Basic Medical Sciences, Health Science Center, Xi'an Jiaotong University, Xi'an, China.,Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi'an Jiaotong University, Xi'an, China
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8
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Chokkalla AK, Jeong S, Mehta SL, Davis CK, Morris-Blanco KC, Bathula S, Qureshi SS, Vemuganti R. Cerebroprotective Role of N6-Methyladenosine Demethylase FTO (Fat Mass and Obesity-Associated Protein) After Experimental Stroke. Stroke 2023; 54:245-254. [PMID: 36321453 PMCID: PMC10250008 DOI: 10.1161/strokeaha.122.040401] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 09/30/2022] [Indexed: 11/07/2022]
Abstract
BACKGROUND FTO (fat mass and obesity-associated protein) demethylates N6-methyladenosine (m6A), which is a critical epitranscriptomic regulator of neuronal function. We previously reported that ischemic stroke induces m6A hypermethylation with a simultaneous decrease in FTO expression in neurons. Currently, we evaluated the functional significance of restoring FTO with an adeno-associated virus 9, and thus reducing m6A methylation in poststroke brain damage. METHODS Adult male and female C57BL/6J mice were injected with FTO adeno-associated virus 9 (intracerebral) at 21 days prior to inducing transient middle cerebral artery occlusion. Poststroke brain damage (infarction, atrophy, and white matter integrity) and neurobehavioral deficits (motor function, cognition, depression, and anxiety-like behaviors) were evaluated between days 1 and 28 of reperfusion. RESULTS FTO overexpression significantly decreased the poststroke m6A hypermethylation. More importantly, exogenous FTO substantially decreased poststroke gray and white matter damage and improved motor function recovery, cognition, and depression-like behavior in both sexes. CONCLUSIONS These results demonstrate that FTO-dependent m6A demethylation minimizes long-term sequelae of stroke independent of sex.
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Affiliation(s)
- Anil K Chokkalla
- Department of Neurological Surgery, University of Wisconsin, Madison, WI, USA
| | - Soomin Jeong
- Department of Neurological Surgery, University of Wisconsin, Madison, WI, USA
- Neuroscience Training Program, University of Wisconsin, Madison, WI, USA
| | - Suresh L Mehta
- Department of Neurological Surgery, University of Wisconsin, Madison, WI, USA
| | - Charles K Davis
- Department of Neurological Surgery, University of Wisconsin, Madison, WI, USA
| | | | | | - Simran S Qureshi
- Department of Neurological Surgery, University of Wisconsin, Madison, WI, USA
| | - Raghu Vemuganti
- Department of Neurological Surgery, University of Wisconsin, Madison, WI, USA
- Neuroscience Training Program, University of Wisconsin, Madison, WI, USA
- William S. Middleton Memorial Veteran Administration Hospital, Madison, WI, USA
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Downregulation of METTL14 improves postmenopausal osteoporosis via IGF2BP1 dependent posttranscriptional silencing of SMAD1. Cell Death Dis 2022; 13:919. [PMID: 36319624 PMCID: PMC9626483 DOI: 10.1038/s41419-022-05362-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Revised: 09/19/2022] [Accepted: 10/20/2022] [Indexed: 11/21/2022]
Abstract
Osteoporosis (OP) tends to occur in postmenopausal women, making them prone to fractures. N6-methyladenosine (m6A) methylation plays a crucial role in OP. Herein, we aimed to explore the effects of METTL14 on osteogenesis and the underlying mechanism. Osteogenic differentiation was assessed through osteoblast markers expression, cell proliferation, ALP activity, and mineralization, which were detected by qRT-PCR, CCK-8, EdU assay, ALP staining assay, and ARS staining assay, respectively. Osteoporosis was evaluated in OVX mice using qRT-PCR, microcomputed tomography, and H&E staining assay. The levels of METTL14 and SMAD1 were measured using qRT-PCR and western blot, and their interaction was assessed using RIP and luciferase reporter assay. M6A methylation was analyzed using the Me-RIP assay. The results indicated that m6A, METTL14, and SMAD1 levels were downregulated in patients with OP and OVX mice, and upregulated in osteogenic BMSCs. Knockdown of METTL14 suppressed osteogenesis of BMSCs and reduced bone mass of OVX mice. Moreover, silencing of METTL14 positively related to SMAD1 and inhibited m6A modification of SMAD1 by suppressing its stability. IGF2BP1 was identified as the methylation reader, and which knockdown reversed the upregulation induced by SMAD1. Overexpression of SMAD1 reversed the suppression of osteogenic differentiation induced by METTL14 knockdown. In conclusion, interference with METTL14 inhibited osteogenic differentiation of BSMCs by m6A modification of SMAD1 in an IGFBP1 manner, suggesting that METTL14 might be a novel approach for improving osteoporosis.
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Wan L, Liu J, Huang C, Zhu Z, Wang K, Sun G, Zhu L, Hu Z. Comprehensive Analysis and Functional Characteristics of Differential Expression of N6-Methyladenosine Methylation Modification in the Whole Transcriptome of Rheumatoid Arthritis. Mediators Inflamm 2022; 2022:4766992. [PMID: 36330380 PMCID: PMC9626244 DOI: 10.1155/2022/4766992] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Accepted: 09/22/2022] [Indexed: 08/04/2023] Open
Abstract
N6-methyladenosine (m6A) modification is the most prevalent chemical modification in eukaryotic mRNA and is associated with the development of various immune diseases. However, the role of m6A methylation in rheumatoid arthritis (RA) development is unclear. We preliminarily explored the role of m6A methylation-related mRNAs in RA for its clinical application. The discovery of m6A methylation-modifying genes in this study may provide a fresh perspective on the development of drugs for RA treatment. High-throughput sequencing combined with methylated RNA immunoprecipitation (MeRIP-seq) and RNA sequencing were used to assess whole-transcriptome m6A modifications in the synovium of patients with RA. The relationship between m6A-modified target genes and RA inflammation and macrophages was determined. The expression of the m6A-modified significant transcript-enriched inflammatory signaling pathway was assessed through animal experiments. Differentially expressed m6A genes were correlated with macrophage activation involved in immune response, vascular endothelium, MAPK signaling pathway, PI3K - Akt signaling pathway, and other inflammatory processes. Furthermore, combined analysis with m6A-seq and RNA-seq revealed 120 genes with significant changes in both m6A modification and mRNA expression. We selected the top 3 candidate mRNAs that were upregulated and downregulated simultaneously. The expression of phosphatase and tensin homolog deleted on chromosome ten (PTEN) mRNA and protein in RA patients was lower than that in healthy control (HC). SHC-binding protein 1 (SHCBP1) and neurexophilin-3 (NXPH3) mRNA expressions were increased in RA patients. The expression of M1 macrophages was increased in RA patients. RA markers are such as rheumatoid factor (RF) and peptide containing citrulline (CCP). Further animal experiments showed that the expression of synovial MAPK, PI3K, and Akt1 proteins in the RA model was increased, and the PTEN, p-PTEN protein expression was decreased. PI3K, Akt1, PTEN, and p-PTEN were correlated to RA joint inflammation. This study revealed a unique pattern of differential m6A methylation modifications in RA and concluded that m6A modification is related to the occurrence of RA synovial inflammation.
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Affiliation(s)
- Lei Wan
- The First Affiliated Hospital of Anhui University of Chinese Medicine, Hefei 230038, China
- Key Laboratory of Xin'an Medical Education Ministry, Hefei 230038, China
| | - Jian Liu
- The First Affiliated Hospital of Anhui University of Chinese Medicine, Hefei 230038, China
- Key Laboratory of Xin'an Medical Education Ministry, Hefei 230038, China
| | - Chuanbing Huang
- The First Affiliated Hospital of Anhui University of Chinese Medicine, Hefei 230038, China
| | - Ziheng Zhu
- The First Affiliated Hospital of Anhui University of Chinese Medicine, Hefei 230038, China
| | - Kun Wang
- Key Laboratory of Xin'an Medical Education Ministry, Hefei 230038, China
- College of Traditional Chinese Medicine, Anhui University of Chinese Medicine, Hefei 230012, China
| | - Guanghan Sun
- College of Traditional Chinese Medicine, Anhui University of Chinese Medicine, Hefei 230012, China
| | - Lei Zhu
- The First Affiliated Hospital of Anhui University of Chinese Medicine, Hefei 230038, China
| | - Zhongxiang Hu
- The First Affiliated Hospital of University of Science and Technology of China, Hefei 230000, China
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11
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Li C, Zhao J, Qin T, Jin Y, Duan C, Wu T, Romani MD, Cao Y, Lu H, Hu J. Comprehensive analysis of m6A methylation modification in chronic spinal cord injury in mice. J Orthop Res 2022; 41:1320-1334. [PMID: 36205185 DOI: 10.1002/jor.25457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 09/06/2022] [Accepted: 10/01/2022] [Indexed: 02/04/2023]
Abstract
Chronic spinal cord injury (CSCI) is a catastrophic disease of the central nervous system (CNS), resulting in partial or complete loss of neurological function. N6-methyladenosine (m6A) is the most common form of reversible posttranslational modification at the RNA level. However, the role of m6A modification in CSCI remains unknown. In this study, we established a CSCI model using a water-absorbable polyurethane polymer, with behavioral assessment, electrophysiological analysis, and histochemical staining for validation. Methylated RNA immunoprecipitation sequencing (meRIP-seq) and messenger RNA sequencing (mRNA-seq) were jointly explored to compare the differences between CSCI spinal tissue and normal spinal tissue. Furthermore, real-time quantitative reverse transcription pcr (qRT-PCR), western blot analysis, and immunofluorescence staining were used to analyze m6A modification-related proteins. We found that water-absorbable polyurethane polymer simulated well chronic spinal cord compression. Basso mouse scale scores and electrophysiological analysis showed continuous neurological function decline after chronic compression of the spinal cord. meRIP-seq identified 642 differentially modified m6A genes, among which 263 genes were downregulated and 379 genes were upregulated. mRNA-seq showed that 1544 genes were upregulated and 290 genes were downregulated after CSCI. Gene Ontology terms and enriched Kyoto Encyclopedia of Genes and Genomes pathways were also identified. qRT-PCR, western blotting, and immunofluorescence staining showed that Mettl14, Ythdf1, and Ythdf3 were significantly upregulated after CSCI. Our study revealed a comprehensive profile of m6A modifications in CSCI which may act as a valuable key for future research on CSCI.
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Affiliation(s)
- Chengjun Li
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Jinyun Zhao
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Tian Qin
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Yuxin Jin
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Chunyue Duan
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Tianding Wu
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Manini Daudi Romani
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Yong Cao
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Hongbin Lu
- Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China.,Department of Sports Medicine, Research Centre of Sports Medicine, Xiangya Hospital, Central South University, Changsha, China.,Hunan Engineering Research Center of Sports and Health, Changsha, China
| | - Jianzhong Hu
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
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12
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Zima L, West R, Smolen P, Kobori N, Hergenroeder G, Choi HA, Moore AN, Redell JB, Dash PK. Epigenetic Modifications and Their Potential Contribution to Traumatic Brain Injury Pathobiology and Outcome. J Neurotrauma 2022; 39:1279-1288. [PMID: 35481812 PMCID: PMC9529317 DOI: 10.1089/neu.2022.0128] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Epigenetic information is not permanently encoded in the DNA sequence, but rather consists of reversible, heritable modifications that regulate the gene expression profile of a cell. Epigenetic modifications can result in cellular changes that can be long lasting and include DNA methylation, histone methylation, histone acetylation, and RNA methylation. As epigenetic modifications are reversible, the enzymes that add (epigenetic writers), the proteins that decode (epigenetic readers), and the enzymes that remove (epigenetic erasers) these modifications can be targeted to alter cellular function and disease biology. While epigenetic modifications and their contributions are intense topics of current research in the context of a number of diseases, including cancer, inflammatory diseases, and Alzheimer disease, the study of epigenetics in the context of traumatic brain injury (TBI) is in its infancy. In this review, we will summarize the experimental and clinical findings demonstrating that TBI triggers epigenetic modifications, with a focus on changes in DNA methylation, histone methylation, and the translational utility of the universal methyl donor S-adenosylmethionine (SAM). Finally, we will review the evidence for using methyl donors as possible treatments for TBI-associated pathology and outcome.
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Affiliation(s)
- Laura Zima
- Department of Neurological Surgery, University of Texas Health Science Center McGovern Medical School, Houston, Texas, USA
| | - Rebecca West
- Department of Neurobiology and Anatomy, University of Texas Health Science Center McGovern Medical School, Houston, Texas, USA
| | - Paul Smolen
- Department of Neurobiology and Anatomy, University of Texas Health Science Center McGovern Medical School, Houston, Texas, USA
| | - Nobuhide Kobori
- Department of Neurobiology and Anatomy, University of Texas Health Science Center McGovern Medical School, Houston, Texas, USA
| | - Georgene Hergenroeder
- Department of Neurological Surgery, University of Texas Health Science Center McGovern Medical School, Houston, Texas, USA
| | - HuiMahn A. Choi
- Department of Neurological Surgery, University of Texas Health Science Center McGovern Medical School, Houston, Texas, USA
| | - Anthony N. Moore
- Department of Neurobiology and Anatomy, University of Texas Health Science Center McGovern Medical School, Houston, Texas, USA
| | - John B. Redell
- Department of Neurobiology and Anatomy, University of Texas Health Science Center McGovern Medical School, Houston, Texas, USA
| | - Pramod K. Dash
- Department of Neurobiology and Anatomy, University of Texas Health Science Center McGovern Medical School, Houston, Texas, USA
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13
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Tian M, Mao L, Zhang L. Crosstalk among N6-methyladenosine modification and RNAs in central nervous system injuries. Front Cell Neurosci 2022; 16:1013450. [PMID: 36246528 PMCID: PMC9556889 DOI: 10.3389/fncel.2022.1013450] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Accepted: 09/09/2022] [Indexed: 11/13/2022] Open
Abstract
Central nervous system (CNS) injuries, including traumatic brain injury (TBI), intracerebral hemorrhage (ICH) and ischemic stroke, are the most common cause of death and disability around the world. As the most common modification on ribonucleic acids (RNAs), N6-methyladenosine (m6A) modification has recently attracted great attentions due to its functions in determining the fate of RNAs through changes in splicing, translation, degradation and stability. A large number of studies have suggested that m6A modification played an important role in brain development and involved in many neurological disorders, particularly in CNS injuries. It has been proposed that m6A modification could improve neurological impairment, inhibit apoptosis, suppress inflammation, reduce pyroptosis and attenuate ferroptosis in CNS injuries via different molecules including phosphatase and tensin homolog (PTEN), NLR family pyrin domain containing 3 (NLRP3), B-cell lymphoma 2 (Bcl-2), glutathione peroxidase 4 (GPX4), and long non-coding RNA (lncRNA). Therefore, m6A modification showed great promise as potential targets in CNS injuries. In this article, we present a review highlighting the role of m6A modification in CNS injuries. Hence, on the basis of these properties and effects, m6A modification may be developed as therapeutic agents for CNS injury patients.
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Affiliation(s)
- Mi Tian
- Department of Anesthesiology, Affiliated Zhongda Hospital of Southeast University, Nanjing, Jiangsu, China
| | - Lei Mao
- Department of Neurosurgery, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu, China
| | - Li Zhang
- Department of Neurosurgery, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu, China
- *Correspondence: Li Zhang,
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14
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The Potential Role of m6A in the Regulation of TBI-Induced BGA Dysfunction. Antioxidants (Basel) 2022; 11:antiox11081521. [PMID: 36009239 PMCID: PMC9405408 DOI: 10.3390/antiox11081521] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 07/31/2022] [Accepted: 08/02/2022] [Indexed: 02/01/2023] Open
Abstract
The brain–gut axis (BGA) is an important bidirectional communication pathway for the development, progress and interaction of many diseases between the brain and gut, but the mechanisms remain unclear, especially the post-transcriptional regulation of BGA after traumatic brain injury (TBI). RNA methylation is one of the most important modifications in post-transcriptional regulation. N6-methyladenosine (m6A), as the most abundant post-transcriptional modification of mRNA in eukaryotes, has recently been identified and characterized in both the brain and gut. The purpose of this review is to describe the pathophysiological changes in BGA after TBI, and then investigate the post-transcriptional bidirectional regulation mechanisms of TBI-induced BGA dysfunction. Here, we mainly focus on the characteristics of m6A RNA methylation in the post-TBI BGA, highlight the possible regulatory mechanisms of m6A modification in TBI-induced BGA dysfunction, and finally discuss the outcome of considering m6A as a therapeutic target to improve the recovery of the brain and gut dysfunction caused by TBI.
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15
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Yu J, Chen H, Ma H, Zhang Z, Zhu X, Wang P, Liu R, Jin X, Zhao Y. Transcriptome-Wide N6-Methyladenosine Methylome Alteration in the Rat Spinal Cord After Acute Traumatic Spinal Cord Injury. Front Neurosci 2022; 16:848119. [PMID: 35706691 PMCID: PMC9189298 DOI: 10.3389/fnins.2022.848119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Accepted: 04/21/2022] [Indexed: 11/23/2022] Open
Abstract
Recent studies showed that RNA N6-methyladenosine (m6A) plays an important role in neurological diseases. We used methylated RNA immunoprecipitation sequencing (MeRIP-Seq) technology to generate the m6A modification map after traumatic spinal cord injury (TSCI). A total of 2,609 differential m6A peaks were identified after TSCI. Our RNA sequencing results after TSCI showed 4,206 genes with significantly altered expression. Cross-link analysis of m6A sequencing results and RNA sequencing results showed that 141 hyper-methylated genes were upregulated, 53 hyper-methylated genes were downregulated, 57 hypo-methylated genes were upregulated, and 197 hypo-methylated genes were downregulated. Among these, the important inflammatory response factor Tlr4 and the important member of the neurotrophin family Ngf were both upregulated and hyper-methylated after TSCI. This study provides that in the future, the epigenetic modifications of the genes could be used as an indicator of TSCI.
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Affiliation(s)
- Jiangtao Yu
- Emergency Center, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Haihua Chen
- Emergency Center, Zhongnan Hospital of Wuhan University, Wuhan, China
- Hubei Clinical Research Center for Emergency and Resuscitation, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Haoli Ma
- Department of Biological Repositories, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Zhongxiang Zhang
- Emergency Center, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Xiaolu Zhu
- Emergency Center, Zhongnan Hospital of Wuhan University, Wuhan, China
- *Correspondence: Xiaolu Zhu,
| | - Pengcheng Wang
- Emergency Center, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Ruining Liu
- Emergency Center, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Xiaoqing Jin
- Emergency Center, Zhongnan Hospital of Wuhan University, Wuhan, China
- Hubei Clinical Research Center for Emergency and Resuscitation, Zhongnan Hospital of Wuhan University, Wuhan, China
- Xiaoqing Jin,
| | - Yan Zhao
- Emergency Center, Zhongnan Hospital of Wuhan University, Wuhan, China
- Hubei Clinical Research Center for Emergency and Resuscitation, Zhongnan Hospital of Wuhan University, Wuhan, China
- Yan Zhao,
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