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Tiwari P, Mueed S, Abdulkareem AO, Hanif K. Activation of angiotensin converting enzyme 2 promotes hippocampal neurogenesis via activation of Wnt/β-catenin signaling in hypertension. Mol Cell Neurosci 2024; 130:103953. [PMID: 39013481 DOI: 10.1016/j.mcn.2024.103953] [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: 03/21/2024] [Revised: 07/07/2024] [Accepted: 07/10/2024] [Indexed: 07/18/2024] Open
Abstract
Hypertension-induced brain renin-angiotensin system (RAS) activation and neuroinflammation are hallmark neuropathological features of neurodegenerative diseases. Previous studies from our lab have shown that inhibition of ACE/Ang II/AT1R axis (by AT1R blockers or ACE inhibitors) reduced neuroinflammation and accompanied neurodegeneration via up-regulating adult hippocampal neurogenesis. Apart from this conventional axis, another axis of RAS also exists i.e., ACE2/Ang (1-7)/MasR axis, reported as an anti-hypertensive and anti-inflammatory. However, the role of this axis has not been explored in hypertension-induced glial activation and hippocampal neurogenesis in rat models of hypertension. Hence, in the present study, we examined the effect of ACE2 activator, Diminazene aceturate (DIZE) at 2 different doses of 10 mg/kg (non-antihypertensive) and 15 mg/kg (antihypertensive dose) in renovascular hypertensive rats to explore whether their effect on glial activation, neuroinflammation, and neurogenesis is either influenced by blood-pressure. The results of our study revealed that hypertension induced significant glial activation (astrocyte and microglial), neuroinflammation, and impaired hippocampal neurogenesis. However, ACE2 activation by DIZE, even at the low dose prevented these hypertension-induced changes in the brain. Mechanistically, ACE2 activation inhibited Ang II levels, TRAF6-NFκB mediated inflammatory signaling, NOX4-mediated ROS generation, and mitochondrial dysfunction by upregulating ACE2/Ang (1-7)/MasR signaling. Moreover, DIZE-induced activation of the ACE2/Ang (1-7)/MasR axis upregulated Wnt/β-catenin signaling, promoting hippocampal neurogenesis during the hypertensive state. Therefore, our study demonstrates that ACE2 activation can effectively prevent glial activation and enhance hippocampal neurogenesis in hypertensive conditions, regardless of its blood pressure-lowering effects.
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Affiliation(s)
- Priya Tiwari
- Division of Pharmacology, CSIR-Central Drug Research Institute, Lucknow 226031, U.P., India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Sumbul Mueed
- Division of Pharmacology, CSIR-Central Drug Research Institute, Lucknow 226031, U.P., India
| | - Adam Olaitan Abdulkareem
- Division of Pharmacology, CSIR-Central Drug Research Institute, Lucknow 226031, U.P., India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India; Animal Physiology Unit, Department of Zoology, University of Ilorin, Ilorin, Nigeria
| | - Kashif Hanif
- Division of Pharmacology, CSIR-Central Drug Research Institute, Lucknow 226031, U.P., India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India.
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Zhang L, Tang R, Liang D, Wang W, Min K, Luo T, Li X. Uncovering the Interaction between TRAF1 and MAVS in the RIG-I Pathway to Enhance the Upregulation of IRF1/ISG15 during Classical Swine Fever Virus Infection. Cells 2024; 13:1165. [PMID: 38995016 PMCID: PMC11240745 DOI: 10.3390/cells13131165] [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: 05/02/2024] [Revised: 06/28/2024] [Accepted: 07/06/2024] [Indexed: 07/13/2024] Open
Abstract
Classical swine fever (CSF) is caused by the classical swine fever virus (CSFV), which poses a threat to swine production. The activation of host innate immunity through linker proteins such as tumor necrosis factor receptor (TNF-R)-associated factor (TRAF) is crucial for the induction of the NF-κB pathway. Recent research has revealed the involvement of mitochondrial antiviral-signaling protein (MAVS) in the interaction with TRAF2, 3, 5, and 6 to activate both the NF-κB and IRF3 pathways. This study revealed that CSFV infection led to the upregulation of TRAF1 mRNA and protein levels; moreover, TRAF1 overexpression inhibited CSFV replication, while TRAF1 knockdown promoted replication, highlighting its importance in the host response to CSFV infection. Additionally, the expression of RIG-I, MAVS, TRAF1, IRF1, and ISG15 were detected in PK-15 cells infected with CSFV, revealing that TRAF1 plays a role in regulating IRF1 and ISG15 within the RIG-I pathway. Furthermore, Co-IP, GST pull-down, and IFA analyses demonstrated that TRAF1 interacted with MAVS and co-localized in the cytoplasm during CSFV infection. Ultimately, TRAF1 acted as a novel member of the TRAF family, bound to MAVS as a linker molecule, and functioned as a mediator downstream of MAVS in the RIG-I/MAVS pathway against CSFV replication.
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Affiliation(s)
- Liyuan Zhang
- College of Animal Sciences and Veterinary Medicine, Guangxi University, Nanning 530004, China; (L.Z.); (R.T.); (D.L.); (W.W.); (K.M.)
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004, China
| | - Rongze Tang
- College of Animal Sciences and Veterinary Medicine, Guangxi University, Nanning 530004, China; (L.Z.); (R.T.); (D.L.); (W.W.); (K.M.)
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004, China
| | - Dongli Liang
- College of Animal Sciences and Veterinary Medicine, Guangxi University, Nanning 530004, China; (L.Z.); (R.T.); (D.L.); (W.W.); (K.M.)
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004, China
| | - Wenfeng Wang
- College of Animal Sciences and Veterinary Medicine, Guangxi University, Nanning 530004, China; (L.Z.); (R.T.); (D.L.); (W.W.); (K.M.)
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004, China
| | - Kaijun Min
- College of Animal Sciences and Veterinary Medicine, Guangxi University, Nanning 530004, China; (L.Z.); (R.T.); (D.L.); (W.W.); (K.M.)
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004, China
| | - Tingrong Luo
- College of Animal Sciences and Veterinary Medicine, Guangxi University, Nanning 530004, China; (L.Z.); (R.T.); (D.L.); (W.W.); (K.M.)
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004, China
- Guaxi Zhuang Autonomous Region Engineering Research Center of Veterinary Biologics, Nanning 530004, China
- Guangxi Key Laboratory of Animal Breeding, Disease Control and Prevention, Nanning 530004, China
| | - Xiaoning Li
- College of Animal Sciences and Veterinary Medicine, Guangxi University, Nanning 530004, China; (L.Z.); (R.T.); (D.L.); (W.W.); (K.M.)
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004, China
- Guaxi Zhuang Autonomous Region Engineering Research Center of Veterinary Biologics, Nanning 530004, China
- Guangxi Key Laboratory of Animal Breeding, Disease Control and Prevention, Nanning 530004, China
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Xu H, Ban W, Tian J, Xu J, Tan Z, Li S, Chen K, Ou M, Li K. The New Roles of traf6 Gene Involved in the Development of Zebrafish Liver and Gonads. MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2024:10.1007/s10126-024-10329-5. [PMID: 38861111 DOI: 10.1007/s10126-024-10329-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Accepted: 05/27/2024] [Indexed: 06/12/2024]
Abstract
Traf6, an adaptor protein, exhibits non-conventional E3 ubiquitin ligase activity and was well studied as an important factor in immune systems and cancerogenesis. In mice, the traf6-null caused a perinatal death, so that the underlying pathophysiology of traf6-defeciency is still largely unclear in animals. Here, in the present study, a traf6 knockout zebrafish line (traf6-/-) was generated and could survive until adulthood, providing a unique opportunity to demonstrate the functions of traf6 gene in animals' organogenesis beyond the mouse model. The body of traf6-/- fish was found to be significantly shorter than that of the wildtype (WT). Likewise, a comparative transcriptome analysis showed that 866 transcripts were significantly altered in the traf6-/- liver, mainly involved in the immune system, metabolic pathways, and progesterone-mediated oocyte maturation. Especially, the mRNA expression of the pancreas duodenum homeobox protein 1 (pdx1), glucose-6-phosphatase (g6pcb), and the vitellogenesis genes (vtgs) were significantly decreased in the traf6-/- liver. Subsequently, the glucose was found to be accumulated in the traf6-/- liver tissues, and the meiotic germ cell was barely detected in traf6-/- testis or ovary. The findings of this study firstly implied the pivotal functions of traf6 gene in the liver and gonads' development in fish species.
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Affiliation(s)
- Hongyan Xu
- Integrative Science Center of Germplasm Creation in Western China (CHONGQING) Science City & College of Fisheries, Key Laboratory of Freshwater Fish Reproduction and Development, Key Laboratory of Aquatic Sciences of Chongqing, Southwest University, Ministry of Education, Chongqing, 402460, China.
| | - Wenzhuo Ban
- Integrative Science Center of Germplasm Creation in Western China (CHONGQING) Science City & College of Fisheries, Key Laboratory of Freshwater Fish Reproduction and Development, Key Laboratory of Aquatic Sciences of Chongqing, Southwest University, Ministry of Education, Chongqing, 402460, China
| | - Jiaming Tian
- Integrative Science Center of Germplasm Creation in Western China (CHONGQING) Science City & College of Fisheries, Key Laboratory of Freshwater Fish Reproduction and Development, Key Laboratory of Aquatic Sciences of Chongqing, Southwest University, Ministry of Education, Chongqing, 402460, China
| | - Jianfei Xu
- Integrative Science Center of Germplasm Creation in Western China (CHONGQING) Science City & College of Fisheries, Key Laboratory of Freshwater Fish Reproduction and Development, Key Laboratory of Aquatic Sciences of Chongqing, Southwest University, Ministry of Education, Chongqing, 402460, China
| | - Zhimin Tan
- Integrative Science Center of Germplasm Creation in Western China (CHONGQING) Science City & College of Fisheries, Key Laboratory of Freshwater Fish Reproduction and Development, Key Laboratory of Aquatic Sciences of Chongqing, Southwest University, Ministry of Education, Chongqing, 402460, China
| | - Sendong Li
- Integrative Science Center of Germplasm Creation in Western China (CHONGQING) Science City & College of Fisheries, Key Laboratory of Freshwater Fish Reproduction and Development, Key Laboratory of Aquatic Sciences of Chongqing, Southwest University, Ministry of Education, Chongqing, 402460, China
| | - Kaili Chen
- Integrative Science Center of Germplasm Creation in Western China (CHONGQING) Science City & College of Fisheries, Key Laboratory of Freshwater Fish Reproduction and Development, Key Laboratory of Aquatic Sciences of Chongqing, Southwest University, Ministry of Education, Chongqing, 402460, China
| | - Mi Ou
- Key Laboratory of Tropical & Subtropical Fishery Resource Application & Cultivation of Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, 510380, China
| | - Kaibin Li
- Key Laboratory of Tropical & Subtropical Fishery Resource Application & Cultivation of Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, 510380, China
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Doğanyiğit Z, Okan A, Yılmaz S, Uğuz AC, Akyüz E. Gender-related variation expressions of neuroplastin TRAF6, GluA1, GABA(A) receptor, and PMCA in cortex, hippocampus, and brainstem in an experimental epilepsy model. Synapse 2024; 78:e22289. [PMID: 38436644 DOI: 10.1002/syn.22289] [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: 07/21/2023] [Revised: 01/19/2024] [Accepted: 02/13/2024] [Indexed: 03/05/2024]
Abstract
Epileptic seizures are seen as a result of changing excitability balance depending on the deterioration in synaptic plasticity in the brain. Neuroplastin, and its related molecules which are known to play a role in synaptic plasticity, neurotransmitter activities that provide balance of excitability and, different neurological diseases, have not been studied before in epilepsy. In this study, a total of 34 Sprague-Dawley male and female rats, 2 months old, weighing 250-300 g were used. The epilepsy model in rats was made via pentylenetetrazole (PTZ). After the completion of the experimental procedure, the brain tissue of the rats were taken and the histopathological changes in the hippocampus and cortex parts and the brain stem were investigated, as well as the immunoreactivity of the proteins related to the immunohistochemical methods. As a result of the histopathological evaluation, it was determined that neuron degeneration and the number of dilated blood vessels in the hippocampus, frontal cortex, and brain stem were higher in the PTZ status epilepticus (SE) groups than in the control groups. It was observed that neuroplastin and related proteins TNF receptor-associated factor 6 (TRAF6), Gamma amino butyric acid type A receptors [(GABA(A)], and plasma membrane Ca2+ ATPase (PMCA) protein immunoreactivity levels increased especially in the male hippocampus, and only AMPA receptor subunit type 1 (GluA1) immunoreactivity decreased, unlike other proteins. We believe this may be caused by a problem in the mechanisms regulating the interaction of neuroplastin and GluA1 and may cause problems in synaptic plasticity in the experimental epilepsy model. It may be useful to elucidate this mechanism and target GluA1 when determining treatment strategies.
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Affiliation(s)
- Züleyha Doğanyiğit
- Faculty of Medicine, Department of Histology and Embryology, Yozgat Bozok University, Yozgat, Turkey
| | - Aslı Okan
- Faculty of Medicine, Department of Histology and Embryology, Yozgat Bozok University, Yozgat, Turkey
| | - Seher Yılmaz
- Faculty of Medicine, Department of Anatomy, Yozgat Bozok University, Yozgat, Turkey
| | - A Cihangir Uğuz
- Faculty of Medicine, Department of Biophysics, Karamanoglu Mehmetbey University, Karaman, Turkey
| | - Enes Akyüz
- Faculty of International Medicine, Department of Biophysics, University of Health Sciences, Istanbul, Turkey
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Ji J, Wang H, Yuan M, Li J, Song X, Lin K. Exosomes from ectopic endometrial stromal cells promote M2 macrophage polarization by delivering miR-146a-5p. Int Immunopharmacol 2024; 128:111573. [PMID: 38278065 DOI: 10.1016/j.intimp.2024.111573] [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: 08/19/2023] [Revised: 01/10/2024] [Accepted: 01/18/2024] [Indexed: 01/28/2024]
Abstract
BACKGROUND Ectopic endometrial stromal cells (ESCs) and M2 macrophages co-exist in the lesions of endometriosis and participate in the occurrence and progression of endometriosis. However, the interaction between ectopic ESCs and M2-type macrophage polarization is poorly understood. This study aims to investigate the effect of exosomes released from ectopic ESCs on M2 macrophage polarization and the potential mechanism. METHODS Human THP-1 monocytic cells induced macrophage differentiation (M0) and M2 polarization. Ectopic ESCs and their exosomes were used to stimulate M2 macrophages. M2 macrophage polarization was examined by detecting CD163 and ARG1 expression. Exosomal microRNAs were analyzed by small-RNA sequencing. RESULTS Our in vitro results suggest that exosomes of ectopic ESCs promoted M2 macrophage polarization. Meanwhile, The miR-146a-5p level was highly increased in ectopic ESCs and their exosomes and promoted the role of exosomes in M2 macrophage polarization. As a target, TRAF6 overexpression inhibits the function of miR-146a-5p mimic on M2 macrophage polarization. In the rat model, exosomes from ectopic ESCs contribute to the development of endometriosis. CONCLUSIONS It was suggested that exosomes derived from ectopic ESCs promote the M2 macrophage polarization by delivering miR-146a-5p targeting TRAF6 in the pathological process of endometriosis.
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Affiliation(s)
- Jiaqi Ji
- Hangzhou Normal University Division of Health Sciences, Yuhangtang Road 2318, Hangzhou, Zhejiang 311121, PR China
| | - Huihua Wang
- Department of Gynecology, the First People's Hospital of Tongxiang, Jiaochang Road 1918, Tongxiang, Zhejiang 314500, PR China
| | - Ming Yuan
- Hangzhou Normal University Division of Health Sciences, Yuhangtang Road 2318, Hangzhou, Zhejiang 311121, PR China
| | - Jin Li
- Department of Gynecology, Women's Hospital of Hangzhou Normal University, Kunpeng Road 369, Hangzhou, Zhejiang 310000, PR China
| | - Xiaohong Song
- Department of Gynecology, Women's Hospital of Hangzhou Normal University, Kunpeng Road 369, Hangzhou, Zhejiang 310000, PR China
| | - Kaiqing Lin
- Department of Gynecology and Obstetrics, Affiliated Hangzhou Chest Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310003, PR China.
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Jiang Y, Li L, Wu R, Wu L, Zhang B, Wang JZ, Liu R, Liu F, Wang J, Wang X. c-Src regulates δ-secretase activation and truncated Tau production by phosphorylating the E3 ligase Traf6. J Biol Chem 2023; 299:105462. [PMID: 37977223 PMCID: PMC10711223 DOI: 10.1016/j.jbc.2023.105462] [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: 06/20/2023] [Revised: 10/31/2023] [Accepted: 11/05/2023] [Indexed: 11/19/2023] Open
Abstract
The accumulation of abnormal Tau protein is a common feature of various neurodegenerative diseases. Truncated Tau, resulting from cleavage by asparaginyl endopeptidase (AEP, δ-secretase), promotes its own phosphorylation and aggregation. Our study focused on understanding the regulatory mechanisms of AEP activation and its interaction with other proteins. We discovered that c-Src plays a critical role in mediating the activation and polyubiquitination of AEP in response to epidermal growth factor stimulation. In addition, we investigated the involvement of tumor necrosis factor receptor-associated factor 6 (Traf6), an E3 ligase, in the regulation of AEP levels and its interaction with c-Src. Knockdown of Traf6 effectively inhibited c-Src-induced AEP activation. To gain further insights into the molecular mechanisms, we employed mass spectrometry to identify the specific tyrosine residues of Traf6 that are phosphorylated by c-Src. By mutating these phosphorylation sites to phenylalanine, we disrupted Traf6-mediated polyubiquitination and subsequently observed the inactivation of AEP. This finding suggests that the phosphorylation of Traf6 by c-Src is crucial for AEP activation. Pharmacological inhibition of c-Src reduced the phosphorylation of Traf6 and inhibited AEP activation in neurons derived from human-induced pluripotent stem cells. Conditional knockout of Traf6 in neurons prevented c-Src-induced AEP activation and subsequent Tau truncation in vivo. Moreover, phosphorylation of Traf6 is highly correlated with AEP activation, Tau368 and pathological Tau (AT8) in Alzheimer's disease brain. Overall, our study elucidates the role of c-Src in regulating AEP-cleaved Tau through phosphorylating Traf6. Targeting the c-Src-Traf6 pathway may hold potential for the treatment of Alzheimer's disease and other tauopathies.
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Affiliation(s)
- Yanli Jiang
- Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry/Hubei Province of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Longfei Li
- Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry/Hubei Province of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ruozhen Wu
- Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry/Hubei Province of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Liulin Wu
- Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry/Hubei Province of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Bin Zhang
- Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry/Hubei Province of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jian-Zhi Wang
- Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry/Hubei Province of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu, China
| | - Rong Liu
- Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry/Hubei Province of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Fei Liu
- Department of Neurochemistry, Inge Grundke-Iqbal Research Floor, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, New York, USA.
| | - Jing Wang
- Department of Immunology School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
| | - Xiaochuan Wang
- Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry/Hubei Province of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu, China; Shenzhen Huazhong University of Science and Technology Research Institute, Shenzhen, China.
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Yang P, Wang Y, Ge W, Jing Y, Hu H, Yin J, Xue M, Wang Y, Li X, Li X, Shi Y, Tan J, Li Y, Yan S. m6A methyltransferase METTL3 contributes to sympathetic hyperactivity post-MI via promoting TRAF6-dependent mitochondrial ROS production. Free Radic Biol Med 2023; 209:342-354. [PMID: 37898386 DOI: 10.1016/j.freeradbiomed.2023.10.392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 09/17/2023] [Accepted: 10/13/2023] [Indexed: 10/30/2023]
Abstract
OBJECTIVES N6-methyladenosine (m6A) is the most prevalent post-translational modification in eukaryotic mRNA. Recently, m6A editing modified by methyltransferase-like enzyme 3 (METTL3), the core m6A methyltransferase, has been demonstrated to be involved in cardiac sympathetic hyperactivity. This study aimed to clarify the effects and underlying mechanisms of METTL3 in the paraventricular nucleus (PVN) in mediating sympathetic activity following myocardial infarction (MI). METHODS We established rat MI models by left anterior descending coronary artery ligation. m6A quantification was performed.The expression of METTL3 and its downstream gene, tumor necrosis factor (TNF) receptor-associated factor 6 (TRAF6), were determined. The functional role of METTL3 in sympathetic hyperactivity and electrical conduction stability were verified by assessing renal sympathetic nerve activity (RSNA), norepinephrine (NE) levels, and programmed electrical stimulation. Rescue experiments were also conducted. The mechanism by which m6A is involved in mitochondrial reactive oxygen species (mROS) production, mediated by TRAF6/ECSIT pathway, was explored in lipopolysaccharide (LPS) treated primary microglial cells. RESULTS METTL3 was predominantly localized in the microglia and significantly increased within the PVN at 3 days post-MI. Inhibition of METTL3 decreased m6A levels, TRAF6 expression, and mROS production; downregulated sympathoexcitation, indicated by attenuated NE concentration and RSNA; decreased the incidence of ventricular tachycardia or fibrillation; and improved cardiac function. Mechanistically, downregulation of METTL3 prevented TRAF6 translocation to the mitochondria in the microglia and subsequent TRAF6/ECSIT pathway activation, resulting in decreased mROS production. CONCLUSIONS This study demonstrates that METTL3-mediated m6A modification promotes sympathetic hyperactivity through TRAF6/ECSIT pathway and mitochondrial oxidative stress in the PVN, thereby leading to ventricular arrhythmias post-MI.
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Affiliation(s)
- Peijin Yang
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China; Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
| | - Yu Wang
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Weili Ge
- Department of Cardiology, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Zhejiang, China
| | - Yanyan Jing
- Department of Cardiology, Yantai Yuhuangding Hospital, Yantai, China
| | - Hesheng Hu
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Jie Yin
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Mei Xue
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Ye Wang
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Xiaolu Li
- Department of Emergency, The First Affiliated Hospital of Shandong First Medical University, Jinan, China
| | - Xinran Li
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Yugen Shi
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Jiayu Tan
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Yan Li
- Medical Research Center, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Suhua Yan
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China.
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Chen Z, Joseph D, Ding M, Bhujbal SP, Rajan RPS, Kim E, Park SW, Lee S, Lee TH. Synthesis and evaluation of 2-NMPA derivatives as potential agents for prevention of osteoporosis in vitro and in vivo. Eur J Med Chem 2023; 260:115767. [PMID: 37651877 DOI: 10.1016/j.ejmech.2023.115767] [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: 03/30/2023] [Revised: 07/25/2023] [Accepted: 08/25/2023] [Indexed: 09/02/2023]
Abstract
Abnormal osteoclast differentiation causes various bone disorders such as osteoporosis. Targeting the formation and activation of osteoclasts has been recognized as an effective approach for preventing osteoporosis. Herein, we synthesized eleven 2-NMPA derivatives which are (2-(2-chlorophenoxy)-N-(4-alkoxy-2-morpholinophenyl) acetamides, and evaluated their suppression effects on osteoclastogenesis in vitro by using TRAP-staining assay. Among the synthesized eleven novel 2-NMPAs, 4-(2-(2-chlorophenoxy)acetamido)-3-morpholinophenyl trifluoromethanesulfonate (11b), 4-(2-(2-chlorophenoxy) acetamido)-3-morpholinophenyl-3-(N-(2-oxo-2-((2-(phenylthio) phenyl) amino) ethyl)methylsulfonamido)benzoate (11d), and 4-(2-(2-chlorophenoxy) acetamido)-3-morpholinophenyl 4-acetamidobenzenesulfonate (11h) displayed highly inhibitory bioactivity on the differentiation of primary osteoclasts. 11h was selected for further investigation of the inhibitory effects and potential mechanism involved in the suppression of osteoclastogenesis. In vitro analysis suggested that 11h inhibited osteoclastogenesis with an IC50 of 358.29 nM, decreased the formation of F-action belts and bone resorption, without interfering cell viability and osteoblast differentiation. Furthermore, the mRNA expressions of osteoclast-specific genes such as Acp5, Nfatc1, Dc-stamp, Atp6v0d2, Mmp9, and Ctsk significantly decreased following 11h treatment. RANKL-induced osteoclast-specific proteins analysis demonstrated that 11h suppressed osteoclast differentiation by downregulating of RANKL-mediated TRAF6 expression, followed by inactivation of PI3K/AKT and IκBα/NF-κB signaling pathways. Finally, 11h inhibited ovariectomy-induced bone loss in vivo. Therefore, the current work highlighted the therapeutic potential of 11h as an anti-osteoporosis lead compound.
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Affiliation(s)
- Zhihao Chen
- BioMedical Sciences Graduate Program (BMSGP), Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Devaneyan Joseph
- Department of Chemistry, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Mina Ding
- BioMedical Sciences Graduate Program (BMSGP), Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Swapnil Pandurang Bhujbal
- Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, 426-791, Republic of Korea
| | | | - Eunae Kim
- Department of Pharmacy, College of Pharmacy, Chosun University, Gwangju, 61452, Republic of Korea
| | - Sang-Wook Park
- Department of Oral Biochemistry, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Sunwoo Lee
- Department of Chemistry, Chonnam National University, Gwangju, 61186, Republic of Korea.
| | - Tae-Hoon Lee
- Department of Oral Biochemistry, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju, 61186, Republic of Korea.
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9
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Guven O, Sever B, Başoğlu-Ünal F, Ece A, Tateishi H, Koga R, Radwan MO, Demir N, Can M, Dilsiz Aytemir M, Inoue JI, Otsuka M, Fujita M, Ciftci H, DeMirci H. Structural Characterization of TRAF6 N-Terminal for Therapeutic Uses and Computational Studies on New Derivatives. Pharmaceuticals (Basel) 2023; 16:1608. [PMID: 38004473 PMCID: PMC10674494 DOI: 10.3390/ph16111608] [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: 08/31/2023] [Revised: 11/09/2023] [Accepted: 11/09/2023] [Indexed: 11/26/2023] Open
Abstract
Tumor necrosis factor receptor-associated factors (TRAFs) are a protein family with a wide variety of roles and binding partners. Among them, TRAF6, a ubiquitin ligase, possesses unique receptor binding specificity and shows diverse functions in immune system regulation, cellular signaling, central nervous system, and tumor formation. TRAF6 consists of an N-terminal Really Interesting New Gene (RING) domain, multiple zinc fingers, and a C-terminal TRAF domain. TRAF6 is an important therapeutic target for various disorders and structural studies of this protein are crucial for the development of next-generation therapeutics. Here, we presented a TRAF6 N-terminal structure determined at the Turkish light source "Turkish DeLight" to be 3.2 Å resolution at cryogenic temperature (PDB ID: 8HZ2). This structure offers insight into the domain organization and zinc-binding, which are critical for protein function. Since the RING domain and the zinc fingers are key targets for TRAF6 therapeutics, structural insights are crucial for future research. Separately, we rationally designed numerous new compounds and performed molecular docking studies using this template (PDB ID:8HZ2). According to the results, 10 new compounds formed key interactions with essential residues and zinc ion in the N-terminal region of TRAF6. Molecular dynamic (MD) simulations were performed for 300 ns to evaluate the stability of three docked complexes (compounds 256, 322, and 489). Compounds 256 and 489 was found to possess favorable bindings with TRAF6. These new compounds also showed moderate to good pharmacokinetic profiles, making them potential future drug candidates as TRAF6 inhibitors.
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Affiliation(s)
- Omur Guven
- Department of Molecular Biology and Genetics, Koç University, Istanbul 34450, Turkey;
| | - Belgin Sever
- Medicinal and Biological Chemistry Science Farm Joint Research Laboratory, Faculty of Life Sciences, Kumamoto University, Kumamoto 862-0973, Japan; (B.S.); (H.T.); (R.K.); (M.O.); (M.F.)
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Anadolu University, Eskisehir 26470, Turkey
| | - Faika Başoğlu-Ünal
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, European University of Lefke, Northern Cyprus, TR-10, Mersin 99770, Turkey;
| | - Abdulilah Ece
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Biruni University, Istanbul 34015, Turkey;
| | - Hiroshi Tateishi
- Medicinal and Biological Chemistry Science Farm Joint Research Laboratory, Faculty of Life Sciences, Kumamoto University, Kumamoto 862-0973, Japan; (B.S.); (H.T.); (R.K.); (M.O.); (M.F.)
| | - Ryoko Koga
- Medicinal and Biological Chemistry Science Farm Joint Research Laboratory, Faculty of Life Sciences, Kumamoto University, Kumamoto 862-0973, Japan; (B.S.); (H.T.); (R.K.); (M.O.); (M.F.)
| | - Mohamed O. Radwan
- Medicinal and Biological Chemistry Science Farm Joint Research Laboratory, Faculty of Life Sciences, Kumamoto University, Kumamoto 862-0973, Japan; (B.S.); (H.T.); (R.K.); (M.O.); (M.F.)
| | - Nefise Demir
- Department of Nanoscience and Nanotechnology, Izmir Katip Celebi University, Izmir 35620, Turkey;
| | - Mustafa Can
- Faculty of Engineering and Architecture, Department of Engineering Sciences, Izmir Katip Celebi University, Izmir 35620, Turkey;
| | - Mutlu Dilsiz Aytemir
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, İzmir Katip Çelebi University, Izmir 35620, Turkey;
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Hacettepe University, Ankara 6100, Turkey
| | - Jun-ichiro Inoue
- Research Platform Office, The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan;
| | - Masami Otsuka
- Medicinal and Biological Chemistry Science Farm Joint Research Laboratory, Faculty of Life Sciences, Kumamoto University, Kumamoto 862-0973, Japan; (B.S.); (H.T.); (R.K.); (M.O.); (M.F.)
- Department of Drug Discovery, Science Farm Ltd., Kumamoto 862-0976, Japan
| | - Mikako Fujita
- Medicinal and Biological Chemistry Science Farm Joint Research Laboratory, Faculty of Life Sciences, Kumamoto University, Kumamoto 862-0973, Japan; (B.S.); (H.T.); (R.K.); (M.O.); (M.F.)
| | - Halilibrahim Ciftci
- Department of Molecular Biology and Genetics, Koç University, Istanbul 34450, Turkey;
- Medicinal and Biological Chemistry Science Farm Joint Research Laboratory, Faculty of Life Sciences, Kumamoto University, Kumamoto 862-0973, Japan; (B.S.); (H.T.); (R.K.); (M.O.); (M.F.)
- Department of Drug Discovery, Science Farm Ltd., Kumamoto 862-0976, Japan
| | - Hasan DeMirci
- Department of Molecular Biology and Genetics, Koç University, Istanbul 34450, Turkey;
- Koc University Isbank Center for Infectious Diseases (KUISCID), Koc University, Istanbul 34010, Turkey
- Stanford PULSE Institute, SLAC National Laboratory, Menlo Park, CA 94025, USA
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10
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Wei B, Su Z, Yang H, Feng Y, Meng C, Liang Z. Inhibition of TRAF6 improves hyperlipidemic acute pancreatitis by alleviating pyroptosis in vitro and in vivo rat models. Biol Direct 2023; 18:23. [PMID: 37165439 PMCID: PMC10170794 DOI: 10.1186/s13062-023-00380-y] [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: 02/12/2023] [Accepted: 05/01/2023] [Indexed: 05/12/2023] Open
Abstract
OBJECTIVE Hypertriglyceridemia (HTG) is one of the common causes of acute pancreatitis (AP). Hyperlipidemic acute pancreatitis (HTG-AP) is associated with higher mortality owing to its tendency for greater severity and rapid progression. The purpose of this study was to explore the mechanism of involvement of tumor necrosis factor receptor-related factor 6 (TRAF6) in pyroptosis during HTG-AP. METHODS The HTG environment was simulated with palmitic acid treatment in vitro and a high-fat diet in vivo. Cerulein was used to establish the HTG-AP model, followed by genetic and pharmacological inhibition of TRAF6. Pyroptosis activation, inflammatory reaction, and the interaction between TRAF6 and pyroptosis in HTG-AP were assessed. RESULTS HTG was found to aggravate the development of pancreatitis, accompanied by increased pyroptosis and enhanced inflammatory response in HTG-AP models. Mechanistically, TRAF6 downregulation decreased the activation of pyroptosis in cerulein-induced HTG-AP. CONCLUSION Collectively, inhibition of TRAF6 improved HTG-AP and the associated inflammation by alleviating pyroptosis.
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Affiliation(s)
- Biwei Wei
- Department of Gastroenterology, The First Affiliated Hospital of Guangxi Medical University, No. 6 Shuangyong Road, 530021, Nanning, Guangxi Zhuang Autonomous Region, China
| | - Zhou Su
- Department of Gastroenterology, The First Affiliated Hospital of Guangxi Medical University, No. 6 Shuangyong Road, 530021, Nanning, Guangxi Zhuang Autonomous Region, China
| | - Huiying Yang
- Department of Gastroenterology, The First Affiliated Hospital of Guangxi Medical University, No. 6 Shuangyong Road, 530021, Nanning, Guangxi Zhuang Autonomous Region, China
| | - Yong Feng
- Department of Gastroenterology, The First Affiliated Hospital of Guangxi Medical University, No. 6 Shuangyong Road, 530021, Nanning, Guangxi Zhuang Autonomous Region, China
| | - Chunmei Meng
- Life Sciences Institute, Guangxi Medical University, Nanning, China
| | - Zhihai Liang
- Department of Gastroenterology, The First Affiliated Hospital of Guangxi Medical University, No. 6 Shuangyong Road, 530021, Nanning, Guangxi Zhuang Autonomous Region, China.
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11
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Cheng Z, Li X, Ye X, Yu R, Deng Y. Purpurogallin Reverses Neuronal Apoptosis and Enhances "M2" Polarization of Microglia Under Ischemia via Mediating the miR-124-3p/TRAF6/NF-κB Axis. Neurochem Res 2023; 48:375-392. [PMID: 36131212 DOI: 10.1007/s11064-022-03752-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 08/30/2022] [Accepted: 09/01/2022] [Indexed: 02/04/2023]
Abstract
Purpurogallin (PPG) has been demonstrated to exert an anti-inflammatory function in neurological diseases. This study aimed at investigating the role of PPG on microglial polarization post ischemic stroke as well as the underlying mechanism. Mouse hippocampal neurons HT-22 and microglial BV2 cells were treated by oxygen and glucose deprivation to simulate an in-vitro ischemia model. qRT-PCR and ELISA examined expression of cytokines in microglia. CCK8 and flow cytometry measured HT-22 cell viability and apoptosis, respectively. The levels of miR-124-3p and TRAF6/NF-κB were determined. A mouse cerebral ischemia model was set up using middle cerebral artery occlusion (MCAO) method. After being dealt with PPG, the neurological functions, brain edema, neuronal apoptosis, and microglia activation of the mice were evaluated. As suggested by the results, PPG transformed "M1" to "M2" polarization of BV2 cells, and abated HT-22 cell apoptosis. PPG enhanced the neurological functions, alleviated brain edema, and decreased neuroinflammatory responses, and neuronal apoptosis in the brain lesions of MCAO mice. Furthermore, PPG enhanced miR-124-3p and repressed the TRAF6/NF-κB pathway. miR-124-3p suppressed the TRAF6/NF-κB pathway by targeting TRAF6. Collectively, PPG alleviates ischemia-induced neuronal damage and microglial inflammation by modulating the miR-124-3p/TRAF6/NF-κB pathway.
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Affiliation(s)
- Zongxin Cheng
- Department of Neurology, Nanchang First Hospital, No.128 Xiangshan North Road, Donghu District, Nanchang, 330006, Jiangxi, China.
| | - Xinming Li
- Department of Neurology, Nanchang First Hospital, No.128 Xiangshan North Road, Donghu District, Nanchang, 330006, Jiangxi, China
| | - Xiaohua Ye
- Department of Oncology, Jiangxi Maternal and Child Health Hospital, Nanchang, 330006, Jiangxi, China
| | - Rong Yu
- Department of Neurology, Nanchang First Hospital, No.128 Xiangshan North Road, Donghu District, Nanchang, 330006, Jiangxi, China
| | - Youqing Deng
- Department of Neurology, Nanchang First Hospital, No.128 Xiangshan North Road, Donghu District, Nanchang, 330006, Jiangxi, China
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12
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Yan T, Chen Z, Zou S, Wang Z, Du Q, Yu W, Hu W, Zheng Y, Wang K, Dong X, Dong S. A prospective cohort study on serum A20 as a prognostic biomarker of aneurysmal subarachnoid hemorrhage. World J Emerg Med 2023; 14:360-366. [PMID: 37908792 PMCID: PMC10613794 DOI: 10.5847/wjem.j.1920-8642.2023.079] [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: 03/15/2023] [Accepted: 07/10/2023] [Indexed: 11/02/2023] Open
Abstract
BACKGROUND A20 may be a neuroprotective factor. Herein, we aimed to investigate whether serum A20 levels were associated with disease severity, delayed cerebral ischemia (DCI), and outcome after aneurysmal subarachnoid hemorrhage (aSAH). METHODS In this prospective cohort study containing 112 aSAH patients and 112 controls, serum A20 levels were quantified. At 90 d poststroke, Modified Rankin Scale (MRS) scores ≥3 were defined as a poor outcome. All correlations and associations were assessed using multivariate analysis. RESULTS Compared with controls, there was a significant elevation of serum A20 levels in patients (median 123.7 pg/mL vs. 25.8 pg/mL; P<0.001). Serum A20 levels were independently correlated with Hunt-Hess scores (β 9.854; 95% confidence interval [95% CI] 2.481-17.227, P=0.009) and modified Fisher scores (β 10.349, 95% CI 1.273-19.424, P=0.026). Independent associations were found between serum A20 levels and poor outcome (odds ratio [OR] 1.015, 95% CI 1.000-1.031, P=0.047) and DCI (OR 1.018, 95% CI 1.001-1.035, P=0.042). Areas under the curve for predicting poor outcome and DCI were 0.771 (95% CI 0.682-0.845) and 0.777 (95% CI 0.688-0.850), respectively. Serum A20 levels ≥128.15 pg/mL predicted poor outcome, with a sensitivity of 73.9% and specificity of 74.2%, and A20 levels ≥160.55 pg/mL distinguished the risk of DCI with 65.5% sensitivity and 89.2% specificity. Its ability to predict poor outcome and DCI was similar to those of Hunt-Hess scores and modified Fisher scores (both P>0.05). CONCLUSION Enhanced serum A20 levels are significantly associated with stroke severity and poor clinical outcome after aSAH, implying that serum A20 may be a potential prognostic biomarker for aSAH.
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Affiliation(s)
- Tian Yan
- The Fourth School of Clinical Medicine, Zhejiang Chinese Medical University, Hangzhou 322000, China
| | - Ziyin Chen
- The Fourth School of Clinical Medicine, Zhejiang Chinese Medical University, Hangzhou 322000, China
| | - Shengdong Zou
- The Fourth School of Clinical Medicine, Zhejiang Chinese Medical University, Hangzhou 322000, China
| | - Zefan Wang
- The Fourth School of Clinical Medicine, Zhejiang Chinese Medical University, Hangzhou 322000, China
| | - Quan Du
- Department of Neurosurgery, Affiliated Hangzhou First People’s Hospital, Zhejiang University School of Medicine, Hangzhou 310006, China
| | - Wenhua Yu
- Department of Neurosurgery, Affiliated Hangzhou First People’s Hospital, Zhejiang University School of Medicine, Hangzhou 310006, China
| | - Wei Hu
- Department of Intensive Care Unit, Affiliated Hangzhou First People’s Hospital, Zhejiang University School of Medicine, Hangzhou 310006, China
| | - Yongke Zheng
- Department of Intensive Care Unit, Affiliated Hangzhou First People’s Hospital, Zhejiang University School of Medicine, Hangzhou 310006, China
| | - Keyi Wang
- Clinical Laboratory Center, Affiliated Hangzhou First People’s Hospital, Zhejiang University School of Medicine, Hangzhou 310006, China
| | - Xiaoqiao Dong
- Department of Neurosurgery, Affiliated Hangzhou First People’s Hospital, Zhejiang University School of Medicine, Hangzhou 310006, China
| | - Shuangyong Dong
- Emergency Department, Affiliated Hangzhou First People’s Hospital, Zhejiang University School of Medicine, Hangzhou 310006, China
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13
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Shu L, Du C. PHLDA1 promotes sevoflurane-induced pyroptosis of neuronal cells in developing rats through TRAF6-mediated activation of Rac1. Neurotoxicology 2022; 93:140-151. [PMID: 36155068 DOI: 10.1016/j.neuro.2022.09.007] [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: 06/16/2022] [Revised: 09/18/2022] [Accepted: 09/19/2022] [Indexed: 10/14/2022]
Abstract
Sevoflurane anesthesia induces neurocognitive impairment and pyroptosis in the developing brain. Pleckstrin homology-like domain, family A, member 1 (PHLDA1) was involved in neuronal apoptosis, oxidative stress and inflammation during ischemic stroke. The role of PHLDA1 in sevoflurane-induced pyroptosis in developing rats was investigated. Firstly, neonatal rats at day 7 was exposed to 2.0% sevoflurane for 6 h to induce neurotoxicity. Pathological analysis showed that sevoflurane anesthesia induced hippocampal injury and reduced the number of neurons. The expression of PHLDA1 was elevated in hippocampus of sevoflurane-treated rats. Secondly, sevoflurane anesthesia-treated neonatal rats were injected with adeno-associated virus serotype (AAV) to mediate knockdown of PHLDA1. Injection with AAV-shPHLDA1 ameliorated sevoflurane-induced hippocampal injury and neurocognitive impairment in rats. Moreover, knockdown of PHLDA1 increased the number of neurons in sevoflurane-treated rats. Silence of PHLDA1 suppressed neuronal apoptosis, and inhibited pyroptosis in sevoflurane-treated rats. Thirdly, PHLDA1 was also elevated in sevoflurane-treated primary neuronal cells. Loss of PHLDA1 also enhanced cell viability and suppressed pyroptosis of sevoflurane-treated primary neuronal cells. Lastly, silence of PHLDA1 reduced protein expression of TRAF6 and p-Rac1 in sevoflurane-treated rats and neuronal cells. Over-expression of TRAF6 attenuated PHLDA1 silence-induced increase of cell viability and decreased pyroptosis in neuronal cells. In conclusion, loss of PHLDA1 protected against sevoflurane-induced pyroptosis in developing rats through inhibition of TRAF6-mediated activation of Rac1.
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Affiliation(s)
- Lijuan Shu
- Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Chengdu, Sichuan 610041, China; Department of ICU, West China Second University Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Chunfu Du
- Department of Neurosurgery, Ya'an people's Hospital, Sichuan, Ya'an, Sichuan 625000, China.
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14
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Song D, Yeh CT, Wang J, Guo F. Perspectives on the mechanism of pyroptosis after intracerebral hemorrhage. Front Immunol 2022; 13:989503. [PMID: 36131917 PMCID: PMC9484305 DOI: 10.3389/fimmu.2022.989503] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 08/17/2022] [Indexed: 12/18/2022] Open
Abstract
Intracerebral hemorrhage (ICH) is a highly harmful neurological disorder with high rates of mortality, disability, and recurrence. However, effective therapies are not currently available. Secondary immune injury and cell death are the leading causes of brain injury and a poor prognosis. Pyroptosis is a recently discovered form of programmed cell death that differs from apoptosis and necrosis and is mediated by gasdermin proteins. Pyroptosis is caused by multiple pathways that eventually form pores in the cell membrane, facilitating the release of inflammatory substances and causing the cell to rupture and die. Pyroptosis occurs in neurons, glial cells, and endothelial cells after ICH. Furthermore, pyroptosis causes cell death and releases inflammatory factors such as interleukin (IL)-1β and IL-18, leading to a secondary immune-inflammatory response and further brain damage. The NOD-like receptor protein 3 (NLRP3)/caspase-1/gasdermin D (GSDMD) pathway plays the most critical role in pyroptosis after ICH. Pyroptosis can be inhibited by directly targeting NLRP3 or its upstream molecules, or directly interfering with caspase-1 expression and GSDMD formation, thus significantly improving the prognosis of ICH. The present review discusses key pathological pathways and regulatory mechanisms of pyroptosis after ICH and suggests possible intervention strategies to mitigate pyroptosis and brain dysfunction after ICH.
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Affiliation(s)
- Dengpan Song
- Department of Neurosurgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Chi-Tai Yeh
- Department of Medical Research and Education, Shuang Ho Hospital, Taipei Medical University, New Taipei City, Taiwan
- *Correspondence: Fuyou Guo, ; Jian Wang, ; Chi-Tai Yeh,
| | - Jian Wang
- Department of Pain Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Department of Human Anatomy, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, China
- *Correspondence: Fuyou Guo, ; Jian Wang, ; Chi-Tai Yeh,
| | - Fuyou Guo
- Department of Neurosurgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- *Correspondence: Fuyou Guo, ; Jian Wang, ; Chi-Tai Yeh,
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15
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The RING finger protein family in health and disease. Signal Transduct Target Ther 2022; 7:300. [PMID: 36042206 PMCID: PMC9424811 DOI: 10.1038/s41392-022-01152-2] [Citation(s) in RCA: 49] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 07/31/2022] [Accepted: 08/09/2022] [Indexed: 02/05/2023] Open
Abstract
Ubiquitination is a highly conserved and fundamental posttranslational modification (PTM) in all eukaryotes regulating thousands of proteins. The RING (really interesting new gene) finger (RNF) protein, containing the RING domain, exerts E3 ubiquitin ligase that mediates the covalent attachment of ubiquitin (Ub) to target proteins. Multiple reviews have summarized the critical roles of the tripartite-motif (TRIM) protein family, a subgroup of RNF proteins, in various diseases, including cancer, inflammatory, infectious, and neuropsychiatric disorders. Except for TRIMs, since numerous studies over the past decades have delineated that other RNF proteins also exert widespread involvement in several diseases, their importance should not be underestimated. This review summarizes the potential contribution of dysregulated RNF proteins, except for TRIMs, to the pathogenesis of some diseases, including cancer, autoimmune diseases, and neurodegenerative disorder. Since viral infection is broadly involved in the induction and development of those diseases, this manuscript also highlights the regulatory roles of RNF proteins, excluding TRIMs, in the antiviral immune responses. In addition, we further discuss the potential intervention strategies targeting other RNF proteins for the prevention and therapeutics of those human diseases.
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Li T, Li Y, Li JW, Qin YH, Zhai H, Feng B, Li H, Zhang NN, Yang CS. Expression of TRAF6 in peripheral blood B cells of patients with myasthenia gravis. BMC Neurol 2022; 22:302. [PMID: 35978310 PMCID: PMC9382794 DOI: 10.1186/s12883-022-02833-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Accepted: 08/08/2022] [Indexed: 11/16/2022] Open
Abstract
Background Tumor necrosis factor receptor-associated factor 6 (TRAF6) can regulate the activation of inflammatory signaling pathways by acting as an E3 ubiquitin ligase, which enhances B cell activation. This study aimed to evaluate the expression of TRAF6 in the peripheral blood B cells of myasthenia gravis (MG) patients and analyze the relationships between TRAF6 expression and clinical characteristics. Method In our study, the expression level of TRAF6 in peripheral blood B cells of 89 patients was measured by flow cytometry compared with that of healthy subjects. The effects of disease severity, MG classification and immunotherapy on TRAF6 expression level were also analyzed. Results In our study, TRAF6 expression was elevated in CD19+ B cells and CD19+CD27+ memory B cells in generalized MG (GMG) patients compared with ocular MG (OMG) patients (p = 0.03 and p = 0.03, respectively). There was a significant positive correlation between the TRAF6 expression level and disease severity in both OMG patients and GMG patients (CD19+ B cells: OMG: p < 0.001, r = 0.89; GMG: p = 0.001, r = 0.59; CD29+CD27+ B cells: OMG: p = 0.001, r = 0.80; GMG: p = 0.048, r = 0.38). TRAF6 expression was significantly elevated in CD19+ B cells and CD19+CD27+ memory B cells in GMG with acute aggravation compared with GMG in MMS (p = 0.009 and p = 0.028, respectively). In the eleven MG patients who were followed, TRAF6 expression in B cells and memory B cells was significantly decreased after treatment (p = 0.03 and p < 0.01, respectively). Conclusion TRAF6 is potentially a useful biomarker of inflammation in patients with MG, and might be used to evaluate the effectiveness of treatment. Supplementary Information The online version contains supplementary material available at 10.1186/s12883-022-02833-9.
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Affiliation(s)
- Ting Li
- Department of Neurology, Tianjin Neurological Institute, Tianjin Medical University General Hospital, No. 154 Anshan Road, Heping District, Tianjin, 300052, China.
| | - Yue Li
- Department of Neurology, Tianjin Neurological Institute, Tianjin Medical University General Hospital, No. 154 Anshan Road, Heping District, Tianjin, 300052, China
| | - Jia-Wen Li
- Department of Neurology, Tianjin Neurological Institute, Tianjin Medical University General Hospital, No. 154 Anshan Road, Heping District, Tianjin, 300052, China
| | - Ying-Hui Qin
- Department of Neurology, Tianjin Neurological Institute, Tianjin Medical University General Hospital, No. 154 Anshan Road, Heping District, Tianjin, 300052, China
| | - Hui Zhai
- Department of Neurology, Tianjin Neurological Institute, Tianjin Medical University General Hospital, No. 154 Anshan Road, Heping District, Tianjin, 300052, China
| | - Bin Feng
- Department of Neurology, Tianjin Neurological Institute, Tianjin Medical University General Hospital, No. 154 Anshan Road, Heping District, Tianjin, 300052, China
| | - He Li
- Department of Neurology, Tianjin Huanhu Hospital, Tianjin, China
| | - Ning-Nannan Zhang
- Department of Radiology and Tianjin Key Laboratory of Functional Imaging, School of Medical Imaging, Tianjin Medical University General Hospital, Tianjin Medical University, No. 154 Anshan Road, Heping District, Tianjin, 300052, China
| | - Chun-Sheng Yang
- Department of Neurology, Tianjin Neurological Institute, Tianjin Medical University General Hospital, No. 154 Anshan Road, Heping District, Tianjin, 300052, China.
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Pan J, Zheng W, Sun Y, Xu T. The long noncoding RNA LTCONS5539 up-regulates the TRAF6-mediated immune responses in miiuy croaker (Miichthys miiuy). FISH & SHELLFISH IMMUNOLOGY 2022; 126:263-270. [PMID: 35618171 DOI: 10.1016/j.fsi.2022.05.042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Revised: 04/29/2022] [Accepted: 05/19/2022] [Indexed: 06/15/2023]
Abstract
With the further study of long noncoding RNAs (lncRNAs), an increasing number of biological studies have demonstrated that lncRNAs are involved in various physiological processes, including cell proliferation, apoptosis, invasion, development and disease states. However, unlike mammals, little is known about the role of lncRNAs in the innate immunity of teleost fish. Here, we identify a lncRNA, named LTCONS5539, as critical role in the antiviral and antibacterial response of miiuy croaker and the results showed that lncRNA LTCONS5539 plays a critical regulatory role on TRAF6. Firstly, we found that LPS and poly(I:C) can up-regulate the expression of lncRNA LTCONS5539. Elevated lncRNA LTCONS5539 is capable of increasing the production of inflammatory factors and antiviral genes. Furthermore, the over-expression of lncRNA LTCONS5539 increases the expression of TRAF6 which was confirmed by qPCR and western blotting. On these foundations, we also proved that lncRNA LTCONS5539 modulates innate immunity through TRAF6-mediated immune responses through dual luciferase reporter assay. These results will help to further understand the immunomodulatory mechanisms of lncRNA in teleost fish.
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Affiliation(s)
- Jiajia Pan
- Laboratory of Fish Molecular Immunology, College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, China
| | - Weiwei Zheng
- Laboratory of Fish Molecular Immunology, College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, China
| | - Yuena Sun
- Laboratory of Fish Molecular Immunology, College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, China; Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources (Shanghai Ocean University), Ministry of Education, China; National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, China.
| | - Tianjun Xu
- Laboratory of Fish Molecular Immunology, College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, China; Laboratory of Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources (Shanghai Ocean University), Ministry of Education, China; National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, China.
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18
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Chen Y, An Q, Yang ST, Chen YL, Tong L, Ji LL. MicroRNA-124 attenuates PTSD-like behaviors and reduces the level of inflammatory cytokines by downregulating the expression of TRAF6 in the hippocampus of rats following single-prolonged stress. Exp Neurol 2022; 356:114154. [PMID: 35753367 DOI: 10.1016/j.expneurol.2022.114154] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Revised: 06/03/2022] [Accepted: 06/20/2022] [Indexed: 11/25/2022]
Abstract
BACKGROUND MicroRNA-124-3p (miR-124) plays an important role in neuroprotective functions in various neurological disorders, but whether miR-124 participates in the pathological progression of posttraumatic stress disorder (PTSD) remains poorly understood. METHODS In the present study, we assessed the level of neuroinflammation in the hippocampus of rats exposed to single-prolonged stress (SPS) by Western blot and immunofluorescence staining, while the effect of miR-124 on PTSD-like behaviors was evaluated by behavioral test. RESULTS Our results showed that the level of miR-124 in the hippocampus of rats exposed to SPS was downregulated and that the upregulation of miR-124 could alleviate the PTSD-like behaviors of SPS rats. This effect of miR-124 might be achieved through TNF receptor-associated Factor 6 (TRAF6), which is a target gene of miR-124 and plays an important role in the immune and inflammatory reaction by regulating nuclear factor kappa-B (NF-κB). Furthermore, we found that miR-124 not only decreased the level of proinflammatory cytokines but also increased the expression levels of synaptic proteins (PSD95 and synapsin I) and regulated the morphology of neurons. CONCLUSION These results suggested that miR-124 might attenuate PTSD-like behaviors and decrease the level of proinflammatory cytokines by downregulating the expression of TRAF6 in the hippocampus of rats exposed to SPS.
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Affiliation(s)
- Yao Chen
- Department of Anatomy, College of Basic Medical Sciences, China Medical University, Shenyang, China
| | - Qi An
- Department of Anatomy, College of Basic Medical Sciences, China Medical University, Shenyang, China
| | - Shu-Ting Yang
- Department of Anatomy, College of Basic Medical Sciences, China Medical University, Shenyang, China
| | - Yu-Lu Chen
- Department of Anatomy, College of Basic Medical Sciences, China Medical University, Shenyang, China
| | - Lei Tong
- Department of Anatomy, College of Basic Medical Sciences, China Medical University, Shenyang, China.
| | - Li-Li Ji
- Department of Anatomy, College of Basic Medical Sciences, China Medical University, Shenyang, China.
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Effect of TRAF6 in acute pancreatitis-induced intestinal barrier injury via TLR4/NF-κB signal pathway. Tissue Cell 2022; 76:101792. [DOI: 10.1016/j.tice.2022.101792] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 03/27/2022] [Accepted: 03/29/2022] [Indexed: 12/28/2022]
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20
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Min J, Li Q, Liu S, Wang Q, Yin M, Zhang Y, Yan J, Cui B, Liu S. TRAF6 Suppresses the Development of Pulmonary Fibrosis by Attenuating the Activation of Fibroblasts. Front Pharmacol 2022; 13:911945. [PMID: 35668944 PMCID: PMC9163739 DOI: 10.3389/fphar.2022.911945] [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: 04/03/2022] [Accepted: 05/03/2022] [Indexed: 11/13/2022] Open
Abstract
Pulmonary fibrosis (PF) has a high mortality rate, and its pathogenesis is unknown. TNF receptor-associated factor 6 (TRAF6), a signal transducer for inflammatory signaling, plays crucial roles in the pathogenesis of immune diseases. However, its function in PF remains unknown. Herein, we demonstrated that lungs from mice with bleomycin (BLM)-induced PF were characterized by decreased expression of TRAF6 in lung fibroblasts. Enhancing TRAF6 expression protected mice from BLM-induced PF coupled with a significant reduction in fibroblast differentiation. Furthermore, we demonstrated that overexpression of TRAF6 reversed the activation of myofibroblasts from PF mice by reducing the expression of Wnt3a and subsequently suppressing Wnt/β-catenin signaling. Additionally, the abundance of Tribbles pseudokinase 3 (TRIB3), a stress sensor, was negatively correlated with the abundance of TRAF6 in lung fibroblasts. TRIB3 overexpression decreased TRAF6 abundance by reducing TRAF6 stability in lung fibroblasts during PF. Mechanistic studies revealed that TRIB3 bound to TRAF6 and accelerated basal TRAF6 ubiquitination and degradation. Collectively, our data indicate that reduced TRAF6 expression in fibroblasts is essential for the progression of PF, and therefore, genetically increasing TRAF6 expression or disrupting the TRIB3-TRAF6 interaction could be potential therapeutic strategies for fibroproliferative lung diseases in clinical settings.
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Affiliation(s)
- Jiali Min
- National Clinical Research Center for Metabolic Diseases, Key Laboratory of Diabetes Immunology, Ministry of Education, Department of Metabolism and Endocrinology, The Second Xiangya Hospital of Central South University, Changsha, China
| | - Qiao Li
- National Clinical Research Center for Metabolic Diseases, Key Laboratory of Diabetes Immunology, Ministry of Education, Department of Metabolism and Endocrinology, The Second Xiangya Hospital of Central South University, Changsha, China
| | - Suosi Liu
- National Clinical Research Center for Metabolic Diseases, Key Laboratory of Diabetes Immunology, Ministry of Education, Department of Metabolism and Endocrinology, The Second Xiangya Hospital of Central South University, Changsha, China
| | - Qianrong Wang
- National Clinical Research Center for Metabolic Diseases, Key Laboratory of Diabetes Immunology, Ministry of Education, Department of Metabolism and Endocrinology, The Second Xiangya Hospital of Central South University, Changsha, China
| | - Min Yin
- National Clinical Research Center for Metabolic Diseases, Key Laboratory of Diabetes Immunology, Ministry of Education, Department of Metabolism and Endocrinology, The Second Xiangya Hospital of Central South University, Changsha, China
| | - Yan Zhang
- National Clinical Research Center for Metabolic Diseases, Key Laboratory of Diabetes Immunology, Ministry of Education, Department of Metabolism and Endocrinology, The Second Xiangya Hospital of Central South University, Changsha, China
| | - Jun Yan
- Beijing Institute of Brain Disorders, Capital Medical University, Beijing, China
| | - Bing Cui
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Shanshan Liu
- National Clinical Research Center for Metabolic Diseases, Key Laboratory of Diabetes Immunology, Ministry of Education, Department of Metabolism and Endocrinology, The Second Xiangya Hospital of Central South University, Changsha, China
- *Correspondence: Shanshan Liu,
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21
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The circular RNA circ_0099630/miR-940/receptor-associated factor 6 regulation cascade modulates the pathogenesis of periodontitis. J Dent Sci 2022; 17:1566-1576. [PMID: 36299308 PMCID: PMC9588814 DOI: 10.1016/j.jds.2022.04.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 04/06/2022] [Indexed: 11/21/2022] Open
Abstract
Background/purpose Materials and methods Results Conclusion
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22
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Min W, Wu Y, Fang Y, Hong B, Dai D, Zhou Y, Liu J, Li Q. Bone marrow mesenchymal stem cells-derived exosomal microRNA-124-3p attenuates hypoxic-ischemic brain damage through depressing tumor necrosis factor receptor associated factor 6 in newborn rats. Bioengineered 2022; 13:3194-3206. [PMID: 35067167 PMCID: PMC8973938 DOI: 10.1080/21655979.2021.2016094] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Mesenchymal stem cells (MSCs)-derived exosomes (Exo) are beneficial in the use of brain damages. Restrictively, the mechanism of Exo expressing miR-124-3p in hypoxic-ischemic brain damage (HIBD) is not completely comprehended. Thereupon, this work was put forward to reveal the action of bone marrow MSCs-derived Exo (BMSCs-Exo) expressing miR-124-3p in the illness. BMSCs were isolated and transfected with miR-124-3p agomir. Then, BMSCs-Exo were extracted and identified. The newborn HIBD rats were injected with miR-124-3p-modified BMSCs-Exo or tumor necrosis factor receptor associated factor 6 (TRAF6)-related vectors. Next, neurological functions, neuron pathological and structural damages, oxidative stress and neuronal apoptosis were observed. miR-124-3p and TRAF6 expression was tested, along with their targeting relationship. miR-124-3p was down-regulated, and TRAF6 was up-regulated in newborn HIBD rats. miR-124-3p targeted TRAF6. BMSCs-Exo improved neurological functions, alleviated neuron pathological and structural damages, suppressed oxidative stress and reduced neuronal apoptosis in newborn HIBD rats, whereas BMSCs-Exo-mediated effects were enhanced by restoring miR-124-3p. Silencing TRAF6 attenuated HIBD in newborn rats, but overexpression of TRAF6 reversed the protective role of miR-124-3p-overexpressing BMSCs-Exo. This work makes it comprehensive that up-regulated exosomal miR-124-3p ameliorates HIBD in newborn rats by targeting TRAF6, which replenishes the potential agents for curing HIBD.
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Affiliation(s)
| | | | | | - Bo Hong
- Changhai Stroke Center, Changhai Hospital, Second Military Medical University, Shanghai China
| | - Dongwei Dai
- Changhai Stroke Center, Changhai Hospital, Second Military Medical University, Shanghai China
| | - Yu Zhou
- Changhai Stroke Center, Changhai Hospital, Second Military Medical University, Shanghai China
| | - Jianmin Liu
- Changhai Stroke Center, Changhai Hospital, Second Military Medical University, Shanghai China
| | - Qiang Li
- Changhai Stroke Center, Changhai Hospital, Second Military Medical University, Shanghai China
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23
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Li F. LncRNA SNHG14 promoted inflammation of cerebral apoplexy by miR-124-3p/TRAF6 axis. Mol Cell Toxicol 2022. [DOI: 10.1007/s13273-021-00197-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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24
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Potjewyd FM, Axtman AD. Exploration of Aberrant E3 Ligases Implicated in Alzheimer's Disease and Development of Chemical Tools to Modulate Their Function. Front Cell Neurosci 2021; 15:768655. [PMID: 34867205 PMCID: PMC8637409 DOI: 10.3389/fncel.2021.768655] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 10/28/2021] [Indexed: 11/24/2022] Open
Abstract
The Ubiquitin Proteasome System (UPS) is responsible for the degradation of misfolded or aggregated proteins via a multistep ATP-dependent proteolytic mechanism. This process involves a cascade of ubiquitin (Ub) transfer steps from E1 to E2 to E3 ligase. The E3 ligase transfers Ub to a targeted protein that is brought to the proteasome for degradation. The inability of the UPS to remove misfolded or aggregated proteins due to UPS dysfunction is commonly observed in neurodegenerative diseases, such as Alzheimer's disease (AD). UPS dysfunction in AD drives disease pathology and is associated with the common hallmarks such as amyloid-β (Aβ) accumulation and tau hyperphosphorylation, among others. E3 ligases are key members of the UPS machinery and dysfunction or changes in their expression can propagate other aberrant processes that accelerate AD pathology. The upregulation or downregulation of expression or activity of E3 ligases responsible for these processes results in changes in protein levels of E3 ligase substrates, many of which represent key proteins that propagate AD. A powerful way to better characterize UPS dysfunction in AD and the role of individual E3 ligases is via the use of high-quality chemical tools that bind and modulate specific E3 ligases. Furthermore, through combining gene editing with recent advances in 3D cell culture, in vitro modeling of AD in a dish has become more relevant and possible. These cell-based models of AD allow for study of specific pathways and mechanisms as well as characterization of the role E3 ligases play in driving AD. In this review, we outline the key mechanisms of UPS dysregulation linked to E3 ligases in AD and highlight the currently available chemical modulators. We present several key approaches for E3 ligase ligand discovery being employed with respect to distinct classes of E3 ligases. Where possible, specific examples of the use of cultured neurons to delineate E3 ligase biology have been captured. Finally, utilizing the available ligands for E3 ligases in the design of proteolysis targeting chimeras (PROTACs) to degrade aberrant proteins is a novel strategy for AD, and we explore the prospects of PROTACs as AD therapeutics.
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25
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Qu J, Lin Z. Autophagy Regulation by Crosstalk between miRNAs and Ubiquitination System. Int J Mol Sci 2021; 22:ijms222111912. [PMID: 34769343 PMCID: PMC8585084 DOI: 10.3390/ijms222111912] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 10/27/2021] [Accepted: 11/01/2021] [Indexed: 12/12/2022] Open
Abstract
MicroRNAs (miRNAs) are non-coding single-stranded RNA molecules encoded by endogenous genes with ~22 nucleotides which are involved in the regulation of post-transcriptional gene expression. Ubiquitination and deubiquitination are common post-translational modifications in eukaryotic cells and important pathways in regulating protein degradation and signal transduction, in which E3 ubiquitin ligases and deubiquitinases (DUBs) play a decisive role. MiRNA and ubiquitination are involved in the regulation of most biological processes, including autophagy. Furthermore, in recent years, the direct interaction between miRNA and E3 ubiquitin ligases or deubiquitinases has attracted much attention, and the cross-talk between miRNA and ubiquitination system has been proved to play key regulatory roles in a variety of diseases. In this review, we summarized the advances in autophagy regulation by crosstalk between miRNA and E3 ubiquitin ligases or deubiquitinases.
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26
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Lin X, Liang Y, Herrera-Molina R, Montag D. Neuroplastin in Neuropsychiatric Diseases. Genes (Basel) 2021; 12:1507. [PMID: 34680901 PMCID: PMC8535836 DOI: 10.3390/genes12101507] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/20/2021] [Accepted: 09/21/2021] [Indexed: 02/07/2023] Open
Abstract
Molecular mechanisms underlying neuropsychiatric and neurodegenerative diseases are insufficiently elucidated. A detailed understanding of these mechanisms may help to further improve medical intervention. Recently, intellectual abilities, creativity, and amnesia have been associated with neuroplastin, a cell recognition glycoprotein of the immunoglobulin superfamily that participates in synapse formation and function and calcium signaling. Data from animal models suggest a role for neuroplastin in pathways affected in neuropsychiatric and neurodegenerative diseases. Neuroplastin loss or disruption of molecular pathways related to neuronal processes has been linked to various neurological diseases, including dementia, schizophrenia, and Alzheimer's disease. Here, we review the molecular features of the cell recognition molecule neuroplastin, and its binding partners, which are related to neurological processes and involved in learning and memory. The emerging functions of neuroplastin may have implications for the treatment of diseases, particularly those of the nervous system.
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Affiliation(s)
- Xiao Lin
- Neurogenetics Laboratory, Leibniz Institute for Neurobiology, Brenneckestr. 6, D-39118 Magdeburg, Germany; (X.L.); (Y.L.)
| | - Yi Liang
- Neurogenetics Laboratory, Leibniz Institute for Neurobiology, Brenneckestr. 6, D-39118 Magdeburg, Germany; (X.L.); (Y.L.)
| | - Rodrigo Herrera-Molina
- Combinatorial NeuroImaging (CNI), Leibniz Institute for Neurobiology, Brenneckestr. 6, D-39118 Magdeburg, Germany;
- Centro Integrativo de Biología y Química Aplicada, Universidad Bernardo O’Higgins, Santiago 8307993, Chile
- Center for Behavioral Brain Sciences (CBBS), D-39106 Magdeburg, Germany
| | - Dirk Montag
- Neurogenetics Laboratory, Leibniz Institute for Neurobiology, Brenneckestr. 6, D-39118 Magdeburg, Germany; (X.L.); (Y.L.)
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27
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Yang R, Li Z, Zou Y, Yang J, Li L, Xu X, Schmalzing G, Nie H, Li G, Liu S, Liang S, Xu C. Gallic Acid Alleviates Neuropathic Pain Behaviors in Rats by Inhibiting P2X7 Receptor-Mediated NF-κB/STAT3 Signaling Pathway. Front Pharmacol 2021; 12:680139. [PMID: 34512324 PMCID: PMC8423904 DOI: 10.3389/fphar.2021.680139] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Accepted: 07/30/2021] [Indexed: 11/13/2022] Open
Abstract
Neuropathic pain is a complex disease with high incidence. Adenosine triphosphate (ATP) and its activated P2X7 receptor are involved in the signal transmission of neuropathic pain. Gallic acid (3,4,5-trihydroxybenzoic acid) is a traditional Chinese medicine obtained from natural plants that exhibit anti-inflammatory, analgesic, and antitumor effects. However, the underlying mechanism for gallic acid in analgesia remains unknown. This study aims to reveal how gallic acid alleviates neuropathic pain behaviors in a rat model with chronic constriction injury (CCI). Real-time PCR, western blotting, double-label immunofluorescence, molecular docking, and whole-cell patch clamp technology were used to explore the therapeutic action of gallic acid on neuropathic pain. The results showed that after CCI rats were treated with gallic acid for 1 week, the mechanical withdrawal threshold and thermal withdrawal latency were increased, accompanied by inhibition of the upregulated expression of P2X7 and TNF-α at both mRNA and protein levels, and reduced NF-κB and phosphorylated-STAT3 in the dorsal root ganglia. At the same time, gallic acid significantly decreased the coexpression of P2X7 and glial fibrillary acidic protein in the dorsal root ganglia. In addition, gallic acid could suppress ATP-activated current in human embryonic kidney 293 (HEK293) cells transfected with the plasmid expressing P2X7 but had no effect on ATP activation current of P2X7-mutant plasmid (with the point mutation sequence of the key site where gallic acid binds to the P2X7 receptor). Therefore, our work suggests that gallic acid may alleviate neuropathic pain in CCI rats by inhibiting the P2X7 receptor and subsequent activation of the TNF-α/STAT3 signaling pathway.
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Affiliation(s)
- Runan Yang
- Neuropharmacology Laboratory of Physiology Department, Medical School of Nanchang University, Nanchang, China.,Jiangxi Provincial Key Laboratory of Autonomic Nervous Function and Disease, Nanchang, China
| | - Zijing Li
- Undergraduate Student at the Medical School of Nanchang University, Nanchang, China
| | - Yuting Zou
- Undergraduate Student at the Medical School of Nanchang University, Nanchang, China
| | - Jingjian Yang
- Undergraduate Student at the Medical School of Nanchang University, Nanchang, China
| | - Lin Li
- Neuropharmacology Laboratory of Physiology Department, Medical School of Nanchang University, Nanchang, China.,Jiangxi Provincial Key Laboratory of Autonomic Nervous Function and Disease, Nanchang, China
| | - Xiumei Xu
- Neuropharmacology Laboratory of Physiology Department, Medical School of Nanchang University, Nanchang, China.,Jiangxi Provincial Key Laboratory of Autonomic Nervous Function and Disease, Nanchang, China
| | - Günther Schmalzing
- Institute of Clinical Pharmacology, RWTH Aachen University, Aachen, Germany
| | - Hong Nie
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, College of Pharmacy, Jinan University, Guangzhou, China
| | - Guilin Li
- Neuropharmacology Laboratory of Physiology Department, Medical School of Nanchang University, Nanchang, China.,Jiangxi Provincial Key Laboratory of Autonomic Nervous Function and Disease, Nanchang, China
| | - Shuangmei Liu
- Neuropharmacology Laboratory of Physiology Department, Medical School of Nanchang University, Nanchang, China.,Jiangxi Provincial Key Laboratory of Autonomic Nervous Function and Disease, Nanchang, China
| | - Shangdong Liang
- Neuropharmacology Laboratory of Physiology Department, Medical School of Nanchang University, Nanchang, China.,Jiangxi Provincial Key Laboratory of Autonomic Nervous Function and Disease, Nanchang, China
| | - Changshui Xu
- Neuropharmacology Laboratory of Physiology Department, Medical School of Nanchang University, Nanchang, China.,Jiangxi Provincial Key Laboratory of Autonomic Nervous Function and Disease, Nanchang, China
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28
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Fang Y, Hong X. miR-124-3p Inhibits Microglial Secondary Inflammation After Basal Ganglia Hemorrhage by Targeting TRAF6 and Repressing the Activation of NLRP3 Inflammasome. Front Neurol 2021; 12:653321. [PMID: 34413820 PMCID: PMC8369369 DOI: 10.3389/fneur.2021.653321] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 06/28/2021] [Indexed: 11/13/2022] Open
Abstract
Objectives: Intracerebral hemorrhage (ICH) represents a serious central nervous system emergency with high morbidity and mortality, and the basal ganglia is the most commonly affected brain region. Differentially expressed microRNAs (miRs) have recently been highlighted to serve as potential diagnostic biomarkers and therapeutic targets for ICH. This study investigated the mechanism of miR-124-3p in microglial secondary inflammation after ICH. Methods: In this study, 48 patients with primary basal ganglia ICH and 48 healthy volunteers were selected and venous blood was collected from all patients on the second morning of admission (within 24 h of stroke onset). The expression of miR-124-3p in serum was detected by RT-qPCR. Three months after ICH, the patients were assessed by modified Rankin Scale (mRS), and the correlation between miR-124-3p expression and mRS score was analyzed by Pearson. The inflammatory response of microglia was induced by lipopolysaccharide (LPS) to establish the cell model of microglial inflammation. miR-124-3p expression patterns were detected in the serum of ICH patients and healthy volunteers, normal microglia, and LPS-induced microglia. The miR-124-3p mimic was transfected into LPS-induced microglia, followed by measurement of the inflammatory factors, apoptosis rate, and cell viability. The target gene of miR-124-3p was predicted and verified. The expression patterns of tumor necrosis factor receptor-associated factor 6 (TRAF6) were detected. pcDNA3.1 and pcDNA3.1-TRAF6 were transfected into LPS-induced HMC3 cells, and nucleotide-binding oligomerization domain-like receptor (NLR) pyrin domain-containing 3 (NLRP3) expression patterns were determined. Lastly, the effects of TRAF6 overexpression on apoptosis, cell viability, and inflammation in HMC3 cells were measured. Results: miR-124-3p was downregulated in the serum of basal ganglia ICH patients and LPS-induced microglia, and miR-124-3p expression was negatively correlated with mRS. Overexpression of miR-124-3p reduced the inflammatory factors and apoptosis rate and promoted cell activity in LPS-induced microglia. miR-124-3p was found to target TRAF6. Overexpression of TRAF6 enhanced the expression of NLRP3 inflammasome, inflammatory factors and apoptosis rate, and reduced cell viability. Conclusion: Our findings indicate that miR-124-3p repressed the activation of NLRP3 inflammasome by targeting TRAF6, thus inhibiting microglial secondary inflammation after ICH in basal ganglia.
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Affiliation(s)
- Yudan Fang
- Department of Neurology, Affiliated Hangzhou First People's Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Xiaoqin Hong
- Department of Neurology, Affiliated Hangzhou First People's Hospital, Zhejiang University School of Medicine, Hangzhou, China
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29
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Kane EI, Waters KL, Spratt DE. Intersection of Redox Chemistry and Ubiquitylation: Post-Translational Modifications Required for Maintaining Cellular Homeostasis and Neuroprotection. Cells 2021; 10:2121. [PMID: 34440890 PMCID: PMC8394436 DOI: 10.3390/cells10082121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 08/09/2021] [Accepted: 08/12/2021] [Indexed: 12/15/2022] Open
Abstract
Neurodegeneration has been predominantly recognized as neuronal breakdown induced by the accumulation of aggregated and/or misfolded proteins and remains a preliminary factor in age-dependent disease. Recently, critical regulating molecular mechanisms and cellular pathways have been shown to induce neurodegeneration long before aggregate accumulation could occur. Although this opens the possibility of identifying biomarkers for early onset diagnosis, many of these pathways vary in their modes of dysfunction while presenting similar clinical phenotypes. With selectivity remaining difficult, it is promising that these neuroprotective pathways are regulated through the ubiquitin-proteasome system (UPS). This essential post-translational modification (PTM) involves the specific attachment of ubiquitin onto a substrate, specifically marking the ubiquitin-tagged protein for its intracellular fate based upon the site of attachment, the ubiquitin chain type built, and isopeptide linkages between different ubiquitin moieties. This review highlights both the direct and indirect impact ubiquitylation has in oxidative stress response and neuroprotection, and how irregularities in these intricate processes lead towards the onset of neurodegenerative disease (NDD).
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Affiliation(s)
| | | | - Donald E. Spratt
- Gustaf H. Carlson School of Chemistry and Biochemistry, Clark University, 950 Main St., Worcester, MA 01610, USA; (E.I.K.); (K.L.W.)
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30
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Deng HJ, Deji Q, Zhaba W, Liu JQ, Gao SQ, Han YL, Zhou ML, Wang CX. A20 Establishes Negative Feedback With TRAF6/NF-κB and Attenuates Early Brain Injury After Experimental Subarachnoid Hemorrhage. Front Immunol 2021; 12:623256. [PMID: 34381441 PMCID: PMC8350325 DOI: 10.3389/fimmu.2021.623256] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Accepted: 04/09/2021] [Indexed: 11/13/2022] Open
Abstract
Nuclear factor (NF)-κB-ty -50mediated neuroinflammation plays a crucial role in early brain injury (EBI) after subarachnoid hemorrhage (SAH). As an important negative feedback regulator of NF-κB, A20 is essential for inflammatory homeostasis. Herein, we tested the hypothesis that A20 attenuates EBI by establishing NF-κB-associated negative feedback after experimental SAH. In vivo and in vitro models of SAH were established. TPCA-1 and lentivirus were used for NF-κB inhibition and A20 silencing/overexpression, respectively. Cellular localization of A20 in the brain was determined via immunofluorescence. Western blotting and enzyme-linked immunosorbent assays were applied to observe the expression of members of the A20/tumor necrosis factor receptor-associated factor 6 (TRAF6)/NF-κB pathway and inflammatory cytokines (IL-6, IL-1β, TNF-α). Evans blue staining, TUNEL staining, Nissl staining, brain water content, and modified Garcia score were performed to evaluate the neuroprotective effect of A20. A20 expression by astrocytes, microglia, and neurons was increased at 24 h after SAH. A20 and inflammatory cytokine levels were decreased while TRAF6 expression was elevated after NF-κB inhibition. TRAF6, NF-κB, and inflammatory cytokine levels were increased after A20 silencing but suppressed with A20 overexpression. Also, Bcl-2, Bax, MMP-9, ZO-1 protein levels; Evans blue, TUNEL, and Nissl staining; brain water content; and modified Garcia score showed that A20 exerted a neuroprotective effect after SAH. A20 expression was regulated by NF-κB. In turn, increased A20 expression inhibited TRAF6 and NF-κB to reduce the subsequent inflammatory response. Our data also suggest that negative feedback regulation mechanism of the A20/TRAF6/NF-κB pathway and the neuroprotective role of A20 to attenuate EBI after SAH.
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Affiliation(s)
- Hong-Ji Deng
- Department of Neurosurgery, The First Affiliated Hospital, Guangxi Medical University, Nanning, China
| | - QuZhen Deji
- Department of Ophthalmology, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - WangDui Zhaba
- Department of Neurosurgery, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Jia-Qiang Liu
- Department of Neurosurgery, Yijishan Hospital, Wannan Medical College, Wuhu, China
| | - Sheng-Qing Gao
- Department of Neurosurgery, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Yan-Ling Han
- Department of Neurosurgery, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Meng-Liang Zhou
- Department of Neurosurgery, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Chun-Xi Wang
- Department of Neurosurgery, The First Affiliated Hospital, Guangxi Medical University, Nanning, China
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Cheng J, Deng Y, Zhou J. Role of the Ubiquitin System in Chronic Pain. Front Mol Neurosci 2021; 14:674914. [PMID: 34122010 PMCID: PMC8194701 DOI: 10.3389/fnmol.2021.674914] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 04/12/2021] [Indexed: 01/02/2023] Open
Abstract
As a significant public health issue, chronic pain, mainly neuropathic pain (NP) and inflammatory pain, has a severe impact. The underlying mechanisms of chronic pain are enigmatic at present. The roles of ubiquitin have been demonstrated in various physiological and pathological conditions and underscore its potential as therapeutic targets. The dysfunction of the component of the ubiquitin system that occurs during chronic pain is rapidly being discovered. These results provide insight into potential molecular mechanisms of chronic pain. Chronic pain is regulated by ubiquitination, SUMOylation, ubiquitin ligase, and deubiquitinating enzyme (DUB), etc. Insight into the mechanism of the ubiquitin system regulating chronic pain might contribute to relevant therapeutic targets and the development of novel analgesics.
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Affiliation(s)
| | | | - Jun Zhou
- Department of Anesthesiology, The Third Affiliated Hospital of Southern Medical University, Guangzhou, China
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Huang H, Xia A, Sun L, Lu C, Liu Y, Zhu Z, Wang S, Cai J, Zhou X, Liu S. Pathogenic Functions of Tumor Necrosis Factor Receptor- Associated Factor 6 Signaling Following Traumatic Brain Injury. Front Mol Neurosci 2021; 14:629910. [PMID: 33967693 PMCID: PMC8096983 DOI: 10.3389/fnmol.2021.629910] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 03/29/2021] [Indexed: 01/25/2023] Open
Abstract
Neuroinflammation contributes to delayed (secondary) neurodegeneration following traumatic brain injury (TBI). Tumor necrosis factor receptor-associated factor 6 (TRAF6) signaling may promote post-TBI neuroinflammation, thereby exacerbating secondary injury. This study investigated the pathogenic functions of TRAF6 signaling following TBI in vivo and in vitro. A rat TBI model was established by air pressure contusion while lipopolysaccharide (LPS) exposure was used to induce inflammatory-like responses in cultured astrocytes. Model rats were examined for cell-specific expression of TRAF6, NF-κB, phosphorylated (p)-NF-κB, MAPKs (ERK, JNK, and p38), p-MAPKs, chemokines (CCL2 and CXCL1), and chemokine receptors (CCR2 and CXCR2) by immunofluorescence, RT-qPCR, western blotting, and ELISA, for apoptosis by TUNEL staining, and spatial cognition by Morris water maze testing. These measurements were compared between TBI model rats receiving intracerebral injections of TRAF6-targeted RNAi vector (AAV9-TRAF6-RNAi), empty vector, MAPK/NF-κB inhibitors, or vehicle. Primary astrocytes were stimulated with LPS following TRAF6 siRNA or control transfection, and NF-κB, MAPKs, chemokine, and chemokine receptor expression levels evaluated by western blotting and ELISA. TRAF6 was expressed mainly in astrocytes and neurons of injured cortex, peaking 3 days post-TBI. Knockdown by AAV9-TRAF6-RNAi improved spatial learning and memory, decreased TUNEL-positive cell number in injured cortex, and downregulated expression levels of p-NF-κB, p-ERK, p-JNK, p-p38, CCL2, CCR2, CXCL1, and CXCR2 post-TBI. Inhibitors of NF-κB, ERK, JNK, and p38 significantly suppressed CCL2, CCR2, CXCL1, and CXCR2 expression following TBI. Furthermore, TRAF6-siRNA inhibited LPS-induced NF-κB, ERK, JNK, p38, CCL2, and CXCL1 upregulation in cultured astrocytes. Targeting TRAF6-MAPKs/NF-κB-chemokine signaling pathways may provide a novel therapeutic approach for reducing post-TBI neuroinflammation and concomitant secondary injury.
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Affiliation(s)
- Huan Huang
- Department of Rehabilitation Medicine, Affiliated Hospital of Nantong University, Nantong, China.,School of Medicine, Nantong University, Nantong, China
| | - Anqi Xia
- Department of Rehabilitation Medicine, Affiliated Hospital of Nantong University, Nantong, China.,School of Medicine, Nantong University, Nantong, China
| | - Li Sun
- Department of Rehabilitation Medicine, Affiliated Hospital of Nantong University, Nantong, China
| | - Chun Lu
- Department of Rehabilitation Medicine, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai, China
| | - Ying Liu
- Department of Pathology, Affiliated Hospital of Nantong University, Nantong, China
| | - Zhenjie Zhu
- Department of Rehabilitation Medicine, Affiliated Hospital of Nantong University, Nantong, China
| | - Siye Wang
- Department of Rehabilitation Medicine, Affiliated Hospital of Nantong University, Nantong, China
| | - Junyan Cai
- Department of Rehabilitation Medicine, Affiliated Hospital of Nantong University, Nantong, China
| | - Xiaoyun Zhou
- Department of Rehabilitation Medicine, Affiliated Hospital of Nantong University, Nantong, China
| | - Su Liu
- Department of Rehabilitation Medicine, Affiliated Hospital of Nantong University, Nantong, China
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Yan M, Fu Y, Rao H, Zhou H, Liang X. Expression and Clinical Significance of miR-146a and Tumor Necrosis Factor Receptor-Associated Factor 6 (TRAF6) in Myasthenia Gravis Patient Serum. BIOMED RESEARCH INTERNATIONAL 2021; 2021:5573469. [PMID: 33997016 PMCID: PMC8081603 DOI: 10.1155/2021/5573469] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 03/30/2021] [Accepted: 04/08/2021] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To investigate the expression and clinical significance of miR-146a and tumor necrosis factor receptor-associated factor 6 (TRAF6) in myasthenia gravis (MG) patient serum. METHODS The serum of 52 patients with MG and 60 healthy individuals was collected in our hospital. The expression of miR-146a and TRAF6 in serum was measured by real-time PCR (RT-PCR). Comparison among serum miR-146a and TRAF6 mRNA group clinical characteristics and assorted expressions was done with the correlation among the two groups evaluated. Logistics regression was used to analyze the effect of miR-146a and TRAF6 mRNA on MG development with the ROC curve applied for an investigation into the diagnostic role of miR-146a and TRAF6 mRNA expression in MG development. RESULTS miR-146a and TRAF6 mRNA were significantly increased in the patients with MG compared with the healthy controls. Significant differences were identified in respiratory muscle endurance, muscle weakness level, vital capacity, and maximal voluntary ventilation between the two groups. Additionally, correlation analysis has discovered a positive correlation between miR-146a and TRAF mRNA expression in patients with MG. miR-146a and TRAF6 mRNA are independent MG occurrence factors exhibited by multivariate analysis while areas under ROC curve (AUCs) of miR-146a and TRAF6 mRNA in MG diagnosis were established by ROC curve analysis with results being 0.782 and 0.703, correspondingly. CONCLUSION miR-146a and TRAF6 mRNA are highly expressed in MG patients and can affect MG occurrence. miR-146a is a suitable candidate marker for diagnosing MG.
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Affiliation(s)
- Mei Yan
- Department of General Medicine, Foshan First People's Hospital, Foshan City, Guangdong Province, 528000, China
| | - Yue Fu
- Department of General Medicine, Foshan First People's Hospital, Foshan City, Guangdong Province, 528000, China
| | - Hui Rao
- Department of General Medicine, Foshan First People's Hospital, Foshan City, Guangdong Province, 528000, China
| | - Huiling Zhou
- Department of Infectious Disease, Foshan First People's Hospital, Foshan City, Guangdong Province, 528000, China
| | - Xiaohuang Liang
- Department of General Medicine, Foshan First People's Hospital, Foshan City, Guangdong Province, 528000, China
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TRAF6 Contributes to CFA-Induced Spinal Microglial Activation and Chronic Inflammatory Pain in Mice. Cell Mol Neurobiol 2021; 42:1543-1555. [PMID: 33694132 DOI: 10.1007/s10571-021-01045-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 01/15/2021] [Indexed: 12/23/2022]
Abstract
Tumor necrosis factor receptor-associated factor 6 (TRAF6) has been reported to be expressed in spinal astrocytes and is involved in neuropathic pain. In this study, we investigated the role and mechanism of TRAF6 in complete Freund's adjuvant (CFA)-evoked chronic inflammatory hypersensitivity and the effect of docosahexaenoic acid (DHA) on TRAF6 expression and inflammatory pain. We found that TRAF6 was dominantly increased in microglia at the spinal level after intraplantar injection of CFA. Intrathecal TRAF6 siRNA alleviated CFA-triggered allodynia and reversed the upregulation of IBA-1 (microglia marker). In addition, intrathecal administration of DHA inhibited CFA-induced upregulation of TRAF6 and IBA-1 in the spinal cord and attenuated CFA-evoked mechanical allodynia. Furthermore, DHA prevented lipopolysaccharide (LPS)-caused increase of TRAF6 and IBA-1 in both BV2 cell line and primary cultured microglia. Finally, intrathecal DHA reduced LPS-induced upregulation of spinal TRAF6 and IBA-1, and alleviated LPS-induced mechanical allodynia. Our findings indicate that TRAF6 contributes to pain hypersensitivity via regulating microglial activation in the spinal dorsal horn. Direct inhibition of TRAF6 by siRNA or indirect inhibition by DHA may have therapeutic effects on chronic inflammatory pain.
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Liu N, Sun H, Li X, Cao W, Peng A, Dong S, Yu Z. Downregulation of lncRNA KCNQ1OT1 relieves traumatic brain injury induced neurological deficits via promoting "M2" microglia polarization. Brain Res Bull 2021; 171:91-102. [PMID: 33713751 DOI: 10.1016/j.brainresbull.2021.03.004] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 02/01/2021] [Accepted: 03/08/2021] [Indexed: 12/30/2022]
Abstract
BACKGROUND Microglia-induced neuroinflammation is one of the main characteristics of traumatic brain injury (TBI). Presently, we aim to investigate the role of long non-coding RNA (lncRNA) KCNQ1 overlapping transcript 1 (KCNQ1OT1) in TBI-induced neurological deficits and the related mechanism. METHODS An in-vivo TBI model was established in mice, and in-vitro experiments were carried out on BV2 microglia. Then the neurological functions, microglial activation, inflammatory cytokines, and proteins were detected. RESULTS Our data indicated that KCNQ1OT1 was markedly overexpressed in the cerebral tissues of TBI mice, accompanied by a higher level of the cytokines (including IL-1β, IL-6, and TNFα). However, knocking down KCNQ1OT1 relieved neurological deficits, neuron loss, and blood-brain barrier damage. Besides, overexpressing miR-873-5p enhanced the "M2″ polarization of microglia by repressing the TRAF6-mediated p38 and NF-κB pathways. In contrast, downregulating KCNQ1OT1 repressed microglial neuroinflammation by attenuating the "M1″ polarization of microglia and promoting "M2″ polarization of microglia, and inactivating the p38 and NF-κB pathway. CONCLUSIONS Mechanistically, KCNQ1OT1 functioned as a competitive endogenous RNA (ceRNA) by sponging miR-873-5p, which targeted the 3' untranslated region (UTR) of TRAF6. Overall, our data confirmed that downregulating lncRNA KCNQ1OT1 exerted neuroprotective effects on TBI mice by modulating the miR-873-5p-TRAF6-p38/NF-κB axis.
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Affiliation(s)
- Na Liu
- Department of Neurology, The First People's Hospital of Zhenjiang, Zhenjiang, 212000, Jiangsu, China.
| | - Haiyan Sun
- Department of Neurology, Jilin Provincial FAW General Hospital, Changchun, 130000, Jilin, China
| | - Xuezhong Li
- Department of Neurology, The First People's Hospital of Zhenjiang, Zhenjiang, 212000, Jiangsu, China
| | - Wei Cao
- Department of Neurology, The First People's Hospital of Zhenjiang, Zhenjiang, 212000, Jiangsu, China
| | - Aini Peng
- Department of Neurology, The First People's Hospital of Zhenjiang, Zhenjiang, 212000, Jiangsu, China
| | - Suyan Dong
- Department of Neurology, The First People's Hospital of Zhenjiang, Zhenjiang, 212000, Jiangsu, China
| | - Zhixin Yu
- ICU, The First People's Hospital of Zhenjiang, Zhenjiang, 212000, Jiangsu, China
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Song G, Zhang Y, Tian J, Ma J, Yin K, Xu H, Wang S. TRAF6 Regulates the Immunosuppressive Effects of Myeloid-Derived Suppressor Cells in Tumor-Bearing Host. Front Immunol 2021; 12:649020. [PMID: 33717204 PMCID: PMC7946975 DOI: 10.3389/fimmu.2021.649020] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2021] [Accepted: 02/04/2021] [Indexed: 12/12/2022] Open
Abstract
Myeloid-derived suppressor cells (MDSCs) are immature heterogeneous cells derived from the bone marrow and they are the major component of the tumor-induced immunosuppressive environment. Tumor necrosis factor receptor-associated factor 6 (TRAF6), an E3 ubiquitin ligase, catalyzes the polyubiquitination of target proteins. TRAF6 plays a critical role in modulating the immune system. However, whether TRAF6 is involved in the regulation of MDSCs has not been thoroughly elucidated to date. In this study, we found that the expression of TRAF6 in MDSCs derived from tumor tissue was significantly upregulated compared with that of MDSCs from spleen of tumor-bearing mice. Knockdown of TRAF6 remarkably attenuated the immunosuppressive effects of MDSCs. Mechanistically, TRAF6 might improve the immunosuppression of MDSCs by mediating K63-linked polyubiquitination and phosphorylation of signal transducer and activator of transcription 3 (STAT3). Additionally, it was discovered that the accumulation of MDSCs was abnormal in peripheral blood of lung cancer patients. TRAF6 and arginase 1 were highly expressed in MDSCs of patients with lung cancer. Taken together, our study demonstrated that TRAF6 participates in promoting the immunosuppressive function of MDSCs and provided a potential target for antitumor immunotherapy.
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Affiliation(s)
- Ge Song
- Department of Laboratory Medicine, Affiliated People's Hospital, Jiangsu University, Zhenjiang, China
- Institute of Laboratory Medicine, Jiangsu Key Laboratory for Laboratory Medicine, Jiangsu University School of Medicine, Zhenjiang, China
| | - Yue Zhang
- Department of Laboratory Medicine, Affiliated People's Hospital, Jiangsu University, Zhenjiang, China
| | - Jie Tian
- Institute of Laboratory Medicine, Jiangsu Key Laboratory for Laboratory Medicine, Jiangsu University School of Medicine, Zhenjiang, China
| | - Jie Ma
- Institute of Laboratory Medicine, Jiangsu Key Laboratory for Laboratory Medicine, Jiangsu University School of Medicine, Zhenjiang, China
| | - Kai Yin
- Department of General Surgery, Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Huaxi Xu
- Institute of Laboratory Medicine, Jiangsu Key Laboratory for Laboratory Medicine, Jiangsu University School of Medicine, Zhenjiang, China
| | - Shengjun Wang
- Department of Laboratory Medicine, Affiliated People's Hospital, Jiangsu University, Zhenjiang, China
- Institute of Laboratory Medicine, Jiangsu Key Laboratory for Laboratory Medicine, Jiangsu University School of Medicine, Zhenjiang, China
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A LRRK2 GTP Binding Inhibitor, 68, Reduces LPS-Induced Signaling Events and TNF-α Release in Human Lymphoblasts. Cells 2021; 10:cells10020480. [PMID: 33672296 PMCID: PMC7926966 DOI: 10.3390/cells10020480] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 02/05/2021] [Accepted: 02/16/2021] [Indexed: 12/19/2022] Open
Abstract
Mutations in the leucine-rich repeat kinase-2 (LRRK2) gene cause autosomal-dominant Parkinson’s disease (PD) and contribute to sporadic PD. Common genetic variation in LRRK2 modifies susceptibility to immunological disorders including Crohn’s disease and leprosy. Previous studies have reported that LRRK2 is expressed in B lymphocytes and macrophages, suggesting a role for LRRK2 in immunological functions. In this study, we characterized the LRRK2 protein expression and phosphorylation using human lymphoblasts. Lipopolysaccharide (LPS), a proinflammatory agent, induced the increase of LRRK2 expression and kinase activities in human lymphoblasts in a time-dependent manner. Moreover, LPS activated the Toll-like receptor (TLR) signaling pathway, increased TRAF6/LRRK2 interaction, and elevated the phosphorylation levels of MAPK (JNK1/2, p38, and ERK1/2) and IkBα. Treatment with LRRK2 inhibitor 68 reduced LPS-induced TRAF6/LRRK2 interaction and MAPK and IkBα phosphorylation, thereby reducing TNF-α secretion. These results indicate that LRRK2 is actively involved in proinflammatory responses in human lymphoblasts, and inhibition of GTP binding by 68 results in an anti-inflammation effect against proinflammatory stimuli. These findings not only provide novel insights into the mechanisms of LRRK2-linked immune and inflammatory responses in B-cell-like lymphoblasts, but also suggest that 68 may also have potential therapeutic value for LRRK2-linked immunological disorders.
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Weng RX, Chen W, Tang JN, Sun Q, Li M, Xu X, Zhang PA, Zhang Y, Hu CY, Xu GY. Targeting spinal TRAF6 expression attenuates chronic visceral pain in adult rats with neonatal colonic inflammation. Mol Pain 2021; 16:1744806920918059. [PMID: 32299285 PMCID: PMC7168780 DOI: 10.1177/1744806920918059] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Background Irritable bowel syndrome is one of the most common gastrointestinal disorders. It is featured by abdominal pain in conjunction with altered bowel habits. However, the pathophysiology of the syndrome remains largely unknown. Tumor necrosis factor receptor-associated factor 6 (TRAF6) has been reported to be involved in neuropathic pain. The aim of this study was to investigate roles and mechanisms of TRAF6 in the chronic visceral hypersensitivity. Methods Visceral hypersensitivity was induced by neonatal colonic inflammation and was identified by colorectal distention. The protein level, RNA level, and cellular distribution of TRAF6 and its related molecules were detected with Western blot, quantitative polymerase chain reaction, and immunofluorescence. In vitro spinal cord slice recording technique was performed to determine the synaptic transmission activities. Results Neonatal colonic inflammation rats displayed visceral hypersensitivity at the age of six weeks. The expression of TRAF6 was obviously upregulated in spinal cord dorsal horn of neonatal colonic inflammation rats at the age of six weeks. Immunofluorescence study showed that TRAF6 was dominantly expressed in spinal astrocytes. Intrathecal injection of TRAF6 small interfering RNA (siRNA) significantly reduced the amplitude of spontaneous excitatory postsynaptic currents at the spinal dorsal horn level. Furthermore, knockdown of TRAF6 led to a significant downregulation of cystathionine β synthetase expression in the spinal dorsal horn of neonatal colonic inflammation rats. Importantly, intrathecal injection of TRAF6 siRNA remarkably alleviated visceral hypersensitivity of neonatal colonic inflammation rats. Conclusions Our results suggested that the upregulation of TRAF6 contributed to visceral pain hypersensitivity, which is likely mediated by regulating cystathionine β synthetase expression in the spinal dorsal horn. Our findings suggest that TRAF6 might act as a potential target for the treatment of chronic visceral pain in irritable bowel syndrome patients.
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Affiliation(s)
- Rui-Xia Weng
- Jiangsu Key Laboratory of Neuropsychiatric Diseases, Institute of Neuroscience, The Second Affiliated Hospital of Soochow University, Suzhou, P.R. China
| | - Wei Chen
- People's Hospital of Suzhou National New & Hi-Tech Industrial Development Zone, Suzhou, P.R. China
| | - Jia-Ni Tang
- Jiangsu Key Laboratory of Neuropsychiatric Diseases, Institute of Neuroscience, The Second Affiliated Hospital of Soochow University, Suzhou, P.R. China
| | - Qian Sun
- Jiangsu Key Laboratory of Neuropsychiatric Diseases, Institute of Neuroscience, The Second Affiliated Hospital of Soochow University, Suzhou, P.R. China
| | - Meng Li
- Jiangsu Key Laboratory of Neuropsychiatric Diseases, Institute of Neuroscience, The Second Affiliated Hospital of Soochow University, Suzhou, P.R. China
| | - Xue Xu
- People's Hospital of Suzhou National New & Hi-Tech Industrial Development Zone, Suzhou, P.R. China
| | - Ping-An Zhang
- Jiangsu Key Laboratory of Neuropsychiatric Diseases, Institute of Neuroscience, The Second Affiliated Hospital of Soochow University, Suzhou, P.R. China
| | - Ying Zhang
- People's Hospital of Suzhou National New & Hi-Tech Industrial Development Zone, Suzhou, P.R. China
| | - Chuang-Ying Hu
- Jiangsu Key Laboratory of Neuropsychiatric Diseases, Institute of Neuroscience, The Second Affiliated Hospital of Soochow University, Suzhou, P.R. China
| | - Guang-Yin Xu
- Jiangsu Key Laboratory of Neuropsychiatric Diseases, Institute of Neuroscience, The Second Affiliated Hospital of Soochow University, Suzhou, P.R. China
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Wan SY, Li GS, Tu C, Chen WL, Wang XW, Wang YN, Peng LB, Tan F. MicroNAR-194-5p hinders the activation of NLRP3 inflammasomes and alleviates neuroinflammation during intracerebral hemorrhage by blocking the interaction between TRAF6 and NLRP3. Brain Res 2021; 1752:147228. [PMID: 33385377 DOI: 10.1016/j.brainres.2020.147228] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 11/25/2020] [Accepted: 12/02/2020] [Indexed: 12/14/2022]
Abstract
The possible role of miR-194-5p in brain and neurodegenerative diseases has been reported, but its role in intracerebral hemorrhage (ICH) has not been studied. This study estimated the mechanism of miR-194-5p in ICH. ICH rat model was established by injecting collagenase type VII. miR-194-5p expression in brain tissue of ICH rats was overexpressed by injection of miR-194-5p agomir. Then neurological function score and brain water content were measured. The morphological changes of brain tissue and neuronal apoptosis were evaluated by histological staining. Levels of NLRP3 inflammasomes, IL-1β and IL-18 were measured. The target relation between miR-194-5p and TRAF6 was verified and the binding of TRAF6 to NLRP3 was explored. miR-194-5p was decreased in ICH rats. After overexpression of miR-194-5p, the neuropathological injury in ICH rats was significantly reduced, and NLRP3-mediated inflammatory injury was inhibited. miR-194-5p targeted TRAF6. TRAF6 interacted with NLRP3 to promote the activation of NLRP3 inflammasomes. Overexpression of miR-194-5p reduced the interaction between TRAF6 and NLRP3, thereby alleviating the neuroinflammation. Collectively, overexpression of miR-194-5p reduced the TRAF6/NLRP3 interaction, thus inhibiting the activation of NLRP3 inflammasomes and reducing neuroinflammation during ICH. This study may shed new light on ICH treatment.
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Affiliation(s)
- Sai-Ying Wan
- Department of Neurology, Foshan Hospital of Traditional Chinese Medicine of Guangdong Province, China
| | - Gui-Su Li
- Department of Neurology, Shenzhen Longhua District People's Hospital, China
| | - Chen Tu
- Department of Bone, Foshan Hospital of Traditional Chinese Medicine of Guangdong Province, China
| | - Wen-Lin Chen
- Department of Neurology, Foshan Hospital of Traditional Chinese Medicine of Guangdong Province, China
| | - Xue-Wen Wang
- Department of Neurology, Foshan Hospital of Traditional Chinese Medicine of Guangdong Province, China
| | - Yun-Nan Wang
- Department of Neurology, Foshan Hospital of Traditional Chinese Medicine of Guangdong Province, China
| | - Lie-Biao Peng
- Department of Neurology, Foshan Hospital of Traditional Chinese Medicine of Guangdong Province, China
| | - Feng Tan
- Department of Neurology, Foshan Hospital of Traditional Chinese Medicine of Guangdong Province, China.
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Srivastav A, Medhi S, Narvekar S. Repurposing of a muscle relaxant drug thiocolchicoside as an anticancer agent. MGM JOURNAL OF MEDICAL SCIENCES 2021. [DOI: 10.4103/mgmj.mgmj_87_20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Mechanism by which TRAF6 Participates in the Immune Regulation of Autoimmune Diseases and Cancer. BIOMED RESEARCH INTERNATIONAL 2020; 2020:4607197. [PMID: 33294443 PMCID: PMC7714562 DOI: 10.1155/2020/4607197] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 11/06/2020] [Accepted: 11/17/2020] [Indexed: 11/24/2022]
Abstract
Tumor necrosis factor (TNF) receptor-associated factor 6 (TRAF6), an E3 ubiquitin ligase, is a signal transduction molecule shared by the interleukin-1 receptor (IL-1R)/Toll-like receptor (TLR) family and the TNFR superfamily. TRAF6 has a unique TRAF domain and RING finger domain that mediate intracellular signaling events. In the immune system, TRAF6-mediated signaling has been shown to be critical for the development, homeostasis, and activation of a variety of immune cells, including B cells, T cells, dendritic cells, and macrophages. Although the pathogenesis and etiology of autoimmune diseases and cancer are not fully understood, it is worth noting that existing studies have shown that TRAF6 is involved in the pathogenesis and development of a variety of these diseases. Herein, we reviewed the role of TRAF6 in certain immune cells, as well as the function and potential effect of TRAF6 in autoimmune diseases and cancer. Our review indicates that TRAF6 may be a novel target for autoimmune diseases and cancer.
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Vemula SK, Malci A, Junge L, Lehmann AC, Rama R, Hradsky J, Matute RA, Weber A, Prigge M, Naumann M, Kreutz MR, Seidenbecher CI, Gundelfinger ED, Herrera-Molina R. The Interaction of TRAF6 With Neuroplastin Promotes Spinogenesis During Early Neuronal Development. Front Cell Dev Biol 2020; 8:579513. [PMID: 33363141 PMCID: PMC7755605 DOI: 10.3389/fcell.2020.579513] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 11/11/2020] [Indexed: 11/22/2022] Open
Abstract
Correct brain wiring depends on reliable synapse formation. Nevertheless, signaling codes promoting synaptogenesis are not fully understood. Here, we report a spinogenic mechanism that operates during neuronal development and is based on the interaction of tumor necrosis factor receptor-associated factor 6 (TRAF6) with the synaptic cell adhesion molecule neuroplastin. The interaction between these proteins was predicted in silico and verified by co-immunoprecipitation in extracts from rat brain and co-transfected HEK cells. Binding assays show physical interaction between neuroplastin’s C-terminus and the TRAF-C domain of TRAF6 with a Kd value of 88 μM. As the two proteins co-localize in primordial dendritic protrusions, we used young cultures of rat and mouse as well as neuroplastin-deficient mouse neurons and showed with mutagenesis, knock-down, and pharmacological blockade that TRAF6 is required by neuroplastin to promote early spinogenesis during in vitro days 6-9, but not later. Time-framed TRAF6 blockade during days 6–9 reduced mEPSC amplitude, number of postsynaptic sites, synapse density and neuronal activity as neurons mature. Our data unravel a new molecular liaison that may emerge during a specific window of the neuronal development to determine excitatory synapse density in the rodent brain.
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Affiliation(s)
- Sampath Kumar Vemula
- Laboratory of Synaptic Signaling, Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Ayse Malci
- Laboratory of Synaptic Signaling, Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Lennart Junge
- Laboratory of Synaptic Signaling, Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Anne-Christin Lehmann
- Laboratory of Synaptic Signaling, Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Ramya Rama
- Laboratory of Synaptic Signaling, Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Johannes Hradsky
- Laboratory of Synaptic Signaling, Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Ricardo A Matute
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, United States.,Centro Integrativo de Biología y Química Aplicada, Universidad Bernardo O'Higgins, Santiago, Chile
| | - André Weber
- Laboratory of Synaptic Signaling, Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Matthias Prigge
- Laboratory of Synaptic Signaling, Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Michael Naumann
- Institute of Experimental Internal Medicine, Medical Faculty, Otto von Guericke University, Magdeburg, Germany
| | - Michael R Kreutz
- Laboratory of Synaptic Signaling, Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany.,Leibniz Group 'Dendritic Organelles and Synaptic Function', Center for Molecular Neurobiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Constanze I Seidenbecher
- Laboratory of Synaptic Signaling, Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany.,Center for Behavioral Brain Sciences, Magdeburg, Germany
| | - Eckart D Gundelfinger
- Laboratory of Synaptic Signaling, Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany.,Center for Behavioral Brain Sciences, Magdeburg, Germany.,Medical Faculty, Otto von Guericke University, Magdeburg, Germany
| | - Rodrigo Herrera-Molina
- Laboratory of Synaptic Signaling, Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany.,Centro Integrativo de Biología y Química Aplicada, Universidad Bernardo O'Higgins, Santiago, Chile.,Center for Behavioral Brain Sciences, Magdeburg, Germany
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The m6A methyltransferase METTL3 promotes LPS-induced microglia inflammation through TRAF6/NF-κB pathway. Neuroreport 2020; 33:243-251. [PMID: 33165191 DOI: 10.1097/wnr.0000000000001550] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES Microglia are the main effectors in the inflammatory process of the central nervous system. Once overactivated, microglia may release pro-inflammatory cytokines (IL-1β, IL-6, TNF-α and IL-18, etc.) and accelerate neurodegeneration. Here, we aimed to explore the mechanism of how m6A methyltransferase METTL3 affects the inflammatory response of microglia, appropriately inhibiting the overactivation of microglia. MATERIALS AND METHODS Lipopolysaccharide (LPS) was used to construct a cellular inflammation model in vitro. To evaluate the expression of METTL3 and inflammatory cytokines (IL-1β, IL-6, TNF-α and IL-18) in cells, RT-PCR and ELISA were carried out. The related protein (TRAF6, NF-κB and I-κB) expression was examined adopting Western blot. Dot blot experiment was used to assess the effect of regulating METTL3 on the m6A level. Methylated RNA immunoprecipitation reaction was used to measure the effect of METTL3 on the m6A level of TRAF6 mRNA 3'-UTR. The co-immunoprecipitation experiment (IP) proved that METTL3 combines with TRAF6. RESULTS In LPS-mediated microglial inflammation, METTL3 expression was increased, and the expression of inflammatory cytokines (IL-1β, IL-6, TNF-α and IL-18) and inflammatory proteins (TRAF6 and NF-κB) were upregulated. METTL3 level was positively correlated with TRAF6, and the two proteins could bind to each other. Overexpression of METTL3 promoted the activation of the TRAF6-NF-κB pathway in an m6A-dependent manner, and inhibiting NF-κB attenuated METTL3-mediated microglial activation. CONCLUSION METTL3 promotes LPS-induced microglial inflammation by activating the TRAF6-NF-κB pathway.
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Liu X, Liu B, Li R, Wang F, Wang N, Zhang M, Bai Y, Wu J, Liu L, Han D, Li Z, Feng B, Zhou G, Wang S, Zeng L, Miao J, Yao Y, Liang B, Huang L, Wang Q, Wu Y. miR-146a-5p Plays an Oncogenic Role in NSCLC via Suppression of TRAF6. Front Cell Dev Biol 2020; 8:847. [PMID: 33015045 PMCID: PMC7493784 DOI: 10.3389/fcell.2020.00847] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Accepted: 08/07/2020] [Indexed: 12/13/2022] Open
Abstract
Non-small cell lung cancer (NSCLC) is the most deadly cancer in the world due to its often delayed diagnosis. Identification of biomarkers with high sensitivity, specificity, and accessibility for early detection, such as circulating microRNAs, is therefore of utmost importance. In the present study, we identified a significantly higher expression of miR-146a-5p in the serum and tissue samples of NSCLC patients than that of the healthy controls. In parallel, miR-146a-5p was also highly expressed in three human NSCLC adenocarcinoma-cell lines (A549, H1299, and H1975) compared to the human bronchial epithelium cell line (HBE). By dual-luciferase reporter assay and manipulation of the expressions of miR-146a-5p and its target gene, tumor necrosis factor receptor-associated factor 6 (TRAF6), we showed that the functional effects of miR-146a-5p on NSCLC cell survival and migration were mediated by direct binding to and suppression of TRAF6. Overexpression of TRAF6 sufficiently reversed miR-146a-5p-induced cancer cell proliferation, migration, and apoptosis resistance. Our data implied that miR-146a-5p/TRAF6/NF-κB-p65 axis could be a promising diagnostic marker and a therapeutic target for NSCLC.
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Affiliation(s)
- Xiangdong Liu
- Institute for Genome Engineered Animal Models of Human Diseases, Dalian Medical University, Dalian, China.,National Center of Genetically Engineered Animal Models for International Research, Dalian Medical University, Dalian, China.,Liaoning Provence Key Lab of Genome Engineered Animal Models, Dalian Medical University, Dalian, China
| | - Bo Liu
- Institute for Genome Engineered Animal Models of Human Diseases, Dalian Medical University, Dalian, China.,National Center of Genetically Engineered Animal Models for International Research, Dalian Medical University, Dalian, China.,Liaoning Provence Key Lab of Genome Engineered Animal Models, Dalian Medical University, Dalian, China
| | - Ruihua Li
- Department of Clinical Laboratory, Second Affiliated Hospital of Dalian Medical University, Liaoning, China
| | - Fei Wang
- Institute for Genome Engineered Animal Models of Human Diseases, Dalian Medical University, Dalian, China.,National Center of Genetically Engineered Animal Models for International Research, Dalian Medical University, Dalian, China.,Liaoning Provence Key Lab of Genome Engineered Animal Models, Dalian Medical University, Dalian, China
| | - Ning Wang
- Institute for Genome Engineered Animal Models of Human Diseases, Dalian Medical University, Dalian, China.,National Center of Genetically Engineered Animal Models for International Research, Dalian Medical University, Dalian, China.,Liaoning Provence Key Lab of Genome Engineered Animal Models, Dalian Medical University, Dalian, China
| | - Maihe Zhang
- Institute for Genome Engineered Animal Models of Human Diseases, Dalian Medical University, Dalian, China.,National Center of Genetically Engineered Animal Models for International Research, Dalian Medical University, Dalian, China.,Liaoning Provence Key Lab of Genome Engineered Animal Models, Dalian Medical University, Dalian, China
| | - Yang Bai
- Institute for Genome Engineered Animal Models of Human Diseases, Dalian Medical University, Dalian, China.,National Center of Genetically Engineered Animal Models for International Research, Dalian Medical University, Dalian, China.,Division of Hepatobiliary and Pancreatic Surgery, Department of General Surgery, Second Affiliated Hospital of Dalian Medical University, Liaoning, China
| | - Jin Wu
- Institute for Genome Engineered Animal Models of Human Diseases, Dalian Medical University, Dalian, China.,National Center of Genetically Engineered Animal Models for International Research, Dalian Medical University, Dalian, China.,Liaoning Provence Key Lab of Genome Engineered Animal Models, Dalian Medical University, Dalian, China
| | - Liping Liu
- Institute for Genome Engineered Animal Models of Human Diseases, Dalian Medical University, Dalian, China.,National Center of Genetically Engineered Animal Models for International Research, Dalian Medical University, Dalian, China.,Liaoning Provence Key Lab of Genome Engineered Animal Models, Dalian Medical University, Dalian, China
| | - Dongyu Han
- Institute for Genome Engineered Animal Models of Human Diseases, Dalian Medical University, Dalian, China.,National Center of Genetically Engineered Animal Models for International Research, Dalian Medical University, Dalian, China.,Liaoning Provence Key Lab of Genome Engineered Animal Models, Dalian Medical University, Dalian, China
| | - Zhiguang Li
- Center of Genome and Personalized Medicine, Institute of Cancer Stem Cell, Cancer Center, Dalian Medical University, Dalian, China
| | - Bin Feng
- Department of Biotechnology, Dalian Medical University, Dalian, China
| | - Guangbiao Zhou
- Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Shujing Wang
- Liaoning Provence Key Lab of Genome Engineered Animal Models, Dalian Medical University, Dalian, China.,Department of Biochemistry and Molecular Biology, Institute of Glycobiology, Dalian Medical University, Dalian, China
| | - Li Zeng
- Institute for Genome Engineered Animal Models of Human Diseases, Dalian Medical University, Dalian, China.,National Center of Genetically Engineered Animal Models for International Research, Dalian Medical University, Dalian, China.,Liaoning Provence Key Lab of Genome Engineered Animal Models, Dalian Medical University, Dalian, China
| | - Jian Miao
- Division of Hepatobiliary and Pancreatic Surgery, Department of General Surgery, Second Affiliated Hospital of Dalian Medical University, Liaoning, China
| | - Yiqun Yao
- Department of Thyroid and Breast Surgery, Affiliated Zhongshan Hospital of Dalian University, Dalian, China
| | - Bin Liang
- School of Life Sciences, Yunnan University, Kunming, China
| | - Lin Huang
- Liaoning Provence Key Lab of Genome Engineered Animal Models, Dalian Medical University, Dalian, China.,Department of Pathophysiology, College of Basic Medical Sciences, Dalian Medical University, Dalian, China
| | - Qi Wang
- Department of Respiratory Medicine, Second Affiliated Hospital of Dalian Medical University, Liaoning, China
| | - Yingjie Wu
- Institute for Genome Engineered Animal Models of Human Diseases, Dalian Medical University, Dalian, China.,National Center of Genetically Engineered Animal Models for International Research, Dalian Medical University, Dalian, China.,Liaoning Provence Key Lab of Genome Engineered Animal Models, Dalian Medical University, Dalian, China.,Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States.,Division of Endocrinology, Diabetes and Bone Disease, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, United States
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45
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Li B, Yang BB, Shen XL, Wang K, Wei Z, Du ZQ. Molecular characterization and expression analysis of tumor necrosis factor receptor-associated factor 6 (traf6) like gene involved in antibacterial innate immune of fresh water crayfish, Procambarus clarkii. FISH & SHELLFISH IMMUNOLOGY 2020; 104:517-526. [PMID: 32589929 DOI: 10.1016/j.fsi.2020.06.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 06/06/2020] [Accepted: 06/12/2020] [Indexed: 06/11/2023]
Abstract
In invertebrates, innate immunity was the crucial defending pattern against pathogenic microorganisms. For the past few years, Toll or Toll like receptors (TLRs) signaling pathway was studied extensively in crustaceans. Among the components of Toll or Toll like receptors (TLRs) signaling pathway, tumor necrosis factor receptor-associated factor 6 (TRAF6) acted as an important cytoplasmic adaptor, which was conserved from Drosophila to human. In this study, a new traf6 like gene was cloned from hepatopancreas of P. clarkii. After challenged respectively by S. aureus or E. ictaluri, the expression profiles were studied. And the results showed that the mRNA transcript of Pc-traf6 like gene was up-regulated significantly in the hemocytes, hepatopancreas, gills, and intestine of crayfish. After Pc-traf6 like gene was knocked down, the expression levels of transcription factor (Dorsal) and some crucial immunity effectors (ALF 3, Lysozyme 1, Lectin 1, and Crustin 2) in TLRs signaling pathway were dramatically suppressed. Simultaneously, the survival rate of crayfish challenged respectively by S. aureus or E. ictaluri was significantly decreased in RNAi assay. All these results indicated that Pc-traf6 like gene played an important role in regulating the expression of downstream effectors in the TLRs signaling pathway of crayfish.
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Affiliation(s)
- Bo Li
- School of Life Science and Technology, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia autonomous region, 014010, China
| | - Bing-Bing Yang
- School of Life Science and Technology, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia autonomous region, 014010, China
| | - Xiu-Li Shen
- Library, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia autonomous region, 014010, China
| | - Kai Wang
- School of Life Science and Technology, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia autonomous region, 014010, China
| | - Zhe Wei
- School of Life Science and Technology, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia autonomous region, 014010, China
| | - Zhi-Qiang Du
- School of Life Science and Technology, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia autonomous region, 014010, China.
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46
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Yao YY, Ling EA, Lu D. Microglia mediated neuroinflammation - signaling regulation and therapeutic considerations with special reference to some natural compounds. Histol Histopathol 2020; 35:1229-1250. [PMID: 32662061 DOI: 10.14670/hh-18-239] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Neuroinflammation plays a central role in multiple neurodegenerative diseases and neurological disorders such as Alzheimer's disease (AD), Parkinson's disease (PD), cerebral ischemic injury etc. In this connection, microglia, the key players in the central nervous system, mediate the inflammatory response process. In brain injuries, activated microglia can clear the cellular debris and invading pathogens and release neurotrophic factors; however, prolonged microglia activation may cause neuronal death through excessive release of inflammatory mediators. Therefore, it is of paramount importance to understand the underlying molecular mechanisms of microglia activation to design an effective therapeutic strategy to alleviate neuronal injury. Recent studies have shown that some natural compounds and herbal extracts possess anti-inflammatory properties that may suppress microglial activation and ameliorate neuroinflammation and hence are neuroprotective. In this review, we will update some of the common signaling pathways that regulate microglia activation. Among the various signaling pathways, the Notch-1, mitogen-activated protein kinases (MAPKs), and nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) have been reported to exacerbate microglia mediated neuroinflammation that is implicated in different neuropathological diseases. The search for natural compounds or agents, specifically those derived from natural herbal extracts such as Gastrodin, scutellarin, RG1 etc. has been the focus of many of our recent studies because they have been found to regulate microglia activation. The pharmacological effects of these agents and their potential mechanisms for regulating microglia activation are systematically reviewed here for a fuller understanding of their biochemical action and therapeutic potential for treatment of microglia mediated neuropathological diseases.
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Affiliation(s)
- Yue-Yi Yao
- Technology Transfer Center, Kunming Medical University, Kunming, China
| | - Eng-Ang Ling
- Department of Anatomy, Young Loo Lin School of Medicine, National University of Singapore, Singapore.
| | - Di Lu
- Technology Transfer Center, Kunming Medical University, Kunming, China.
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Yang Y, Tan X, Xu J, Wang T, Liang T, Xu X, Ma C, Xu Z, Wang W, Li H, Shen H, Li X, Dong W, Chen G. Luteolin alleviates neuroinflammation via downregulating the TLR4/TRAF6/NF-κB pathway after intracerebral hemorrhage. Biomed Pharmacother 2020; 126:110044. [PMID: 32114357 DOI: 10.1016/j.biopha.2020.110044] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 02/19/2020] [Accepted: 02/23/2020] [Indexed: 12/14/2022] Open
Abstract
The activation of microglia and inflammatory responses is essential for the process of intracerebral hemorrhage (ICH)-induced secondary brain injury (SBI). In this study, we investigated the effects of luteolin on ICH-induced SBI and the potential mechanisms. Autologous blood was injected to establish the ICH model in vivo, and oxyhemoglobin (OxyHb) was used to mimic the ICH model in vitro. We found that the administration of luteolin significantly improved motor and sensory impairments and inhibited neuronal cell degeneration in vivo. In the in vitro study, the decrease of the neuronal cell viability induced by activated microglia was alleviated by luteolin treatment. Furthermore, by antagonizing the activation of the Toll-like receptor 4 (TLR4)/TNF receptor-associated factor 6 (TRAF6)/nuclear transcription factor-κB (NF-κB) signaling pathway, the ICH-induced elevation of cytokine release was decreased after treatment with luteolin, which was confirmed both in vivo and in vitro. Additionally, we found that luteolin engaged with TRAF6 and inhibited the ubiquitination of TRAF6. Taken together, our findings demonstrate the neuroprotective effects of luteolin after ICH and the potential mechanisms, which suggest that luteolin is a potential therapeutic candidate for ICH treatment.
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Affiliation(s)
- Yi Yang
- Department of Neurology, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, Jiangsu Province, China
| | - Xin Tan
- Department of Neurology, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, Jiangsu Province, China
| | - Jianguo Xu
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Tianyi Wang
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Tianyu Liang
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Xiang Xu
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Cheng Ma
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Zhongmou Xu
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Wenjie Wang
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Haiying Li
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Haitao Shen
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Xiang Li
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China.
| | - Wanli Dong
- Department of Neurology, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, Jiangsu Province, China.
| | - Gang Chen
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
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Lu Y, Xu HM, Han Y, Zhang YL. Analgesic effect of resveratrol on colitis-induced visceral pain via inhibition of TRAF6/NF-κB signaling pathway in the spinal cord. Brain Res 2019; 1724:146464. [DOI: 10.1016/j.brainres.2019.146464] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 08/08/2019] [Accepted: 09/15/2019] [Indexed: 12/15/2022]
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49
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RNF34 overexpression exacerbates neurological deficits and brain injury in a mouse model of intracerebral hemorrhage by potentiating mitochondrial dysfunction-mediated oxidative stress. Sci Rep 2019; 9:16296. [PMID: 31704983 PMCID: PMC6841714 DOI: 10.1038/s41598-019-52494-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Accepted: 10/07/2019] [Indexed: 12/27/2022] Open
Abstract
Intracerebral hemorrhage (ICH) is a common neurological condition associated with high disability and mortality. Alterations in protein ubiquitination have emerged as a key mechanism in the pathogenesis of neurological diseases. Here, we investigated the effects of the E3 ubiquitin ligase ring finger protein 34 (RNF34) on neurological deficits and brain injury in ICH mice. An ICH model was established via intracerebral injection of autologous blood into wild-type and RNF34 transgenic mice. Brain injury, neurological function, neuronal activity, and oxidative stress levels were measured, respectively. The underlying mechanisms were explored by molecular and cellular approaches. Our results showed that RNF34 overexpression in mice significantly aggravated the ICH-induced memory impairment, brain edema, infarction, hematoma volume, and loss of neuronal activity. RNF34 and oxidative stress levels gradually increased from 6 to 48 h after the ICH challenge and were positively correlated. The ICH-induced increase in intracellular ROS, superoxide anion, and mROS generation and the decrease in adenosine triphosphate production were exacerbated in RNF34 transgenic mice, but NADPH oxidase activity was unaffected. Moreover, RNF34 upregulation potentiated the ICH-induced decrease in PGC-1α, UCP2, and MnSOD expressions. RNF34 interacted with PGC-1α and targeted it for ubiquitin-dependent degradation. This study reveals that RNF34 exacerbates neurological deficits and brain injury by facilitating PGC-1α protein degradation and promoting mitochondrial dysfunction-mediated oxidative stress.
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50
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Chen Z, Cho E, Lee J, Lee S, Lee TH. Inhibitory Effects of N-[2-(4-acetyl-1-piperazinyl) phenyl]-2-(2-chlorophenoxy) acetamide on Osteoclast Differentiation In Vitro via the Downregulation of TRAF6. Int J Mol Sci 2019; 20:ijms20205196. [PMID: 31635168 PMCID: PMC6829416 DOI: 10.3390/ijms20205196] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 10/18/2019] [Accepted: 10/18/2019] [Indexed: 12/11/2022] Open
Abstract
Osteoclasts are poly-nuclear cells that resorb mineral components from old or damaged bone tissue. Primary mononuclear cells are activated by receptor activator of nuclear factor kappa-Β ligand (RANKL) and differentiate into large multinucleated cells. Dysregulation of osteoclast differentiation can lead to pathological bone loss and destruction. Many studies have focused on the development of new molecules to regulate RANKL-mediated signaling. In this study, N-[2-(4-acetyl-1-piperazinyl)phenyl]-2-(2-chlorophenoxy) acetamide (PPOA-N-Ac-2-Cl) led to a significant decrease in the formation of multinucleated tartrate-resistant acid phosphatase (TRAP)-positive cells in a dose-dependent manner, without inducing significant cytotoxicity. PPOA-N-Ac-2-Cl affected the expression of osteoclast-specific marker genes, such as TRAF6, c-fos, DC-STAMP, NFATc1, MMP9, CtsK, and TRAP (Acp5), during RANKL-mediated osteoclastogenesis. Moreover, PPOA-N-Ac-2-Cl significantly attenuated the protein levels of CtsK, a critical protease involved in bone resorption. Accordingly, bone resorption activity and F-actin ring formation decreased in the presence of PPOA-N-Ac-2-Cl. In conclusion, this study shows that PPOA-N-Ac-2-Cl acts as an inhibitor of osteoclast differentiation and may serve as a potential candidate agent for the treatment of osteoclast-related bone diseases by virtue of attenuating bone resorption.
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Affiliation(s)
- Zhihao Chen
- Department of Molecular Medicine (BK21plus), Chonnam National University Graduate School, Gwangju 61186, Korea.
| | - Eunjin Cho
- Department of Oral Biochemistry, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju 61186, Korea.
| | - Jinkyung Lee
- Department of Oral Biochemistry, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju 61186, Korea.
| | - Sunwoo Lee
- Department of Chemistry, Chonnam National University, Gwangju 61186, Korea.
| | - Tae-Hoon Lee
- Department of Molecular Medicine (BK21plus), Chonnam National University Graduate School, Gwangju 61186, Korea.
- Department of Oral Biochemistry, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju 61186, Korea.
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