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Zhao L, Gong H, Huang H, Tuerhong G, Xia H. Participation of Mind Bomb-2 in Sevoflurane Anesthesia Induces Cognitive Impairment in Aged Mice via Modulating Ferroptosis. ACS Chem Neurosci 2021; 12:2399-2408. [PMID: 34121396 DOI: 10.1021/acschemneuro.1c00131] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Postoperative cognitive dysfunction (POCD) is a complication of the central nervous system (CNS) often occurred after surgery or anesthesia in the elder patients. Mind bomb-2 (MIB2) has been reported to modulate neuronal functions. Here, we aimed to study whether MIB2 exerts roles in the effects of sevoflurane anesthesia on mice hippocampal neurons and function, and how. Aging male C57BL/6 mice were subjected to sevoflurane administration, and primary hippocampal neurons were adopted to study sevoflurane effects in vitro. Western blotting and immunohistochemistry assay were used to study the protein expression of MIB2. CCK-8 assay and propidium iodide (PI) staining were performed to evaluate cell viability and cell death, respectively. Ferroptosis-related indicators malondialdehyde (MDA), glutathione (GSH), and iron levels were checked through indicated ELISA kits. Co-immunoprecipitation was adopted to study the binding effects of MIB2 to GPX4. We found that sevoflurane anesthesia increased MIB2 expression in mice hippocampus tissues and neurons. Knockdown of MIB2 alleviated neuron death and ferroptosis induced by sevoflurane exposure. Downregulated MIB2 enhanced GPX4 stability and reduced its ubiquitination. MIB2 was verified to bind to GPX4. The effects of MIB2 knockdown on the neuron death and ferroptosis can be reversed by further siGPX4 transfection. In vivo results also showed that MIB2 knockdown reduced hippocampal neuron death, ferroptosis, and cognitive impairments in the sevoflurane-exposed mice. Taking all together, downregulation of MIB2 could alleviate the sevoflurane-anesthesia-induced cognitive dysfunction and neuron injury through reducing ferroptosis via GPX4. Our results also provide novel directions for POCD treatment using anti-MIB2-related drugs or strategies.
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Affiliation(s)
- Lili Zhao
- Department of Anesthesiology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi Province 330006, China
| | - Haixia Gong
- Department of Anesthesiology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi Province 330006, China
| | - Haijin Huang
- Department of Anesthesiology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi Province 330006, China
| | - Gulisitan Tuerhong
- Department of Anesthesiology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi Province 330006, China
| | - Haimei Xia
- Department of Anesthesiology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi Province 330006, China
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Historical perspective and progress on protein ubiquitination at glutamatergic synapses. Neuropharmacology 2021; 196:108690. [PMID: 34197891 DOI: 10.1016/j.neuropharm.2021.108690] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 06/07/2021] [Accepted: 06/22/2021] [Indexed: 12/23/2022]
Abstract
Transcription-translation coupling leads to the production of proteins that are key for controlling essential neuronal processes that include neuronal development and changes in synaptic strength. Although these events have been a prevailing theme in neuroscience, the regulation of proteins via posttranslational signaling pathways are equally relevant for these neuronal processes. Ubiquitin is one type of posttranslational modification that covalently attaches to its targets/substrates. Ubiquitination of proteins play a key role in multiple signaling pathways, the predominant being removal of its substrates by a large molecular machine called the proteasome. Here, I review 40 years of progress on ubiquitination in the nervous system at glutamatergic synapses focusing on axon pathfinding, synapse formation, presynaptic release, dendritic spine formation, and regulation of postsynaptic glutamate receptors. Finally, I elucidate emerging themes in ubiquitin biology that may challenge our current understanding of ubiquitin signaling in the nervous system.
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MIND bomb 2 prevents RIPK1 kinase activity-dependent and -independent apoptosis through ubiquitylation of cFLIP L. Commun Biol 2021; 4:80. [PMID: 33469115 PMCID: PMC7815719 DOI: 10.1038/s42003-020-01603-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 12/16/2020] [Indexed: 12/20/2022] Open
Abstract
Mind bomb 2 (MIB2) is an E3 ligase involved in Notch signalling and attenuates TNF-induced apoptosis through ubiquitylation of receptor-interacting protein kinase 1 (RIPK1) and cylindromatosis. Here we show that MIB2 bound and conjugated K48– and K63–linked polyubiquitin chains to a long-form of cellular FLICE-inhibitory protein (cFLIPL), a catalytically inactive homologue of caspase 8. Deletion of MIB2 did not impair the TNF-induced complex I formation that mediates NF-κB activation but significantly enhanced formation of cytosolic death-inducing signalling complex II. TNF-induced RIPK1 Ser166 phosphorylation, a hallmark of RIPK1 death-inducing activity, was enhanced in MIB2 knockout cells, as was RIPK1 kinase activity-dependent and -independent apoptosis. Moreover, RIPK1 kinase activity-independent apoptosis was induced in cells expressing cFLIPL mutants lacking MIB2-dependent ubiquitylation. Together, these results suggest that MIB2 suppresses both RIPK1 kinase activity-dependent and -independent apoptosis, through suppression of RIPK1 kinase activity and ubiquitylation of cFLIPL, respectively. Nakabayashi et al find that the E3 ligase MIB2 ubiquitylates the apoptosis-inhibitor cFLIP and that deletion of MIB2 enhances both RIPK1 kinase-dependent and -independent apoptosis through an increase in RIPK1 kinase activity and impairment of ubiquitylation of cFLIPL, respectively.
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Salazar JL, Yang SA, Yamamoto S. Post-Developmental Roles of Notch Signaling in the Nervous System. Biomolecules 2020; 10:biom10070985. [PMID: 32630239 PMCID: PMC7408554 DOI: 10.3390/biom10070985] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 06/25/2020] [Accepted: 06/26/2020] [Indexed: 12/14/2022] Open
Abstract
Since its discovery in Drosophila, the Notch signaling pathway has been studied in numerous developmental contexts in diverse multicellular organisms. The role of Notch signaling in nervous system development has been extensively investigated by numerous scientists, partially because many of the core Notch signaling components were initially identified through their dramatic ‘neurogenic’ phenotype of developing fruit fly embryos. Components of the Notch signaling pathway continue to be expressed in mature neurons and glia cells, which is suggestive of a role in the post-developmental nervous system. The Notch pathway has been, so far, implicated in learning and memory, social behavior, addiction, and other complex behaviors using genetic model organisms including Drosophila and mice. Additionally, Notch signaling has been shown to play a modulatory role in several neurodegenerative disease model animals and in mediating neural toxicity of several environmental factors. In this paper, we summarize the knowledge pertaining to the post-developmental roles of Notch signaling in the nervous system with a focus on discoveries made using the fruit fly as a model system as well as relevant studies in C elegans, mouse, rat, and cellular models. Since components of this pathway have been implicated in the pathogenesis of numerous psychiatric and neurodegenerative disorders in human, understanding the role of Notch signaling in the mature brain using model organisms will likely provide novel insights into the mechanisms underlying these diseases.
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Affiliation(s)
- Jose L. Salazar
- Department of Molecular and Human Genetics, Baylor College of Medicine (BCM), Houston, TX 77030, USA; (J.L.S.); (S.-A.Y.)
| | - Sheng-An Yang
- Department of Molecular and Human Genetics, Baylor College of Medicine (BCM), Houston, TX 77030, USA; (J.L.S.); (S.-A.Y.)
| | - Shinya Yamamoto
- Department of Molecular and Human Genetics, Baylor College of Medicine (BCM), Houston, TX 77030, USA; (J.L.S.); (S.-A.Y.)
- Department of Neuroscience, BCM, Houston, TX 77030, USA
- Program in Developmental Biology, BCM, Houston, TX 77030, USA
- Development, Disease Models & Therapeutics Graduate Program, BCM, Houston, TX 77030, USA
- Jan and Dan Duncan Neurological Research Institute, Texas Children’s Hospital, Houston, TX 77030, USA
- Correspondence: ; Tel.: +1-832-824-8119
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Li X, Liao Y, Dong Y, Li S, Wang F, Wu R, Yuan Z, Cheng J. Mib2 Deficiency Inhibits Microglial Activation and Alleviates Ischemia-Induced Brain Injury. Aging Dis 2020; 11:523-535. [PMID: 32489699 PMCID: PMC7220279 DOI: 10.14336/ad.2019.0807] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Accepted: 08/07/2019] [Indexed: 12/20/2022] Open
Abstract
Neuroinflammation plays a critical role in ischemia-induced brain injury. Mib2, an E3 ubiquitin ligase, has been reported to regulate Notch signaling and participate in the peripheral immune system. However, the roles of Mib2 in the nervous system are not well characterized. In this study, we show that Mib2 is involved in lipopolysaccharide (LPS)- and oxygen-glucose deprivation (OGD)-induced microglial activation. Mechanistically, Mib2 interacts with the IKK complex and regulates the activation of NF-κB signaling, thus modulating Notch1 transcription in the microglia. Furthermore, we generated a microglia-specific Mib2 knockout mice and found that microglia-specific deletion of Mib2 significantly alleviates ischemia-induced neuroinflammation and brain injury. Taken together, our results reveal a critical role of Mib2 in microglial activation and ischemia-induced brain injury, thus providing a potential target for the treatment of stroke.
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Affiliation(s)
- Xiaoheng Li
- 1Beijing Institute for Brain Disorders, Capital Medical University, Beijing, China
| | - Yajin Liao
- 2The Brain Science Center, Beijing Institute of Basic Medical Sciences, Beijing, China.,3Center on Translational Neuroscience, College of Life & Environmental Science, Minzu University of China, Beijing, China
| | - Yuan Dong
- 4Department of Biochemistry, Medical College, Qingdao University, Qingdao, Shandong, China
| | - Shuoshuo Li
- 5The State Key Laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Fengchao Wang
- 6National Institute of Biological Sciences, Beijing, China
| | - Rong Wu
- 2The Brain Science Center, Beijing Institute of Basic Medical Sciences, Beijing, China
| | - Zengqiang Yuan
- 1Beijing Institute for Brain Disorders, Capital Medical University, Beijing, China.,2The Brain Science Center, Beijing Institute of Basic Medical Sciences, Beijing, China
| | - Jinbo Cheng
- 2The Brain Science Center, Beijing Institute of Basic Medical Sciences, Beijing, China.,3Center on Translational Neuroscience, College of Life & Environmental Science, Minzu University of China, Beijing, China
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Kim MJ, Lee RU, Oh J, Choi JE, Kim H, Lee K, Hwang SK, Lee JH, Lee JA, Kaang BK, Lim CS, Lee YS. Spatial Learning and Motor Deficits in Vacuolar Protein Sorting-associated Protein 13b ( Vps13b) Mutant Mouse. Exp Neurobiol 2019; 28:485-494. [PMID: 31495077 PMCID: PMC6751864 DOI: 10.5607/en.2019.28.4.485] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Revised: 07/29/2019] [Accepted: 07/30/2019] [Indexed: 02/04/2023] Open
Abstract
Vacuolar protein sorting-associated protein 13B (VPS13B), also known as COH1, is one of the VPS13 family members which is involved in transmembrane transport, Golgi integrity, and neuritogenesis. Mutations in the VPS13B gene are associated with Cohen syndrome and other cognitive disorders such as intellectual disabilities and autism spectrum disorder (ASD). However, the patho-physiology of VPS13B-associated cognitive deficits is unclear, in part, due to the lack of animal models. Here, we generated a Vps13b exon 2 deletion mutant mouse and analyzed the behavioral phenotypes. We found that Vps13b mutant mice showed reduced activity in open field test and significantly shorter latency to fall in the rotarod test, suggesting that the mutants have motor deficits. In addition, we found that Vps13b mutant mice showed deficits in spatial learning in the hidden platform version of the Morris water maze. The Vps13b mutant mice were normal in other behaviors such as anxiety-like behaviors, working memory and social behaviors. Our results suggest that Vps13b mutant mice may recapitulate key clinical symptoms in Cohen syndrome such as intellectual disability and hypotonia. Vps13b mutant mice may serve as a useful model to investigate the pathophysiology of VPS13B-associated disorders.
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Affiliation(s)
- Min Jung Kim
- Department of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul 08826, Korea
| | - Ro Un Lee
- Department of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul 08826, Korea
| | - Jihae Oh
- Department of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul 08826, Korea
| | - Ja Eun Choi
- Department of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul 08826, Korea
| | - Hyopil Kim
- Department of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul 08826, Korea
| | - Kyungmin Lee
- Behavioral Neural Circuitry and Physiology Laboratory, Department of Anatomy, Brain Science & Engineering Institute, Kyungpook National University Graduate School of Medicine, Daegu 41944, Korea
| | - Su-Kyeong Hwang
- Department of Pediatrics, Kyungpook National University Hospital, Daegu 41944, Korea
| | - Jae-Hyung Lee
- Department of Life and Nanopharmaceutical Sciences, Department of Maxillofacial Biomedical Engineering, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Jin-A Lee
- Department of Biotechnology and Biological Sciences, Hannam University, Daejeon 34430, Korea
| | - Bong-Kiun Kaang
- Department of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul 08826, Korea
| | - Chae-Seok Lim
- Department of Pharmacology, Wonkwang University School of Medicine, Iksan 54538, Korea
| | - Yong-Seok Lee
- Department of Physiology, Biomedical Sciences, Neuroscience Research Institute, Seoul National University College of Medicine, Seoul 03080, Korea
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Zemoura K, Trümpler C, Benke D. Lys-63-linked Ubiquitination of γ-Aminobutyric Acid (GABA), Type B1, at Multiple Sites by the E3 Ligase Mind Bomb-2 Targets GABAB Receptors to Lysosomal Degradation. J Biol Chem 2016; 291:21682-21693. [PMID: 27573246 PMCID: PMC5076837 DOI: 10.1074/jbc.m116.750968] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Revised: 08/24/2016] [Indexed: 11/06/2022] Open
Abstract
GABAB receptors are heterodimeric G protein-coupled receptors, which control neuronal excitability by mediating prolonged inhibition. The magnitude of GABAB receptor-mediated inhibition essentially depends on the amount of receptors in the plasma membrane. However, the factors regulating cell surface expression of GABAB receptors are poorly characterized. Cell surface GABAB receptors are constitutively internalized and either recycled to the plasma membrane or degraded in lysosomes. The signal that sorts GABAB receptors to lysosomes is currently unknown. Here we show that Mind bomb-2 (MIB2)-mediated Lys-63-linked ubiquitination of the GABAB1 subunit at multiple sites is the lysosomal sorting signal for GABAB receptors. We found that inhibition of lysosomal activity in cultured rat cortical neurons increased the fraction of Lys-63-linked ubiquitinated GABAB receptors and enhanced the expression of total as well as cell surface GABAB receptors. Mutational inactivation of four putative ubiquitination sites in the GABAB1 subunit significantly diminished Lys-63-linked ubiquitination of GABAB receptors and prevented their lysosomal degradation. We identified MIB2 as the E3 ligase triggering Lys-63-linked ubiquitination and lysosomal degradation of GABAB receptors. Finally, we show that sustained activation of glutamate receptors, a condition occurring in brain ischemia that down-regulates GABAB receptors, considerably increased the expression of MIB2 and Lys-63-linked ubiquitination of GABAB receptors. Interfering with Lys-63-linked ubiquitination by overexpressing ubiquitin mutants or GABAB1 mutants deficient in Lys-63-linked ubiquitination prevented glutamate-induced down-regulation of the receptors. These findings indicate that Lys-63-linked ubiquitination of GABAB1 at multiple sites by MIB2 controls sorting of GABAB receptors to lysosomes for degradation under physiological and pathological conditions.
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Affiliation(s)
- Khaled Zemoura
- From the Institute of Pharmacology and Toxicology, University of Zurich
| | - Claudia Trümpler
- From the Institute of Pharmacology and Toxicology, University of Zurich
| | - Dietmar Benke
- From the Institute of Pharmacology and Toxicology, University of Zurich,
- the Neuroscience Center Zurich, University of Zurich and ETH Zurich, and
- the Drug Discovery Network Zurich (DDNZ), Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
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