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Hertens P, van Loo G. A20: a jack of all trades. Trends Cell Biol 2024; 34:360-362. [PMID: 38461099 DOI: 10.1016/j.tcb.2024.02.008] [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: 12/20/2023] [Revised: 02/13/2024] [Accepted: 02/15/2024] [Indexed: 03/11/2024]
Abstract
Mutations and polymorphisms in A20/TNFAIP3 have been linked to various inflammatory disorders. However, in addition to its well-known role in inflammation, A20 also controls EDAR- and receptor activator of NF-κB (RANK)-induced NF-κB signaling, regulating the development of epidermal skin appendages and bone, respectively. Furthermore, A20 regulates synapse remodeling through a mechanism dependent on NF-κB.
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Affiliation(s)
- Pieter Hertens
- VIB Center for Inflammation Research, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Geert van Loo
- VIB Center for Inflammation Research, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium.
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2
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Ma Q, Ruan H, Dai H, Yao WD. USP48/USP31 Is a Nuclear Deubiquitinase that Potently Regulates Synapse Remodeling. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.19.558317. [PMID: 37781625 PMCID: PMC10541093 DOI: 10.1101/2023.09.19.558317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
Deubiquitinases present locally at synapses regulate synaptic development, function, and plasticity. It remains largely unknown, however, whether deubiquitinases localized outside of the synapse control synapse remodeling. Here we identify ubiquitin specific protease 48 (USP48; formerly USP31) as a nuclear deubiquitinase mediating robust synapse removal. USP48 is expressed primarily during the first postnatal week in the rodent brain and is virtually restricted to nuclei, mediated by a conserved, 13-amino acid nuclear localization signal. When exogenously expressed, USP48, in a deubiquitinase and nuclear localization-dependent manner, induces striking filopodia elaboration, marked spine loss, and significantly reduced synaptic protein clustering in vitro, and erases ~70% of functional synapses in vivo. USP48 interacts with the transcription factor NF-κB, deubiquitinates NF-κB subunit p65 and promotes its stability and activation, and up-regulates NF-κB target genes known to inhibit synaptogenesis. Depleting NF-κB prevents USP48-dependent spine pruning. These findings identify a novel nucleus-enriched deubiquitinase that plays critical roles in synapse remodeling.
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Affiliation(s)
- Qi Ma
- Departments of Psychiatry and Neuroscience, State University of New York, Upstate Medical University, Syracuse, NY 13210
| | - Hongyu Ruan
- Departments of Psychiatry and Neuroscience, State University of New York, Upstate Medical University, Syracuse, NY 13210
| | - Huihui Dai
- Departments of Psychiatry and Neuroscience, State University of New York, Upstate Medical University, Syracuse, NY 13210
| | - Wei-Dong Yao
- Departments of Psychiatry and Neuroscience, State University of New York, Upstate Medical University, Syracuse, NY 13210
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Zajicek AS, Ruan H, Dai H, Skolfield MC, Phillips HL, Burnette WJ, Javidfar B, Sun SC, Akbarian S, Yao WD. Cylindromatosis drives synapse pruning and weakening by promoting macroautophagy through Akt-mTOR signaling. Mol Psychiatry 2022; 27:2414-2424. [PMID: 35449295 PMCID: PMC9278694 DOI: 10.1038/s41380-022-01571-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 04/04/2022] [Accepted: 04/07/2022] [Indexed: 11/09/2022]
Abstract
The lysine-63 deubiquitinase cylindromatosis (CYLD) is long recognized as a tumor suppressor in immunity and inflammation, and its loss-of-function mutations lead to familial cylindromatosis. However, recent studies reveal that CYLD is enriched in mammalian brain postsynaptic densities, and a gain-of-function mutation causes frontotemporal dementia (FTD), suggesting critical roles at excitatory synapses. Here we report that CYLD drives synapse elimination and weakening by acting on the Akt-mTOR-autophagy axis. Mice lacking CYLD display abnormal sociability, anxiety- and depression-like behaviors, and cognitive inflexibility. These behavioral impairments are accompanied by excessive synapse numbers, increased postsynaptic efficacy, augmented synaptic summation, and impaired NMDA receptor-dependent hippocampal long-term depression (LTD). Exogenous expression of CYLD results in removal of established dendritic spines from mature neurons in a deubiquitinase activity-dependent manner. In search of underlying molecular mechanisms, we find that CYLD knockout mice display marked overactivation of Akt and mTOR and reduced autophagic flux, and conversely, CYLD overexpression potently suppresses Akt and mTOR activity and promotes autophagy. Consequently, abrogating the Akt-mTOR-autophagy signaling pathway abolishes CYLD-induced spine loss, whereas enhancing autophagy in vivo by the mTOR inhibitor rapamycin rescues the synaptic pruning and LTD deficits in mutant mice. Our findings establish CYLD, via Akt-mTOR signaling, as a synaptic autophagy activator that exerts critical modulations on synapse maintenance, function, and plasticity.
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Affiliation(s)
- Alexis S Zajicek
- Department of Psychiatry and Behavioral Sciences, State University of New York, Upstate Medical University, Syracuse, NY, 13210, USA
- Neuroscience Graduate Program, State University of New York, Upstate Medical University, Syracuse, NY, 13210, USA
| | - Hongyu Ruan
- Department of Psychiatry and Behavioral Sciences, State University of New York, Upstate Medical University, Syracuse, NY, 13210, USA
| | - Huihui Dai
- Department of Psychiatry and Behavioral Sciences, State University of New York, Upstate Medical University, Syracuse, NY, 13210, USA
| | - Mary C Skolfield
- Department of Psychiatry and Behavioral Sciences, State University of New York, Upstate Medical University, Syracuse, NY, 13210, USA
- Neuroscience Graduate Program, State University of New York, Upstate Medical University, Syracuse, NY, 13210, USA
| | - Hannah L Phillips
- Department of Psychiatry and Behavioral Sciences, State University of New York, Upstate Medical University, Syracuse, NY, 13210, USA
- Neuroscience Graduate Program, State University of New York, Upstate Medical University, Syracuse, NY, 13210, USA
| | - Wendi J Burnette
- Department of Psychiatry and Behavioral Sciences, State University of New York, Upstate Medical University, Syracuse, NY, 13210, USA
- Neuroscience Graduate Program, State University of New York, Upstate Medical University, Syracuse, NY, 13210, USA
| | - Behnam Javidfar
- Friedman Brain Institute, Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - Shao-Cong Sun
- Department of Immunology, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Schahram Akbarian
- Friedman Brain Institute, Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - Wei-Dong Yao
- Department of Psychiatry and Behavioral Sciences, State University of New York, Upstate Medical University, Syracuse, NY, 13210, USA.
- Neuroscience Graduate Program, State University of New York, Upstate Medical University, Syracuse, NY, 13210, USA.
- Department of Neuroscience and Physiology, State University of New York, Upstate Medical University, Syracuse, NY, 13210, USA.
- Harvard Medical School, New England Primate Research Center, Southborough, MA, USA.
- Department of Psychiatry, Beth Israel Deaconess Medical Center, Boston, MA, USA.
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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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Triviño JJ, von Bernhardi R. The effect of aged microglia on synaptic impairment and its relevance in neurodegenerative diseases. Neurochem Int 2021; 144:104982. [PMID: 33556444 DOI: 10.1016/j.neuint.2021.104982] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 01/31/2021] [Accepted: 02/01/2021] [Indexed: 02/07/2023]
Abstract
Microglia serve key functions in the central nervous system (CNS), participating in the establishment and regulation of synapses and the neuronal network, and regulating activity-dependent plastic changes. As the neuroimmune system, they respond to endogenous and exogenous signals to protect the CNS. In aging, one of the main changes is the establishment of inflamm-aging, a mild chronic inflammation that reduces microglial response to stressors. Neuroinflammation depends mainly on the increased activation of microglia. Microglia over-activation may result in a reduced capacity for performing normal functions related to migration, clearance, and the adoption of an anti-inflammatory state, contributing to an increased susceptibility for neurodegeneration. Oxidative stress contributes both to aging and to the progression of neurodegenerative diseases. Increased production of reactive oxygen species (ROS) and neuroinflammation associated with age- and disease-dependent mechanisms affect synaptic activity and neurotransmission, leading to cognitive dysfunction. Astrocytes prevent microglial cell cytotoxicity by mechanisms mediated by transforming growth factor β1 (TGFβ1). However, TGFβ1-Smad3 pathway is impaired in aging, and the age-related impairment of TGFβ signaling can reduce protective activation while facilitating cytotoxic activation of microglia. A critical analysis on the effect of aging microglia on neuronal function is relevant for the understanding of age-related changes on neuronal function. Here, we present evidence in the context of the "microglial dysregulation hypothesis", which leads to the reduction of the protective functions and increased cytotoxicity of microglia, to discuss the mechanisms involved in neurodegenerative changes and Alzheimer's disease.
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Affiliation(s)
- Juan José Triviño
- Department of Neurology, Pontificia Universidad Católica de Chile School of Medicine, Laboratory of Neuroscience. Marcoleta 391, Santiago, Chile
| | - Rommy von Bernhardi
- Department of Neurology, Pontificia Universidad Católica de Chile School of Medicine, Laboratory of Neuroscience. Marcoleta 391, Santiago, Chile; Faculty of Health Sciences, Universidad San Sebastián, Lota 2465, Santiago, Chile.
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Lin CC, Huang TL. SIGIRR and TNFAIP3 Are Differentially Expressed in Both PBMC and TNF-α Secreting Cells of Patients With Major Depressive Disorder. Front Psychiatry 2021; 12:698257. [PMID: 34393859 PMCID: PMC8356912 DOI: 10.3389/fpsyt.2021.698257] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 06/30/2021] [Indexed: 12/15/2022] Open
Abstract
Background: Major depressive disorder (MDD) is associated with the activation of the immune/inflammatory system. TNF-α is associated with MDD and poor treatment response. Toll-like receptors (TLR) are responsible in innate immune response, and is associated with MDD and antidepressant response. Some negative regulators of TLR pathway such as SOCS1, TOLLIP, SIGIRR, TNFAIP3, and MyD88s, are reported to be differentially expressed in the peripheral blood samples of patients of MDD. Methods: We recruited patients with MDD and healthy controls, collect their demographic data, and measured their mRNA levels of negative TLR regulators, using peripheral blood mononuclear cells (PBMC) and isolated TNF-α secreting cells. Clinical symptoms were evaluated using Halmiton Depression Rating Scale (Ham-D). Some patients were evaluated again after 4 weeks of antidepressant treatment. Results: Forty-seven patients with MDD and 52 healthy controls were recruited. Between the PBMC samples of 37 MDD patients and 42 controls, mRNA levels of SOCS1, SIGIRR, TNFAIP3, and MyD88s were significantly different. Between TNF-α secreting cells of 10 MDD patients and 10 controls, mRNA levels of SIGIRR and TNFAIP3 were significantly different. Change of Ham-D score only correlated significantly with TOLLIP mRNA level after treatment. Conclusion: SIGIRR and TNFAIP3, two negative regulators of TLR immune response pathways, were differentially expressed in both PBMC and TNF-α secreting cells of patients with MDD as compared to healthy controls. The negative regulations of innate immune response could contribute to the underlying mechanism of MDD.
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Affiliation(s)
- Chin-Chuen Lin
- Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Tiao-Lai Huang
- Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan.,Genomic and Proteomic Core Laboratory, Department of Medical Research, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan
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Remodeling without destruction: non-proteolytic ubiquitin chains in neural function and brain disorders. Mol Psychiatry 2021; 26:247-264. [PMID: 32709994 PMCID: PMC9229342 DOI: 10.1038/s41380-020-0849-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 07/08/2020] [Accepted: 07/14/2020] [Indexed: 12/31/2022]
Abstract
Ubiquitination is a fundamental posttranslational protein modification that regulates diverse biological processes, including those in the CNS. Several topologically and functionally distinct polyubiquitin chains can be assembled on protein substrates, modifying their fates. The classical and most prevalent polyubiquitin chains are those that tag a substrate to the proteasome for degradation, which has been established as a major mechanism driving neural circuit deconstruction and remodeling. In contrast, proteasome-independent non-proteolytic polyubiquitin chains regulate protein scaffolding, signaling complex formation, and kinase activation, and play essential roles in an array of signal transduction processes. Despite being a cornerstone in immune signaling and abundant in the mammalian brain, these non-proteolytic chains are underappreciated in neurons and synapses in the brain. Emerging studies have begun to generate exciting insights about some fundamental roles played by these non-degradative chains in neuronal function and plasticity. In addition, their roles in a number of brain diseases are being recognized. In this article, we discuss recent advances on these nonconventional ubiquitin chains in neural development, function, plasticity, and related pathologies.
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Razani B, Malynn BA, Ma A. Preserving immune homeostasis with A20. Adv Immunol 2020; 148:1-48. [PMID: 33190732 DOI: 10.1016/bs.ai.2020.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
A20/TNFAIP3 is a TNF induced gene that plays a profound role in preserving cellular and organismal homeostasis (Lee, et al., 2000; Opipari etal., 1990). This protein has been linked to multiple human diseases via genetic, epigenetic, and an emerging series of patients with mono-allelic coding mutations. Diverse cellular functions of this pleiotropically expressed protein include immune-suppressive, anti-inflammatory, and cell protective functions. The A20 protein regulates ubiquitin dependent cell signals; however, the biochemical mechanisms by which it performs these functions is surprisingly complex. Deciphering these cellular and biochemical facets of A20 dependent biology should greatly improve our understanding of murine and human disease pathophysiology as well as unveil new mechanisms of cell and tissue biology.
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Affiliation(s)
- Bahram Razani
- Department of Dermatology, University of California, San Francisco, CA, United States
| | - Barbara A Malynn
- Department of Medicine, University of California, San Francisco, San Francisco, CA, United States
| | - Averil Ma
- Department of Medicine, University of California, San Francisco, San Francisco, CA, United States.
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