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Liang ZK, Xiong W, Wang C, Chen L, Zou X, Mai JW, Dong B, Guo C, Xin WJ, Luo DX, Xu T, Feng X. Resolving neuroinflammatory and social deficits in ASD model mice: Dexmedetomidine downregulates NF-κB/IL-6 pathway via α2AR. Brain Behav Immun 2024; 119:84-95. [PMID: 38552922 DOI: 10.1016/j.bbi.2024.03.040] [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: 12/07/2023] [Revised: 03/12/2024] [Accepted: 03/26/2024] [Indexed: 04/05/2024] Open
Abstract
Autism spectrum disorder (ASD) is a neurodevelopmental disorder that severely affects individuals' daily life and social development. Unfortunately, there are currently no effective treatments for ASD. Dexmedetomidine (DEX) is a selective agonist of α2 adrenergic receptor (α2AR) and is widely used as a first-line medication for sedation and hypnosis in clinical practice. In recent years, there have been reports suggesting its potential positive effects on improving emotional and cognitive functions. However, whether dexmedetomidine has therapeutic effects on the core symptoms of ASD, namely social deficits and repetitive behaviors, remains to be investigated. In the present study, we employed various behavioral tests to assess the phenotypes of animals, including the three-chamber, self-grooming, marble burying, open field, and elevated plus maze. Additionally, electrophysiological recordings, western blotting, qPCR were mainly used to investigate and validate the potential mechanisms underlying the role of dexmedetomidine. We found that intraperitoneal injection of dexmedetomidine in ASD model mice-BTBR T+ Itpr3tf/J (BTBR) mice could adaptively improve their social deficits. Further, we observed a significant reduction in c-Fos positive signals and interleukin-6 (IL-6) expression level in the prelimbic cortex (PrL) of the BTBR mice treated with dexmedetomidine. Enhancing or inhibiting the action of IL-6 directly affects the social behavior of BTBR mice. Mechanistically, we have found that NF-κB p65 is a key pathway regulating IL-6 expression in the PrL region. In addition, we have confirmed that the α2AR acts as a receptor switch mediating the beneficial effects of dexmedetomidine in improving social deficits. This study provides the first evidence of the beneficial effects of dexmedetomidine on core symptoms of ASD and offers a theoretical basis and potential therapeutic approach for the clinical treatment of ASD.
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Affiliation(s)
- Zheng-Kai Liang
- Department of Anesthesiology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, PR China
| | - Wei Xiong
- Department of Anesthesiology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, PR China
| | - Chen Wang
- Department of Anesthesiology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, PR China
| | - Li Chen
- Neuroscience Program, Guangdong Province Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou 510080, PR China
| | - Xin Zou
- Neuroscience Program, Guangdong Province Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou 510080, PR China
| | - Jing-Wen Mai
- Department of Anesthesiology, Huizhou Central People's Hospital, Huizhou 516000, PR China
| | - Bo Dong
- Neuroscience Program, Guangdong Province Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou 510080, PR China
| | - Chongqi Guo
- Neuroscience Program, Guangdong Province Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou 510080, PR China
| | - Wen-Jun Xin
- Neuroscience Program, Guangdong Province Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou 510080, PR China
| | - De-Xing Luo
- Department of Anesthesiology, Huizhou Central People's Hospital, Huizhou 516000, PR China.
| | - Ting Xu
- Neuroscience Program, Guangdong Province Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou 510080, PR China.
| | - Xia Feng
- Department of Anesthesiology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, PR China.
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Lennartz M, Benjamin Dünnebier N, Höflmayer D, Dwertmann Rico S, Kind S, Reiswich V, Viehweger F, Lutz F, Fraune C, Gorbokon N, Luebke AM, Hube-Magg C, Büscheck F, Menz A, Uhlig R, Krech T, Hinsch A, Burandt E, Sauter G, Simon R, Kluth M, Steurer S, Marx AH, Lebok P, Dum D, Minner S, Jacobsen F, Clauditz TS, Bernreuther C. GAD2 Is a Highly Specific Marker for Neuroendocrine Neoplasms of the Pancreas. Am J Surg Pathol 2024; 48:377-386. [PMID: 38271200 PMCID: PMC10930383 DOI: 10.1097/pas.0000000000002186] [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] [Indexed: 01/27/2024]
Abstract
Glutamate decarboxylase 2 (GAD2) is the most important inhibitory neurotransmitter and plays a role in insulin-producing β cells of pancreatic islets. The limitation of GAD2 expression to a few normal cell types makes GAD2 a potential immunohistochemical diagnostic marker. To evaluate the diagnostic utility of GAD2 immunohistochemistry, a tissue microarray containing 19,202 samples from 152 different tumor entities and 608 samples of 76 different normal tissue types was analyzed. In normal tissues, GAD2 staining was restricted to brain and pancreatic islet cells. GAD2 staining was seen in 20 (13.2%) of 152 tumor categories, including 5 (3.3%) tumor categories containing at least 1 strongly positive case. GAD2 immunostaining was most commonly seen in neuroendocrine carcinomas (58.3%) and neuroendocrine tumors (63.2%) of the pancreas, followed by granular cell tumors (37.0%) and neuroendocrine tumors of the lung (11.1%). GAD2 was only occasionally (<10% of cases) seen in 16 other tumor entities including paraganglioma, medullary thyroid carcinoma, and small cell neuroendocrine carcinoma of the urinary bladder. Data on GAD2 and progesterone receptor (PR) expression (from a previous study) were available for 95 pancreatic and 380 extrapancreatic neuroendocrine neoplasms. For determining a pancreatic origin of a neuroendocrine neoplasm, the sensitivity of GAD2 was 64.2% and specificity 96.3%, while the sensitivity of PR was 56.8% and specificity 92.6%. The combination of PR and GAD2 increased both sensitivity and specificity. GAD2 immunohistochemistry is a highly useful diagnostic tool for the identification of pancreatic origin in case of neuroendocrine neoplasms with unknown site of origin.
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Affiliation(s)
- Maximilian Lennartz
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | | | - Doris Höflmayer
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | | | - Simon Kind
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Viktor Reiswich
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Florian Viehweger
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Florian Lutz
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Christoph Fraune
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Natalia Gorbokon
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Andreas M. Luebke
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Claudia Hube-Magg
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Franziska Büscheck
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Anne Menz
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Ria Uhlig
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Till Krech
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
- Institute of Pathology, Clinical Center Osnabrueck, Osnabrueck
| | - Andrea Hinsch
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Eike Burandt
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Guido Sauter
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Ronald Simon
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Martina Kluth
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Stefan Steurer
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Andreas H. Marx
- Department of Pathology, Academic Hospital Fuerth, Fuerth Germany
| | - Patrick Lebok
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
- Institute of Pathology, Clinical Center Osnabrueck, Osnabrueck
| | - David Dum
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Sarah Minner
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Frank Jacobsen
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Till S. Clauditz
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg
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Cagnetta R, Flanagan JG, Sonenberg N. Control of Selective mRNA Translation in Neuronal Subcellular Compartments in Health and Disease. J Neurosci 2023; 43:7247-7263. [PMID: 37914402 PMCID: PMC10621772 DOI: 10.1523/jneurosci.2240-22.2023] [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: 12/06/2022] [Revised: 04/28/2023] [Accepted: 05/02/2023] [Indexed: 11/03/2023] Open
Abstract
In multiple cell types, mRNAs are transported to subcellular compartments, where local translation enables rapid, spatially localized, and specific responses to external stimuli. Mounting evidence has uncovered important roles played by local translation in vivo in axon survival, axon regeneration, and neural wiring, as well as strong links between dysregulation of local translation and neurologic disorders. Omic studies have revealed that >1000 mRNAs are present and can be selectively locally translated in the presynaptic and postsynaptic compartments from development to adulthood in vivo A large proportion of the locally translated mRNAs is specifically upregulated or downregulated in response to distinct extracellular signals. Given that the local translatome is large, selectively translated, and cue-specifically remodeled, a fundamental question concerns how selective translation is achieved locally. Here, we review the emerging regulatory mechanisms of local selective translation in neuronal subcellular compartments, their mRNA targets, and their orchestration. We discuss mechanisms of local selective translation that remain unexplored. Finally, we describe clinical implications and potential therapeutic strategies in light of the latest advances in gene therapy.
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Affiliation(s)
- Roberta Cagnetta
- Department of Biochemistry and Goodman Cancer Institute, McGill University, Montreal, Quebec H3A 1A3, Canada
| | - John G Flanagan
- Department of Cell Biology and Program in Neuroscience, Harvard Medical School, Boston, Massachusetts 02115
| | - Nahum Sonenberg
- Department of Biochemistry and Goodman Cancer Institute, McGill University, Montreal, Quebec H3A 1A3, Canada
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Chiou KL, Huang X, Bohlen MO, Tremblay S, DeCasien AR, O’Day DR, Spurrell CH, Gogate AA, Zintel TM, Andrews MG, Martínez MI, Starita LM, Montague MJ, Platt ML, Shendure J, Snyder-Mackler N. A single-cell multi-omic atlas spanning the adult rhesus macaque brain. SCIENCE ADVANCES 2023; 9:eadh1914. [PMID: 37824616 PMCID: PMC10569716 DOI: 10.1126/sciadv.adh1914] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 09/12/2023] [Indexed: 10/14/2023]
Abstract
Cataloging the diverse cellular architecture of the primate brain is crucial for understanding cognition, behavior, and disease in humans. Here, we generated a brain-wide single-cell multimodal molecular atlas of the rhesus macaque brain. Together, we profiled 2.58 M transcriptomes and 1.59 M epigenomes from single nuclei sampled from 30 regions across the adult brain. Cell composition differed extensively across the brain, revealing cellular signatures of region-specific functions. We also identified 1.19 M candidate regulatory elements, many previously unidentified, allowing us to explore the landscape of cis-regulatory grammar and neurological disease risk in a cell type-specific manner. Altogether, this multi-omic atlas provides an open resource for investigating the evolution of the human brain and identifying novel targets for disease interventions.
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Affiliation(s)
- Kenneth L. Chiou
- Center for Evolution and Medicine, Arizona State University, Tempe, AZ, USA
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
| | - Xingfan Huang
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
- Paul G. Allen School of Computer Science and Engineering, University of Washington, Seattle, WA, USA
| | - Martin O. Bohlen
- Department of Biomedical Engineering, Duke University, Durham, NC, USA
| | - Sébastien Tremblay
- Department of Neuroscience, University of Pennsylvania, Philadelphia, PA, USA
| | - Alex R. DeCasien
- Section on Developmental Neurogenomics, National Institute of Mental Health, Bethesda, MD, USA
| | - Diana R. O’Day
- Brotman Baty Institute for Precision Medicine, Seattle, WA, USA
| | - Cailyn H. Spurrell
- Brotman Baty Institute for Precision Medicine, Seattle, WA, USA
- Seattle Children's Research Institute, Seattle, WA, USA
| | - Aishwarya A. Gogate
- Brotman Baty Institute for Precision Medicine, Seattle, WA, USA
- Seattle Children's Research Institute, Seattle, WA, USA
| | - Trisha M. Zintel
- Center for Evolution and Medicine, Arizona State University, Tempe, AZ, USA
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
| | - Cayo Biobank Research Unit
- Center for Evolution and Medicine, Arizona State University, Tempe, AZ, USA
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
- Paul G. Allen School of Computer Science and Engineering, University of Washington, Seattle, WA, USA
- Department of Biomedical Engineering, Duke University, Durham, NC, USA
- Department of Neuroscience, University of Pennsylvania, Philadelphia, PA, USA
- Section on Developmental Neurogenomics, National Institute of Mental Health, Bethesda, MD, USA
- Brotman Baty Institute for Precision Medicine, Seattle, WA, USA
- Seattle Children's Research Institute, Seattle, WA, USA
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, USA
- Caribbean Primate Research Center, University of Puerto Rico, San Juan, PR, USA
- Department of Psychology, University of Pennsylvania, Philadelphia, PA, USA
- Marketing Department, University of Pennsylvania, Philadelphia, PA, USA
- Howard Hughes Medical Institute, Seattle, WA, USA
- Allen Discovery Center for Cell Lineage Tracing, Seattle, WA, USA
- School of Human Evolution and Social Change, Arizona State University, Tempe, AZ, USA
- ASU-Banner Neurodegenerative Disease Research Center, Arizona State University, Tempe, AZ, USA
| | - Madeline G. Andrews
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, USA
| | - Melween I. Martínez
- Caribbean Primate Research Center, University of Puerto Rico, San Juan, PR, USA
| | - Lea M. Starita
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
- Brotman Baty Institute for Precision Medicine, Seattle, WA, USA
| | - Michael J. Montague
- Department of Neuroscience, University of Pennsylvania, Philadelphia, PA, USA
| | - Michael L. Platt
- Department of Neuroscience, University of Pennsylvania, Philadelphia, PA, USA
- Department of Psychology, University of Pennsylvania, Philadelphia, PA, USA
- Marketing Department, University of Pennsylvania, Philadelphia, PA, USA
| | - Jay Shendure
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
- Brotman Baty Institute for Precision Medicine, Seattle, WA, USA
- Howard Hughes Medical Institute, Seattle, WA, USA
- Allen Discovery Center for Cell Lineage Tracing, Seattle, WA, USA
| | - Noah Snyder-Mackler
- Center for Evolution and Medicine, Arizona State University, Tempe, AZ, USA
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
- School of Human Evolution and Social Change, Arizona State University, Tempe, AZ, USA
- ASU-Banner Neurodegenerative Disease Research Center, Arizona State University, Tempe, AZ, USA
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Zha C, Gamache K, Hardt OM, Sossin WS. Behavioral characterization of Capn15 conditional knockout mice. Behav Brain Res 2023; 454:114635. [PMID: 37598906 DOI: 10.1016/j.bbr.2023.114635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 08/16/2023] [Accepted: 08/17/2023] [Indexed: 08/22/2023]
Abstract
Calpain 15 (CAPN15) is an intracellular cysteine protease belonging to the non-classical small optic lobe (SOL) family of calpains, which has an important role in development. Loss of Capn15 in mice leads to developmental eye anomalies and volumetric changes in the brain. Human individuals with biallelic variants in CAPN15 have developmental delay, neurodevelopmental disorders, as well as congenital malformations. In Aplysia, a reductionist model to study learning and memory, SOL calpain is important for non-associative long-term facilitation, the cellular analog of sensitization behavior. However, how CAPN15 is involved in adult behavior or learning and memory in vertebrates is unknown. Here, using Capn15 conditional knockout mice, we show that loss of the CAPN15 protein in excitatory forebrain neurons reduces self-grooming and marble burying, decreases performance in the accelerated roto-rod and reduces pre-tone freezing after strong fear conditioning. Thus, CAPN15 plays a role in regulating behavior in the adult mouse.
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Affiliation(s)
- Congyao Zha
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec H3A 2B4, Canada
| | - Karine Gamache
- Department of Psychology, McGill University, Montreal, Quebec H3A 1B1, Canada
| | - Oliver M Hardt
- Department of Psychology, McGill University, Montreal, Quebec H3A 1B1, Canada
| | - Wayne S Sossin
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec H3A 2B4, Canada.
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6
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Longo F, Aryal S, Anastasiades PG, Maltese M, Baimel C, Albanese F, Tabor J, Zhu JD, Oliveira MM, Gastaldo D, Bagni C, Santini E, Tritsch NX, Carter AG, Klann E. Cell-type-specific disruption of cortico-striatal circuitry drives repetitive patterns of behavior in fragile X syndrome model mice. Cell Rep 2023; 42:112901. [PMID: 37505982 PMCID: PMC10552611 DOI: 10.1016/j.celrep.2023.112901] [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: 12/05/2022] [Revised: 05/18/2023] [Accepted: 07/13/2023] [Indexed: 07/30/2023] Open
Abstract
Individuals with fragile X syndrome (FXS) are frequently diagnosed with autism spectrum disorder (ASD), including increased risk for restricted and repetitive behaviors (RRBs). Consistent with observations in humans, FXS model mice display distinct RRBs and hyperactivity that are consistent with dysfunctional cortico-striatal circuits, an area relatively unexplored in FXS. Using a multidisciplinary approach, we dissect the contribution of two populations of striatal medium spiny neurons (SPNs) in the expression of RRBs in FXS model mice. Here, we report that dysregulated protein synthesis at cortico-striatal synapses is a molecular culprit of the synaptic and ASD-associated motor phenotypes displayed by FXS model mice. Cell-type-specific translational profiling of the FXS mouse striatum reveals differentially translated mRNAs, providing critical information concerning potential therapeutic targets. Our findings uncover a cell-type-specific impact of the loss of fragile X messenger ribonucleoprotein (FMRP) on translation and the sequence of neuronal events in the striatum that drive RRBs in FXS.
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Affiliation(s)
- Francesco Longo
- Center for Neural Science, New York University, New York, NY 10003, USA; Institute for Neuroscience and Physiology, University of Gothenburg, 40530 Gothenburg, Sweden; Sackler Institute of Graduate Biomedical Sciences, NYU School of Medicine, New York, NY 10016, USA
| | - Sameer Aryal
- Center for Neural Science, New York University, New York, NY 10003, USA; NYU Neuroscience Institute, New York University Grossman School of Medicine, New York, NY 10016, USA
| | | | - Marta Maltese
- Fresco Institute for Parkinson's and Movement Disorders, New York University Langone Health, New York, NY 10016, USA; Department of Fundamental Neurosciences, University of Lausanne, 1005 Lausanne, Switzerland
| | - Corey Baimel
- Center for Neural Science, New York University, New York, NY 10003, USA
| | - Federica Albanese
- Center for Neural Science, New York University, New York, NY 10003, USA
| | - Joanna Tabor
- Center for Neural Science, New York University, New York, NY 10003, USA
| | - Jeffrey D Zhu
- Center for Neural Science, New York University, New York, NY 10003, USA
| | | | - Denise Gastaldo
- Department of Biomedicine and Prevention, University of Rome "Tor Vergata," 1005 Rome, Italy
| | - Claudia Bagni
- Department of Biomedicine and Prevention, University of Rome "Tor Vergata," 1005 Rome, Italy
| | - Emanuela Santini
- Center for Neural Science, New York University, New York, NY 10003, USA; Department of Neuroscience, Biomedicum, Karolinska Institute, 171 77 Stockholm, Sweden
| | - Nicolas X Tritsch
- NYU Neuroscience Institute, New York University Grossman School of Medicine, New York, NY 10016, USA; Fresco Institute for Parkinson's and Movement Disorders, New York University Langone Health, New York, NY 10016, USA
| | - Adam G Carter
- Center for Neural Science, New York University, New York, NY 10003, USA
| | - Eric Klann
- Center for Neural Science, New York University, New York, NY 10003, USA; NYU Neuroscience Institute, New York University Grossman School of Medicine, New York, NY 10016, USA.
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Lourenco MV. Preface: Special issue "Brain Proteostasis in Health and Disease". J Neurochem 2023; 166:3-6. [PMID: 37414435 DOI: 10.1111/jnc.15879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 05/18/2023] [Indexed: 07/08/2023]
Abstract
This preface introduces the Journal of Neurochemistry Special Issue on Brain Proteostasis. Adequate control of protein homeostasis, or proteostasis, has been at the center stage of brain physiology, and its deregulation may contribute to brain diseases, including several neuropsychiatric and neurodegenerative conditions. Therefore, delineating the processes underlying protein synthesis, folding, stability, function, and degradation in brain cells is key to promoting brain function and identifying effective therapeutic options for neurological disorders. This special issue comprises four review articles and four original articles covering the roles of protein homeostasis in several mechanisms that are of relevance to sleep, depression, stroke, dementia, and COVID-19. Thus, these articles highlight different aspects of proteostasis regulation in the brain and present important evidence on this growing and exciting field.
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Affiliation(s)
- Mychael V Lourenco
- Institute of Medical Biochemistry Leopoldo de Meis, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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Tan X, Wang J, Yao J, Yuan J, Dai Y, Sun M, Zhang T, Yang J, Cai W, Qiu L, Sun J. Microglia participate in postoperative cognitive dysfunction by mediating the loss of inhibitory synapse through the complement pathway. Neurosci Lett 2023; 796:137049. [PMID: 36608926 DOI: 10.1016/j.neulet.2023.137049] [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: 09/22/2022] [Revised: 12/13/2022] [Accepted: 01/01/2023] [Indexed: 01/05/2023]
Abstract
BACKGROUND Elderly patients after surgery are prone to cognitive decline known as postoperative cognitive dysfunction (POCD). Several studies have shown that the microglial activation and the increase of complement protein expression in hippocampus induced by surgery may be related to the pathogenesis of POCD. The purpose of this study was to determine whether microglia and complement system were involved in cognitive dysfunction in aged mice. METHODS The POCD model was established by exploratory laparotomy in 15-month-old male C57BL/6J mice and animal behavioral tests were performed to test hippocampal-dependent memory capacity. Minocycline was used to suppress the activation of microglia, and complement 3 receptor inhibitor was used to suppress the association between microglia and complement 3. Western blot and immunofluorescence were used to detect the microglial activation, complement protein, and synaptic protein expressions. RESULTS Operation induced hippocampal-dependent memory impairment (P < 0.01), which was accompanied by microglial activation (P < 0.01). There was also a significant reduction in inhibitory synaptic protein expression in the hippocampus of mice in the surgery group (P < 0.01). However, minocycline, a microglia inhibitor, rescued all the above changes. In addition, C3RI intervention inhibited the phagocytosis of inhibitory synapses by microglia (P < 0.05) and improved the cognitive function of mice (P < 0.01). CONCLUSION Microglia participate in postoperative cognitive dysfunction by mediating inhibitory synaptic loss through the complement pathway.
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Affiliation(s)
- Xiaoxiang Tan
- Department of Anesthesiology, Surgery and Pain Management, Zhongda Hospital, the School of Medicine, Southeast University, Nanjing, Jiangsu Province, China
| | - Jiajia Wang
- Department of Anesthesiology, Surgery and Pain Management, Zhongda Hospital, the School of Medicine, Southeast University, Nanjing, Jiangsu Province, China
| | - Juan Yao
- Department of Anesthesiology, Surgery and Pain Management, Zhongda Hospital, the School of Medicine, Southeast University, Nanjing, Jiangsu Province, China
| | - Jing Yuan
- Department of Anesthesiology, Surgery and Pain Management, Zhongda Hospital, the School of Medicine, Southeast University, Nanjing, Jiangsu Province, China
| | - Yuchen Dai
- Department of Anesthesiology, Surgery and Pain Management, Zhongda Hospital, the School of Medicine, Southeast University, Nanjing, Jiangsu Province, China
| | - Menghan Sun
- Department of Anesthesiology, Surgery and Pain Management, Zhongda Hospital, the School of Medicine, Southeast University, Nanjing, Jiangsu Province, China
| | - Tianhao Zhang
- Department of Anesthesiology, Surgery and Pain Management, Zhongda Hospital, the School of Medicine, Southeast University, Nanjing, Jiangsu Province, China
| | - Jiaojiao Yang
- Department of Anesthesiology, Surgery and Pain Management, Zhongda Hospital, the School of Medicine, Southeast University, Nanjing, Jiangsu Province, China
| | - Wenlan Cai
- Department of Anesthesiology, Surgery and Pain Management, Zhongda Hospital, the School of Medicine, Southeast University, Nanjing, Jiangsu Province, China
| | - Lili Qiu
- Department of Anesthesiology, Surgery and Pain Management, Zhongda Hospital, the School of Medicine, Southeast University, Nanjing, Jiangsu Province, China.
| | - Jie Sun
- Department of Anesthesiology, Surgery and Pain Management, Zhongda Hospital, the School of Medicine, Southeast University, Nanjing, Jiangsu Province, China.
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9
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Li Z, Chen K, Shao Q, Lu H, Zhang X, Pu Y, Sun X, He H, Cao L. Nanoparticulate MgH 2 ameliorates anxiety/depression-like behaviors in a mouse model of multiple sclerosis by regulating microglial polarization and oxidative stress. J Neuroinflammation 2023; 20:16. [PMID: 36710351 PMCID: PMC9885636 DOI: 10.1186/s12974-023-02696-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 01/11/2023] [Indexed: 01/31/2023] Open
Abstract
Multiple sclerosis (MS) is an autoimmune demyelinating disease of the central nervous system (CNS). Anxiety and depression are the most common psychiatric comorbidities of MS, which seriously affect patients' quality of life, treatment compliance, and prognosis. However, current treatments for anxiety and depression in MS show low therapeutic efficacy and significant side effects. In the present study, we explored the therapeutic effects of a novel low-toxic anti-inflammatory drug, nanoparticulate magnesium hydride (MgH2), on mood disorders of MS. We observed that anxiety/depression-like behaviors in experimental autoimmune encephalomyelitis (EAE) mice were alleviated by MgH2 treatment. In addition, disease severity and inflammatory demyelination were also diminished. Furthermore, we confirmed the suppressive effect of MgH2 on depression in the acute restraint stress model. Mechanistically, MgH2 may play a therapeutic role by promoting microglial M2 polarization, inhibiting microglial M1 polarization, and reducing oxidative stress and mitochondrial damage. Therefore, nanoparticulate MgH2 may be a promising therapeutic drug for psychiatric comorbidities of MS.
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Affiliation(s)
- Zhenghao Li
- grid.73113.370000 0004 0369 1660Institute of Neuroscience and Key Laboratory of Molecular Neurobiology of Military of Education, Naval Medical University, Shanghai, 200433 China
| | - Kefu Chen
- grid.73113.370000 0004 0369 1660Institute of Neuroscience and Key Laboratory of Molecular Neurobiology of Military of Education, Naval Medical University, Shanghai, 200433 China
| | - Qi Shao
- grid.73113.370000 0004 0369 1660Institute of Neuroscience and Key Laboratory of Molecular Neurobiology of Military of Education, Naval Medical University, Shanghai, 200433 China
| | - Hongtao Lu
- grid.73113.370000 0004 0369 1660Department of Naval Medicine, Naval Medical University, Shanghai, 200433 China
| | - Xin Zhang
- grid.73113.370000 0004 0369 1660Institute of Neuroscience and Key Laboratory of Molecular Neurobiology of Military of Education, Naval Medical University, Shanghai, 200433 China
| | - Yingyan Pu
- grid.73113.370000 0004 0369 1660Institute of Neuroscience and Key Laboratory of Molecular Neurobiology of Military of Education, Naval Medical University, Shanghai, 200433 China
| | - Xuejun Sun
- grid.73113.370000 0004 0369 1660Department of Naval Medicine, Naval Medical University, Shanghai, 200433 China ,grid.16821.3c0000 0004 0368 8293Center of Hydrogen Science, Shanghai Jiao Tong University, Shanghai, 200030 China
| | - Hua He
- grid.73113.370000 0004 0369 1660Department of Neurosurgery, Third Affiliated Hospital, Naval Medical University, Shanghai, 200438 China
| | - Li Cao
- grid.73113.370000 0004 0369 1660Institute of Neuroscience and Key Laboratory of Molecular Neurobiology of Military of Education, Naval Medical University, Shanghai, 200433 China
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10
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Wiebe S, Huang Z, Ladak RJ, Skalecka A, Cagnetta R, Lacaille JC, Aguilar-Valles A, Sonenberg N. Cell-type-specific translational control of spatial working memory by the cap-binding protein 4EHP. Mol Brain 2023; 16:9. [PMID: 36650535 PMCID: PMC9847188 DOI: 10.1186/s13041-023-00995-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 01/01/2023] [Indexed: 01/19/2023] Open
Abstract
The consolidation of learned information into long-lasting memories requires the strengthening of synaptic connections through de novo protein synthesis. Translation initiation factors play a cardinal role in gating the production of new proteins thereby regulating memory formation. Both positive and negative regulators of translation play a critical role in learning and memory consolidation. The eukaryotic initiation factor 4E (eIF4E) homologous protein (4EHP, encoded by the gene Eif4e2) is a pivotal negative regulator of translation but its role in learning and memory is unknown. To address this gap in knowledge, we generated excitatory (glutamatergic: CaMKIIα-positive) and inhibitory (GABAergic: GAD65-positive) conditional knockout mice for 4EHP, which were analyzed in various behavioral memory tasks. Knockout of 4EHP in Camk2a-expressing neurons (4EHP-cKOexc) did not impact long-term memory in either contextual fear conditioning or Morris water maze tasks. Similarly, long-term contextual fear memory was not altered in Gad2-directed 4EHP knockout mice (4EHP-cKOinh). However, when subjected to a short-term T-maze working memory task, both mouse models exhibited impaired cognition. We therefore tested the hypothesis that de novo protein synthesis plays a direct role in working memory. We discovered that phosphorylation of ribosomal protein S6, a measure of mTORC1 activity, is dramatically reduced in the CA1 hippocampus of 4EHP-cKOexc mice. Consistently, genetic reduction of mTORC1 activity in either excitatory or inhibitory neurons was sufficient to impair working memory. Taken together, these findings indicate that translational control by 4EHP and mTORC1 in both excitatory and inhibitory neurons are necessary for working memory.
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Affiliation(s)
- Shane Wiebe
- grid.14709.3b0000 0004 1936 8649Department of Biochemistry, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Montreal, QC H3G 1Y6 Canada ,Goodman Cancer Institute, 1160 Pine Avenue West, Room 614, Montreal, QC H3A 1A3 Canada
| | - Ziying Huang
- grid.14709.3b0000 0004 1936 8649Department of Biochemistry, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Montreal, QC H3G 1Y6 Canada ,Goodman Cancer Institute, 1160 Pine Avenue West, Room 614, Montreal, QC H3A 1A3 Canada
| | - Reese Jalal Ladak
- grid.14709.3b0000 0004 1936 8649Department of Biochemistry, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Montreal, QC H3G 1Y6 Canada ,Goodman Cancer Institute, 1160 Pine Avenue West, Room 614, Montreal, QC H3A 1A3 Canada
| | - Agnieszka Skalecka
- grid.14709.3b0000 0004 1936 8649Department of Biochemistry, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Montreal, QC H3G 1Y6 Canada ,Goodman Cancer Institute, 1160 Pine Avenue West, Room 614, Montreal, QC H3A 1A3 Canada
| | - Roberta Cagnetta
- grid.14709.3b0000 0004 1936 8649Department of Biochemistry, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Montreal, QC H3G 1Y6 Canada ,Goodman Cancer Institute, 1160 Pine Avenue West, Room 614, Montreal, QC H3A 1A3 Canada
| | - Jean-Claude Lacaille
- grid.14848.310000 0001 2292 3357Department of Neuroscience and CIRCA, University of Montreal, Succ. Downtown, P. O. Box 6128, Montreal, QC H3C 3J7 Canada
| | - Argel Aguilar-Valles
- grid.34428.390000 0004 1936 893XDepartment of Neuroscience, Carleton University, Health Sciences Building, 1125 Colonel By Drive, Ottawa, ON K1S 5B6 Canada
| | - Nahum Sonenberg
- grid.14709.3b0000 0004 1936 8649Department of Biochemistry, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Montreal, QC H3G 1Y6 Canada ,Goodman Cancer Institute, 1160 Pine Avenue West, Room 614, Montreal, QC H3A 1A3 Canada
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11
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Newsome SD, Johnson T. Stiff person syndrome spectrum disorders; more than meets the eye. J Neuroimmunol 2022; 369:577915. [PMID: 35717735 PMCID: PMC9274902 DOI: 10.1016/j.jneuroim.2022.577915] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Revised: 05/21/2022] [Accepted: 06/07/2022] [Indexed: 10/18/2022]
Abstract
Stiff person syndrome spectrum disorders (SPSD) are a group of rare neuroimmunological disorders that often include painful spasms and rigidity. However, patients have highly heterogeneous signs and symptoms which may reflect different mechanistic disease processes. Understanding subsets of patients based on clinical phenotype may be important for prognosis and guiding treatment. The goal of this review is to provide updates on SPSD and its expanding clinical spectrum, prognostic markers, and treatment considerations. Further, we describe the current understanding in immunopathogenesis and highlight gaps in our knowledge appropriate for future research directions. Examples of revised diagnostic criteria for SPSD based on phenotype are also presented.
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Affiliation(s)
- Scott D Newsome
- Johns Hopkins University School of Medicine, Baltimore, MD, USA.
| | - Tory Johnson
- Johns Hopkins University School of Medicine, Baltimore, MD, USA; Section of Infections of the Nervous System, NINDS, NIH, Bethesda, MD, USA
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12
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Blagburn-Blanco SV, Chappell MS, De Biase LM, DeNardo LA. Synapse-specific roles for microglia in development: New horizons in the prefrontal cortex. Front Mol Neurosci 2022; 15:965756. [PMID: 36003220 PMCID: PMC9394540 DOI: 10.3389/fnmol.2022.965756] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 07/13/2022] [Indexed: 11/19/2022] Open
Abstract
Dysfunction of both microglia and circuitry in the medial prefrontal cortex (mPFC) have been implicated in numerous neuropsychiatric disorders, but how microglia affect mPFC development in health and disease is not well understood. mPFC circuits undergo a prolonged maturation after birth that is driven by molecular programs and activity-dependent processes. Though this extended development is crucial to acquire mature cognitive abilities, it likely renders mPFC circuitry more susceptible to disruption by genetic and environmental insults that increase the risk of developing mental health disorders. Recent work suggests that microglia directly influence mPFC circuit maturation, though the biological factors underlying this observation remain unclear. In this review, we discuss these recent findings along with new studies on the cellular mechanisms by which microglia shape sensory circuits during postnatal development. We focus on the molecular pathways through which glial cells and immune signals regulate synaptogenesis and activity-dependent synaptic refinement. We further highlight how disruptions in these pathways are implicated in the pathogenesis of neurodevelopmental and psychiatric disorders associated with mPFC dysfunction, including schizophrenia and autism spectrum disorder (ASD). Using these disorders as a framework, we discuss microglial mechanisms that could link environmental risk factors including infections and stress with ongoing genetic programs to aberrantly shape mPFC circuitry.
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Affiliation(s)
- Sara V. Blagburn-Blanco
- Neuroscience Interdepartmental Program, University of California, Los Angeles, Los Angeles, CA, United States
- Medical Scientist Training Program, University of California, Los Angeles, Los Angeles, CA, United States
- Department of Physiology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Megan S. Chappell
- Neuroscience Interdepartmental Program, University of California, Los Angeles, Los Angeles, CA, United States
- Department of Physiology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Lindsay M. De Biase
- Department of Physiology, University of California, Los Angeles, Los Angeles, CA, United States
- *Correspondence: Lindsay M. De Biase,
| | - Laura A. DeNardo
- Department of Physiology, University of California, Los Angeles, Los Angeles, CA, United States
- Laura A. DeNardo,
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13
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Bove M, Schiavone S, Tucci P, Sikora V, Dimonte S, Colia AL, Morgese MG, Trabace L. Ketamine administration in early postnatal life as a tool for mimicking Autism Spectrum Disorders core symptoms. Prog Neuropsychopharmacol Biol Psychiatry 2022; 117:110560. [PMID: 35460811 DOI: 10.1016/j.pnpbp.2022.110560] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 04/11/2022] [Accepted: 04/14/2022] [Indexed: 12/23/2022]
Abstract
Autism Spectrum Disorders (ASD) core symptoms include deficits of social interaction, stereotyped behaviours, dysfunction in language and communication. Beyond them, several additional symptoms, such as cognitive impairment, anxiety-like states and hyperactivity are often occurring, mainly overlapping with other neuropsychiatric diseases. To untangle mechanisms underlying ASD etiology, and to identify possible pharmacological approaches, different factors, such as environmental, immunological and genetic ones, need to be considered. In this context, ASD animal models, aiming to reproduce the wide range of behavioural phenotypes of this uniquely human disorder, represent a very useful tool. Ketamine administration in early postnatal life of mice has already been studied as a suitable animal model resembling psychotic-like symptoms. Here, we investigated whether ketamine administration, at postnatal days 7, 9 and 11, might induce behavioural features able to mimic ASD typical symptoms in adult mice. To this aim, we developed a 4-days behavioural tests battery, including Marble Burying, Hole Board, Olfactory and Social tests, to assess repetitive and stereotyped behaviour, social deficits and anxiety-like symptoms. Moreover, by using this mouse model, we performed neurochemical and biomolecular analyses, quantifying neurotransmitters belonging to excitatory-inhibitory pathways, such as glutamate, glutamine and gamma-aminobutyric acid (GABA), as well as immune activation biomarkers related to ASD, such as CD11b and glial fibrillary acidic protein (GFAP), in the hippocampus and amygdala. Possible alterations in levels of brain-derived neurotrophic factor (BDNF) expression in the hippocampus and amygdala were also evaluated. Our results showed an increase in stereotyped behaviours, together with social impairments and anxiety-like behaviour in adult mice, receiving ketamine administration in early postnatal life. In addition, we found decreased BDNF and enhanced GFAP hippocampal expression levels, accompanied by elevations in glutamate amount, as well as reduction in GABA content in amygdala and hippocampus. In conclusion, early ketamine administration may represent a suitable animal model of ASD, exhibiting face validity to mimic specific ASD symptoms, such as social deficits, repetitive repertoire and anxiety-like behaviour.
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Affiliation(s)
- Maria Bove
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Stefania Schiavone
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Paolo Tucci
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Vladyslav Sikora
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy; Department of Pathology, Sumy State University, Sumy, Ukraine
| | - Stefania Dimonte
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Anna Laura Colia
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Maria Grazia Morgese
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Luigia Trabace
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy.
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14
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Kalinowska M, van der Lei MB, Kitiashvili M, Mamcarz M, Oliveira MM, Longo F, Klann E. Deletion of Fmr1 in parvalbumin-expressing neurons results in dysregulated translation and selective behavioral deficits associated with fragile X syndrome. Mol Autism 2022; 13:29. [PMID: 35768828 PMCID: PMC9245312 DOI: 10.1186/s13229-022-00509-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 06/10/2022] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Fragile X syndrome (FXS), the most common genetic cause of autism spectrum disorder and intellectual disability, is caused by the lack of fragile X mental retardation protein (FMRP) expression. FMRP is an mRNA binding protein with functions in mRNA transport, localization, and translational control. In Fmr1 knockout mice, dysregulated translation has been linked to pathophysiology, including abnormal synaptic function and dendritic morphology, and autistic-like behavioral phenotypes. The role of FMRP in morphology and function of excitatory neurons has been well studied in mice lacking Fmr1, but the impact of Fmr1 deletion on inhibitory neurons remains less characterized. Moreover, the contribution of FMRP in different cell types to FXS pathophysiology is not well defined. We sought to characterize whether FMRP loss in parvalbumin or somatostatin-expressing neurons results in FXS-like deficits in mice. METHODS We used Cre-lox recombinase technology to generate two lines of conditional knockout mice lacking FMRP in either parvalbumin or somatostatin-expressing cells and carried out a battery of behavioral tests to assess motor function, anxiety, repetitive, stereotypic, social behaviors, and learning and memory. In addition, we used fluorescent non-canonical amino acid tagging along with immunostaining to determine whether de novo protein synthesis is dysregulated in parvalbumin or somatostatin-expressing neurons. RESULTS De novo protein synthesis was elevated in hippocampal parvalbumin and somatostatin-expressing inhibitory neurons in Fmr1 knockout mice. Cell type-specific deletion of Fmr1 in parvalbumin-expressing neurons resulted in anxiety-like behavior, impaired social behavior, and dysregulated de novo protein synthesis. In contrast, deletion of Fmr1 in somatostatin-expressing neurons did not result in behavioral abnormalities and did not significantly impact de novo protein synthesis. This is the first report of how loss of FMRP in two specific subtypes of inhibitory neurons is associated with distinct FXS-like abnormalities. LIMITATIONS The mouse models we generated are limited by whole body knockout of FMRP in parvalbumin or somatostatin-expressing cells and further studies are needed to establish a causal relationship between cellular deficits and FXS-like behaviors. CONCLUSIONS Our findings indicate a cell type-specific role for FMRP in parvalbumin-expressing neurons in regulating distinct behavioral features associated with FXS.
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Affiliation(s)
- Magdalena Kalinowska
- grid.137628.90000 0004 1936 8753Center for Neural Science, New York University, New York, NY USA
| | - Mathijs B. van der Lei
- grid.5284.b0000 0001 0790 3681Department of Medical Genetics, University of Antwerp, Antwerp, Belgium
| | - Michael Kitiashvili
- grid.137628.90000 0004 1936 8753Center for Neural Science, New York University, New York, NY USA
| | - Maggie Mamcarz
- grid.137628.90000 0004 1936 8753Center for Neural Science, New York University, New York, NY USA
| | - Mauricio M. Oliveira
- grid.137628.90000 0004 1936 8753Center for Neural Science, New York University, New York, NY USA
| | - Francesco Longo
- grid.8761.80000 0000 9919 9582Institute for Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden ,grid.8761.80000 0000 9919 9582Wallenberg Centre for Molecular and Translational Medicine, University of Gothenburg, Gothenburg, Sweden
| | - Eric Klann
- Center for Neural Science, New York University, New York, NY, USA. .,NYU Neuroscience Institute, New York University Langone Medical Center, New York, NY, USA.
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15
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Khlaifia A, Honoré E, Artinian J, Laplante I, Lacaille JC. mTORC1 function in hippocampal parvalbumin interneurons: regulation of firing and long-term potentiation of intrinsic excitability but not long-term contextual fear memory and context discrimination. Mol Brain 2022; 15:56. [PMID: 35715811 PMCID: PMC9204956 DOI: 10.1186/s13041-022-00941-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 06/07/2022] [Indexed: 02/03/2023] Open
Abstract
Hippocampal CA1 parvalbumin-expressing interneurons (PV INs) play a central role in controlling principal cell activity and orchestrating network oscillations. PV INs receive excitatory inputs from CA3 Schaffer collaterals and local CA1 pyramidal cells, and they provide perisomatic inhibition. Schaffer collateral excitatory synapses onto PV INs express Hebbian and anti-Hebbian types of long-term potentiation (LTP), as well as elicit LTP of intrinsic excitability (LTPIE). LTPIE requires the activation of type 5 metabotropic glutamate receptors (mGluR5) and is mediated by downregulation of potassium channels Kv1.1. It is sensitive to rapamycin and thus may involve activation of the mammalian target of rapamycin complex 1 (mTORC1). LTPIE facilitates PV INs recruitment in CA1 and maintains an excitatory-inhibitory balance. Impaired CA1 PV INs activity or LTP affects network oscillations and memory. However, whether LTPIE in PV INs plays a role in hippocampus-dependent memory remains unknown. Here, we used conditional deletion of the obligatory component of mTORC1, the Regulatory-Associated Protein of mTOR (Raptor), to directly manipulate mTORC1 in PV INs. We found that homozygous, but not heterozygous, conditional knock-out of Rptor resulted in a decrease in CA1 PV INs of mTORC1 signaling via its downstream effector S6 phosphorylation assessed by immunofluorescence. In whole-cell recordings from hippocampal slices, repetitive firing of CA1 PV INs was impaired in mice with either homozygous or heterozygous conditional knock-out of Rptor. High frequency stimulation of Schaffer collateral inputs that induce LTPIE in PV INs of control mice failed to do so in mice with either heterozygous or homozygous conditional knock-out of Rptor in PV INs. At the behavioral level, mice with homozygous or heterozygous conditional knock-out of Rptor showed similar long-term contextual fear memory or contextual fear memory discrimination relative to control mice. Thus, mTORC1 activity in CA1 PV INs regulates repetitive firing and LTPIE but not consolidation of long-term contextual fear memory and context discrimination. Our results indicate that mTORC1 plays cell-specific roles in synaptic plasticity of hippocampal inhibitory interneurons that are differentially involved in hippocampus-dependent learning and memory.
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Affiliation(s)
- Abdessattar Khlaifia
- Department of Neurosciences, Center for Interdisciplinary Research on Brain and Learning (CIRCA) and Research Group On Neural Signaling and Circuitry (GRSNC), Université de Montréal, P.O. Box 6128, Station Downtown, QC, H3C 3J7, Montreal, Canada.,Department of Psychology, University of Toronto Scarborough, ON, M1C1A4, Toronto, Canada
| | - Eve Honoré
- Department of Neurosciences, Center for Interdisciplinary Research on Brain and Learning (CIRCA) and Research Group On Neural Signaling and Circuitry (GRSNC), Université de Montréal, P.O. Box 6128, Station Downtown, QC, H3C 3J7, Montreal, Canada
| | - Julien Artinian
- Department of Neurosciences, Center for Interdisciplinary Research on Brain and Learning (CIRCA) and Research Group On Neural Signaling and Circuitry (GRSNC), Université de Montréal, P.O. Box 6128, Station Downtown, QC, H3C 3J7, Montreal, Canada.,NeuroService, Neurocentre Magendie , Bordeaux, France
| | - Isabel Laplante
- Department of Neurosciences, Center for Interdisciplinary Research on Brain and Learning (CIRCA) and Research Group On Neural Signaling and Circuitry (GRSNC), Université de Montréal, P.O. Box 6128, Station Downtown, QC, H3C 3J7, Montreal, Canada
| | - Jean-Claude Lacaille
- Department of Neurosciences, Center for Interdisciplinary Research on Brain and Learning (CIRCA) and Research Group On Neural Signaling and Circuitry (GRSNC), Université de Montréal, P.O. Box 6128, Station Downtown, QC, H3C 3J7, Montreal, Canada.
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16
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CXCR2 antagonist SB332235 mitigates deficits in social behavior and dysregulation of Th1/Th22 and T regulatory cell-related transcription factor signaling in male BTBR T+ Itpr3tf/J mouse model of autism. Pharmacol Biochem Behav 2022; 217:173408. [DOI: 10.1016/j.pbb.2022.173408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Revised: 05/19/2022] [Accepted: 05/23/2022] [Indexed: 11/22/2022]
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17
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Wang X, Guo Z, Mei D, Zhang Y, Zhao S, Hu S, Luo S, Wang Q, Gao C. The GluN2B-Trp373 NMDA Receptor Variant is Associated with Autism-, Epilepsy-Related Phenotypes and Reduces NMDA Receptor Currents in Rats. Neurochem Res 2022; 47:1588-1597. [PMID: 35181828 DOI: 10.1007/s11064-022-03554-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Revised: 02/02/2022] [Accepted: 02/07/2022] [Indexed: 11/30/2022]
Abstract
Autism spectrum disorder (ASD) is a neurodevelopmental condition with core clinical features of abnormal communication, social interactions, atypical intelligence, and a higher risk of epilepsy. Prior work has suggested that de novo heterozygous mutations in the GRIN2B gene that encodes the GluN2B subunit of N-methyl-D-aspartic acid receptors are likely linked to ASD. However, whether GLuN2B-Trp373 mutation derived from autistic individuals causes ASD-like behavioral aberrations in rats remains to be determined. Here, through in utero electroporation and in vivo studies, we conducted a battery of tests to examine ASD-associated behaviors, cognitive impairments, and susceptibility to pentylenetetrazol-induced seizures. Whole-cell patch recording was utilized to determine whether the GluN2B-Trp373 mutation influences GluN2B-containing NMDA receptor currents in rats. Results show that, behaviorally, GLuN2B-Trp373 mutant rats exhibited core behavioral manifestations of ASD, such as social interaction deficits, increases in stereotyped behaviors and anxiety stereotyped/repetitive, impaired spatial memory, and enhanced risk of pentylenetetrazol-induced seizures, consistent with many of the hallmarks of low-functioning ASD in humans. Functionally, the GluN2B-Trp373 mutation results in reduced GluN2B surface protein expression together with decreased hippocampal NMDA receptor currents. Collectively, our findings highlight that GluN2B-Trp373 mutations can drive the manifestation of ASD-associated symptoms via the suppression of NMDA receptor currents.
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Affiliation(s)
- Xiaona Wang
- Henan Key Laboratory of Children's Genetics and Metabolic Diseases, Henan Neurodevelopment Engineering Research Center for Children, Children's Hospital Affiliated to Zhengzhou University, 33 Longhu Outer Circle Dong Road, Zhengzhou, 450018, Henan, China.
| | - Zhiyue Guo
- School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang, China
| | - Daoqi Mei
- Department of Neurology, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, China
| | - Yaodong Zhang
- Henan Key Laboratory of Children's Genetics and Metabolic Diseases, Henan Neurodevelopment Engineering Research Center for Children, Children's Hospital Affiliated to Zhengzhou University, 33 Longhu Outer Circle Dong Road, Zhengzhou, 450018, Henan, China
| | - Shuai Zhao
- Henan Key Laboratory of Children's Genetics and Metabolic Diseases, Henan Neurodevelopment Engineering Research Center for Children, Children's Hospital Affiliated to Zhengzhou University, 33 Longhu Outer Circle Dong Road, Zhengzhou, 450018, Henan, China
| | - Shunan Hu
- Henan Key Laboratory of Children's Genetics and Metabolic Diseases, Henan Neurodevelopment Engineering Research Center for Children, Children's Hospital Affiliated to Zhengzhou University, 33 Longhu Outer Circle Dong Road, Zhengzhou, 450018, Henan, China
| | - Shuying Luo
- Henan Key Laboratory of Children's Genetics and Metabolic Diseases, Henan Neurodevelopment Engineering Research Center for Children, Children's Hospital Affiliated to Zhengzhou University, 33 Longhu Outer Circle Dong Road, Zhengzhou, 450018, Henan, China
| | - Qi Wang
- Department of Histology and Embryology, School of Basic Medicine, Guizhou Medical University, Dongqing Road, Guiyang, 550025, Guizhou, China.
| | - Chao Gao
- Department of Rehabilitation, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, China.
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18
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Neurobiology of ARID1B haploinsufficiency related to neurodevelopmental and psychiatric disorders. Mol Psychiatry 2022; 27:476-489. [PMID: 33686214 PMCID: PMC8423853 DOI: 10.1038/s41380-021-01060-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Revised: 02/04/2021] [Accepted: 02/18/2021] [Indexed: 01/31/2023]
Abstract
ARID1B haploinsufficiency is a frequent cause of intellectual disability (ID) and autism spectrum disorder (ASD), and also leads to emotional disturbances. In this review, we examine past and present clinical and preclinical research into the neurobiological function of ARID1B. The presentation of ARID1B-related disorders (ARID1B-RD) is highly heterogeneous, including varying degrees of ID, ASD, and physical features. Recent research includes the development of suitable clinical readiness assessments for the treatment of ARID1B-RD, as well as similar neurodevelopmental disorders. Recently developed mouse models of Arid1b haploinsufficiency successfully mirror many of the behavioral phenotypes of ASD and ID. These animal models have helped to solidify the molecular mechanisms by which ARID1B regulates brain development and function, including epigenetic regulation of the Pvalb gene and promotion of Wnt/β-catenin signaling in neural progenitors in the ventral telencephalon. Finally, preclinical studies have identified the use of a positive allosteric modulator of the GABAA receptor as an effective treatment for some Arid1b haploinsufficiency-related behavioral phenotypes, and there is potential for the refinement of this therapy in order to translate it into clinical use.
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19
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Reduced hippocampal inhibition and enhanced autism-epilepsy comorbidity in mice lacking neuropilin 2. Transl Psychiatry 2021; 11:537. [PMID: 34663783 PMCID: PMC8523694 DOI: 10.1038/s41398-021-01655-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 08/18/2021] [Accepted: 09/17/2021] [Indexed: 12/19/2022] Open
Abstract
The neuropilin receptors and their secreted semaphorin ligands play key roles in brain circuit development by regulating numerous crucial neuronal processes, including the maturation of synapses and migration of GABAergic interneurons. Consistent with its developmental roles, the neuropilin 2 (Nrp2) locus contains polymorphisms in patients with autism spectrum disorder (ASD). Nrp2-deficient mice show autism-like behavioral deficits and propensity to develop seizures. In order to determine the pathophysiology in Nrp2 deficiency, we examined the hippocampal numbers of interneuron subtypes and inhibitory regulation of hippocampal CA1 pyramidal neurons in mice lacking one or both copies of Nrp2. Immunostaining for interneuron subtypes revealed that Nrp2-/- mice have a reduced number of parvalbumin, somatostatin, and neuropeptide Y cells, mainly in CA1. Whole-cell recordings identified reduced firing and hyperpolarized shift in resting membrane potential in CA1 pyramidal neurons from Nrp2+/- and Nrp2-/- mice compared to age-matched wild-type controls indicating decrease in intrinsic excitability. Simultaneously, the frequency and amplitude of spontaneous inhibitory postsynaptic currents (sIPSCs) are reduced in Nrp2-deficient mice. A convulsive dose of kainic acid evoked electrographic and behavioral seizures with significantly shorter latency, longer duration, and higher severity in Nrp2-/- compared to Nrp2+/+ animals. Finally, Nrp2+/- and Nrp2-/- but not Nrp2+/+, mice have impaired cognitive flexibility demonstrated by reward-based reversal learning, a task associated with hippocampal circuit function. Together these data demonstrate a broad reduction in interneuron subtypes and compromised inhibition in CA1 of Nrp2-/- mice, which could contribute to the heightened seizure susceptibility and behavioral deficits consistent with an ASD/epilepsy phenotype.
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Control of the eIF4E activity: structural insights and pharmacological implications. Cell Mol Life Sci 2021; 78:6869-6885. [PMID: 34541613 PMCID: PMC8558276 DOI: 10.1007/s00018-021-03938-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 08/28/2021] [Accepted: 09/08/2021] [Indexed: 12/17/2022]
Abstract
The central role of eukaryotic translation initiation factor 4E (eIF4E) in controlling mRNA translation has been clearly assessed in the last decades. eIF4E function is essential for numerous physiological processes, such as protein synthesis, cellular growth and differentiation; dysregulation of its activity has been linked to ageing, cancer onset and progression and neurodevelopmental disorders, such as autism spectrum disorder (ASD) and Fragile X Syndrome (FXS). The interaction between eIF4E and the eukaryotic initiation factor 4G (eIF4G) is crucial for the assembly of the translational machinery, the initial step of mRNA translation. A well-characterized group of proteins, named 4E-binding proteins (4E-BPs), inhibits the eIF4E–eIF4G interaction by competing for the same binding site on the eIF4E surface. 4E-BPs and eIF4G share a single canonical motif for the interaction with a conserved hydrophobic patch of eIF4E. However, a second non-canonical and not conserved binding motif was recently detected for eIF4G and several 4E-BPs. Here, we review the structural features of the interaction between eIF4E and its molecular partners eIF4G and 4E-BPs, focusing on the implications of the recent structural and biochemical evidence for the development of new therapeutic strategies. The design of novel eIF4E-targeting molecules that inhibit translation might provide new avenues for the treatment of several conditions.
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Regulation of habenular G-protein gamma 8 on learning and memory via modulation of the central acetylcholine system. Mol Psychiatry 2021; 26:3737-3750. [PMID: 32989244 DOI: 10.1038/s41380-020-00893-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 08/24/2020] [Accepted: 09/15/2020] [Indexed: 01/19/2023]
Abstract
Guanine nucleotide binding protein (G protein) gamma 8 (Gng8) is a subunit of G proteins and expressed in the medial habenula (MHb) and interpeduncular nucleus (IPN). Recent studies have demonstrated that Gng8 is involved in brain development; however, the roles of Gng8 on cognitive function have not yet been addressed. In the present study, we investigated the expression of Gng8 in the brain and found that Gng8 was predominantly expressed in the MHb-IPN circuit of the mouse brain. We generated Gng8 knockout (KO) mice by CRISPR/Cas9 system in order to assess the role of Gng8 on cognitive function. Gng8 KO mice exhibited deficiency in learning and memory in passive avoidance and Morris water maze tests. In addition, Gng8 KO mice significantly reduced long-term potentiation (LTP) in the hippocampus compared to that of wild-type (WT) mice. Furthermore, we observed that levels of acetylcholine (ACh) and choline acetyltransferase (ChAT) in the MHb and IPN of Gng8 KO mice were significantly decreased, compared to WT mice. The administration of nAChR α4β2 agonist A85380 rescued memory impairment in the Gng8 KO mice, suggesting that Gng8 regulates cognitive function via modulation of cholinergic activity. Taken together, Gng8 is a potential therapeutic target for memory-related diseases and/or neurodevelopmental diseases.
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Wang X, Gao C, Zhang Y, Hu S, Qiao Y, Zhao Z, Gou L, Song J, Wang Q. Overexpression of mGluR7 in the Prefrontal Cortex Attenuates Autistic Behaviors in Mice. Front Cell Neurosci 2021; 15:689611. [PMID: 34335187 PMCID: PMC8319395 DOI: 10.3389/fncel.2021.689611] [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: 04/01/2021] [Accepted: 06/24/2021] [Indexed: 11/13/2022] Open
Abstract
Autism spectrum disorder (ASD) is associated with a range of abnormalities pertaining to socialization, communication, repetitive behaviors, and restricted interests. Owing to its complexity, the etiology of ASD remains incompletely understood. The presynaptic G protein-coupled glutamate receptor metabotropic glutamate receptor 7 (mGluR7) is known to be essential for synaptic transmission and is also tightly linked with ASD incidence. Herein, we report that prefrontal cortex (PFC) mGluR7 protein levels were decreased in C57BL/6J mice exposed to valproic acid (VPA) and BTBR T+ Itpr3tf/J mice. The overexpression of mGluR7 in the PFC of these mice using a lentiviral vector was sufficient to reduce the severity of ASD-like behavioral patterns such that animals exhibited decreases in abnormal social interactions and communication, anxiety-like, and stereotyped/repetitive behaviors. Intriguingly, patch-clamp recordings revealed that the overexpression of mGluR7 suppressed neuronal excitability by inhibiting action potential discharge frequencies, together with enhanced action potential threshold and increased rheobase. These data offer a scientific basis for the additional study of mGluR7 as a promising therapeutic target in ASD and related neurodevelopmental disorders.
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Affiliation(s)
- Xiaona Wang
- Department of Nuclear Medicine, Affiliated Hospital of Guangdong Medical College, Zhanjiang, China
| | - Chao Gao
- Department of Rehabilitation, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, China
| | - Yaodong Zhang
- Department of Nuclear Medicine, Affiliated Hospital of Guangdong Medical College, Zhanjiang, China
| | - Shunan Hu
- Department of Nuclear Medicine, Affiliated Hospital of Guangdong Medical College, Zhanjiang, China
| | - Yidan Qiao
- Department of Pathology, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, China
| | - Zhengqin Zhao
- Department of Nuclear Medicine, Affiliated Hospital of Guangdong Medical College, Zhanjiang, China
| | - Lingshan Gou
- Center for Genetic Medicine, Xuzhou Maternity and Child Health Care Hospital, Xuzhou, China
| | - Jijun Song
- Henan Infectious Disease Hospital, The Sixth People's Hospital of Zhengzhou, Zhengzhou, China
| | - Qi Wang
- Department of Histology and Embryology, Guizhou Medical University, Guizhou, China
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Wang X, Yang Z, Fang S, Zhang Y, Guo J, Gou L. Declining Levels of Specialized Synaptic Surface Proteins in nNOS-Expressing Interneurons in Mice Treated Prenatally with Valproic Acid. Neurochem Res 2021; 46:1794-1800. [PMID: 33876374 DOI: 10.1007/s11064-021-03326-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Revised: 03/12/2021] [Accepted: 04/09/2021] [Indexed: 11/27/2022]
Abstract
Autism spectrum disorder (ASD) is a heterogeneous group of neurodevelopmental disorder characterized by impaired social interaction, and repetitive or restricted interests and behaviors. Membrane proteins are a significant part of the proteins in cell and play key functions in synaptic transmission. We have recently shown that neuronal nitric oxide synthase (nNOS) expression was reduced in the basolateral amygdala (BLA) of mice following postnatal valproic acid (VPA) exposure. In the current study, we utilized a label-free proteomics approach to identify and quantify surface protein expression in nNOS-positive interneurons between VPA-treated and control mice. Western blot was used to confirm the expression of selected membrane proteins. Our proteomics data revealed differentially expressed surface proteins in nNOS interneurons, e.g. Narp, AMPA-type glutamate (AMPA) receptor subunit GluA4 and Protein kinase C gamma (PKCγ), which were validated by Western blotting in mice treated with VPA. This work will pave the way for further elucidation of the mechanisms of these differentially membrane proteins in nNOS interneurons-medicated ASD.
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Affiliation(s)
- Xiaona Wang
- Henan Provincial Key Laboratory of Children's Genetics and Metabolic Diseases, Henan Engineering Research Center of Childhood Neurodevelopment, Children's Hospital Affiliated to Zhengzhou University, 33 Longhu Outer Circle Dong Road, Zhengzhou, 450018, Henan, China.
| | - Zhigang Yang
- Department of Neurology, Children's Hospital Affiliated to Zhengzhou University, 33 Longhu Outer Circle Dong Road, Zhengzhou, 450018, Henan, China
| | - Shuanfeng Fang
- Healthcare Department, Children's Hospital Affiliated to Zhengzhou University, 33 Longhu Outer Circle Dong Road, Zhengzhou, 450018, Henan, China
| | - Yaodong Zhang
- Henan Provincial Key Laboratory of Children's Genetics and Metabolic Diseases, Henan Engineering Research Center of Childhood Neurodevelopment, Children's Hospital Affiliated to Zhengzhou University, 33 Longhu Outer Circle Dong Road, Zhengzhou, 450018, Henan, China
| | - Jisheng Guo
- School of Basic Medical Sciences, Yantai Campus of Binzhou Medical University, 346 Guanhai Road, Laishan District, Yantai City, 264003, Shandong, China
| | - Lingshan Gou
- Center for Genetic Medicine, Xuzhou Maternity and Child Health Care Hospital, Xuzhou, China
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4E-BP2-dependent translation in parvalbumin neurons controls epileptic seizure threshold. Proc Natl Acad Sci U S A 2021; 118:2025522118. [PMID: 33876772 DOI: 10.1073/pnas.2025522118] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The mechanistic/mammalian target of rapamycin complex 1 (mTORC1) integrates multiple signals to regulate critical cellular processes such as mRNA translation, lipid biogenesis, and autophagy. Germline and somatic mutations in mTOR and genes upstream of mTORC1, such as PTEN, TSC1/2, AKT3, PIK3CA, and components of GATOR1 and KICSTOR complexes, are associated with various epileptic disorders. Increased mTORC1 activity is linked to the pathophysiology of epilepsy in both humans and animal models, and mTORC1 inhibition suppresses epileptogenesis in humans with tuberous sclerosis and animal models with elevated mTORC1 activity. However, the role of mTORC1-dependent translation and the neuronal cell types mediating the effect of enhanced mTORC1 activity in seizures remain unknown. The eukaryotic translation initiation factor 4E-binding protein 1 (4E-BP1) and 2 (4E-BP2) are translational repressors downstream of mTORC1. Here we show that the ablation of 4E-BP2, but not 4E-BP1, in mice increases the sensitivity to pentylenetetrazole (PTZ)- and kainic acid (KA)-induced seizures. We demonstrate that the deletion of 4E-BP2 in inhibitory, but not excitatory neurons, causes an increase in the susceptibility to PTZ-induced seizures. Moreover, mice lacking 4E-BP2 in parvalbumin, but not somatostatin or VIP inhibitory neurons exhibit a lowered threshold for seizure induction and reduced number of parvalbumin neurons. A mouse model harboring a human PIK3CA mutation that enhances the activity of the PI3K-AKT pathway (Pik3ca H1047R-Pvalb ) selectively in parvalbumin neurons shows susceptibility to PTZ-induced seizures. Our data identify 4E-BP2 as a regulator of epileptogenesis and highlight the central role of increased mTORC1-dependent translation in parvalbumin neurons in the pathophysiology of epilepsy.
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Hooshmandi M, Truong VT, Fields E, Thomas RE, Wong C, Sharma V, Gantois I, Soriano Roque P, Chalkiadaki K, Wu N, Chakraborty A, Tahmasebi S, Prager-Khoutorsky M, Sonenberg N, Suvrathan A, Watt AJ, Gkogkas CG, Khoutorsky A. 4E-BP2-dependent translation in cerebellar Purkinje cells controls spatial memory but not autism-like behaviors. Cell Rep 2021; 35:109036. [PMID: 33910008 DOI: 10.1016/j.celrep.2021.109036] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 02/15/2021] [Accepted: 04/06/2021] [Indexed: 11/19/2022] Open
Abstract
Recent studies have demonstrated that selective activation of mammalian target of rapamycin complex 1 (mTORC1) in the cerebellum by deletion of the mTORC1 upstream repressors TSC1 or phosphatase and tensin homolog (PTEN) in Purkinje cells (PCs) causes autism-like features and cognitive deficits. However, the molecular mechanisms by which overactivated mTORC1 in the cerebellum engenders these behaviors remain unknown. The eukaryotic translation initiation factor 4E-binding protein 2 (4E-BP2) is a central translational repressor downstream of mTORC1. Here, we show that mice with selective ablation of 4E-BP2 in PCs display a reduced number of PCs, increased regularity of PC action potential firing, and deficits in motor learning. Surprisingly, although spatial memory is impaired in these mice, they exhibit normal social interaction and show no deficits in repetitive behavior. Our data suggest that, downstream of mTORC1/4E-BP2, there are distinct cerebellar mechanisms independently controlling social behavior and memory formation.
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Affiliation(s)
- Mehdi Hooshmandi
- Department of Anesthesia and Faculty of Dentistry, McGill University, Montreal, QC H3G 1Y6, Canada
| | - Vinh Tai Truong
- Department of Biochemistry and Goodman Cancer Research Centre, McGill University, Montreal, QC H3A 1A3, Canada
| | - Eviatar Fields
- Department of Biology, McGill University, Montreal, QC H3A 1A3, Canada; Integrated Program in Neuroscience, McGill University, Montreal, QC H3A 2B4, Canada
| | - Riya Elizabeth Thomas
- Integrated Program in Neuroscience, McGill University, Montreal, QC H3A 2B4, Canada; Centre for Research in Neuroscience, Research Institute of the McGill University Health Centre, Montreal QC, H3G1A4, Canada; Department of Neurology and Neurosurgery, Department of Pediatrics, McGill University, Montreal QC, H3G1A4, Canada
| | - Calvin Wong
- Department of Anesthesia and Faculty of Dentistry, McGill University, Montreal, QC H3G 1Y6, Canada
| | - Vijendra Sharma
- Department of Biochemistry and Goodman Cancer Research Centre, McGill University, Montreal, QC H3A 1A3, Canada
| | - Ilse Gantois
- Department of Biochemistry and Goodman Cancer Research Centre, McGill University, Montreal, QC H3A 1A3, Canada
| | - Patricia Soriano Roque
- Department of Anesthesia and Faculty of Dentistry, McGill University, Montreal, QC H3G 1Y6, Canada
| | - Kleanthi Chalkiadaki
- Division of Biomedical Research, Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, University Campus, 45110 Ioannina, Greece
| | - Neil Wu
- Department of Anesthesia and Faculty of Dentistry, McGill University, Montreal, QC H3G 1Y6, Canada
| | - Anindyo Chakraborty
- Department of Anesthesia and Faculty of Dentistry, McGill University, Montreal, QC H3G 1Y6, Canada
| | - Soroush Tahmasebi
- Department of Pharmacology and Regenerative Medicine, University of Illinois at Chicago, Chicago, IL 60612, USA
| | | | - Nahum Sonenberg
- Department of Biochemistry and Goodman Cancer Research Centre, McGill University, Montreal, QC H3A 1A3, Canada
| | - Aparna Suvrathan
- Centre for Research in Neuroscience, Research Institute of the McGill University Health Centre, Montreal QC, H3G1A4, Canada; Department of Neurology and Neurosurgery, Department of Pediatrics, McGill University, Montreal QC, H3G1A4, Canada
| | - Alanna J Watt
- Department of Biology, McGill University, Montreal, QC H3A 1A3, Canada
| | - Christos G Gkogkas
- Division of Biomedical Research, Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, University Campus, 45110 Ioannina, Greece.
| | - Arkady Khoutorsky
- Department of Anesthesia and Faculty of Dentistry, McGill University, Montreal, QC H3G 1Y6, Canada; Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC H3A 0G1, Canada.
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26
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Vaes JEG, Kosmeijer CM, Kaal M, van Vliet R, Brandt MJV, Benders MJNL, Nijboer CH. Regenerative Therapies to Restore Interneuron Disturbances in Experimental Models of Encephalopathy of Prematurity. Int J Mol Sci 2020; 22:ijms22010211. [PMID: 33379239 PMCID: PMC7795049 DOI: 10.3390/ijms22010211] [Citation(s) in RCA: 4] [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: 10/26/2020] [Revised: 12/22/2020] [Accepted: 12/23/2020] [Indexed: 12/22/2022] Open
Abstract
Encephalopathy of Prematurity (EoP) is a major cause of morbidity in (extreme) preterm neonates. Though the majority of EoP research has focused on failure of oligodendrocyte maturation as an underlying pathophysiological mechanism, recent pioneer work has identified developmental disturbances in inhibitory interneurons to contribute to EoP. Here we investigated interneuron abnormalities in two experimental models of EoP and explored the potential of two promising treatment strategies, namely intranasal mesenchymal stem cells (MSCs) or insulin-like growth factor I (IGF1), to restore interneuron development. In rats, fetal inflammation and postnatal hypoxia led to a transient increase in total cortical interneuron numbers, with a layer-specific deficit in parvalbumin (PV)+ interneurons. Additionally, a transient excess of total cortical cell density was observed, including excitatory neuron numbers. In the hippocampal cornu ammonis (CA) 1 region, long-term deficits in total interneuron numbers and PV+ subtype were observed. In mice subjected to postnatal hypoxia/ischemia and systemic inflammation, total numbers of cortical interneurons remained unaffected; however, subtype analysis revealed a global, transient reduction in PV+ cells and a long-lasting layer-specific increase in vasoactive intestinal polypeptide (VIP)+ cells. In the dentate gyrus, a long-lasting deficit of somatostatin (SST)+ cells was observed. Both intranasal MSC and IGF1 therapy restored the majority of interneuron abnormalities in EoP mice. In line with the histological findings, EoP mice displayed impaired social behavior, which was partly restored by the therapies. In conclusion, induction of experimental EoP is associated with model-specific disturbances in interneuron development. In addition, intranasal MSCs and IGF1 are promising therapeutic strategies to aid interneuron development after EoP.
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Affiliation(s)
- Josine E. G. Vaes
- Department for Developmental Origins of Disease, University Medical Center Utrecht Brain Center and Wilhelmina Children’s Hospital, Utrecht University, 3584 Utrecht, The Netherlands; (J.E.G.V.); (C.M.K.); (M.K.); (R.v.V.); (M.J.V.B.)
- Department of Neonatology, University Medical Center Utrecht Brain Center and Wilhelmina Children’s Hospital, Utrecht University, 3584 Utrecht, The Netherlands;
| | - Chantal M. Kosmeijer
- Department for Developmental Origins of Disease, University Medical Center Utrecht Brain Center and Wilhelmina Children’s Hospital, Utrecht University, 3584 Utrecht, The Netherlands; (J.E.G.V.); (C.M.K.); (M.K.); (R.v.V.); (M.J.V.B.)
| | - Marthe Kaal
- Department for Developmental Origins of Disease, University Medical Center Utrecht Brain Center and Wilhelmina Children’s Hospital, Utrecht University, 3584 Utrecht, The Netherlands; (J.E.G.V.); (C.M.K.); (M.K.); (R.v.V.); (M.J.V.B.)
| | - Rik van Vliet
- Department for Developmental Origins of Disease, University Medical Center Utrecht Brain Center and Wilhelmina Children’s Hospital, Utrecht University, 3584 Utrecht, The Netherlands; (J.E.G.V.); (C.M.K.); (M.K.); (R.v.V.); (M.J.V.B.)
| | - Myrna J. V. Brandt
- Department for Developmental Origins of Disease, University Medical Center Utrecht Brain Center and Wilhelmina Children’s Hospital, Utrecht University, 3584 Utrecht, The Netherlands; (J.E.G.V.); (C.M.K.); (M.K.); (R.v.V.); (M.J.V.B.)
| | - Manon J. N. L. Benders
- Department of Neonatology, University Medical Center Utrecht Brain Center and Wilhelmina Children’s Hospital, Utrecht University, 3584 Utrecht, The Netherlands;
| | - Cora H. Nijboer
- Department for Developmental Origins of Disease, University Medical Center Utrecht Brain Center and Wilhelmina Children’s Hospital, Utrecht University, 3584 Utrecht, The Netherlands; (J.E.G.V.); (C.M.K.); (M.K.); (R.v.V.); (M.J.V.B.)
- Correspondence: ; Tel.: +31-88-755-4360
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The eIF4E homolog 4EHP (eIF4E2) regulates hippocampal long-term depression and impacts social behavior. Mol Autism 2020; 11:92. [PMID: 33225984 PMCID: PMC7682028 DOI: 10.1186/s13229-020-00394-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 10/23/2020] [Indexed: 12/27/2022] Open
Abstract
Background The regulation of protein synthesis is a critical step in gene expression, and its dysfunction is implicated in autism spectrum disorder (ASD). The eIF4E homologous protein (4EHP, also termed eIF4E2) binds to the mRNA 5′ cap to repress translation. The stability of 4EHP is maintained through physical interaction with GRB10 interacting GYF protein 2 (GIGYF2). Gene-disruptive mutations in GIGYF2 are linked to ASD, but causality is lacking. We hypothesized that GIGYF2 mutations cause ASD by disrupting 4EHP function. Methods Since homozygous deletion of either gene is lethal, we generated a cell-type-specific knockout model where Eif4e2 (the gene encoding 4EHP) is deleted in excitatory neurons of the forebrain (4EHP-eKO). In this model, we investigated ASD-associated synaptic plasticity dysfunction, ASD-like behaviors, and global translational control. We also utilized mice lacking one copy of Gigyf2, Eif4e2 or co-deletion of one copy of each gene to further investigate ASD-like behaviors. Results 4EHP is expressed in excitatory neurons and synaptosomes, and its amount increases during development. 4EHP-eKO mice display exaggerated mGluR-LTD, a phenotype frequently observed in mouse models of ASD. Consistent with synaptic plasticity dysfunction, the mice displayed social behavior impairments without being confounded by deficits in olfaction, anxiety, locomotion, or motor ability. Repetitive behaviors and vocal communication were not affected by loss of 4EHP in excitatory neurons. Heterozygous deletion of either Gigyf2, Eif4e2, or both genes in mice did not result in ASD-like behaviors (i.e. decreases in social behavior or increases in marble burying). Interestingly, exaggerated mGluR-LTD and impaired social behaviors were not attributed to changes in hippocampal global protein synthesis, which suggests that 4EHP and GIGYF2 regulate the translation of specific mRNAs to mediate these effects. Limitations This study did not identify which genes are translationally regulated by 4EHP and GIGYF2. Identification of mistranslated genes in 4EHP-eKO mice might provide a mechanistic explanation for the observed impairment in social behavior and exaggerated LTD. Future experiments employing affinity purification of translating ribosomes and mRNA sequencing in 4EHP-eKO mice will address this relevant issue. Conclusions Together these results demonstrate an important role of 4EHP in regulating hippocampal plasticity and ASD-associated social behaviors, consistent with the link between mutations in GIGYF2 and ASD.
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Khalid M, Raza H, M. Driessen T, J. Lee P, Tejwani L, Sami A, Nawaz M, Mehmood Baig S, Lim J, Kaukab Raja G. Genetic Risk of Autism Spectrum Disorder in a Pakistani Population. Genes (Basel) 2020; 11:genes11101206. [PMID: 33076578 PMCID: PMC7602870 DOI: 10.3390/genes11101206] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 09/29/2020] [Accepted: 10/13/2020] [Indexed: 12/13/2022] Open
Abstract
Autism spectrum disorder (ASD) is a group of complex multifactorial neurodevelopmental and neuropsychiatric disorders in children characterized by impairment of communication and social interaction. Several genes with associated single nucleotide polymorphisms (SNPs) have been identified for ASD in different genetic association studies, meta-analyses, and genome-wide association studies (GWAS). However, associations between different SNPs and ASD vary from population to population. Four SNPs in genes CNTNAP2, EIF4E, ATP2B2, CACNA1C, and SNP rs4307059 (which is found between CDH9 and CDH10 genes) have been identified and reported as candidate risk factors for ASD. The aim of the present study was, for the first time, to assess the association of SNPs in these genes with ASD in the Pakistani population. PCR-based genotyping was performed using allele-specific primers in 93 ASD and 93 control Pakistani individuals. All genetic associations, genotype frequencies, and allele frequencies were computed as odds’ ratios (ORs) using logistic regression with a threshold of p ≤ 0.01 to determine statistical significance. We found that the homozygous genotypes of mutant T alleles of CNTNAP2 and ATP2B2 were significantly associated with Pakistani ASD patients in unadjusted ORs (p < 0.01), but their significance score was lost in the adjusted model. Other SNPs such as rs4307059, rs17850950 of EIF4E, and rs1006737 of CACNA1C were not statistically significant. Based on this, we conclude that SNPs are not associated with, or are not the main cause of, autism in the Pakistani population, indicating the involvement of additional players, which need to be investigated in future studies in a large population size. One of the limitations of present study is its small sample size. However, this study, being the first on Pakistani ASD patients, may lay the foundations for future studies in larger samples.
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Affiliation(s)
- Madiha Khalid
- Department of Biochemistry, University Institute of Biochemistry and Biotechnology, PMAS Arid Agriculture University, Rawalpindi 46000, Pakistan; (M.K.); (A.S.)
- Department of Genetics, Yale School of Medicine, New Haven, CT 06510, USA;
| | - Hashim Raza
- Pakistan Institute of Medical Sciences, Islamabad 44000, Pakistan;
| | - Terri M. Driessen
- Department of Genetics, Yale School of Medicine, New Haven, CT 06510, USA;
| | - Paul J. Lee
- Interdepartmental Neuroscience Program, Yale School of Medicine, New Haven, CT 06510, USA; (P.J.L.); (L.T.)
| | - Leon Tejwani
- Interdepartmental Neuroscience Program, Yale School of Medicine, New Haven, CT 06510, USA; (P.J.L.); (L.T.)
| | - Abdul Sami
- Department of Biochemistry, University Institute of Biochemistry and Biotechnology, PMAS Arid Agriculture University, Rawalpindi 46000, Pakistan; (M.K.); (A.S.)
| | - Muhammad Nawaz
- Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, 41346 Gothenburg, Sweden;
| | - Shahid Mehmood Baig
- Human Molecular Genetics Laboratory, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad 38000, Pakistan;
| | - Janghoo Lim
- Department of Genetics, Yale School of Medicine, New Haven, CT 06510, USA;
- Interdepartmental Neuroscience Program, Yale School of Medicine, New Haven, CT 06510, USA; (P.J.L.); (L.T.)
- Department of Neuroscience, Yale School of Medicine, New Haven, CT 06510, USA
- Program in Cellular Neuroscience, Neurodegeneration and Repair, Yale School of Medicine, New Haven, CT 06510, USA
- Yale Stem Cell Center, Yale School of Medicine, New Haven, CT 06510, USA
- Correspondence: (J.L.); (G.K.R.); Tel.: +1-203-737-6268 (J.L.); +92-(051)-9062-742 (G.K.R.)
| | - Ghazala Kaukab Raja
- Department of Biochemistry, University Institute of Biochemistry and Biotechnology, PMAS Arid Agriculture University, Rawalpindi 46000, Pakistan; (M.K.); (A.S.)
- Correspondence: (J.L.); (G.K.R.); Tel.: +1-203-737-6268 (J.L.); +92-(051)-9062-742 (G.K.R.)
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Schieweck R, Ninkovic J, Kiebler MA. RNA-binding proteins balance brain function in health and disease. Physiol Rev 2020; 101:1309-1370. [PMID: 33000986 DOI: 10.1152/physrev.00047.2019] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Posttranscriptional gene expression including splicing, RNA transport, translation, and RNA decay provides an important regulatory layer in many if not all molecular pathways. Research in the last decades has positioned RNA-binding proteins (RBPs) right in the center of posttranscriptional gene regulation. Here, we propose interdependent networks of RBPs to regulate complex pathways within the central nervous system (CNS). These are involved in multiple aspects of neuronal development and functioning, including higher cognition. Therefore, it is not sufficient to unravel the individual contribution of a single RBP and its consequences but rather to study and understand the tight interplay between different RBPs. In this review, we summarize recent findings in the field of RBP biology and discuss the complex interplay between different RBPs. Second, we emphasize the underlying dynamics within an RBP network and how this might regulate key processes such as neurogenesis, synaptic transmission, and synaptic plasticity. Importantly, we envision that dysfunction of specific RBPs could lead to perturbation within the RBP network. This would have direct and indirect (compensatory) effects in mRNA binding and translational control leading to global changes in cellular expression programs in general and in synaptic plasticity in particular. Therefore, we focus on RBP dysfunction and how this might cause neuropsychiatric and neurodegenerative disorders. Based on recent findings, we propose that alterations in the entire regulatory RBP network might account for phenotypic dysfunctions observed in complex diseases including neurodegeneration, epilepsy, and autism spectrum disorders.
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Affiliation(s)
- Rico Schieweck
- Biomedical Center (BMC), Department for Cell Biology and Anatomy, Medical Faculty, Ludwig-Maximilians-University, Planegg-Martinsried, Germany
| | - Jovica Ninkovic
- Biomedical Center (BMC), Department for Cell Biology and Anatomy, Medical Faculty, Ludwig-Maximilians-University, Planegg-Martinsried, Germany
| | - Michael A Kiebler
- Biomedical Center (BMC), Department for Cell Biology and Anatomy, Medical Faculty, Ludwig-Maximilians-University, Planegg-Martinsried, Germany
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Hooshmandi M, Wong C, Khoutorsky A. Dysregulation of translational control signaling in autism spectrum disorders. Cell Signal 2020; 75:109746. [PMID: 32858122 DOI: 10.1016/j.cellsig.2020.109746] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 08/17/2020] [Accepted: 08/18/2020] [Indexed: 11/27/2022]
Abstract
Deviations from the optimal level of mRNA translation are linked to disorders with high rates of autism. Loss of function mutations in genes encoding translational repressors such as PTEN, TSC1, TSC2, and FMRP are associated with autism spectrum disorders (ASDs) in humans and their deletion in animals recapitulates many ASD-like phenotypes. Importantly, the activity of key translational control signaling pathways such as PI3K-mTORC1 and ERK is frequently dysregulated in autistic patients and animal models and their normalization rescues many abnormal phenotypes, suggesting a causal relationship. Mutations in several genes encoding proteins not directly involved in translational control have also been shown to mediate ASD phenotypes via altered signaling upstream of translation. This raises the possibility that the dysregulation of translational control signaling is a converging mechanism not only in familiar but also in sporadic forms of autism. Here, we overview the current knowledge on translational signaling in ASD and highlight how correcting the activity of key pathways upstream of translation reverses distinct ASD-like phenotypes.
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Affiliation(s)
- Mehdi Hooshmandi
- Department of Anesthesia, Faculty of Dentistry, McGill University, Montreal, QC H3A 0G1, Canada
| | - Calvin Wong
- Department of Anesthesia, Faculty of Dentistry, McGill University, Montreal, QC H3A 0G1, Canada
| | - Arkady Khoutorsky
- Department of Anesthesia, Faculty of Dentistry, McGill University, Montreal, QC H3A 0G1, Canada.
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31
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Fleiss B, Gressens P, Stolp HB. Cortical Gray Matter Injury in Encephalopathy of Prematurity: Link to Neurodevelopmental Disorders. Front Neurol 2020; 11:575. [PMID: 32765390 PMCID: PMC7381224 DOI: 10.3389/fneur.2020.00575] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 05/19/2020] [Indexed: 12/16/2022] Open
Abstract
Preterm-born infants frequently suffer from an array of neurological damage, collectively termed encephalopathy of prematurity (EoP). They also have an increased risk of presenting with a neurodevelopmental disorder (e.g., autism spectrum disorder; attention deficit hyperactivity disorder) later in life. It is hypothesized that it is the gray matter injury to the cortex, in addition to white matter injury, in EoP that is responsible for the altered behavior and cognition in these individuals. However, although it is established that gray matter injury occurs in infants following preterm birth, the exact nature of these changes is not fully elucidated. Here we will review the current state of knowledge in this field, amalgamating data from both clinical and preclinical studies. This will be placed in the context of normal processes of developmental biology and the known pathophysiology of neurodevelopmental disorders. Novel diagnostic and therapeutic tactics required integration of this information so that in the future we can combine mechanism-based approaches with patient stratification to ensure the most efficacious and cost-effective clinical practice.
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Affiliation(s)
- Bobbi Fleiss
- School of Health and Biomedical Sciences, RMIT University, Bundoora, VIC, Australia
- Université de Paris, NeuroDiderot, Inserm, Paris, France
- PremUP, Paris, France
- Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
| | - Pierre Gressens
- Université de Paris, NeuroDiderot, Inserm, Paris, France
- PremUP, Paris, France
- Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
| | - Helen B. Stolp
- Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
- Comparative Biomedical Sciences, Royal Veterinary College, London, United Kingdom
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32
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Cook AA, Fields E, Watt AJ. Losing the Beat: Contribution of Purkinje Cell Firing Dysfunction to Disease, and Its Reversal. Neuroscience 2020; 462:247-261. [PMID: 32554108 DOI: 10.1016/j.neuroscience.2020.06.008] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 06/01/2020] [Accepted: 06/05/2020] [Indexed: 02/06/2023]
Abstract
The cerebellum is a brain structure that is highly interconnected with other brain regions. There are many contributing factors to cerebellar-related brain disease, such as altered afferent input, local connectivity, and/or cerebellar output. Purkinje cells (PC) are the principle cells of the cerebellar cortex, and fire intrinsically; that is, they fire spontaneous action potentials at high frequencies. This review paper focuses on PC intrinsic firing activity, which is altered in multiple neurological diseases, including ataxia, Huntington Disease (HD) and autism spectrum disorder (ASD). Notably, there are several cases where interventions that restore or rescue PC intrinsic activity also improve impaired behavior in these mouse models of disease. These findings suggest that rescuing PC firing deficits themselves may be sufficient to improve impairment in cerebellar-related behavior in disease. We propose that restoring PC intrinsic firing represents a good target for drug development that might be of therapeutic use for several disorders.
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Affiliation(s)
- Anna A Cook
- Department of Biology, McGill University, Montreal, Canada
| | - Eviatar Fields
- Department of Biology, McGill University, Montreal, Canada; Integrated Program in Neuroscience, McGill University, Montreal, Canada
| | - Alanna J Watt
- Department of Biology, McGill University, Montreal, Canada.
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Wiebe S, Nagpal A, Sonenberg N. Dysregulated translational control in brain disorders: from genes to behavior. Curr Opin Genet Dev 2020; 65:34-41. [PMID: 32535350 DOI: 10.1016/j.gde.2020.05.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 04/20/2020] [Accepted: 05/03/2020] [Indexed: 12/24/2022]
Abstract
Control of protein synthesis (mRNA translation) is essential for proper brain development and function. Perturbations to the mechanisms governing mRNA translation have repeatedly been shown to constitute a neurodegenerative, neuropsychiatric, and neurodevelopmental disorder risk factor. Developing effective therapeutics for brain disorders will require a better understanding of the molecular mechanisms underlying the control of protein synthesis in brain function. Studies using transgenic animal models have been invaluable towards this end, providing exciting new insights into the genetic basis of brain disorders with hopeful prospects for new and effective treatment options.
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Affiliation(s)
- Shane Wiebe
- Department of Biochemistry, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Montreal, QC H3G 1Y6, Canada; Goodman Cancer Research Centre, 1160 Pine Avenue West, Montreal, QC H3A 1A3, Canada
| | - Anmol Nagpal
- Department of Biochemistry, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Montreal, QC H3G 1Y6, Canada; Goodman Cancer Research Centre, 1160 Pine Avenue West, Montreal, QC H3A 1A3, Canada; Integrated Program in Neuroscience, McGill University, Montreal Neurological Institute, 3801 University Street, Montreal, QC H3A 2B4, Canada
| | - Nahum Sonenberg
- Department of Biochemistry, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Montreal, QC H3G 1Y6, Canada; Goodman Cancer Research Centre, 1160 Pine Avenue West, Montreal, QC H3A 1A3, Canada.
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34
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Han S, Nandy P, Austria Q, Siedlak SL, Torres S, Fujioka H, Wang W, Zhu X. Mfn2 Ablation in the Adult Mouse Hippocampus and Cortex Causes Neuronal Death. Cells 2020; 9:E116. [PMID: 31947766 PMCID: PMC7017224 DOI: 10.3390/cells9010116] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 12/24/2019] [Accepted: 12/30/2019] [Indexed: 01/01/2023] Open
Abstract
It is believed that mitochondrial fragmentation cause mitochondrial dysfunction and neuronal deficits in Alzheimer's disease. We recently reported that constitutive knockout of the mitochondria fusion protein mitofusin2 (Mfn2) in the mouse brain causes mitochondrial fragmentation and neurodegeneration in the hippocampus and cortex. Here, we utilize an inducible mouse model to knock out Mfn2 (Mfn2 iKO) in adult mouse hippocampal and cortical neurons to avoid complications due to developmental changes. Electron microscopy shows the mitochondria become swollen with disorganized and degenerated cristae, accompanied by increased oxidative damage 8 weeks after induction, yet the neurons appear normal at the light level. At later timepoints, increased astrocyte and microglia activation appear and nuclei become shrunken and pyknotic. Apoptosis (Terminal deoxynucleotidyl transferase dUTP nick end labeling, TUNEL) begins to occur at 9 weeks, and by 12 weeks, most hippocampal neurons are degenerated, confirmed by loss of NeuN. Prior to the loss of NeuN, aberrant cell-cycle events as marked by proliferating cell nuclear antigen (PCNA) and pHistone3 were evident in some Mfn2 iKO neurons but do not colocalize with TUNEL signals. Thus, this study demonstrated that Mfn2 ablation and mitochondrial fragmentation in adult neurons cause neurodegeneration through oxidative stress and neuroinflammation in vivo via both apoptosis and aberrant cell-cycle-event-dependent cell death pathways.
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Affiliation(s)
- Song Han
- Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA
- Department of Pathophysiology, School of Basic Medical Sciences, Wuhan University, Wuhan 430072, China
| | - Priya Nandy
- Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Quillan Austria
- Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Sandra L. Siedlak
- Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Sandy Torres
- Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Hisashi Fujioka
- Electron Microscopy Core Facility, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Wenzhang Wang
- Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Xiongwei Zhu
- Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA
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