1
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Radulescu CI, Doostdar N, Zabouri N, Melgosa-Ecenarro L, Wang X, Sadeh S, Pavlidi P, Airey J, Kopanitsa M, Clopath C, Barnes SJ. Age-related dysregulation of homeostatic control in neuronal microcircuits. Nat Neurosci 2023; 26:2158-2170. [PMID: 37919424 PMCID: PMC10689243 DOI: 10.1038/s41593-023-01451-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 09/06/2023] [Indexed: 11/04/2023]
Abstract
Neuronal homeostasis prevents hyperactivity and hypoactivity. Age-related hyperactivity suggests homeostasis may be dysregulated in later life. However, plasticity mechanisms preventing age-related hyperactivity and their efficacy in later life are unclear. We identify the adult cortical plasticity response to elevated activity driven by sensory overstimulation, then test how plasticity changes with age. We use in vivo two-photon imaging of calcium-mediated cellular/synaptic activity, electrophysiology and c-Fos-activity tagging to show control of neuronal activity is dysregulated in the visual cortex in late adulthood. Specifically, in young adult cortex, mGluR5-dependent population-wide excitatory synaptic weakening and inhibitory synaptogenesis reduce cortical activity following overstimulation. In later life, these mechanisms are downregulated, so that overstimulation results in synaptic strengthening and elevated activity. We also find overstimulation disrupts cognition in older but not younger animals. We propose that specific plasticity mechanisms fail in later life dysregulating neuronal microcircuit homeostasis and that the age-related response to overstimulation can impact cognitive performance.
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Affiliation(s)
- Carola I Radulescu
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Nazanin Doostdar
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Nawal Zabouri
- Department of Biomedical Engineering, Imperial College London, South Kensington Campus, London, UK
| | - Leire Melgosa-Ecenarro
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Xingjian Wang
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Sadra Sadeh
- Department of Biomedical Engineering, Imperial College London, South Kensington Campus, London, UK
- Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Pavlina Pavlidi
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK
- Department of Pharmacology, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Joe Airey
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK
| | | | - Claudia Clopath
- Department of Biomedical Engineering, Imperial College London, South Kensington Campus, London, UK
| | - Samuel J Barnes
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK.
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2
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Ferrari Bardile C, Radulescu CI, Pouladi MA. Oligodendrocyte pathology in Huntington's disease: from mechanisms to therapeutics. Trends Mol Med 2023; 29:802-816. [PMID: 37591764 DOI: 10.1016/j.molmed.2023.07.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 07/18/2023] [Accepted: 07/20/2023] [Indexed: 08/19/2023]
Abstract
Oligodendrocytes (OLGs), highly specialized glial cells that wrap axons with myelin sheaths, are critical for brain development and function. There is new recognition of the role of OLGs in the pathogenesis of neurodegenerative diseases (NDDs), including Huntington's disease (HD), a prototypic NDD caused by a polyglutamine tract expansion in huntingtin (HTT), which results in gain- and loss-of-function effects. Clinically, HD is characterized by a constellation of motor, cognitive, and psychiatric disturbances. White matter (WM) structures, representing myelin-rich regions of the brain, are profoundly affected in HD, and recent findings reveal oligodendroglia dysfunction as an early pathological event. Here, we focus on mechanisms that underlie oligodendroglial deficits and dysmyelination in the progression of the disease, highlighting the pathogenic contributions of mutant HTT (mHTT). We also discuss potential therapeutic implications involving these molecular pathways.
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Affiliation(s)
- Costanza Ferrari Bardile
- Department of Medical Genetics, Centre for Molecular Medicine and Therapeutics, Djavad Mowafaghian Centre for Brain Health, British Columbia Children's Hospital Research Institute, University of British Columbia, Vancouver, BC V5Z 4H4, Canada
| | - Carola I Radulescu
- UK Dementia Research Institute, Imperial College London, London, W12 0NN, UK
| | - Mahmoud A Pouladi
- Department of Medical Genetics, Centre for Molecular Medicine and Therapeutics, Djavad Mowafaghian Centre for Brain Health, British Columbia Children's Hospital Research Institute, University of British Columbia, Vancouver, BC V5Z 4H4, Canada.
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3
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Nutma E, Fancy N, Weinert M, Tsartsalis S, Marzin MC, Muirhead RCJ, Falk I, Breur M, de Bruin J, Hollaus D, Pieterman R, Anink J, Story D, Chandran S, Tang J, Trolese MC, Saito T, Saido TC, Wiltshire KH, Beltran-Lobo P, Phillips A, Antel J, Healy L, Dorion MF, Galloway DA, Benoit RY, Amossé Q, Ceyzériat K, Badina AM, Kövari E, Bendotti C, Aronica E, Radulescu CI, Wong JH, Barron AM, Smith AM, Barnes SJ, Hampton DW, van der Valk P, Jacobson S, Howell OW, Baker D, Kipp M, Kaddatz H, Tournier BB, Millet P, Matthews PM, Moore CS, Amor S, Owen DR. Translocator protein is a marker of activated microglia in rodent models but not human neurodegenerative diseases. Nat Commun 2023; 14:5247. [PMID: 37640701 PMCID: PMC10462763 DOI: 10.1038/s41467-023-40937-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Accepted: 08/16/2023] [Indexed: 08/31/2023] Open
Abstract
Microglial activation plays central roles in neuroinflammatory and neurodegenerative diseases. Positron emission tomography (PET) targeting 18 kDa Translocator Protein (TSPO) is widely used for localising inflammation in vivo, but its quantitative interpretation remains uncertain. We show that TSPO expression increases in activated microglia in mouse brain disease models but does not change in a non-human primate disease model or in common neurodegenerative and neuroinflammatory human diseases. We describe genetic divergence in the TSPO gene promoter, consistent with the hypothesis that the increase in TSPO expression in activated myeloid cells depends on the transcription factor AP1 and is unique to a subset of rodent species within the Muroidea superfamily. Finally, we identify LCP2 and TFEC as potential markers of microglial activation in humans. These data emphasise that TSPO expression in human myeloid cells is related to different phenomena than in mice, and that TSPO-PET signals in humans reflect the density of inflammatory cells rather than activation state.
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Affiliation(s)
- Erik Nutma
- Department of Pathology, Amsterdam UMC - Location VUmc, Amsterdam, The Netherlands
- Department of Neurobiology and Aging, Biomedical Primate Research Centre, Rijswijk, The Netherlands
| | - Nurun Fancy
- Department of Brain Sciences, Imperial College London, London, UK
- UK Dementia Research Institute at Imperial College London, London, UK
| | - Maria Weinert
- Department of Brain Sciences, Imperial College London, London, UK
| | - Stergios Tsartsalis
- Department of Brain Sciences, Imperial College London, London, UK
- UK Dementia Research Institute at Imperial College London, London, UK
- Department of Psychiatry, University of Geneva, Geneva, Switzerland
| | - Manuel C Marzin
- Department of Pathology, Amsterdam UMC - Location VUmc, Amsterdam, The Netherlands
| | - Robert C J Muirhead
- Department of Brain Sciences, Imperial College London, London, UK
- UK Dementia Research Institute at Imperial College London, London, UK
| | - Irene Falk
- Viral Immunology Section, NIH, Bethesda, MD, USA
- Flow and Imaging Cytometry Core Facility, NIH, Bethesda, MD, USA
| | - Marjolein Breur
- Department of Pathology, Amsterdam UMC - Location VUmc, Amsterdam, The Netherlands
| | - Joy de Bruin
- Department of Pathology, Amsterdam UMC - Location VUmc, Amsterdam, The Netherlands
| | - David Hollaus
- Department of Pathology, Amsterdam UMC - Location VUmc, Amsterdam, The Netherlands
| | - Robin Pieterman
- Department of Pathology, Amsterdam UMC - Location VUmc, Amsterdam, The Netherlands
| | - Jasper Anink
- Department of (Neuro)Pathology, Amsterdam UMC, University of Amsterdam, Amsterdam Neuroscience, Amsterdam, The Netherlands
| | - David Story
- UK Dementia Research Institute at Edinburgh, Edinburgh, UK
| | | | - Jiabin Tang
- Department of Brain Sciences, Imperial College London, London, UK
- UK Dementia Research Institute at Imperial College London, London, UK
| | - Maria C Trolese
- Department of Neuroscience, Mario Negri Institute for Pharmacological Research IRCCS, Milan, Italy
| | - Takashi Saito
- Laboratory for Proteolytic Neuroscience, RIKEN Brain Science Institute, Wako-shi, Saitama, Japan
| | - Takaomi C Saido
- Department of Neurocognitive Science, Institute of Brain Science, Nagoya City University, Nagoya, Japan
| | | | - Paula Beltran-Lobo
- Department of Basic and Clinical Neuroscience, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Alexandra Phillips
- Department of Brain Sciences, Imperial College London, London, UK
- UK Dementia Research Institute at Imperial College London, London, UK
| | - Jack Antel
- Montreal Neurological Institute, McGill University, Montreal, Canada
| | - Luke Healy
- Montreal Neurological Institute, McGill University, Montreal, Canada
| | - Marie-France Dorion
- Division of Biomedical Sciences, Memorial University of Newfoundland, St. John's, Canada
| | - Dylan A Galloway
- Division of Biomedical Sciences, Memorial University of Newfoundland, St. John's, Canada
| | - Rochelle Y Benoit
- Division of Biomedical Sciences, Memorial University of Newfoundland, St. John's, Canada
| | - Quentin Amossé
- Department of Psychiatry, University of Geneva, Geneva, Switzerland
| | - Kelly Ceyzériat
- Department of Psychiatry, University of Geneva, Geneva, Switzerland
| | | | - Enikö Kövari
- Department of Psychiatry, University of Geneva, Geneva, Switzerland
| | - Caterina Bendotti
- Department of Neuroscience, Mario Negri Institute for Pharmacological Research IRCCS, Milan, Italy
| | - Eleonora Aronica
- Department of (Neuro)Pathology, Amsterdam UMC, University of Amsterdam, Amsterdam Neuroscience, Amsterdam, The Netherlands
| | - Carola I Radulescu
- Department of Brain Sciences, Imperial College London, London, UK
- UK Dementia Research Institute at Imperial College London, London, UK
| | - Jia Hui Wong
- Neurobiology of Aging and Disease Laboratory, Lee Kong Chian School of Medicine, Nanyang Technological University Singapore, Singapore, Singapore
| | - Anna M Barron
- Neurobiology of Aging and Disease Laboratory, Lee Kong Chian School of Medicine, Nanyang Technological University Singapore, Singapore, Singapore
| | - Amy M Smith
- UK Dementia Research Institute at Imperial College London, London, UK
- Centre for Brain Research and Department of Pharmacology and Clinical Pharmacology, University of Auckland, Auckland, New Zealand
| | - Samuel J Barnes
- Department of Brain Sciences, Imperial College London, London, UK
- UK Dementia Research Institute at Imperial College London, London, UK
| | | | - Paul van der Valk
- Department of Pathology, Amsterdam UMC - Location VUmc, Amsterdam, The Netherlands
| | | | - Owain W Howell
- Institute of Life Science (ILS), Swansea University Medical School, Swansea, UK
| | - David Baker
- Department of Neuroscience and Trauma, Blizard Institute, Queen Mary University of London, London, UK
| | - Markus Kipp
- Institute of Anatomy, Rostock University Medical Center, 18057, Rostock, Germany
| | - Hannes Kaddatz
- Institute of Anatomy, Rostock University Medical Center, 18057, Rostock, Germany
| | | | - Philippe Millet
- Department of Psychiatry, University of Geneva, Geneva, Switzerland
- Division of Adult Psychiatry, University Hospitals of Geneva, Geneva, Switzerland
| | - Paul M Matthews
- Department of Brain Sciences, Imperial College London, London, UK
- UK Dementia Research Institute at Imperial College London, London, UK
| | - Craig S Moore
- Division of Biomedical Sciences, Memorial University of Newfoundland, St. John's, Canada
| | - Sandra Amor
- Department of Pathology, Amsterdam UMC - Location VUmc, Amsterdam, The Netherlands.
- Department of Neuroscience and Trauma, Blizard Institute, Queen Mary University of London, London, UK.
- Institute of Anatomy, Rostock University Medical Center, 18057, Rostock, Germany.
| | - David R Owen
- Department of Brain Sciences, Imperial College London, London, UK.
- UK Dementia Research Institute at Imperial College London, London, UK.
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4
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Melgosa-Ecenarro L, Doostdar N, Radulescu CI, Jackson JS, Barnes SJ. Pinpointing the locus of GABAergic vulnerability in Alzheimer's disease. Semin Cell Dev Biol 2023; 139:35-54. [PMID: 35963663 DOI: 10.1016/j.semcdb.2022.06.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 06/30/2022] [Accepted: 06/30/2022] [Indexed: 12/31/2022]
Abstract
The early stages of Alzheimer's disease (AD) have been linked to microcircuit dysfunction and pathophysiological neuronal firing in several brain regions. Inhibitory GABAergic microcircuitry is a critical feature of stable neural-circuit function in the healthy brain, and its dysregulation has therefore been proposed as contributing to AD-related pathophysiology. However, exactly how the critical balance between excitatory and inhibitory microcircuitry is modified by AD pathogenesis remains unclear. Here, we set the current evidence implicating dysfunctional GABAergic microcircuitry as a driver of early AD pathophysiology in a simple conceptual framework. Our framework is based on a generalised reductionist model of firing-rate control by local feedback inhibition. We use this framework to consider multiple loci that may be vulnerable to disruption by AD pathogenesis. We first start with evidence investigating how AD-related processes may impact the gross number of inhibitory neurons in the network. We then move to discuss how pathology may impact intrinsic cellular properties and firing thresholds of GABAergic neurons. Finally, we cover how AD-related pathogenesis may disrupt synaptic connectivity between excitatory and inhibitory neurons. We use the feedback inhibition framework to discuss and organise the available evidence from both preclinical rodent work and human studies in AD patients and conclude by identifying key questions and understudied areas for future investigation.
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Affiliation(s)
- Leire Melgosa-Ecenarro
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK
| | - Nazanin Doostdar
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK
| | - Carola I Radulescu
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK
| | - Johanna S Jackson
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK
| | - Samuel J Barnes
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK.
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5
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Ziaei A, Garcia-Miralles M, Radulescu CI, Sidik H, Silvin A, Bae HG, Bonnard C, Yusof NABM, Ferrari Bardile C, Tan LJ, Ng AYJ, Tohari S, Dehghani L, Henry L, Yeo XY, Lee S, Venkatesh B, Langley SR, Shaygannejad V, Reversade B, Jung S, Ginhoux F, Pouladi MA. Ermin deficiency leads to compromised myelin, inflammatory milieu, and susceptibility to demyelinating insult. Brain Pathol 2022; 32:e13064. [PMID: 35285112 PMCID: PMC9425013 DOI: 10.1111/bpa.13064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 01/09/2022] [Accepted: 02/10/2022] [Indexed: 11/28/2022] Open
Abstract
Ermin is an actin-binding protein found almost exclusively in the central nervous system (CNS) as a component of myelin sheaths. Although Ermin has been predicted to play a role in the formation and stability of myelin sheaths, this has not been directly examined in vivo. Here, we show that Ermin is essential for myelin sheath integrity and normal saltatory conduction. Loss of Ermin in mice caused de-compacted and fragmented myelin sheaths and led to slower conduction along with progressive neurological deficits. RNA sequencing of the corpus callosum, the largest white matter structure in the CNS, pointed to inflammatory activation in aged Ermin-deficient mice, which was corroborated by increased levels of microgliosis and astrogliosis. The inflammatory milieu and myelin abnormalities were further associated with increased susceptibility to immune-mediated demyelination insult in Ermin knockout mice. Supporting a possible role of Ermin deficiency in inflammatory white matter disorders, a rare inactivating mutation in the ERMN gene was identified in multiple sclerosis patients. Our findings demonstrate a critical role for Ermin in maintaining myelin integrity. Given its near-exclusive expression in myelinating oligodendrocytes, Ermin deficiency represents a compelling "inside-out" model of inflammatory dysmyelination and may offer a new paradigm for the development of myelin stability-targeted therapies.
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Affiliation(s)
- Amin Ziaei
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology, and Research (A*STAR), Singapore, Singapore.,UCSF Weill Institute for Neurosciences, University of California, San Francisco, San Francisco, California, USA
| | - Marta Garcia-Miralles
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology, and Research (A*STAR), Singapore, Singapore
| | - Carola I Radulescu
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology, and Research (A*STAR), Singapore, Singapore
| | - Harwin Sidik
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology, and Research (A*STAR), Singapore, Singapore
| | - Aymeric Silvin
- Singapore Immunology Network (SIgN), A*STAR, Singapore, Singapore
| | - Han-Gyu Bae
- Institute of Molecular and Cell Biology, A*STAR, Biopolis, Singapore, Singapore.,Department of Life Sciences, Yeungnam University, Gyeongsan, South Korea
| | - Carine Bonnard
- Institute of Medical Biology, A*STAR, Singapore, Singapore
| | - Nur Amirah Binte Mohammad Yusof
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology, and Research (A*STAR), Singapore, Singapore
| | - Costanza Ferrari Bardile
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology, and Research (A*STAR), Singapore, Singapore.,Department of Medical Genetics, British Columbia Children's Hospital Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Liang Juin Tan
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology, and Research (A*STAR), Singapore, Singapore
| | - Alvin Yu Jin Ng
- Institute of Molecular and Cell Biology, A*STAR, Biopolis, Singapore, Singapore
| | - Sumanty Tohari
- Institute of Molecular and Cell Biology, A*STAR, Biopolis, Singapore, Singapore
| | - Leila Dehghani
- Department of Neurology, Isfahan Neurosciences Research Centre, Faculty of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Lily Henry
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology, and Research (A*STAR), Singapore, Singapore
| | - Xin Yi Yeo
- Institute of Molecular and Cell Biology, A*STAR, Biopolis, Singapore, Singapore
| | - Sejin Lee
- Institute of Molecular and Cell Biology, A*STAR, Biopolis, Singapore, Singapore
| | - Byrappa Venkatesh
- Institute of Molecular and Cell Biology, A*STAR, Biopolis, Singapore, Singapore.,Department of Pediatrics, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Sarah R Langley
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Vahid Shaygannejad
- Department of Neurology, Isfahan Neurosciences Research Centre, Faculty of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | | | - Sangyong Jung
- Institute of Molecular and Cell Biology, A*STAR, Biopolis, Singapore, Singapore.,Department of Physiology, National University of Singapore, Singapore, Singapore
| | - Florent Ginhoux
- Singapore Immunology Network (SIgN), A*STAR, Singapore, Singapore.,Shanghai Institute of Immunology, Shanghai JiaoTong University School of Medicine, Shanghai, China.,Translational Immunology Institute, SingHealth Duke-NUS Academic Medical Centre, Singapore, Singapore
| | - Mahmoud A Pouladi
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology, and Research (A*STAR), Singapore, Singapore.,Department of Medical Genetics, British Columbia Children's Hospital Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
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6
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Abstract
A new study explores the neural-circuit and synaptic processes that support the transition from general to specific aversive memory formation. A critical role for homeostatic synaptic down-scaling in shaping the specificity of an associative memory is identified.
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Affiliation(s)
- Carola I Radulescu
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK
| | - Samuel J Barnes
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK.
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7
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Doostdar N, Airey J, Radulescu CI, Melgosa-Ecenarro L, Zabouri N, Pavlidi P, Kopanitsa M, Saito T, Saido T, Barnes SJ. Multi-scale network imaging in a mouse model of amyloidosis. Cell Calcium 2021; 95:102365. [PMID: 33610083 DOI: 10.1016/j.ceca.2021.102365] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 01/22/2021] [Accepted: 01/24/2021] [Indexed: 02/06/2023]
Abstract
The adult neocortex is not hard-wired but instead retains the capacity to reorganise across multiple spatial scales long into adulthood. Plastic reorganisation occurs at the level of mesoscopic sensory maps, functional neuronal assemblies and synaptic ensembles and is thought to be a critical feature of neuronal network function. Here, we describe a series of approaches that use calcium imaging to measure network reorganisation across multiple spatial scales in vivo. At the mesoscopic level, we demonstrate that sensory activity can be measured in animals undergoing longitudinal behavioural assessment involving automated touchscreen tasks. At the cellular level, we show that network dynamics can be longitudinally measured at both stable and transient functional assemblies. At the level of single synapses, we show that functional subcellular calcium imaging approaches can be used to measure synaptic ensembles of dendritic spines in vivo. Finally, we demonstrate that all three levels of imaging can be spatially related to local pathology in a preclinical rodent model of amyloidosis. We propose that multi-scale in vivo calcium imaging can be used to measure parallel plasticity processes operating across multiple spatial scales in both the healthy brain and preclinical models of disease.
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Affiliation(s)
- Nazanin Doostdar
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London, W12 0NN, United Kingdom
| | - Joseph Airey
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London, W12 0NN, United Kingdom
| | - Carola I Radulescu
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London, W12 0NN, United Kingdom
| | - Leire Melgosa-Ecenarro
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London, W12 0NN, United Kingdom
| | - Nawal Zabouri
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London, W12 0NN, United Kingdom
| | - Pavlina Pavlidi
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London, W12 0NN, United Kingdom
| | - Maksym Kopanitsa
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London, W12 0NN, United Kingdom
| | - Takashi Saito
- Department of Neurocognitive Science, Institute of Brain Science, Nagoya City University Graduate School of Medical Sciences, Aichi, 467-8601, Japan
| | - Takaomi Saido
- Laboratory for Proteolytic Neuroscience, RIKEN Centre for Brain Science, Wako-shi, Saitama, 351-0198, Japan
| | - Samuel J Barnes
- UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London, W12 0NN, United Kingdom.
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8
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Utami KH, Skotte NH, Colaço AR, Yusof NABM, Sim B, Yeo XY, Bae HG, Garcia-Miralles M, Radulescu CI, Chen Q, Chaldaiopoulou G, Liany H, Nama S, Peteri UKA, Sampath P, Castrén ML, Jung S, Mann M, Pouladi MA. Integrative Analysis Identifies Key Molecular Signatures Underlying Neurodevelopmental Deficits in Fragile X Syndrome. Biol Psychiatry 2020; 88:500-511. [PMID: 32653109 DOI: 10.1016/j.biopsych.2020.05.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 03/26/2020] [Accepted: 05/02/2020] [Indexed: 12/23/2022]
Abstract
BACKGROUND Fragile X syndrome (FXS) is a neurodevelopmental disorder caused by epigenetic silencing of FMR1 and loss of FMRP expression. Efforts to understand the molecular underpinnings of the disease have been largely performed in rodent or nonisogenic settings. A detailed examination of the impact of FMRP loss on cellular processes and neuronal properties in the context of isogenic human neurons remains lacking. METHODS Using CRISPR (clustered regularly interspaced short palindromic repeats)/Cas9 to introduce indels in exon 3 of FMR1, we generated an isogenic human pluripotent stem cell model of FXS that shows complete loss of FMRP expression. We generated neuronal cultures and performed genome-wide transcriptome and proteome profiling followed by functional validation of key dysregulated processes. We further analyzed neurodevelopmental and neuronal properties, including neurite length and neuronal activity, using multielectrode arrays and patch clamp electrophysiology. RESULTS We showed that the transcriptome and proteome profiles of isogenic FMRP-deficient neurons demonstrate perturbations in synaptic transmission, neuron differentiation, cell proliferation and ion transmembrane transporter activity pathways, and autism spectrum disorder-associated gene sets. We uncovered key deficits in FMRP-deficient cells demonstrating abnormal neural rosette formation and neural progenitor cell proliferation. We further showed that FMRP-deficient neurons exhibit a number of additional phenotypic abnormalities, including neurite outgrowth and branching deficits and impaired electrophysiological network activity. These FMRP-deficient related impairments have also been validated in additional FXS patient-derived human-induced pluripotent stem cell neural cells. CONCLUSIONS Using isogenic human pluripotent stem cells as a model to investigate the pathophysiology of FXS in human neurons, we reveal key neural abnormalities arising from the loss of FMRP.
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Affiliation(s)
- Kagistia Hana Utami
- Translational Laboratory in Genetic Medicine, Agency for Science, Technology and Research, Singapore (A∗STAR), Singapore
| | - Niels H Skotte
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, Copenhagen N, Denmark
| | - Ana R Colaço
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, Copenhagen N, Denmark
| | | | - Bernice Sim
- Translational Laboratory in Genetic Medicine, Agency for Science, Technology and Research, Singapore (A∗STAR), Singapore
| | - Xin Yi Yeo
- Singapore Bioimaging Consortium, Agency for Science, Technology and Research, Singapore (A∗STAR), Singapore; Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Han-Gyu Bae
- Singapore Bioimaging Consortium, Agency for Science, Technology and Research, Singapore (A∗STAR), Singapore
| | - Marta Garcia-Miralles
- Translational Laboratory in Genetic Medicine, Agency for Science, Technology and Research, Singapore (A∗STAR), Singapore
| | - Carola I Radulescu
- Translational Laboratory in Genetic Medicine, Agency for Science, Technology and Research, Singapore (A∗STAR), Singapore; UK Dementia Research Institute, Department of Brain Sciences, Imperial College London, London, United Kingdom
| | - Qiyu Chen
- Translational Laboratory in Genetic Medicine, Agency for Science, Technology and Research, Singapore (A∗STAR), Singapore
| | - Georgia Chaldaiopoulou
- Translational Laboratory in Genetic Medicine, Agency for Science, Technology and Research, Singapore (A∗STAR), Singapore
| | - Herty Liany
- Genome Institute of Singapore, Agency for Science, Technology and Research, Singapore (A∗STAR), Singapore
| | - Srikanth Nama
- Institute of Medical Biology, Agency for Science, Technology and Research, Singapore (A∗STAR), Singapore
| | - Ulla-Kaisa A Peteri
- Department of Physiology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Prabha Sampath
- Institute of Medical Biology, Agency for Science, Technology and Research, Singapore (A∗STAR), Singapore
| | - Maija L Castrén
- Department of Physiology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Sangyong Jung
- Singapore Bioimaging Consortium, Agency for Science, Technology and Research, Singapore (A∗STAR), Singapore; Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Matthias Mann
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, Copenhagen N, Denmark
| | - Mahmoud A Pouladi
- Translational Laboratory in Genetic Medicine, Agency for Science, Technology and Research, Singapore (A∗STAR), Singapore; Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
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9
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Radulescu CI, Garcia-Miralles M, Sidik H, Bardile CF, Yusof NABM, Lee HU, Ho EXP, Chu CW, Layton E, Low D, De Sessions PF, Pettersson S, Ginhoux F, Pouladi MA. Reprint of: Manipulation of microbiota reveals altered callosal myelination and white matter plasticity in a model of Huntington disease. Neurobiol Dis 2020; 135:104744. [PMID: 31931139 DOI: 10.1016/j.nbd.2020.104744] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 02/02/2019] [Accepted: 02/20/2019] [Indexed: 12/19/2022] Open
Abstract
Structural and molecular myelination deficits represent early pathological features of Huntington disease (HD). Recent evidence from germ-free (GF) animals suggests a role for microbiota-gut-brain bidirectional communication in the regulation of myelination. In this study, we aimed to investigate the impact of microbiota on myelin plasticity and oligodendroglial population dynamics in the mixed-sex BACHD mouse model of HD. Ultrastructural analysis of myelin in the corpus callosum revealed alterations of myelin thickness in BACHD GF compared to specific-pathogen free (SPF) mice, whereas no differences were observed between wild-type (WT) groups. In contrast, myelin compaction was altered in all groups when compared to WT SPF animals. Levels of myelin-related proteins were generally reduced, and the number of mature oligodendrocytes was decreased in the prefrontal cortex under GF compared to SPF conditions, regardless of genotype. Minor differences in commensal bacteria at the family and genera levels were found in the gut microbiota of BACHD and WT animals housed in standard living conditions. Our findings indicate complex effects of a germ-free status on myelin-related characteristics, and highlight the adaptive properties of myelination as a result of environmental manipulation.
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Affiliation(s)
- Carola I Radulescu
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology and Research (A*STAR), 138648, Singapore; Department of Psychology, The University of Sheffield, S1 2LT, UK
| | - Marta Garcia-Miralles
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology and Research (A*STAR), 138648, Singapore
| | - Harwin Sidik
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology and Research (A*STAR), 138648, Singapore
| | - Costanza Ferrari Bardile
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology and Research (A*STAR), 138648, Singapore
| | - Nur Amirah Binte Mohammad Yusof
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology and Research (A*STAR), 138648, Singapore
| | - Hae Ung Lee
- Lee Kong Chian School of Medicine, Nanyang Technological University, 637551, Singapore
| | - Eliza Xin Pei Ho
- GIS Efficient Rapid Microbial Sequencing, Genome Institute of Singapore, A*STAR, 138672, Singapore
| | - Collins Wenhan Chu
- GIS Efficient Rapid Microbial Sequencing, Genome Institute of Singapore, A*STAR, 138672, Singapore
| | - Emma Layton
- GIS Efficient Rapid Microbial Sequencing, Genome Institute of Singapore, A*STAR, 138672, Singapore
| | - Donovan Low
- Singapore Immunology Network, A*STAR, 138648, Singapore
| | - Paola Florez De Sessions
- GIS Efficient Rapid Microbial Sequencing, Genome Institute of Singapore, A*STAR, 138672, Singapore
| | - Sven Pettersson
- Lee Kong Chian School of Medicine, Nanyang Technological University, 637551, Singapore; Singapore Centre for Environmental Life Sciences Engineering, 60 Nanyang Drive, 637551, Singapore
| | | | - Mahmoud A Pouladi
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology and Research (A*STAR), 138648, Singapore; Department of Medicine, National University of Singapore, 117597, Singapore; Department of Physiology, National University of Singapore, 117597, Singapore.
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10
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Radulescu CI, Garcia-Miralles M, Sidik H, Bardile CF, Yusof NABM, Lee HU, Ho EXP, Chu CW, Layton E, Low D, De Sessions PF, Pettersson S, Ginhoux F, Pouladi MA. Manipulation of microbiota reveals altered callosal myelination and white matter plasticity in a model of Huntington disease. Neurobiol Dis 2019; 127:65-75. [DOI: 10.1016/j.nbd.2019.02.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 02/02/2019] [Accepted: 02/20/2019] [Indexed: 01/08/2023] Open
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11
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Xu X, Radulescu CI, Utami KH, Pouladi MA. Obtaining Multi-electrode Array Recordings from Human Induced Pluripotent Stem Cell-Derived Neurons. Bio Protoc 2017; 7:e2609. [PMID: 34595282 DOI: 10.21769/bioprotoc.2609] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Revised: 10/16/2017] [Accepted: 10/27/2017] [Indexed: 11/02/2022] Open
Abstract
Neuronal electrical properties are often aberrant in neurological disorders. Human induced pluripotent stem cells (hiPSCs)-derived neurons represent a useful platform for neurological disease modeling, drug discovery and toxicity screening in vitro. Multi-electrode array (MEA) systems offer a non-invasive and label-free platform to record neuronal evoked-responses concurrently from multiple electrodes. To better detect the neural network changes, we used the Axion Maestro MEA platform to assess neuronal activity and bursting behaviors in hiPSC-derived neuronal cultures. Here we describe the detailed protocol for neuronal culture preparation, MEA recording, and data analysis, which we hope will benefit other researchers in the field.
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Affiliation(s)
- Xiaohong Xu
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology and Research (ASTAR), Singapore, Singapore
| | - Carola I Radulescu
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology and Research (ASTAR), Singapore, Singapore
| | - Kagistia Hana Utami
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology and Research (ASTAR), Singapore, Singapore
| | - Mahmoud A Pouladi
- Translational Laboratory in Genetic Medicine (TLGM), Agency for Science, Technology and Research (ASTAR), Singapore, Singapore.,Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
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