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Wang J, Li M, Zhang J, Gao Q, Ding Z, Sun J. Paliperidone alleviates MK-801-induced damage to prefrontal cortical neurons via the PP2A/PTEN pathway. J Affect Disord 2022; 317:265-277. [PMID: 36031001 DOI: 10.1016/j.jad.2022.08.071] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 08/12/2022] [Accepted: 08/22/2022] [Indexed: 11/19/2022]
Abstract
BACKGROUND The putative mechanisms underlying the efficacy of the US Food and Drug Administration-approved antipsychotic drug paliperidone for the treatment of schizophrenia deserve additional investigation, which is the aim of the present animal study. METHODS The behavioral activities of mice were recorded in the open field test and light-dark box test. The effects of paliperidone on MK-801-induced neuronal damage in the prefrontal cortex were tested by flow cytometry, TUNEL staining assays, and ROS staining assays. The neuroprotective effects of paliperidone on neural dendrites and synapses were evaluated using Golgi staining and Sholl analysis. An adenovirus vector containing a Ca2+ indicator was used to monitor the calcium ion concentration in the prefrontal cortex. The expression levels of protein phosphatase 2A (PP2A) and phosphatase and tensin homolog (PTEN) were investigated using Western blotting. RESULTS The data showed that MK-801 caused stereotyped behavior in mice and induced synaptic damage and dendritic spine impairment compared with the control, whereas paliperidone ameliorated these changes. Moreover, paliperidone reversed MK-801-induced decreases in PP2A and PTEN levels in prefrontal cortical neurons. Furthermore, in primary cultured cortical neurons and HT-22 cells, paliperidone inhibited cell apoptosis caused by MK-801. In particular, pretreatment with the PP2A inhibitor LB-100 significantly restrained the protective effects of paliperidone on MK-801-treated neurons and on locomotor activity and stereotypical behavior of mice. LIMITATIONS Whether other proteins are involved in this pathway and how the pathway works have not been revealed. CONCLUSION Our data show that paliperidone alleviates neuronal damage induced by MK-801 via the PP2A/PTEN pathway.
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Affiliation(s)
- Jiaxu Wang
- Department of Anatomy and Neurobiology, School of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Meng Li
- Department of Anatomy and Neurobiology, School of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Jing Zhang
- Department of Anatomy and Neurobiology, School of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Qing Gao
- Department of Anatomy and Neurobiology, School of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Zhaoxi Ding
- Department of Anatomy and Neurobiology, School of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Jinhao Sun
- Department of Anatomy and Neurobiology, School of Medicine, Shandong University, Jinan, Shandong 250012, China.
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Goyal R, Spencer KA, Borodinsky LN. From Neural Tube Formation Through the Differentiation of Spinal Cord Neurons: Ion Channels in Action During Neural Development. Front Mol Neurosci 2020; 13:62. [PMID: 32390800 PMCID: PMC7193536 DOI: 10.3389/fnmol.2020.00062] [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: 02/17/2020] [Accepted: 04/01/2020] [Indexed: 12/15/2022] Open
Abstract
Ion channels are expressed throughout nervous system development. The type and diversity of conductances and gating mechanisms vary at different developmental stages and with the progressive maturational status of neural cells. The variety of ion channels allows for distinct signaling mechanisms in developing neural cells that in turn regulate the needed cellular processes taking place during each developmental period. These include neural cell proliferation and neuronal differentiation, which are crucial for developmental events ranging from the earliest steps of morphogenesis of the neural tube through the establishment of neuronal circuits. Here, we compile studies assessing the ontogeny of ionic currents in the developing nervous system. We then review work demonstrating a role for ion channels in neural tube formation, to underscore the necessity of the signaling downstream ion channels even at the earliest stages of neural development. We discuss the function of ion channels in neural cell proliferation and neuronal differentiation and conclude with how the regulation of all these morphogenetic and cellular processes by electrical activity enables the appropriate development of the nervous system and the establishment of functional circuits adapted to respond to a changing environment.
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Affiliation(s)
- Raman Goyal
- Department of Physiology & Membrane Biology and Institute for Pediatric Regenerative Medicine, Shriners Hospital for Children, University of California Davis School of Medicine, Sacramento, CA, United States
| | - Kira A Spencer
- Department of Physiology & Membrane Biology and Institute for Pediatric Regenerative Medicine, Shriners Hospital for Children, University of California Davis School of Medicine, Sacramento, CA, United States
| | - Laura N Borodinsky
- Department of Physiology & Membrane Biology and Institute for Pediatric Regenerative Medicine, Shriners Hospital for Children, University of California Davis School of Medicine, Sacramento, CA, United States
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3
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Lee YI. Developmental neuromuscular synapse elimination: Activity-dependence and potential downstream effector mechanisms. Neurosci Lett 2019; 718:134724. [PMID: 31877335 DOI: 10.1016/j.neulet.2019.134724] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 12/18/2019] [Accepted: 12/23/2019] [Indexed: 12/12/2022]
Abstract
Synaptic connections initially formed during nervous system development undergo a significant transformation during nervous system maturation. Such maturation is essential for the proper architecture and function of the nervous system. Developmental synaptic transformation includes "synapse elimination," a process in which multiple immature presynaptic inputs converge at and compete for control of a common postsynaptic target. This developmental synaptic remodeling is best understood at mammalian neuromuscular junctions. It is well established that neuromuscular activity provides the impetus for the pruning of redundant motor axon inputs. Despite the dominant influence neuromuscular activity exerts on developmental synapse elimination, however, the downstream mechanisms of neuromuscular activity that affect synapse elimination remain poorly understood. Conversely, although several cellular and molecular effector mechanisms are known to impact synapse elimination, it is unclear whether they are modulated by neuromuscular activity. This review discusses how the motor neurons, synaptic glia and muscle fibers each contributes to the developmental phenomenon, and speculates how neuromuscular activity may modulate these contributions.
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Affiliation(s)
- Young Il Lee
- Department of Biology, Texas A&M University, College Station, TX, 77843, USA.
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4
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Darabid H, St-Pierre-See A, Robitaille R. Purinergic-Dependent Glial Regulation of Synaptic Plasticity of Competing Terminals and Synapse Elimination at the Neuromuscular Junction. Cell Rep 2019; 25:2070-2082.e6. [PMID: 30463006 DOI: 10.1016/j.celrep.2018.10.075] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 07/23/2018] [Accepted: 10/19/2018] [Indexed: 01/20/2023] Open
Abstract
The precise wiring of synaptic connections requires the elimination of supernumerary inputs competing for innervation of the same target cell. This competition is activity-dependent, strengthening some inputs whereas others are eliminated. Although glial cells are required for the elimination and clearance of terminals, their involvement in activity-dependent synaptic competition remains ill-defined. Here, we used the developing neuromuscular junctions of mice to show that perisynaptic glial cells, through 2Y1 purinergic receptors (P2Y1Rs), decode synaptic efficacy of competing terminals in a Ca2+-dependent manner. This glial activity induces long-lasting synaptic potentiation of strong but not weak terminals via presynaptic adenosine 2A receptors. Blockade of glial activity by intracellular Ca2+ chelation or blockade of P2Y1Rs prevents this plasticity. In addition, blockade of P2Y1Rs delays synapse elimination in vivo. Hence, P2Y1Rs drive glial cell regulation of strong synaptic inputs and influence synapse competition and elimination.
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Affiliation(s)
- Houssam Darabid
- Département de Neurosciences, Université de Montréal, PO Box 6128, Station Centre-ville, Montréal, QC H3C 3J7, Canada; Groupe de Recherche sur le Système Nerveux Central, Université de Montréal, PO Box 6128, Station Centre-ville, Montréal, QC H3C 3J7, Canada
| | - Alexandre St-Pierre-See
- Département de Neurosciences, Université de Montréal, PO Box 6128, Station Centre-ville, Montréal, QC H3C 3J7, Canada; Groupe de Recherche sur le Système Nerveux Central, Université de Montréal, PO Box 6128, Station Centre-ville, Montréal, QC H3C 3J7, Canada
| | - Richard Robitaille
- Département de Neurosciences, Université de Montréal, PO Box 6128, Station Centre-ville, Montréal, QC H3C 3J7, Canada; Groupe de Recherche sur le Système Nerveux Central, Université de Montréal, PO Box 6128, Station Centre-ville, Montréal, QC H3C 3J7, Canada.
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5
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Dong H, Zhu M, Meng L, Ding Y, Yang D, Zhang S, Qiang W, Fisher DW, Xu EY. Pumilio2 regulates synaptic plasticity via translational repression of synaptic receptors in mice. Oncotarget 2018; 9:32134-32148. [PMID: 30181804 PMCID: PMC6114944 DOI: 10.18632/oncotarget.24345] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Accepted: 01/13/2018] [Indexed: 11/25/2022] Open
Abstract
PUMILIO 2 (PUM2) is a member of Pumilio and FBF (PUF) family, an RNA binding protein family with phylogenetically conserved roles in germ cell development. The Drosophila Pumilio homolog is also required for dendrite morphogenesis and synaptic function via translational control of synaptic proteins, such as glutamate receptors, and recent mammalian studies demonstrated a similar role in neuronal culture with associated motor and memory abnormalities in vivo. Importantly, transgenic mice with PUM2 knockout show prominent epileptiform activity, and patients with intractable temporal lobe epilepsy and mice with pilocarpine-induced seizures have decreased neuronal PUM2, possibly leading to further seizure susceptibility. However, how PUM2 influences synaptic function in vivo and, subsequently, seizures is not known. We found that PUM2 is highly expressed in the brain, especially in the temporal lobe, and knockout of Pum2 (Pum2-/- ) resulted in significantly increased pyramidal cell dendrite spine and synapse density. In addition, multiple proteins associated with excitatory synaptic function, including glutamate receptor 2 (GLUR2), are up-regulated in Pum2-/- mice. The expression of GLUR2 protein but not mRNA is increased in the Pum2-/- mutant hippocampus, Glur2 transcripts are increased in mutant polysome fractions, and overexpression of PUM2 led to repression of reporter expression containing the 3'Untranslated Region (3'UTR) of Glur2, suggesting translation of GLUR2 was increased in the absence of Pum2. Overall, these studies provide a molecular mechanism for the increased temporal lobe excitability observed with PUM2 loss and suggest PUM2 might contribute to intractable temporal lobe epilepsy.
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Affiliation(s)
- Hongxin Dong
- Departments of Psychiatry and Behavioral Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Mengyi Zhu
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, 211166, P. R. China
| | - Liping Meng
- Departments of Psychiatry and Behavioral Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Yan Ding
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, 211166, P. R. China
| | - Ding Yang
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, 211166, P. R. China
| | - Shanshan Zhang
- Departments of Psychiatry and Behavioral Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Wenan Qiang
- Department of Obstetrics and Gynecology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Daniel W Fisher
- Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Eugene Yujun Xu
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, 211166, P. R. China
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Tetruashvily MM, McDonald MA, Boulanger LM, Boulanger LM. MHCI promotes developmental synapse elimination and aging-related synapse loss at the vertebrate neuromuscular junction. Brain Behav Immun 2016; 56:197-208. [PMID: 26802986 PMCID: PMC5813483 DOI: 10.1016/j.bbi.2016.01.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Revised: 01/12/2016] [Accepted: 01/12/2016] [Indexed: 12/23/2022] Open
Abstract
Synapse elimination at the developing neuromuscular junction (NMJ) sculpts motor circuits, and synapse loss at the aging NMJ drives motor impairments that are a major cause of loss of independence in the elderly. Here we provide evidence that at the NMJ, both developmental synapse elimination and aging-related synapse loss are promoted by specific immune proteins, members of the major histocompatibility complex class I (MHCI). MHCI is expressed at the developing NMJ, and three different methods of reducing MHCI function all disrupt synapse elimination during the second postnatal week, leaving some muscle fibers multiply-innervated, despite otherwise outwardly normal synapse formation and maturation. Conversely, overexpressing MHCI modestly accelerates developmental synapse elimination. MHCI levels at the NMJ rise with aging, and reducing MHCI levels ameliorates muscle denervation in aged mice. These findings identify an unexpected role for MHCI in the elimination of neuromuscular synapses during development, and indicate that reducing MHCI levels can preserve youthful innervation of aging muscle.
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Affiliation(s)
- Mazell M. Tetruashvily
- Department of Molecular Biology, Princeton University, Princeton, NJ 08544,Rutgers Robert Wood Johnson Medical School, Piscataway, NJ 08854
| | - Marin A. McDonald
- Department of Neurosciences, University of California, San Diego 92093,Medical Scientist Training Program, University of California, San Diego 92093
| | - Lisa M. Boulanger
- Department of Molecular Biology, Princeton University, Princeton, NJ 08544,Department of Neurosciences, University of California, San Diego 92093,Princeton Neuroscience Institute, Princeton University, Princeton, NJ 08544,Correspondence to:
| | - Lisa M Boulanger
- Department of Molecular Biology, Princeton University, Princeton, NJ 08544, United States; Department of Neurosciences, University of California, San Diego 92093, United States; Princeton Neuroscience Institute, Princeton University, Princeton, NJ 08544, United States.
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7
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Favero M, Cangiano A, Busetto G. Adult rat motor neurons do not re-establish electrical coupling during axonal regeneration and muscle reinnervation. PLoS One 2015; 10:e0123576. [PMID: 25875765 PMCID: PMC4395398 DOI: 10.1371/journal.pone.0123576] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Accepted: 03/04/2015] [Indexed: 11/19/2022] Open
Abstract
Gap junctions (GJs) between neurons are present in both the newborn and the adult nervous system, and although important roles have been suggested or demonstrated in a number of instances, in many other cases a full understanding of their physiological role is still missing. GJs are expressed in the rodent lumbar cord at birth and mediate both dye and electrical coupling between motor neurons. This expression has been proposed to mediate: (i) fast synchronization of motoneuronal spike activity, in turn linked to the process of refinement of neuromuscular connections, and (ii) slow synchronization of locomotor-like oscillatory activity. Soon after birth this coupling disappears. Since in the adult rat regeneration of motor fibers after peripheral nerve injury leads to a recapitulation of synaptic refinement at the target muscles, we tested whether GJs between motor neurons are transiently re-expressed. We found that in conditions of maximal responsiveness of lumbar motor neurons (such as no depression by anesthetics, decerebrate release of activity of subsets of motor neurons, use of temporal and spatial summation by antidromic and orthodromic stimulations, testing of large ensembles of motor neurons) no firing is observed in ventral root axons in response to antidromic spike invasion of nearby counterparts. We conclude that junctional coupling between motor neurons is not required for the refinement of neuromuscular innervation in the adult.
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Affiliation(s)
- Morgana Favero
- Department of Neurological and Movement Sciences, Section of Physiology and Psychology, University of Verona, 37134, Verona, Italy
- National Institute of Neuroscience, 37134, Verona, Italy
| | - Alberto Cangiano
- Department of Neurological and Movement Sciences, Section of Physiology and Psychology, University of Verona, 37134, Verona, Italy
- National Institute of Neuroscience, 37134, Verona, Italy
| | - Giuseppe Busetto
- Department of Neurological and Movement Sciences, Section of Physiology and Psychology, University of Verona, 37134, Verona, Italy
- National Institute of Neuroscience, 37134, Verona, Italy
- * E-mail:
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8
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Li Y, Yan X, Liu J, Li L, Hu X, Sun H, Tian J. Pulsed electromagnetic field enhances brain-derived neurotrophic factor expression through L-type voltage-gated calcium channel- and Erk-dependent signaling pathways in neonatal rat dorsal root ganglion neurons. Neurochem Int 2014; 75:96-104. [PMID: 24937769 DOI: 10.1016/j.neuint.2014.06.004] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2014] [Revised: 05/18/2014] [Accepted: 06/07/2014] [Indexed: 11/30/2022]
Abstract
Although pulsed electromagnetic field (PEMF) exposure has been reported to promote neuronal differentiation, the mechanism is still unclear. Here, we aimed to examine the effects of PEMF exposure on brain-derived neurotrophic factor (Bdnf) mRNA expression and the correlation between the intracellular free calcium concentration ([Ca(2+)]i) and Bdnf mRNA expression in cultured dorsal root ganglion neurons (DRGNs). Exposure to 50Hz and 1mT PEMF for 2h increased the level of [Ca(2+)]i and Bdnf mRNA expression, which was found to be mediated by increased [Ca(2+)]i from Ca(2+) influx through L-type voltage-gated calcium channels (VGCCs). However, calcium mobilization was not involved in the increased [Ca(2+)]i and BDNF expression, indicating that calcium influx was one of the key factors responding to PEMF exposure. Moreover, PD098059, an extracellular signal-regulated kinase (Erk) inhibitor, strongly inhibited PEMF-dependant Erk1/2 activation and BDNF expression, indicating that Erk activation is required for PEMF-induced upregulation of BDNF expression. These findings indicated that PEMF exposure increased BDNF expression in DRGNs by activating Ca(2+)- and Erk-dependent signaling pathways.
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Affiliation(s)
- Yuan Li
- Second Clinical Medical College, Southern Medical University, Guangzhou 510280, PR China
| | - Xiaodong Yan
- Department of Orthopaedics, Tangdu Hospital, Fourth Military Medical University, Xi'an 710038, PR China
| | - Juanfang Liu
- Department of Clinical Aerospace Medicine, Fourth Military Medical University, Xi'an 710032, PR China
| | - Ling Li
- Department of Geriatrics, Shaanxi Provincial TCM Hospital, Xi'an 710032, PR China
| | - Xinghua Hu
- Department of Endocrinology, Shaanxi Provincial TCM Hospital, Xi'an 710032, PR China
| | - Honghui Sun
- Department of Orthopaedics, Tangdu Hospital, Fourth Military Medical University, Xi'an 710038, PR China.
| | - Jing Tian
- Second Clinical Medical College, Southern Medical University, Guangzhou 510280, PR China.
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Electrical Stimulation Induces Calcium-Dependent Neurite Outgrowth and Immediate Early Genes Expressions of Dorsal Root Ganglion Neurons. Neurochem Res 2013; 39:129-41. [DOI: 10.1007/s11064-013-1197-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Revised: 11/03/2013] [Accepted: 11/07/2013] [Indexed: 10/26/2022]
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Borodinsky LN, Belgacem YH, Swapna I. Electrical activity as a developmental regulator in the formation of spinal cord circuits. Curr Opin Neurobiol 2012; 22:624-30. [PMID: 22370142 DOI: 10.1016/j.conb.2012.02.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2012] [Revised: 02/04/2012] [Accepted: 02/06/2012] [Indexed: 10/28/2022]
Abstract
Spinal cord development is a complex process involving generation of the appropriate number of cells, acquisition of distinctive phenotypes and establishment of functional connections that enable execution of critical functions such as sensation and locomotion. Here we review the basic cellular events occurring during spinal cord development, highlighting studies that demonstrate the roles of electrical activity in this process. We conclude that the participation of different forms of electrical activity is evident from the beginning of spinal cord development and intermingles with other developmental cues and programs to implement dynamic and integrated control of spinal cord function.
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Affiliation(s)
- Laura N Borodinsky
- Department of Physiology & Membrane Biology, and Shriners Hospital for Children Northern California, University of California Davis School of Medicine, Sacramento, CA 95819, United States.
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The timing of impulse activity shapes the process of synaptic competition at the neuromuscular junction. Neuroscience 2010; 167:343-53. [DOI: 10.1016/j.neuroscience.2010.01.055] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2009] [Revised: 11/06/2009] [Accepted: 01/26/2010] [Indexed: 11/18/2022]
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