1
|
Karafoulidou E, Kesidou E, Theotokis P, Konstantinou C, Nella MK, Michailidou I, Touloumi O, Polyzoidou E, Salamotas I, Einstein O, Chatzisotiriou A, Boziki MK, Grigoriadis N. Systemic LPS Administration Stimulates the Activation of Non-Neuronal Cells in an Experimental Model of Spinal Muscular Atrophy. Cells 2024; 13:785. [PMID: 38727321 PMCID: PMC11083572 DOI: 10.3390/cells13090785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 04/27/2024] [Accepted: 05/02/2024] [Indexed: 05/13/2024] Open
Abstract
Spinal muscular atrophy (SMA) is a neurodegenerative disease caused by deficiency of the survival motor neuron (SMN) protein. Although SMA is a genetic disease, environmental factors contribute to disease progression. Common pathogen components such as lipopolysaccharides (LPS) are considered significant contributors to inflammation and have been associated with muscle atrophy, which is considered a hallmark of SMA. In this study, we used the SMNΔ7 experimental mouse model of SMA to scrutinize the effect of systemic LPS administration, a strong pro-inflammatory stimulus, on disease outcome. Systemic LPS administration promoted a reduction in SMN expression levels in CNS, peripheral lymphoid organs, and skeletal muscles. Moreover, peripheral tissues were more vulnerable to LPS-induced damage compared to CNS tissues. Furthermore, systemic LPS administration resulted in a profound increase in microglia and astrocytes with reactive phenotypes in the CNS of SMNΔ7 mice. In conclusion, we hereby show for the first time that systemic LPS administration, although it may not precipitate alterations in terms of deficits of motor functions in a mouse model of SMA, it may, however, lead to a reduction in the SMN protein expression levels in the skeletal muscles and the CNS, thus promoting synapse damage and glial cells' reactive phenotype.
Collapse
Affiliation(s)
- Eleni Karafoulidou
- Laboratory of Experimental Neurology and Neuroimmunology, 2nd Neurological University Department, AHEPA General Hospital of Thessaloniki, Faculty of Health Science, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece; (E.K.); (E.K.); (P.T.); (C.K.); (M.-K.N.); (I.M.); (O.T.); (E.P.); (I.S.)
| | - Evangelia Kesidou
- Laboratory of Experimental Neurology and Neuroimmunology, 2nd Neurological University Department, AHEPA General Hospital of Thessaloniki, Faculty of Health Science, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece; (E.K.); (E.K.); (P.T.); (C.K.); (M.-K.N.); (I.M.); (O.T.); (E.P.); (I.S.)
| | - Paschalis Theotokis
- Laboratory of Experimental Neurology and Neuroimmunology, 2nd Neurological University Department, AHEPA General Hospital of Thessaloniki, Faculty of Health Science, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece; (E.K.); (E.K.); (P.T.); (C.K.); (M.-K.N.); (I.M.); (O.T.); (E.P.); (I.S.)
| | - Chrystalla Konstantinou
- Laboratory of Experimental Neurology and Neuroimmunology, 2nd Neurological University Department, AHEPA General Hospital of Thessaloniki, Faculty of Health Science, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece; (E.K.); (E.K.); (P.T.); (C.K.); (M.-K.N.); (I.M.); (O.T.); (E.P.); (I.S.)
| | - Maria-Konstantina Nella
- Laboratory of Experimental Neurology and Neuroimmunology, 2nd Neurological University Department, AHEPA General Hospital of Thessaloniki, Faculty of Health Science, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece; (E.K.); (E.K.); (P.T.); (C.K.); (M.-K.N.); (I.M.); (O.T.); (E.P.); (I.S.)
| | - Iliana Michailidou
- Laboratory of Experimental Neurology and Neuroimmunology, 2nd Neurological University Department, AHEPA General Hospital of Thessaloniki, Faculty of Health Science, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece; (E.K.); (E.K.); (P.T.); (C.K.); (M.-K.N.); (I.M.); (O.T.); (E.P.); (I.S.)
| | - Olga Touloumi
- Laboratory of Experimental Neurology and Neuroimmunology, 2nd Neurological University Department, AHEPA General Hospital of Thessaloniki, Faculty of Health Science, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece; (E.K.); (E.K.); (P.T.); (C.K.); (M.-K.N.); (I.M.); (O.T.); (E.P.); (I.S.)
| | - Eleni Polyzoidou
- Laboratory of Experimental Neurology and Neuroimmunology, 2nd Neurological University Department, AHEPA General Hospital of Thessaloniki, Faculty of Health Science, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece; (E.K.); (E.K.); (P.T.); (C.K.); (M.-K.N.); (I.M.); (O.T.); (E.P.); (I.S.)
| | - Ilias Salamotas
- Laboratory of Experimental Neurology and Neuroimmunology, 2nd Neurological University Department, AHEPA General Hospital of Thessaloniki, Faculty of Health Science, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece; (E.K.); (E.K.); (P.T.); (C.K.); (M.-K.N.); (I.M.); (O.T.); (E.P.); (I.S.)
| | - Ofira Einstein
- Department of Physical Therapy, Faculty of Health Sciences, Ariel University, Ariel 40700, Israel;
| | - Athanasios Chatzisotiriou
- Department of Physiology, Medical School, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece;
| | - Marina-Kleopatra Boziki
- Laboratory of Experimental Neurology and Neuroimmunology, 2nd Neurological University Department, AHEPA General Hospital of Thessaloniki, Faculty of Health Science, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece; (E.K.); (E.K.); (P.T.); (C.K.); (M.-K.N.); (I.M.); (O.T.); (E.P.); (I.S.)
| | - Nikolaos Grigoriadis
- Laboratory of Experimental Neurology and Neuroimmunology, 2nd Neurological University Department, AHEPA General Hospital of Thessaloniki, Faculty of Health Science, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece; (E.K.); (E.K.); (P.T.); (C.K.); (M.-K.N.); (I.M.); (O.T.); (E.P.); (I.S.)
| |
Collapse
|
2
|
Šoštarić P, Matić M, Nemanić D, Lučev Vasić Ž, Cifrek M, Pirazzini M, Matak I. Beyond neuromuscular activity: botulinum toxin type A exerts direct central action on spinal control of movement. Eur J Pharmacol 2024; 962:176242. [PMID: 38048980 DOI: 10.1016/j.ejphar.2023.176242] [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: 09/22/2023] [Revised: 11/15/2023] [Accepted: 11/28/2023] [Indexed: 12/06/2023]
Abstract
Overt muscle activity and impaired spinal locomotor control hampering coordinated movement is a hallmark of spasticity and movement disorders like dystonia. While botulinum toxin A (BoNT-A) standard therapy alleviates mentioned symptoms presumably due to its peripheral neuromuscular actions alone, the aim of present study was to examine for the first time the toxin's trans-synaptic activity within central circuits that govern the skilled movement. The rat hindlimb motor pools were targeted by BoNT-A intrasciatic bilateral injection (2 U per nerve), while its trans-synaptic action on premotor inputs was blocked by intrathecal BoNT-A-neutralising antitoxin (5 i.u.). Effects of BoNT-A on coordinated and high intensity motor tasks (rotarod, beamwalk swimming), and localised muscle weakness (digit abduction, gait ability) were followed until their substantial recovery by day 56 post BoNT-A. Later, (day 62-77) the BoNT-A effects were examined in unilateral calf muscle spasm evoked by tetanus toxin (TeNT, 1.5 ng). In comparison to peripheral effect alone, combined peripheral and central trans-synaptic BoNT-A action induced a more prominent and longer impairment of different motor tasks, as well as the localised muscle weakness. After near-complete recovery of motor functions, the BoNT-A maintained the ability to reduce the experimental calf spasm evoked by tetanus toxin (TeNT 1.5 ng, day 62) without altering the monosynaptic reflex excitability. These results indicate that, in addition to muscle terminals, BoNT-A-mediated control of hyperactive muscle activity in movement disorders and spasticity may involve the spinal premotor inputs and central circuits participating in the skilled locomotor performance.
Collapse
Affiliation(s)
- Petra Šoštarić
- Laboratory of Molecular Neuropharmacology, Department of Pharmacology and Croatian Institute of Brain Research, University of Zagreb School of Medicine, Šalata 11, 10000, Zagreb, Croatia
| | - Magdalena Matić
- Laboratory of Molecular Neuropharmacology, Department of Pharmacology and Croatian Institute of Brain Research, University of Zagreb School of Medicine, Šalata 11, 10000, Zagreb, Croatia; Division of Neurobiology, Department of Neurology, Medical University of Innsbruck, Innsbruck, Austria
| | - Dalia Nemanić
- Department of Pharmacology, Faculty of Pharmacy and Biochemistry, University of Zagreb, Domagojeva 2, 10 000, Zagreb, Croatia
| | - Željka Lučev Vasić
- University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, Croatia
| | - Mario Cifrek
- University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, Croatia
| | - Marco Pirazzini
- Department of Biomedical Sciences, University of Padova, via Ugo Bassi 58/B 35131, Padova, Italy; Interdepartmental Research Center of Myology CIR-Myo, University of Padova, Via Ugo Bassi 58/B, 35131, Padova, Italy
| | - Ivica Matak
- Laboratory of Molecular Neuropharmacology, Department of Pharmacology and Croatian Institute of Brain Research, University of Zagreb School of Medicine, Šalata 11, 10000, Zagreb, Croatia.
| |
Collapse
|
3
|
Hernández S, Salvany S, Casanovas A, Piedrafita L, Soto-Bernardini MC, Tarabal O, Blasco A, Gras S, Gatius A, Schwab MH, Calderó J, Esquerda JE. Persistent NRG1 Type III Overexpression in Spinal Motor Neurons Has No Therapeutic Effect on ALS-Related Pathology in SOD1 G93A Mice. Neurotherapeutics 2023; 20:1820-1834. [PMID: 37733208 PMCID: PMC10684470 DOI: 10.1007/s13311-023-01424-x] [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] [Accepted: 07/31/2023] [Indexed: 09/22/2023] Open
Abstract
Amyotrophic lateral sclerosis (ALS) is a devastating neurodegenerative disease affecting upper and lower motor neurons (MNs). Neuregulin-1 (NRG1) is a pleiotropic growth factor that has been shown to be potentially valuable for ALS when supplemented by means of viral-mediated gene therapy. However, these results are inconsistent with other reports. An alternative approach for investigating the therapeutic impact of NRG1 on ALS is the use of transgenic mouse lines with genetically defined NRG1 overexpression. Here, we took advantage of a mouse line with NRG1 type III overexpression in spinal cord α motor neurons (MN) to determine the impact of steadily enhanced NRG1 signalling on mutant superoxide dismutase 1 (SOD1)-induced disease. The phenotype of SOD1G93A-NRG1 double transgenic mice was analysed in detail, including neuropathology and extensive behavioural testing. At least 3 animals per condition and sex were histopathologically assessed, and a minimum of 10 mice per condition and sex were clinically evaluated. The accumulation of misfolded SOD1 (mfSOD1), MN degeneration, and a glia-mediated neuroinflammatory response are pathological hallmarks of ALS progression in SOD1G93A mice. None of these aspects was significantly improved when examined in double transgenic NRG1-SOD1G93A mice. In addition, behavioural testing revealed that NRG1 type III overexpression did not affect the survival of SOD1G93A mice but accelerated disease onset and worsened the motor phenotype.
Collapse
Affiliation(s)
- Sara Hernández
- Unitat de Neurobiologia Cel·lular, Departament de Medicina Experimental, Facultat de Medicina, Universitat de Lleida and Institut de Recerca Biomèdica de Lleida (IRBLleida), Lleida, Catalonia, Spain
| | - Sara Salvany
- Unitat de Neurobiologia Cel·lular, Departament de Medicina Experimental, Facultat de Medicina, Universitat de Lleida and Institut de Recerca Biomèdica de Lleida (IRBLleida), Lleida, Catalonia, Spain
| | - Anna Casanovas
- Unitat de Neurobiologia Cel·lular, Departament de Medicina Experimental, Facultat de Medicina, Universitat de Lleida and Institut de Recerca Biomèdica de Lleida (IRBLleida), Lleida, Catalonia, Spain
| | - Lídia Piedrafita
- Unitat de Neurobiologia Cel·lular, Departament de Medicina Experimental, Facultat de Medicina, Universitat de Lleida and Institut de Recerca Biomèdica de Lleida (IRBLleida), Lleida, Catalonia, Spain
| | - M Clara Soto-Bernardini
- Department of Neurology, University Hospital Leipzig, Leipzig, Germany
- Center for Research in Biotechnology (CIB), Costa Rica Institute of Technology (TEC), Cartago, Costa Rica
| | - Olga Tarabal
- Unitat de Neurobiologia Cel·lular, Departament de Medicina Experimental, Facultat de Medicina, Universitat de Lleida and Institut de Recerca Biomèdica de Lleida (IRBLleida), Lleida, Catalonia, Spain
| | - Alba Blasco
- Unitat de Neurobiologia Cel·lular, Departament de Medicina Experimental, Facultat de Medicina, Universitat de Lleida and Institut de Recerca Biomèdica de Lleida (IRBLleida), Lleida, Catalonia, Spain
| | - Sílvia Gras
- Unitat de Neurobiologia Cel·lular, Departament de Medicina Experimental, Facultat de Medicina, Universitat de Lleida and Institut de Recerca Biomèdica de Lleida (IRBLleida), Lleida, Catalonia, Spain
| | - Alaó Gatius
- Unitat de Neurobiologia Cel·lular, Departament de Medicina Experimental, Facultat de Medicina, Universitat de Lleida and Institut de Recerca Biomèdica de Lleida (IRBLleida), Lleida, Catalonia, Spain
| | - Markus H Schwab
- Paul Flechsig Institute of Neuropathology, University Hospital Leipzig, Leipzig, Germany
| | - Jordi Calderó
- Unitat de Neurobiologia Cel·lular, Departament de Medicina Experimental, Facultat de Medicina, Universitat de Lleida and Institut de Recerca Biomèdica de Lleida (IRBLleida), Lleida, Catalonia, Spain
| | - Josep E Esquerda
- Unitat de Neurobiologia Cel·lular, Departament de Medicina Experimental, Facultat de Medicina, Universitat de Lleida and Institut de Recerca Biomèdica de Lleida (IRBLleida), Lleida, Catalonia, Spain.
| |
Collapse
|
4
|
Bak AN, Djukic S, Kadlecova M, Braunstein TH, Jensen DB, Meehan CF. Cytoplasmic TDP-43 accumulation drives changes in C-bouton number and size in a mouse model of sporadic Amyotrophic Lateral Sclerosis. Mol Cell Neurosci 2023; 125:103840. [PMID: 36921783 DOI: 10.1016/j.mcn.2023.103840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 02/11/2023] [Accepted: 03/04/2023] [Indexed: 03/14/2023] Open
Abstract
An altered neuronal excitability of spinal motoneurones has consistently been implicated in Amyotrophic Lateral Sclerosis (ALS) leading to several investigations of synaptic input to these motoneurones. One such input that has repeatedly been shown to be affected is a population of large cholinergic synapses terminating mainly on the soma of the motoneurones referred to as C-boutons. Most research on these synapses during disease progression has used transgenic Superoxide Dismutase 1 (SOD1) mouse models of the disease which have not only produced conflicting findings, but also fail to recapitulate the key pathological feature seen in ALS; cytoplasmic accumulations of TAR DNA-binding protein 43 (TDP-43). Additionally, they fail to distinguish between slow and fast motoneurones, the latter of which have more C-boutons, but are lost earlier in the disease. To circumvent these issues, we quantified the frequency and volume of C-boutons on traced soleus and gastrocnemius motoneurones, representing predominantly slow and fast motor pools respectively. Experiments were performed using the TDP-43ΔNLS mouse model that carries a transgenic construct of TDP-43 devoid of its nuclear localization signal, preventing its nuclear import. This results in the emergence of pathological TDP-43 inclusions in the cytoplasm, modelling the main pathology seen in this disorder, accompanied by a severe and lethal ALS phenotype. Our results confirmed changes in both the number and volume of C-boutons with a decrease in number on the more vulnerable, predominantly fast gastrocnemius motoneurones and an increase in number on the less vulnerable, predominantly slow soleus motoneurones. Importantly, these changes were only found in male mice. However, both sexes and motor pools showed a decrease in C-bouton volume. Our experiments confirm that cytoplasmic TDP-43 accumulation is sufficient to drive C-bouton changes.
Collapse
Affiliation(s)
| | - Svetlana Djukic
- Department of Neuroscience, University of Copenhagen, Denmark
| | | | | | | | | |
Collapse
|
5
|
Kissane RWP, Ghaffari-Rafi A, Tickle PG, Chakrabarty S, Egginton S, Brownstone RM, Smith CC. C-bouton components on rat extensor digitorum longus motoneurons are resistant to chronic functional overload. J Anat 2021; 241:1157-1168. [PMID: 33939175 PMCID: PMC9558151 DOI: 10.1111/joa.13439] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 03/17/2021] [Accepted: 03/18/2021] [Indexed: 02/06/2023] Open
Abstract
Mammalian motor systems adapt to the demands of their environment. For example, muscle fibre types change in response to increased load or endurance demands. However, for adaptations to be effective, motoneurons must adapt such that their properties match those of the innervated muscle fibres. We used a rat model of chronic functional overload to assess adaptations to both motoneuron size and a key modulatory synapse responsible for amplification of motor output, C‐boutons. Overload of extensor digitorum longus (EDL) muscles was induced by removal of their synergists, tibialis anterior muscles. Following 21 days survival, EDL muscles showed an increase in fatigue resistance and a decrease in force output, indicating a shift to a slower phenotype. These changes were reflected by a decrease in motoneuron size. However, C‐bouton complexes remained largely unaffected by overload. The C‐boutons themselves, quantified by expression of vesicular acetylcholine transporter, were similar in size and density in the control and overload conditions. Expression of the post‐synaptic voltage‐gated potassium channel (KV2.1) was also unchanged. Small conductance calcium‐activated potassium channels (SK3) were expressed in most EDL motoneurons, despite this being an almost exclusively fast motor pool. Overload induced a decrease in the proportion of SK3+ cells, however, there was no change in density or size of clusters. We propose that reductions in motoneuron size may promote early recruitment of EDL motoneurons, but that C‐bouton plasticity is not necessary to increase the force output required in response to muscle overload.
Collapse
Affiliation(s)
- Roger W P Kissane
- Institute of Ageing & Chronic Disease, University of Liverpool, Liverpool, UK.,School of Biomedical Sciences, University of Leeds, Leeds, UK
| | - Arash Ghaffari-Rafi
- Department of Neuromuscular Diseases, UCL Queen Square Institute of Neurology, University College London, London, UK
| | - Peter G Tickle
- School of Biomedical Sciences, University of Leeds, Leeds, UK
| | | | - Stuart Egginton
- School of Biomedical Sciences, University of Leeds, Leeds, UK
| | - Robert M Brownstone
- Department of Neuromuscular Diseases, UCL Queen Square Institute of Neurology, University College London, London, UK
| | - Calvin C Smith
- Department of Neuromuscular Diseases, UCL Queen Square Institute of Neurology, University College London, London, UK
| |
Collapse
|
6
|
Shadrach JL, Gomez-Frittelli J, Kaltschmidt JA. Proprioception revisited: where do we stand? CURRENT OPINION IN PHYSIOLOGY 2021; 21:23-28. [PMID: 34222735 DOI: 10.1016/j.cophys.2021.02.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Originally referred to as 'muscle sense', the notion that skeletal muscle held a peripheral sensory function was first described early in the 19th century. Foundational experiments by Sherrington in the early 20th century definitively demonstrated that proprioceptors contained within skeletal muscle, tendons, and joints are innervated by sensory neurons and play an important role in the control of movement. In this review, we will highlight several recent advances in the ongoing effort to further define the molecular diversity underlying the proprioceptive sensorimotor system. Together, the work summarized here represents our current understanding of sensorimotor circuit formation during development and the mechanisms that regulate the integration of proprioceptive feedback into the spinal circuits that control locomotion in both normal and diseased states.
Collapse
Affiliation(s)
- Jennifer L Shadrach
- Department of Neurosurgery, Stanford University, Stanford, CA, 94305, USA.,Wu Tsai Neurosciences Institute, Stanford University, Stanford, CA, 94305, USA
| | - Julieta Gomez-Frittelli
- Wu Tsai Neurosciences Institute, Stanford University, Stanford, CA, 94305, USA.,Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Julia A Kaltschmidt
- Department of Neurosurgery, Stanford University, Stanford, CA, 94305, USA.,Wu Tsai Neurosciences Institute, Stanford University, Stanford, CA, 94305, USA
| |
Collapse
|
7
|
Zholudeva LV, Abraira VE, Satkunendrarajah K, McDevitt TC, Goulding MD, Magnuson DSK, Lane MA. Spinal Interneurons as Gatekeepers to Neuroplasticity after Injury or Disease. J Neurosci 2021; 41:845-854. [PMID: 33472820 PMCID: PMC7880285 DOI: 10.1523/jneurosci.1654-20.2020] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 12/15/2020] [Accepted: 12/17/2020] [Indexed: 12/15/2022] Open
Abstract
Spinal interneurons are important facilitators and modulators of motor, sensory, and autonomic functions in the intact CNS. This heterogeneous population of neurons is now widely appreciated to be a key component of plasticity and recovery. This review highlights our current understanding of spinal interneuron heterogeneity, their contribution to control and modulation of motor and sensory functions, and how this role might change after traumatic spinal cord injury. We also offer a perspective for how treatments can optimize the contribution of interneurons to functional improvement.
Collapse
Affiliation(s)
| | - Victoria E Abraira
- Department of Cell Biology & Neuroscience, Rutgers University, The State University of New Jersey, New Jersey, 08854
| | - Kajana Satkunendrarajah
- Departments of Neurosurgery and Physiology, Medical College of Wisconsin, Wisconsin, 53226
- Clement J. Zablocki Veterans Affairs Medical Center, Milwaukee, Wisconsin, 53295
| | - Todd C McDevitt
- Gladstone Institutes, San Francisco, California, 94158
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, California, 94143
| | | | - David S K Magnuson
- University of Louisville, Kentucky Spinal Cord Injury Research Center, Louisville, Kentucky, 40208
| | - Michael A Lane
- Department of Neurobiology and Anatomy, and the Marion Murray Spinal Cord Research Center, Drexel University, Philadelphia, Pennsylvania, 19129
| |
Collapse
|
8
|
Mille T, Quilgars C, Cazalets J, Bertrand SS. Acetylcholine and spinal locomotor networks: The insider. Physiol Rep 2021; 9:e14736. [PMID: 33527727 PMCID: PMC7851432 DOI: 10.14814/phy2.14736] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Revised: 01/05/2021] [Accepted: 01/07/2021] [Indexed: 01/07/2023] Open
Abstract
This article aims to review studies that have investigated the role of neurons that use the transmitter acetylcholine (ACh) in controlling the operation of locomotor neural networks within the spinal cord. This cholinergic system has the particularity of being completely intraspinal. We describe the different effects exerted by spinal cholinergic neurons on locomotor circuitry by the pharmacological activation or blockade of this propriospinal system, as well as describing its different cellular and subcellular targets. Through the activation of one ionotropic receptor, the nicotinic receptor, and five metabotropic receptors, the M1 to M5 muscarinic receptors, the cholinergic system exerts a powerful control both on synaptic transmission and locomotor network neuron excitability. Although tremendous advances have been made in our understanding of the spinal cholinergic system's involvement in the physiology and pathophysiology of locomotor networks, gaps still remain, including the precise role of the different subtypes of cholinergic neurons as well as their pre- and postsynaptic partners. Improving our knowledge of the propriospinal cholinergic system is of major relevance to finding new cellular targets and therapeutics in countering the debilitating effects of neurodegenerative diseases and restoring motor functions after spinal cord injury.
Collapse
Affiliation(s)
- Théo Mille
- Université de BordeauxCNRS UMR 5287INCIABordeauxFrance
| | | | | | | |
Collapse
|
9
|
Deardorff AS, Romer SH, Fyffe RE. Location, location, location: the organization and roles of potassium channels in mammalian motoneurons. J Physiol 2021; 599:1391-1420. [DOI: 10.1113/jp278675] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Accepted: 01/08/2021] [Indexed: 11/08/2022] Open
Affiliation(s)
- Adam S. Deardorff
- Department of Neuroscience, Cell Biology and Physiology, Wright State University Boonshoft School of Medicine Dayton OH 45435 USA
- Department of Neurology and Internal Medicine, Wright State University Boonshoft School of Medicine Dayton OH 45435 USA
| | - Shannon H. Romer
- Odyssey Systems Environmental Health Effects Laboratory, Navy Medical Research Unit‐Dayton Wright‐Patterson Air Force Base OH 45433 USA
| | - Robert E.W. Fyffe
- Department of Neuroscience, Cell Biology and Physiology, Wright State University Boonshoft School of Medicine Dayton OH 45435 USA
| |
Collapse
|