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Sagalajev B, Zhang T, Abdollahi N, Yousefpour N, Medlock L, Al-Basha D, Ribeiro-da-Silva A, Esteller R, Ratté S, Prescott SA. Absence of paresthesia during high-rate spinal cord stimulation reveals importance of synchrony for sensations evoked by electrical stimulation. Neuron 2024; 112:404-420.e6. [PMID: 37972595 DOI: 10.1016/j.neuron.2023.10.021] [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: 06/19/2023] [Revised: 08/24/2023] [Accepted: 10/18/2023] [Indexed: 11/19/2023]
Abstract
Electrically activating mechanoreceptive afferents inhibits pain. However, paresthesia evoked by spinal cord stimulation (SCS) at 40-60 Hz becomes uncomfortable at high pulse amplitudes, limiting SCS "dosage." Kilohertz-frequency SCS produces analgesia without paresthesia and is thought, therefore, not to activate afferent axons. We show that paresthesia is absent not because axons do not spike but because they spike asynchronously. In a pain patient, selectively increasing SCS frequency abolished paresthesia and epidurally recorded evoked compound action potentials (ECAPs). Dependence of ECAP amplitude on SCS frequency was reproduced in pigs, rats, and computer simulations and is explained by overdrive desynchronization: spikes desychronize when axons are stimulated faster than their refractory period. Unlike synchronous spikes, asynchronous spikes fail to produce paresthesia because their transmission to somatosensory cortex is blocked by feedforward inhibition. Our results demonstrate how stimulation frequency impacts synchrony based on axon properties and how synchrony impacts sensation based on circuit properties.
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Affiliation(s)
- Boriss Sagalajev
- Neurosciences and Mental Health, The Hospital for Sick Children, Toronto, ON M5G 0A4, Canada
| | - Tianhe Zhang
- Boston Scientific Neuromodulation, Valencia, CA 25155, USA
| | - Nooshin Abdollahi
- Neurosciences and Mental Health, The Hospital for Sick Children, Toronto, ON M5G 0A4, Canada; Institute of Biomedical Engineering, University of Toronto, Toronto, ON M5S 3G9, Canada
| | - Noosha Yousefpour
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC H3G 1Y6, Canada
| | - Laura Medlock
- Neurosciences and Mental Health, The Hospital for Sick Children, Toronto, ON M5G 0A4, Canada; Institute of Biomedical Engineering, University of Toronto, Toronto, ON M5S 3G9, Canada
| | - Dhekra Al-Basha
- Neurosciences and Mental Health, The Hospital for Sick Children, Toronto, ON M5G 0A4, Canada; Department of Physiology, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Alfredo Ribeiro-da-Silva
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC H3G 1Y6, Canada; Department of Anatomy and Cell Biology, McGill University, Montreal, QC H3A 0C7, Canada
| | | | - Stéphanie Ratté
- Neurosciences and Mental Health, The Hospital for Sick Children, Toronto, ON M5G 0A4, Canada
| | - Steven A Prescott
- Neurosciences and Mental Health, The Hospital for Sick Children, Toronto, ON M5G 0A4, Canada; Institute of Biomedical Engineering, University of Toronto, Toronto, ON M5S 3G9, Canada; Department of Physiology, University of Toronto, Toronto, ON M5S 1A8, Canada.
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2
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Zamfir M, Sharif B, Locke S, Ehrlich AT, Ochandarena NE, Scherrer G, Ribeiro-da-Silva A, Kieffer BL, Séguéla P. Distinct and sex-specific expression of mu opioid receptors in anterior cingulate and somatosensory S1 cortical areas. Pain 2023; 164:703-716. [PMID: 35973045 PMCID: PMC10026835 DOI: 10.1097/j.pain.0000000000002751] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [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: 04/14/2022] [Revised: 06/24/2022] [Accepted: 07/22/2022] [Indexed: 11/25/2022]
Abstract
ABSTRACT The anterior cingulate cortex (ACC) processes the affective component of pain, whereas the primary somatosensory cortex (S1) is involved in its sensory-discriminative component. Injection of morphine in the ACC has been reported to be analgesic, and endogenous opioids in this area are required for pain relief. Mu opioid receptors (MORs) are expressed in both ACC and S1; however, the identity of MOR-expressing cortical neurons remains unknown. Using the Oprm1-mCherry mouse line, we performed selective patch clamp recordings of MOR+ neurons, as well as immunohistochemistry with validated neuronal markers, to determine the identity and laminar distribution of MOR+ neurons in ACC and S1. We found that the electrophysiological signatures of MOR+ neurons differ significantly between these 2 areas, with interneuron-like firing patterns more frequent in ACC. While MOR+ somatostatin interneurons are more prominent in ACC, MOR+ excitatory neurons and MOR+ parvalbumin interneurons are more prominent in S1. Our results suggest a differential contribution of MOR-mediated modulation to ACC and S1 outputs. We also found that females had a greater density of MOR+ neurons compared with males in both areas. In summary, we conclude that MOR-dependent opioidergic signaling in the cortex displays sexual dimorphisms and likely evolved to meet the distinct function of pain-processing circuits in limbic and sensory cortical areas.
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Affiliation(s)
- Maria Zamfir
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC, Canada
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
| | - Behrang Sharif
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC, Canada
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
- Department of Physiology, McGill University, Montreal, QC, Canada
| | - Samantha Locke
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | - Aliza T. Ehrlich
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
- Douglas Hospital Research Institute, McGill University, Montreal, QC, Canada
| | - Nicole E. Ochandarena
- Department of Cell Biology and Physiology The University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Grégory Scherrer
- Department of Cell Biology and Physiology The University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
- UNC Neuroscience Center The University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
- Department of Pharmacology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Alfredo Ribeiro-da-Silva
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | - Brigitte L. Kieffer
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
- Douglas Hospital Research Institute, McGill University, Montreal, QC, Canada
| | - Philippe Séguéla
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC, Canada
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
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3
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Derue H, Ribeiro-da-Silva A. Therapeutic exercise interventions in rat models of arthritis. Neurobiol Pain 2023; 13:100130. [PMID: 37179770 PMCID: PMC10172998 DOI: 10.1016/j.ynpai.2023.100130] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 04/20/2023] [Accepted: 04/21/2023] [Indexed: 05/15/2023]
Abstract
Arthritis is the leading cause of musculoskeletal pain and disability worldwide. Nearly 50% of individuals over the age of 65 have arthritis, which contributes to limited function, articular pain, physical inactivity, and diminished quality of life. Therapeutic exercise is often recommended in clinical settings for patients experiencing arthritic pain, however, there is little practical guidance regarding the use of therapeutic exercise to alleviate arthritic musculoskeletal pain. Rodent models of arthritis allow researchers to control experimental variables, which cannot be done with human participants, providing an opportunity to test therapeutic approaches in preclinical models. This literature review provides a summary of published findings in therapeutic exercise interventions in rat models of arthritis as well as gaps in the existing literature. We reveal that preclinical research in this field has yet to adequately investigate the impact of experimental variables in therapeutic exercise including their modality, intensity, duration, and frequency on joint pathophysiology and pain outcomes.
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Affiliation(s)
- Hannah Derue
- Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
| | - Alfredo Ribeiro-da-Silva
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
- Department of Anatomy and Cell Biology, McGill University, Montreal, QC, Canada
- Corresponding author at: Department of Pharmacology and Therapeutics, McGill University, 3655 Promenade Sir William Osler, Montreal, QC H3G 1Y6, Canada.
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4
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Tansley S, Gu N, Guzmán AU, Cai W, Wong C, Lister K, Muñoz-Pino E, Yousefpour N, Roome RB, Heal J, Wu N, Castonguay A, Lean G, Muir EM, Kania A, Prager-Khoutorsky M, Zhang J, Gkogkas CG, Fawcett JW, Diatchenko L, Ribeiro-da-Silva A, De Koninck Y, Mogil JS, Khoutorsky A. Microglia-mediated degradation of perineuronal nets promotes pain. Science 2022; 377:80-86. [PMID: 35617374 DOI: 10.1126/science.abl6773] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Activation of microglia in the spinal cord dorsal horn following peripheral nerve injury contributes to the development of pain hypersensitivity. How activated microglia selectively enhance the activity of spinal nociceptive circuits is not well understood. We discovered that following peripheral nerve injury, microglia degrade extracellular matrix structures, perineuronal nets (PNNs), in lamina I of the spinal cord dorsal horn. Lamina I PNNs selectively enwrap spinoparabrachial projection neurons, which integrate nociceptive information in the spinal cord and convey it to supraspinal brain regions to induce pain sensation. Degradation of PNNs by microglia enhances the activity of projection neurons and induces pain-related behaviors. Thus, nerve injury-induced degradation of PNNs is a mechanism by which microglia selectively augment the output of spinal nociceptive circuits and cause pain hypersensitivity.
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Affiliation(s)
- Shannon Tansley
- Department of Anesthesia, McGill University, Montreal, Quebec, Canada.,Department of Psychology, Faculty of Science, McGill University, Montreal, Quebec, Canada
| | - Ning Gu
- Department of Anesthesia, McGill University, Montreal, Quebec, Canada
| | - Alba Ureña Guzmán
- Department of Anesthesia, McGill University, Montreal, Quebec, Canada
| | - Weihua Cai
- Department of Anesthesia, McGill University, Montreal, Quebec, Canada
| | - Calvin Wong
- Department of Anesthesia, McGill University, Montreal, Quebec, Canada
| | - Kevin Lister
- Department of Anesthesia, McGill University, Montreal, Quebec, Canada
| | - Einer Muñoz-Pino
- Department of Psychiatry and Neuroscience, CERVO Brain Research Centre, Université Laval, Quebec, QC, Canada
| | - Noosha Yousefpour
- Departement of Pharmacology and Therapeutics, McGill University, Montreal, Quebec, Canada
| | - R Brian Roome
- Institut de Recherches Cliniques de Montreal (IRCM), Montreal, QC, Canada
| | - Jordyn Heal
- Department of Anesthesia, McGill University, Montreal, Quebec, Canada
| | - Neil Wu
- Department of Anesthesia, McGill University, Montreal, Quebec, Canada
| | - Annie Castonguay
- Department of Psychiatry and Neuroscience, CERVO Brain Research Centre, Université Laval, Quebec, QC, Canada
| | - Graham Lean
- Department of Physiology, McGill University, Montreal, Quebec, Canada
| | - Elizabeth M Muir
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, UK
| | - Artur Kania
- Institut de Recherches Cliniques de Montreal (IRCM), Montreal, QC, Canada.,Departement of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada
| | | | - Ji Zhang
- Department of Neurology and Neurosurgery, McGill University, Montreal, Québec, Canada.,Faculty of Dental Medicine and Oral Health Sciences, Montreal, Quebec, Canada.,Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - Christos G Gkogkas
- Biomedical Research Institute, Foundation for Research and Technology-Hellas, University Campus, 45110 Ioannina, Greece
| | - James W Fawcett
- John van Geest Centre for Brain Repair, Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK.,Centre for Reconstructive Neuroscience, Institute for Experimental Medicine CAS, Prague, Czech Republic
| | - Luda Diatchenko
- Department of Anesthesia, McGill University, Montreal, Quebec, Canada.,Faculty of Dental Medicine and Oral Health Sciences, Montreal, Quebec, Canada.,Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - Alfredo Ribeiro-da-Silva
- Departement of Pharmacology and Therapeutics, McGill University, Montreal, Quebec, Canada.,Departement of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada.,Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - Yves De Koninck
- Department of Psychiatry and Neuroscience, CERVO Brain Research Centre, Université Laval, Quebec, QC, Canada.,Departement of Pharmacology and Therapeutics, McGill University, Montreal, Quebec, Canada.,Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - Jeffrey S Mogil
- Department of Psychology, Faculty of Science, McGill University, Montreal, Quebec, Canada.,Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - Arkady Khoutorsky
- Department of Anesthesia, McGill University, Montreal, Quebec, Canada.,Faculty of Dental Medicine and Oral Health Sciences, Montreal, Quebec, Canada.,Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
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5
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Wong C, Barkai O, Wang F, Thörn Pérez C, Lev S, Cai W, Tansley S, Yousefpour N, Hooshmandi M, Lister KC, Latif M, Cuello AC, Prager-Khoutorsky M, Mogil JS, Séguéla P, De Koninck Y, Ribeiro-da-Silva A, Binshtok AM, Khoutorsky A. mTORC2 mediates structural plasticity in distal nociceptive endings that contributes to pain hypersensitivity following inflammation. J Clin Invest 2022; 132:152635. [PMID: 35579957 PMCID: PMC9337825 DOI: 10.1172/jci152635] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 06/23/2021] [Accepted: 05/13/2022] [Indexed: 11/29/2022] Open
Abstract
The encoding of noxious stimuli into action potential firing is largely mediated by nociceptive free nerve endings. Tissue inflammation, by changing the intrinsic properties of the nociceptive endings, leads to nociceptive hyperexcitability and thus to the development of inflammatory pain. Here, we showed that tissue inflammation–induced activation of the mammalian target of rapamycin complex 2 (mTORC2) triggers changes in the architecture of nociceptive terminals and leads to inflammatory pain. Pharmacological activation of mTORC2 induced elongation and branching of nociceptor peripheral endings and caused long-lasting pain hypersensitivity. Conversely, nociceptor-specific deletion of the mTORC2 regulatory protein rapamycin-insensitive companion of mTOR (Rictor) prevented inflammation-induced elongation and branching of cutaneous nociceptive fibers and attenuated inflammatory pain hypersensitivity. Computational modeling demonstrated that mTORC2-mediated structural changes in the nociceptive terminal tree are sufficient to increase the excitability of nociceptors. Targeting mTORC2 using a single injection of antisense oligonucleotide against Rictor provided long-lasting alleviation of inflammatory pain hypersensitivity. Collectively, we showed that tissue inflammation–induced activation of mTORC2 causes structural plasticity of nociceptive free nerve endings in the epidermis and inflammatory hyperalgesia, representing a therapeutic target for inflammatory pain.
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Affiliation(s)
- Calvin Wong
- Department of Anesthesia, McGill University, Montreal, Canada
| | - Omer Barkai
- Department of Medical Neurobiology, The Hebrew University, Jerusalem, Israel
| | - Feng Wang
- Department of Psychiatry and Neuroscience, Université Laval, Quebec City, Canada
| | | | - Shaya Lev
- Department of Medical Neurobiology, The Hebrew University, Jerusalem, Israel
| | - Weihua Cai
- Department of Anesthesia, McGill University, Montreal, Canada
| | - Shannon Tansley
- Department of Psychology, McGill University, Montreal, Canada
| | - Noosha Yousefpour
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada
| | | | - Kevin C Lister
- Department of Anesthesia, McGill University, Montreal, Canada
| | - Mariam Latif
- Department of Anesthesia, McGill University, Montreal, Canada
| | - A Claudio Cuello
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada
| | | | - Jeffrey S Mogil
- Department of Psychology, McGill University, Montreal, Canada
| | - Philippe Séguéla
- Department of Neurology and Neurosurgery, McGill University, Montreal, Canada
| | - Yves De Koninck
- Department of Psychiatry and Neuroscience, Université Laval, Quebec City, Canada
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6
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Muralidharan A, Sotocinal SG, Yousefpour N, Akkurt N, Lima LV, Tansley S, Parisien M, Wang C, Austin JS, Ham B, Dutra GM, Rousseau P, Maldonado-Bouchard S, Clark T, Rosen SF, Majeed MR, Silva O, Nejade R, Li X, Donayre Pimentel S, Nielsen CS, Neely GG, Autexier C, Diatchenko L, Ribeiro-da-Silva A, Mogil JS. Long-term male-specific chronic pain via telomere- and p53‑mediated spinal cord cellular senescence. J Clin Invest 2022; 132:151817. [PMID: 35426375 PMCID: PMC9012275 DOI: 10.1172/jci151817] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 03/08/2022] [Indexed: 12/13/2022] Open
Abstract
Mice with experimental nerve damage can display long‑lasting neuropathic pain behavior. We show here that 4 months and later after nerve injury, male but not female mice displayed telomere length (TL) reduction and p53‑mediated cellular senescence in the spinal cord, resulting in maintenance of pain and associated with decreased lifespan. Nerve injury increased the number of p53‑positive spinal cord neurons, astrocytes, and microglia, but only in microglia was the increase male‑specific, matching a robust sex specificity of TL reduction in this cell type, which has been previously implicated in male‑specific pain processing. Pain hypersensitivity was reversed by repeated intrathecal administration of a p53‑specific senolytic peptide, only in male mice and only many months after injury. Analysis of UK Biobank data revealed sex-specific relevance of this pathway in humans, featuring male‑specific genetic association of the human p53 locus (TP53) with chronic pain and a male-specific effect of chronic pain on mortality. Our findings demonstrate the existence of a biological mechanism maintaining pain behavior, at least in males, occurring much later than the time span of virtually all extant preclinical studies.
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Affiliation(s)
- Arjun Muralidharan
- Department of Psychology, McGill University, Montreal, Quebec, Canada
- Charles Perkins Centre, The University of Sydney, Camperdown, New South Wales, Australia
| | | | | | - Nur Akkurt
- Department of Psychology, McGill University, Montreal, Quebec, Canada
| | - Lucas V. Lima
- Department of Psychology, McGill University, Montreal, Quebec, Canada
| | - Shannon Tansley
- Department of Psychology, McGill University, Montreal, Quebec, Canada
| | | | - Chengyang Wang
- Department of Psychology, McGill University, Montreal, Quebec, Canada
| | | | - Boram Ham
- Department of Psychology, McGill University, Montreal, Quebec, Canada
| | | | - Philippe Rousseau
- Bloomfield Centre for Research in Aging, McGill University, Montreal, Quebec, Canada
| | | | - Teleri Clark
- Charles Perkins Centre, The University of Sydney, Camperdown, New South Wales, Australia
| | - Sarah F. Rosen
- Department of Psychology, McGill University, Montreal, Quebec, Canada
| | - Mariam R. Majeed
- Department of Psychology, McGill University, Montreal, Quebec, Canada
| | - Olivia Silva
- Department of Psychology, McGill University, Montreal, Quebec, Canada
| | - Rachel Nejade
- Department of Psychology, McGill University, Montreal, Quebec, Canada
| | - Xinyu Li
- Charles Perkins Centre, The University of Sydney, Camperdown, New South Wales, Australia
| | | | - Christopher S. Nielsen
- Department of Chronic Diseases and Ageing, Norwegian Institute of Public Health, Oslo, Norway
- Department of Pain Management and Research, Oslo University Hospital, Oslo, Norway
| | - G. Gregory Neely
- Charles Perkins Centre, The University of Sydney, Camperdown, New South Wales, Australia
| | - Chantal Autexier
- Bloomfield Centre for Research in Aging, McGill University, Montreal, Quebec, Canada
| | | | | | - Jeffrey S. Mogil
- Department of Psychology, McGill University, Montreal, Quebec, Canada
- Department of Anesthesia, McGill University, Montreal, Quebec, Canada
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7
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Locke S, Yousefpour N, Ribeiro-da-Silva A. Dorsal horn disinhibition and movement-induced behaviour in a rat model of inflammatory arthritis. Rheumatology (Oxford) 2021; 60:918-928. [PMID: 32910183 DOI: 10.1093/rheumatology/keaa396] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 03/01/2020] [Revised: 06/08/2020] [Indexed: 01/08/2023] Open
Abstract
OBJECTIVES Alterations beyond joint inflammation such as changes in dorsal horn (DH) excitability contribute to pain in inflammatory arthritis (IA). More complete understanding of specific underlying mechanisms will be important to define novel targets for the treatment of IA pain. Pre-clinical models are useful, but relevant pain assays are vital for successful clinical translation. For this purpose, a method is presented to assess movement-induced pain-related behaviour changes that was subsequently used to investigate DH disinhibition in IA. METHODS IA was induced by intra-articular injection of complete Freund's adjuvant (CFA) in male rats, and weight distribution was assessed before and after walking on a treadmill. To confirm increased activity in nociception-related pathways, fos expression was assessed in the superficial DH, including in nociceptive neurons, identified by neurokinin 1 (NK1) immunoreactivity, and interneurons. Inhibitory terminal density onto NK1+ neurons was assessed and lastly, a cohort of animals was treated for 3 days with gabapentin. RESULTS At 4 weeks post-CFA, walking reduced weight distribution to the affected joint and increased DH fos expression, including in NK1+ neurons. Neuronal activity in inhibitory cells and inhibitory terminal density on NK1+ neurons were decreased in CFA-treated animals compared with controls. Treatment with gabapentin led to recovered behaviour and DH neuronal activity pattern in CFA-treated animals. CONCLUSION We describe an assay to assess movement-induced pain-related behaviour changes in a rodent IA model. Furthermore, our results suggest that disinhibition may contribute to pain related to movement in IA.
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Affiliation(s)
- Samantha Locke
- Department of Pharmacology and Therapeutics, Montreal, Quebec, Canada.,Alan Edwards Centre for Research on Pain, Montreal, Quebec, Canada
| | - Noosha Yousefpour
- Department of Pharmacology and Therapeutics, Montreal, Quebec, Canada.,Alan Edwards Centre for Research on Pain, Montreal, Quebec, Canada
| | - Alfredo Ribeiro-da-Silva
- Department of Pharmacology and Therapeutics, Montreal, Quebec, Canada.,Alan Edwards Centre for Research on Pain, Montreal, Quebec, Canada.,Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada
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8
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Sharif B, Ase AR, Ribeiro-da-Silva A, Séguéla P. Differential Coding of Itch and Pain by a Subpopulation of Primary Afferent Neurons. Neuron 2020; 106:940-951.e4. [PMID: 32298640 DOI: 10.1016/j.neuron.2020.03.021] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 10/21/2019] [Accepted: 03/20/2020] [Indexed: 12/21/2022]
Abstract
Itch and pain are distinct unpleasant sensations that can be triggered from the same receptive fields in the skin, raising the question of how pruriception and nociception are coded and discriminated. Here, we tested the multimodal capacity of peripheral first-order neurons, focusing on the genetically defined subpopulation of mouse C-fibers that express the chloroquine receptor MrgprA3. Using optogenetics, chemogenetics, and pharmacology, we assessed the behavioral effects of their selective stimulation in a wide variety of conditions. We show that metabotropic Gq-linked stimulation of these C-afferents, through activation of native MrgprA3 receptors or DREADDs, evokes stereotypical pruriceptive rather than nocifensive behaviors. In contrast, fast ionotropic stimulation of these same neurons through light-gated cation channels or native ATP-gated P2X3 channels predominantly evokes nocifensive rather than pruriceptive responses. We conclude that C-afferents display intrinsic multimodality, and we provide evidence that optogenetic and chemogenetic interventions on the same neuronal populations can drive distinct behavioral outputs.
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Affiliation(s)
- Behrang Sharif
- Montreal Neurological Institute, Department of Neurology & Neurosurgery, McGill University, Montreal, QC H3A 2B4, Canada; Alan Edwards Centre for Research on Pain, Montreal, QC H3A 0G1, Canada; Department of Physiology, McGill University, Montreal, QC H3G 1Y6, Canada
| | - Ariel R Ase
- Montreal Neurological Institute, Department of Neurology & Neurosurgery, McGill University, Montreal, QC H3A 2B4, Canada; Alan Edwards Centre for Research on Pain, Montreal, QC H3A 0G1, Canada
| | - Alfredo Ribeiro-da-Silva
- Alan Edwards Centre for Research on Pain, Montreal, QC H3A 0G1, Canada; Department of Pharmacology & Therapeutics, McGill University, Montreal, QC H3G 1Y6, Canada
| | - Philippe Séguéla
- Montreal Neurological Institute, Department of Neurology & Neurosurgery, McGill University, Montreal, QC H3A 2B4, Canada; Alan Edwards Centre for Research on Pain, Montreal, QC H3A 0G1, Canada.
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9
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Lorenzo LE, Godin AG, Ferrini F, Bachand K, Plasencia-Fernandez I, Labrecque S, Girard AA, Boudreau D, Kianicka I, Gagnon M, Doyon N, Ribeiro-da-Silva A, De Koninck Y. Enhancing neuronal chloride extrusion rescues α2/α3 GABA A-mediated analgesia in neuropathic pain. Nat Commun 2020; 11:869. [PMID: 32054836 PMCID: PMC7018745 DOI: 10.1038/s41467-019-14154-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 12/16/2019] [Indexed: 02/06/2023] Open
Abstract
Spinal disinhibition has been hypothesized to underlie pain hypersensitivity in neuropathic pain. Apparently contradictory mechanisms have been reported, raising questions on the best target to produce analgesia. Here, we show that nerve injury is associated with a reduction in the number of inhibitory synapses in the spinal dorsal horn. Paradoxically, this is accompanied by a BDNF-TrkB-mediated upregulation of synaptic GABAARs and by an α1-to-α2GABAAR subunit switch, providing a mechanistic rationale for the analgesic action of the α2,3GABAAR benzodiazepine-site ligand L838,417 after nerve injury. Yet, we demonstrate that impaired Cl- extrusion underlies the failure of L838,417 to induce analgesia at high doses due to a resulting collapse in Cl- gradient, dramatically limiting the benzodiazepine therapeutic window. In turn, enhancing KCC2 activity not only potentiated L838,417-induced analgesia, it rescued its analgesic potential at high doses, revealing a novel strategy for analgesia in pathological pain, by combined targeting of the appropriate GABAAR-subtypes and restoring Cl- homeostasis.
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Affiliation(s)
- Louis-Etienne Lorenzo
- CERVO Brain Research Centre, Quebec Mental Health Institute, Québec, QC, Canada
- Department of Pharmacology & Therapeutics, McGill University, Montreal, QC, Canada
| | - Antoine G Godin
- CERVO Brain Research Centre, Quebec Mental Health Institute, Québec, QC, Canada
- Department of Psychiatry & Neuroscience, Université Laval, Québec, QC, Canada
- Graduate program in Neuroscience, Université Laval, Québec, QC, Canada
| | - Francesco Ferrini
- CERVO Brain Research Centre, Quebec Mental Health Institute, Québec, QC, Canada
- Department of Psychiatry & Neuroscience, Université Laval, Québec, QC, Canada
- Graduate program in Neuroscience, Université Laval, Québec, QC, Canada
- Department of Veterinary Sciences, University of Turin, Turin, Italy
| | - Karine Bachand
- CERVO Brain Research Centre, Quebec Mental Health Institute, Québec, QC, Canada
| | - Isabel Plasencia-Fernandez
- CERVO Brain Research Centre, Quebec Mental Health Institute, Québec, QC, Canada
- Graduate program in Neuroscience, Université Laval, Québec, QC, Canada
| | - Simon Labrecque
- CERVO Brain Research Centre, Quebec Mental Health Institute, Québec, QC, Canada
| | - Alexandre A Girard
- CERVO Brain Research Centre, Quebec Mental Health Institute, Québec, QC, Canada
- Ecole Polytechnique, IP Paris, Palaiseau, France
| | - Dominic Boudreau
- CERVO Brain Research Centre, Quebec Mental Health Institute, Québec, QC, Canada
- Graduate program in Neuroscience, Université Laval, Québec, QC, Canada
| | - Irenej Kianicka
- Chlorion Pharma, Laval, Québec, QC, Canada
- Laurent Pharmaceuticals Inc., Montreal, QC, Canada
| | - Martin Gagnon
- CERVO Brain Research Centre, Quebec Mental Health Institute, Québec, QC, Canada
- Centre for Innovation, University of Otago, Dunedin, New Zealand
| | - Nicolas Doyon
- CERVO Brain Research Centre, Quebec Mental Health Institute, Québec, QC, Canada
- Finite Element Interdisciplinary Research Group (GIREF), Université Laval, Québec, QC, Canada
| | - Alfredo Ribeiro-da-Silva
- Department of Pharmacology & Therapeutics, McGill University, Montreal, QC, Canada
- Department of Anatomy & Cell Biology, McGill University, Montreal, QC, Canada
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
| | - Yves De Koninck
- CERVO Brain Research Centre, Quebec Mental Health Institute, Québec, QC, Canada.
- Department of Pharmacology & Therapeutics, McGill University, Montreal, QC, Canada.
- Department of Psychiatry & Neuroscience, Université Laval, Québec, QC, Canada.
- Graduate program in Neuroscience, Université Laval, Québec, QC, Canada.
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada.
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10
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Castonguay A, Lorenzo LE, Wiseman PW, Ribeiro-da-Silva A, De Koninck Y, Godin AG. Revealing Abnormal Oligomerization of Proteins in Single Cells. Biophys J 2019. [DOI: 10.1016/j.bpj.2018.11.2292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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11
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Pina-Cabral JM, Ribeiro-da-Silva A, Almeida-Dias A. Platelet Sequestration During Hypothermia in Dogs Treated with Sulphinpyrazone and Ticlopidine - Reversibility Accelerated After Intra-Abdominal Rewarming. Thromb Haemost 2018. [DOI: 10.1055/s-0038-1660144] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
SummaryDuring body cooling, a progressive thrombocytopenia is observed, with platelet sequestration mainly in the liver. Platelets return progressively to the circulation during re warming. In this work the presence of platelet clumps is demonstrated by electron microscopy inside the hepatic sinusoids of dogs cooled to 20° C by immersion in iced water. Such clumps were not found either before cooling or after body rewarming. Similar platelet clumps in the hepatic microcirculation were found in two other groups of dogs cooled and rewarmed as before, but previously treated with the antiaggregants sulphinpyrazone or ticlopidine. Another group of dogs was cooled and rewarmed by intra-abdominal circulation of physiological saline respectively at 4° C and 40° C. In these animals a similar decrease of circulating platelets was observed. However, just after re warming was started, with the body temperature still at 22° C, sequestered platelets came back abruptly to circulation. We conclude that hepatic platelet sequestration induced by hypothermia appears mainly due to local haemodynamic conditions.
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Affiliation(s)
- J M Pina-Cabral
- The Centro de Fisiologia da Hemóstase (INIC), Depts. of Physiology and Histology and Embryology, Porto Medical School, Hospital de S. Joäo, Porto, Portugal
| | - A Ribeiro-da-Silva
- The Centro de Fisiologia da Hemóstase (INIC), Depts. of Physiology and Histology and Embryology, Porto Medical School, Hospital de S. Joäo, Porto, Portugal
| | - A Almeida-Dias
- The Centro de Fisiologia da Hemóstase (INIC), Depts. of Physiology and Histology and Embryology, Porto Medical School, Hospital de S. Joäo, Porto, Portugal
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12
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Cordeiro Matos S, Zamfir M, Longo G, Ribeiro-da-Silva A, Séguéla P. Noradrenergic fiber sprouting and altered transduction in neuropathic prefrontal cortex. Brain Struct Funct 2017; 223:1149-1164. [PMID: 29094305 DOI: 10.1007/s00429-017-1543-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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: 04/06/2017] [Accepted: 10/19/2017] [Indexed: 12/22/2022]
Abstract
Functional changes in hyperpolarization-activated and cyclic nucleotide-gated (HCN) channels have been shown to contribute to medial prefrontal (mPFC) hyperexcitability after peripheral nerve injury. A reduction in the open probability of these neuronal channels might be relevant since this can enhance membrane input resistance and synaptic summation. However, the molecular mechanisms underlying neuropathy-associated alterations in HCN channel activity remain elusive. Using the spared nerve injury model of neuropathic pain in Long-Evans rats, we first discovered a significant increase in noradrenergic innervation within the mPFC of nerve-injured compared to control animals. Patch-clamp recordings in layer II/III pyramidal neurons of the mPFC revealed that adrenoceptors, primarily the α2 subtype, can modulate the voltage-dependent activation of HCN channels and the abnormal prefrontal excitability following peripheral neuropathy. Additionally, microinfusions of the α2 adrenoceptor agonist clonidine in the mPFC of neuropathic rats provided analgesic effects, indicating the behavioral significance for this noradrenergic pathway in manifestations of the chronic pain state. Taken together, our results provide insights into the role of cortical catecholaminergic neuromodulation in neuropathic pain and suggest that altered noradrenergic transduction may play a major role in the HCN channel dysfunction and pyramidal hyperactivity observed in several chronic pain conditions.
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Affiliation(s)
- Steven Cordeiro Matos
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, 3801 University, Montreal, QC, H3A 2B4, Canada.,Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, H3A 0G1, Canada
| | - Maria Zamfir
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, 3801 University, Montreal, QC, H3A 2B4, Canada.,Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, H3A 0G1, Canada
| | - Geraldine Longo
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, H3A 0G1, Canada.,Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, H3G 1Y6, Canada
| | - Alfredo Ribeiro-da-Silva
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, H3A 0G1, Canada.,Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, H3G 1Y6, Canada
| | - Philippe Séguéla
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, 3801 University, Montreal, QC, H3A 2B4, Canada. .,Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, H3A 0G1, Canada.
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13
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Martin LJ, Smith SB, Khoutorsky A, Magnussen CA, Samoshkin A, Sorge RE, Cho C, Yosefpour N, Sivaselvachandran S, Tohyama S, Cole T, Khuong TM, Mir E, Gibson DG, Wieskopf JS, Sotocinal SG, Austin JS, Meloto CB, Gitt JH, Gkogkas C, Sonenberg N, Greenspan JD, Fillingim RB, Ohrbach R, Slade GD, Knott C, Dubner R, Nackley AG, Ribeiro-da-Silva A, Neely GG, Maixner W, Zaykin DV, Mogil JS, Diatchenko L. Epiregulin and EGFR interactions are involved in pain processing. J Clin Invest 2017; 127:3353-3366. [PMID: 28783046 DOI: 10.1172/jci87406] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 06/27/2017] [Indexed: 12/27/2022] Open
Abstract
The EGFR belongs to the well-studied ErbB family of receptor tyrosine kinases. EGFR is activated by numerous endogenous ligands that promote cellular growth, proliferation, and tissue regeneration. In the present study, we have demonstrated a role for EGFR and its natural ligand, epiregulin (EREG), in pain processing. We show that inhibition of EGFR with clinically available compounds strongly reduced nocifensive behavior in mouse models of inflammatory and chronic pain. EREG-mediated activation of EGFR enhanced nociception through a mechanism involving the PI3K/AKT/mTOR pathway and matrix metalloproteinase-9. Moreover, EREG application potentiated capsaicin-induced calcium influx in a subset of sensory neurons. Both the EGFR and EREG genes displayed a genetic association with the development of chronic pain in several clinical cohorts of temporomandibular disorder. Thus, EGFR and EREG may be suitable therapeutic targets for persistent pain conditions.
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Affiliation(s)
- Loren J Martin
- Department of Psychology and Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada.,Department of Psychology, University of Toronto Mississauga, Mississauga, Ontario, Canada
| | - Shad B Smith
- Center for Neurosensory Disorders, University of North Carolina, Chapel Hill, North Carolina, USA
| | - Arkady Khoutorsky
- Department of Biochemistry and Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - Claire A Magnussen
- Department of Pharmacology and Therapeutics and Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - Alexander Samoshkin
- Department of Anesthesia, Faculty of Dentistry and Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - Robert E Sorge
- Department of Psychology and Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - Chulmin Cho
- Department of Psychology, University of Toronto Mississauga, Mississauga, Ontario, Canada
| | - Noosha Yosefpour
- Department of Pharmacology and Therapeutics and Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | | | - Sarasa Tohyama
- Department of Psychology, University of Toronto Mississauga, Mississauga, Ontario, Canada
| | - Tiffany Cole
- Charles Perkins Centre and School of Life and Environmental Sciences, The University of Sydney, Sydney, Australia
| | - Thang M Khuong
- Charles Perkins Centre and School of Life and Environmental Sciences, The University of Sydney, Sydney, Australia
| | - Ellen Mir
- Center for Neurosensory Disorders, University of North Carolina, Chapel Hill, North Carolina, USA
| | - Dustin G Gibson
- Center for Neurosensory Disorders, University of North Carolina, Chapel Hill, North Carolina, USA
| | - Jeffrey S Wieskopf
- Department of Psychology and Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - Susana G Sotocinal
- Department of Psychology and Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - Jean Sebastien Austin
- Department of Psychology and Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - Carolina B Meloto
- Department of Anesthesia, Faculty of Dentistry and Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - Joseph H Gitt
- Center for Neurosensory Disorders, University of North Carolina, Chapel Hill, North Carolina, USA
| | - Christos Gkogkas
- Department of Biochemistry and Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - Nahum Sonenberg
- Department of Biochemistry and Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - Joel D Greenspan
- Department of Neural and Pain Sciences and Brotman Facial Pain Center, University of Maryland Dental School, Baltimore, Maryland, USA
| | - Roger B Fillingim
- Department of Community Dentistry and Behavioral Science, University of Florida, Gainesville, Florida, USA
| | - Richard Ohrbach
- Department of Oral Diagnostic Services, University at Buffalo, Buffalo, New York, USA
| | - Gary D Slade
- Department of Dental Ecology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Charles Knott
- Battelle Memorial Institute, Durham, North Carolina, USA
| | - Ronald Dubner
- Department of Neural and Pain Sciences and Brotman Facial Pain Center, University of Maryland Dental School, Baltimore, Maryland, USA
| | - Andrea G Nackley
- Center for Neurosensory Disorders, University of North Carolina, Chapel Hill, North Carolina, USA
| | - Alfredo Ribeiro-da-Silva
- Department of Pharmacology and Therapeutics and Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - G Gregory Neely
- Charles Perkins Centre and School of Life and Environmental Sciences, The University of Sydney, Sydney, Australia
| | - William Maixner
- Center for Neurosensory Disorders, University of North Carolina, Chapel Hill, North Carolina, USA
| | - Dmitri V Zaykin
- National Institutes of Environmental Health Sciences, NIH, Research Triangle Park, North Carolina, USA
| | - Jeffrey S Mogil
- Department of Psychology and Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
| | - Luda Diatchenko
- Department of Anesthesia, Faculty of Dentistry and Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, Canada
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14
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Abstract
Chronic pain affects a third of the population and current treatments produce limited relief and severe side effects. An alternative strategy to decrease pain would be to directly modulate somatosensory pathways using optogenetics. Optogenetics involves the use of genetically encoded and optically active proteins, namely opsins, to control neuronal circuits. In preclinical animal models, optical silencing of peripheral nociceptors has been shown to alleviate both inflammatory and neuropathic pain. An opsin-based gene therapy to treat chronic pain patients is not ready yet, but encouraging advances have been made in optical and viral technology. In view of the increasing burden of chronic pain in our aging society, innovative analgesic approaches based on optogenetics are definitely worth exploring.
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Affiliation(s)
- Hélène Beaudry
- Department of Neurology & Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Canada.,The Alan Edwards Centre for Research on Pain, McGill University, Montreal, Canada.,Department of Pharmacology & Therapeutics, McGill University, Montreal, Canada
| | - Ihab Daou
- Department of Neurology & Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Canada.,The Alan Edwards Centre for Research on Pain, McGill University, Montreal, Canada
| | - Alfredo Ribeiro-da-Silva
- The Alan Edwards Centre for Research on Pain, McGill University, Montreal, Canada.,Department of Pharmacology & Therapeutics, McGill University, Montreal, Canada
| | - Philippe Séguéla
- Department of Neurology & Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Canada.,The Alan Edwards Centre for Research on Pain, McGill University, Montreal, Canada
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15
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Bhosle VK, Rivera JC, Zhou TE, Omri S, Sanchez M, Hamel D, Zhu T, Rouget R, Rabea AA, Hou X, Lahaie I, Ribeiro-da-Silva A, Chemtob S. Erratum: Nuclear localization of platelet-activating factor receptor controls retinal neovascularization. Cell Discov 2016; 2:16034. [PMID: 27672445 PMCID: PMC5029542 DOI: 10.1038/celldisc.2016.34] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Affiliation(s)
- Vikrant K Bhosle
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, Canada; CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada; Department of Ophthalmology, Research Centre of Hôpital Maisonneuve-Rosemont, University of Montréal, Montréal, QC, Canada
| | - José Carlos Rivera
- CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada; Department of Ophthalmology, Research Centre of Hôpital Maisonneuve-Rosemont, University of Montréal, Montréal, QC, Canada
| | - Tianwei Ellen Zhou
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, Canada; CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada; Department of Ophthalmology, Research Centre of Hôpital Maisonneuve-Rosemont, University of Montréal, Montréal, QC, Canada; Department of Medicine, McGill University Health Center, Montreal, QC, Canada
| | - Samy Omri
- CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada; Department of Ophthalmology, Research Centre of Hôpital Maisonneuve-Rosemont, University of Montréal, Montréal, QC, Canada
| | - Melanie Sanchez
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, Canada; CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada; Department of Ophthalmology, Research Centre of Hôpital Maisonneuve-Rosemont, University of Montréal, Montréal, QC, Canada
| | - David Hamel
- CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada; Department of Pharmacology, University of Montréal, Montréal, QC, Canada
| | - Tang Zhu
- CHU Sainte Justine Hospital Research Centre, University of Montréal , Montréal, QC, Canada
| | - Raphael Rouget
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, Canada; CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada
| | - Areej Al Rabea
- Experimental Surgery, Montreal General Hospital, McGill University , Montréal, QC, Canada
| | - Xin Hou
- CHU Sainte Justine Hospital Research Centre, University of Montréal , Montréal, QC, Canada
| | - Isabelle Lahaie
- CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada; Department of Ophthalmology, Research Centre of Hôpital Maisonneuve-Rosemont, University of Montréal, Montréal, QC, Canada
| | - Alfredo Ribeiro-da-Silva
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, Canada; Alan Edwards Centre for Research on Pain, McGill University, Montréal, QC, Canada; Department of Anatomy and Cell Biology, McGill University, Montréal, QC, Canada
| | - Sylvain Chemtob
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, Canada; CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada; Department of Ophthalmology, Research Centre of Hôpital Maisonneuve-Rosemont, University of Montréal, Montréal, QC, Canada; Department of Pharmacology, University of Montréal, Montréal, QC, Canada; Departments of Pediatrics and Ophthalmology, Faculty of Medicine, University of Montréal, Montréal, QC, Canada
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16
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Bhosle VK, Rivera JC, Zhou TE, Omri S, Sanchez M, Hamel D, Zhu T, Rouget R, Rabea AA, Hou X, Lahaie I, Ribeiro-da-Silva A, Chemtob S. Nuclear localization of platelet-activating factor receptor controls retinal neovascularization. Cell Discov 2016; 2:16017. [PMID: 27462464 PMCID: PMC4941644 DOI: 10.1038/celldisc.2016.17] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 05/11/2016] [Indexed: 02/08/2023] Open
Abstract
Platelet-activating factor (PAF) is a pleiotropic phospholipid with proinflammatory, procoagulant and angiogenic actions on the vasculature. We and others have reported the presence of PAF receptor (Ptafr) at intracellular sites such as the nucleus. However, mechanisms of localization and physiologic functions of intracellular Ptafr remain poorly understood. We hereby identify the importance of C-terminal motif of the receptor and uncover novel roles of Rab11a GTPase and importin-5 in nuclear translocation of Ptafr in primary human retinal microvascular endothelial cells. Nuclear localization of Ptafr is independent of exogenous PAF stimulation as well as intracellular PAF biosynthesis. Moreover, nuclear Ptafr is responsible for the upregulation of unique set of growth factors, including vascular endothelial growth factor, in vitro and ex vivo. We further corroborate the intracrine PAF signaling, resulting in angiogenesis in vivo, using Ptafr antagonists with distinct plasma membrane permeability. Collectively, our findings show that nuclear Ptafr translocates in an agonist-independent manner, and distinctive functions of Ptafr based on its cellular localization point to another dimension needed for pharmacologic selectivity of drugs.
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Affiliation(s)
- Vikrant K Bhosle
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, Canada; CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada; Department of Ophthalmology, Research Centre of Hôpital Maisonneuve-Rosemont, University of Montréal, Montréal, QC, Canada
| | - José Carlos Rivera
- CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada; Department of Ophthalmology, Research Centre of Hôpital Maisonneuve-Rosemont, University of Montréal, Montréal, QC, Canada
| | - Tianwei Ellen Zhou
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, Canada; CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada; Department of Ophthalmology, Research Centre of Hôpital Maisonneuve-Rosemont, University of Montréal, Montréal, QC, Canada; Department of Medicine, McGill University Health Center, Montreal, QC, Canada
| | - Samy Omri
- CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada; Department of Ophthalmology, Research Centre of Hôpital Maisonneuve-Rosemont, University of Montréal, Montréal, QC, Canada
| | - Melanie Sanchez
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, Canada; CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada; Department of Ophthalmology, Research Centre of Hôpital Maisonneuve-Rosemont, University of Montréal, Montréal, QC, Canada
| | - David Hamel
- CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada; Department of Pharmacology, University of Montréal, Montréal, QC, Canada
| | - Tang Zhu
- CHU Sainte Justine Hospital Research Centre, University of Montréal , Montréal, QC, Canada
| | - Raphael Rouget
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, Canada; CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada
| | - Areej Al Rabea
- Experimental Surgery, Montreal General Hospital, McGill University , Montréal, QC, Canada
| | - Xin Hou
- CHU Sainte Justine Hospital Research Centre, University of Montréal , Montréal, QC, Canada
| | - Isabelle Lahaie
- CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada; Department of Ophthalmology, Research Centre of Hôpital Maisonneuve-Rosemont, University of Montréal, Montréal, QC, Canada
| | - Alfredo Ribeiro-da-Silva
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, Canada; Alan Edwards Centre for Research on Pain, McGill University, Montréal, QC, Canada; Department of Anatomy and Cell Biology, McGill University, Montréal, QC, Canada
| | - Sylvain Chemtob
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, Canada; CHU Sainte Justine Hospital Research Centre, University of Montréal, Montréal, QC, Canada; Department of Ophthalmology, Research Centre of Hôpital Maisonneuve-Rosemont, University of Montréal, Montréal, QC, Canada; Department of Pharmacology, University of Montréal, Montréal, QC, Canada; Departments of Pediatrics and Ophthalmology, Faculty of Medicine, University of Montréal, Montréal, QC, Canada
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17
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Khoutorsky A, Bonin RP, Sorge RE, Gkogkas CG, Pawlowski SA, Jafarnejad SM, Pitcher MH, Alain T, Perez-Sanchez J, Salter EW, Martin L, Ribeiro-da-Silva A, De Koninck Y, Cervero F, Mogil JS, Sonenberg N. Translational control of nociception via 4E-binding protein 1. eLife 2015; 4. [PMID: 26678009 PMCID: PMC4695384 DOI: 10.7554/elife.12002] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [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: 10/01/2015] [Accepted: 11/01/2015] [Indexed: 12/31/2022] Open
Abstract
Activation of the mechanistic/mammalian target of rapamycin (mTOR) kinase in models of acute and chronic pain is strongly implicated in mediating enhanced translation and hyperalgesia. However, the molecular mechanisms by which mTOR regulates nociception remain unclear. Here we show that deletion of the eukaryotic initiation factor 4E-binding protein 1 (4E-BP1), a major mTOR downstream effector, which represses eIF4E activity and cap-dependent translation, leads to mechanical, but not thermal pain hypersensitivity. Mice lacking 4E-BP1 exhibit enhanced spinal cord expression of neuroligin 1, a cell-adhesion postsynaptic protein regulating excitatory synapse function, and show increased excitatory synaptic input into spinal neurons, and a lowered threshold for induction of synaptic potentiation. Pharmacological inhibition of eIF4E or genetic reduction of neuroligin 1 levels normalizes the increased excitatory synaptic activity and reverses mechanical hypersensitivity. Thus, translational control by 4E-BP1 downstream of mTOR effects the expression of neuroligin 1 and excitatory synaptic transmission in the spinal cord, and thereby contributes to enhanced mechanical nociception. DOI:http://dx.doi.org/10.7554/eLife.12002.001 Despite the unpleasant feeling it causes, pain is necessary for survival as it helps individuals to avoid objects, environments and situations that cause damage to their body. However, millions of people experience long-lasting “chronic” pain, or are hypersensitive to pain. There are few treatments available for these conditions, but these treatments do not work well for the majority of patients, and can have serious side effects. To develop new treatments, researchers must first better understand how chronic pain develops. Pain is transmitted to the brain in the form of electrical signals “fired” along nerve fibers. Different nerves transmit information about different types of pain: for example, pain caused by a sharp object pressed against the skin activates a different set of neurons to those activated when touching something dangerously hot. Studies in mice have suggested that a protein called mTOR that is found inside neurons is important for them to fire pain signals. However, it is not clear exactly how mTOR contributes to pain signaling, although it is known to affect the activities of several other proteins in neurons. One protein that mTOR affects the activity of is called 4E-BP1. Now, Khoutorsky, Bonin, Sorge et al. show that mice that lack 4E-BP1 behave in ways that suggest they are hypersensitive to poking or pinching sensations. However, the mice did not show hypersensitivity when they touched a hot surface. Further investigation revealed that the neurons in the spinal cord of mice that lack 4E-BP1 produce abnormally high amounts of a molecule called neuroligin 1, which makes the neurons more likely to fire and thus signal pain. Khoutorsky, Bonin, Sorge et al. found that treating mice that lack 4E-BP1 with a compound that reduces neuroligin 1 production causes their neurons to fire more normally. This also reduces the animals’ apparent signs of hypersensitivity to pressure on their skin. It will be important in future studies to identify additional targets of 4E-BP1 in the spinal cord that could contribute to increased mechanical sensation, and also to study the role of 4E-BP1 in peripheral nerves. DOI:http://dx.doi.org/10.7554/eLife.12002.002
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Affiliation(s)
- Arkady Khoutorsky
- Department of Biochemistry, McGill University, Montréal, Canada.,Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montréal, Canada
| | - Robert P Bonin
- Unité de neurosciences cellulaires et moléculaire, Institut universitaire en santé mentale de Québec, Québec, Canada
| | - Robert E Sorge
- Department of Psychology, McGill University, Montréal, Canada.,Alan Edwards Centre for Research on Pain, McGill University, Montréal, Canada
| | - Christos G Gkogkas
- Department of Biochemistry, McGill University, Montréal, Canada.,Centre for Integrative Physiology and The Patrick Wild Centre, University of Edinburgh, Edinburgh, United Kingdom
| | - Sophie Anne Pawlowski
- Alan Edwards Centre for Research on Pain, McGill University, Montréal, Canada.,Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada
| | - Seyed Mehdi Jafarnejad
- Department of Biochemistry, McGill University, Montréal, Canada.,Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montréal, Canada
| | - Mark H Pitcher
- National Center for Complementary and Alternative Medicine, National Institutes of Health, Porter Neuroscience Research Center, Maryland, United States
| | - Tommy Alain
- Department of Biochemistry, McGill University, Montréal, Canada.,Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montréal, Canada
| | - Jimena Perez-Sanchez
- Unité de neurosciences cellulaires et moléculaire, Institut universitaire en santé mentale de Québec, Québec, Canada
| | - Eric W Salter
- Unité de neurosciences cellulaires et moléculaire, Institut universitaire en santé mentale de Québec, Québec, Canada
| | - Loren Martin
- Department of Psychology, McGill University, Montréal, Canada.,Alan Edwards Centre for Research on Pain, McGill University, Montréal, Canada
| | - Alfredo Ribeiro-da-Silva
- Alan Edwards Centre for Research on Pain, McGill University, Montréal, Canada.,Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada
| | - Yves De Koninck
- Unité de neurosciences cellulaires et moléculaire, Institut universitaire en santé mentale de Québec, Québec, Canada.,Alan Edwards Centre for Research on Pain, McGill University, Montréal, Canada.,Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada.,Department of Psychiatry and Neuroscience, Université Laval, Québec, Canada
| | - Fernando Cervero
- Alan Edwards Centre for Research on Pain, McGill University, Montréal, Canada.,Anesthesia Research Unit, McGill University, Montreal, Canada
| | - Jeffrey S Mogil
- Department of Psychology, McGill University, Montréal, Canada.,Alan Edwards Centre for Research on Pain, McGill University, Montréal, Canada
| | - Nahum Sonenberg
- Department of Biochemistry, McGill University, Montréal, Canada.,Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montréal, Canada
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18
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Abdelaziz DM, Abdullah S, Magnussen C, Ribeiro-da-Silva A, Komarova SV, Rauch F, Stone LS. Behavioral signs of pain and functional impairment in a mouse model of osteogenesis imperfecta. Bone 2015; 81:400-406. [PMID: 26277094 DOI: 10.1016/j.bone.2015.08.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 07/29/2015] [Accepted: 08/03/2015] [Indexed: 01/19/2023]
Abstract
Osteogenesis imperfecta (OI) is a congenital disorder caused most often by dominant mutations in the COL1A1 or COL1A2 genes that encode the alpha chains of type I collagen. Severe forms of OI are associated with skeletal deformities and frequent fractures. Skeletal pain can occur acutely after fracture, but also arises chronically without preceding fractures. In this study we assessed OI-associated pain in the Col1a1Jrt/+ mouse, a recently developed model of severe dominant OI. Similar to severe OI in humans, this mouse has significant skeletal abnormalities and develops spontaneous fractures, joint dislocations and vertebral deformities. In this model, we investigated behavioral measures of pain and functional impairment. Significant hypersensitivity to mechanical, heat and cold stimuli, assessed by von Frey filaments, radiant heat paw withdrawal and the acetone tests, respectively, were observed in OI compared to control wildtype littermates. OI mice also displayed reduced motor activity in the running wheel and open field assays. Immunocytochemical analysis revealed no changes between OI and WT mice in innervation of the glabrous skin of the hindpaw or in expression of the pain-related neuropeptide calcitonin gene-related protein in sensory neurons. In contrast, increased sensitivity to mechanical and cold stimulation strongly correlated with the extent of skeletal deformities in OI mice. Thus, we demonstrated that the Col1a1Jrt/+ mouse model of severe OI has hypersensitivity to mechanical and thermal stimuli, consistent with a state of chronic pain.
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Affiliation(s)
- Dareen M Abdelaziz
- Faculty of Dentistry, McGill University, Montreal, QC, Canada; Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
| | - Sami Abdullah
- Shriners Hospitals for Children-Canada and McGill University, Montreal, QC, Canada
| | - Claire Magnussen
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada; Department of Pharmacology & Therapeutics, Faculty of Medicine, McGill University, Montreal, QC, Canada; Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada
| | - Alfredo Ribeiro-da-Silva
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada; Department of Pharmacology & Therapeutics, Faculty of Medicine, McGill University, Montreal, QC, Canada; Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada; Department of Anatomy and Cell Biology, McGill University, Montreal, QC, Canada
| | - Svetlana V Komarova
- Faculty of Dentistry, McGill University, Montreal, QC, Canada; Shriners Hospitals for Children-Canada and McGill University, Montreal, QC, Canada
| | - Frank Rauch
- Shriners Hospitals for Children-Canada and McGill University, Montreal, QC, Canada
| | - Laura S Stone
- Faculty of Dentistry, McGill University, Montreal, QC, Canada; Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada; Department of Pharmacology & Therapeutics, Faculty of Medicine, McGill University, Montreal, QC, Canada; Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada; Department of Anaesthesiology, Faculty of Medicine, McGill University, Montreal, QC, Canada.
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19
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Petitjean H, Pawlowski SA, Fraine SL, Sharif B, Hamad D, Fatima T, Berg J, Brown CM, Jan LY, Ribeiro-da-Silva A, Braz JM, Basbaum AI, Sharif-Naeini R. Dorsal Horn Parvalbumin Neurons Are Gate-Keepers of Touch-Evoked Pain after Nerve Injury. Cell Rep 2015; 13:1246-1257. [PMID: 26527000 PMCID: PMC6038918 DOI: 10.1016/j.celrep.2015.09.080] [Citation(s) in RCA: 194] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Revised: 09/04/2015] [Accepted: 09/25/2015] [Indexed: 01/01/2023] Open
Abstract
Neuropathic pain is a chronic debilitating disease that results from nerve damage, persists long after the injury has subsided, and is characterized by spontaneous pain and mechanical hypersensitivity. Although loss of inhibitory tone in the dorsal horn of the spinal cord is a major contributor to neuropathic pain, the molecular and cellular mechanisms underlying this disinhibition are unclear. Here, we combined pharmacogenetic activation and selective ablation approaches in mice to define the contribution of spinal cord parvalbumin (PV)-expressing inhibitory interneurons in naive and neuropathic pain conditions. Ablating PV neurons in naive mice produce neuropathic pain-like mechanical allodynia via disinhibition of PKCγ excitatory interneurons. Conversely, activating PV neurons in nerve-injured mice alleviates mechanical hypersensitivity. These findings indicate that PV interneurons are modality-specific filters that gate mechanical but not thermal inputs to the dorsal horn and that increasing PV inter-neuron activity can ameliorate the mechanical hypersensitivity that develops following nerve injury.
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Affiliation(s)
- Hugues Petitjean
- Department of Physiology and Cell Information Systems Group, McGill University, Montreal, H3G0B1 QC, Canada
| | | | - Steven Li Fraine
- Department of Physiology and Cell Information Systems Group, McGill University, Montreal, H3G0B1 QC, Canada
| | - Behrang Sharif
- Department of Physiology and Cell Information Systems Group, McGill University, Montreal, H3G0B1 QC, Canada
| | - Doulia Hamad
- Department of Physiology and Cell Information Systems Group, McGill University, Montreal, H3G0B1 QC, Canada
| | - Tarheen Fatima
- Department of Physiology and Cell Information Systems Group, McGill University, Montreal, H3G0B1 QC, Canada
| | - Jim Berg
- Departments of Physiology and Biochemistry, Howard Hughes Medical Institute, University of California, San Francisco, 1550 4th Street, RH-490D, San Francisco, CA 94158, USA
| | - Claire M Brown
- Department of Physiology and Cell Information Systems Group, McGill University, Montreal, H3G0B1 QC, Canada; Advanced BioImaging Facility, McGill University, H3G0B1 QC, Canada
| | - Lily-Yeh Jan
- Departments of Physiology and Biochemistry, Howard Hughes Medical Institute, University of California, San Francisco, 1550 4th Street, RH-490D, San Francisco, CA 94158, USA
| | - Alfredo Ribeiro-da-Silva
- Department of Pharmacology and Therapeutics, McGill University, H3G1Y6 QC, Canada; Department of Anatomy and Cell Biology, McGill University, H3A0C7 QC, Canada
| | - Joao M Braz
- Department of Anatomy, University of California, San Francisco, 1550 4th Street, RH-348E, San Francisco, CA 94158, USA
| | - Allan I Basbaum
- Department of Anatomy, University of California, San Francisco, 1550 4th Street, RH-348E, San Francisco, CA 94158, USA
| | - Reza Sharif-Naeini
- Department of Physiology and Cell Information Systems Group, McGill University, Montreal, H3G0B1 QC, Canada.
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20
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Nascimento FP, Magnussen C, Yousefpour N, Ribeiro-da-Silva A. Sympathetic fibre sprouting in the skin contributes to pain-related behaviour in spared nerve injury and cuff models of neuropathic pain. Mol Pain 2015; 11:59. [PMID: 26376854 PMCID: PMC4574171 DOI: 10.1186/s12990-015-0062-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Accepted: 09/08/2015] [Indexed: 02/06/2023] Open
Abstract
Background Cuff and spared nerve injury (SNI) in the sciatic territory are widely used to model neuropathic pain. Because nociceptive information is first detected in skin, it is important to understand how alterations in peripheral innervation contribute to pain in each model. Over 16 weeks in male rats, changes in sensory and autonomic innervation of the skin were described after cuff and SNI using immunohistochemistry to label myelinated (neurofilament 200 positive—NF200+) and peptidergic (calcitonin gene-related peptide positive—CGRP+) primary afferents and sympathetic fibres (dopamine β-hydroxylase positive—DBH+) Results Cuff and SNI caused an early loss and later reinnervation of NF200 and CGRP fibres in the plantar hind paw skin. In both models, DBH+ fibres sprouted into the upper dermis of the plantar skin 4 and 6 weeks after injury. Despite these similarities, behavioural pain measures were significantly different in each model. Sympathectomy using guanethidine significantly alleviated mechanical allodynia 6 weeks after cuff, when peak sympathetic sprouting was observed, having no effect at 2 weeks, when fibres were absent. In SNI animals, mechanical allodynia in the lateral paw was significantly improved by guanethidine at 2 and 6 weeks, and the development of cold hyperalgesia, which roughly paralleled the appearance of ectopic sympathetic fibres, was alleviated by guanethidine at 6 weeks. Sympathetic fibres did not sprout into the dorsal root ganglia at 2 or 6 weeks, indicating their unimportance to pain behaviour in these two models. Conclusions Alterations in sympathetic innervation in the skin represents an important mechanism that contributes to pain in cuff and SNI models of neuropathic pain.
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Affiliation(s)
- Francisney P Nascimento
- Department of Pharmacology and Therapeutics, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Room 1215, Montreal, QC, H3G 1Y6, Canada. .,Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, H3A 0G1, Canada.
| | - Claire Magnussen
- Department of Pharmacology and Therapeutics, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Room 1215, Montreal, QC, H3G 1Y6, Canada. .,Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, H3A 0G1, Canada.
| | - Noosha Yousefpour
- Department of Pharmacology and Therapeutics, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Room 1215, Montreal, QC, H3G 1Y6, Canada. .,Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, H3A 0G1, Canada.
| | - Alfredo Ribeiro-da-Silva
- Department of Pharmacology and Therapeutics, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Room 1215, Montreal, QC, H3G 1Y6, Canada. .,Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, H3A 0G1, Canada. .,Department of Anatomy and Cell Biology, McGill University, Montreal, QC, H3A 0C7, Canada.
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21
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Saeed AW, Pawlowski SA, Ribeiro-da-Silva A. Limited changes in spinal lamina I dorsal horn neurons following the cytotoxic ablation of non-peptidergic C-fibers. Mol Pain 2015; 11:54. [PMID: 26353788 PMCID: PMC4564961 DOI: 10.1186/s12990-015-0060-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Accepted: 08/31/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Non-peptidergic nociceptive neurons are a sub-population of small diameter primary sensory neurons that comprise approximately 50 % of the C fiber population. Together with the peptidergic sub-population, they transmit nociceptive information from the periphery to the superficial dorsal horn of the spinal cord. Despite the numerous studies investigating the role of the non-peptidergic primary afferents, their role in normal nociception and in pain remains poorly understood. Our lab has previously demonstrated that, in rat models of neuropathic and inflammatory pain, there is a de novo expression of substance P receptors (NK-1r) by lamina I pyramidal projection neurons, a neuronal population that normally does not express these receptors. RESULTS In this study, we used a ribosomal toxin, saporin, conjugated to the lectin IB4 to selectively ablate the non-peptidergic nociceptive C fibers, to investigate if the loss of these fibers was enough to induce a change in NK-1r expression by lamina I projection neurons. IB4-saporin treatment led to the permanent ablation of the IB4-positive afferents but also to a small non-significant reduction in CGRP-positive afferents. An overall increase in immunoreactivity for the NK-1r was observed in lamina I projection neurons, however, the lack of non-peptidergic afferents did not increase the number of lamina I pyramidal projection neurons immunoreactive for the receptor. CONCLUSIONS Our results demonstrate that the deletion of the non-peptidergic afferents, at the L4-L5 spinal levels, is not sufficient to trigger the de novo expression of NK-1r by projection pyramidal neurons but increases the expression of NK-1r in fusiform and multipolar projection neurons. Furthermore, our data suggest that a neuropathic component is essential to trigger the expression of NK-1r by pyramidal neurons.
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Affiliation(s)
- Abeer W Saeed
- Department of Pharmacology and Therapeutics, McGill University, 3655 Promenade Sir-William-Osler, Montreal, QC, H3G 1Y6, Canada. .,Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, H3A 0G1, Canada.
| | - Sophie A Pawlowski
- Department of Pharmacology and Therapeutics, McGill University, 3655 Promenade Sir-William-Osler, Montreal, QC, H3G 1Y6, Canada. .,Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, H3A 0G1, Canada.
| | - Alfredo Ribeiro-da-Silva
- Department of Pharmacology and Therapeutics, McGill University, 3655 Promenade Sir-William-Osler, Montreal, QC, H3G 1Y6, Canada. .,Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, H3A 0G1, Canada. .,Department of Anatomy and Cell Biology, McGill University, Montreal, QC, H3A 0C7, Canada.
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22
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Magnussen C, Hung SP, Ribeiro-da-Silva A. Novel expression pattern of neuropeptide Y immunoreactivity in the peripheral nervous system in a rat model of neuropathic pain. Mol Pain 2015; 11:31. [PMID: 26012590 PMCID: PMC4449610 DOI: 10.1186/s12990-015-0029-y] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Accepted: 05/20/2015] [Indexed: 12/26/2022] Open
Abstract
Background Neuropeptide Y (NPY) has been implicated in the modulation of pain. Under normal conditions, NPY is found in interneurons in the dorsal horn of the spinal cord and in sympathetic postganglionic neurons but is absent from the cell bodies of sensory neurons. Following peripheral nerve injury NPY is dramatically upregulated in the sensory ganglia. How NPY expression is altered in the peripheral nervous system, distal to a site of nerve lesion, remains unknown. To address this question, NPY expression was investigated using immunohistochemistry at the level of the trigeminal ganglion, the mental nerve and in the skin of the lower lip in relation to markers of sensory and sympathetic fibers in a rat model of trigeminal neuropathic pain. Results At 2 and 6 weeks after chronic constriction injury (CCI) of the mental nerve, de novo expression of NPY was seen in the trigeminal ganglia, in axons in the mental nerve, and in fibers in the upper dermis of the skin. In lesioned animals, NPY immunoreactivity was expressed primarily by large diameter mental nerve sensory neurons retrogradely labelled with Fluorogold. Many axons transported this de novo NPY to the periphery as NPY-immunoreactive (IR) fibers were seen in the mental nerve both proximal and distal to the CCI. Some of these NPY-IR axons co-expressed Neurofilament 200 (NF200), a marker for myelinated sensory fibers, and occasionally colocalization was seen in their terminals in the skin. Peptidergic and non-peptidergic C fibers expressing calcitonin gene-related peptide (CGRP) or binding isolectin B4 (IB4), respectively, never expressed NPY. CCI caused a significant de novo sprouting of sympathetic fibers into the upper dermis of the skin, and most, but not all of these fibers, expressed NPY. Conclusions This is the first study to provide a comprehensive description of changes in NPY expression in the periphery after nerve injury. Novel expression of NPY in the skin comes mostly from sprouted sympathetic fibers. This information is fundamental in order to understand where endogenous NPY is expressed, and how it might be acting to modulate pain in the periphery.
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Affiliation(s)
- Claire Magnussen
- Department of Pharmacology and Therapeutics, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Room 1215, Montreal, Quebec, H3G 1Y6, Canada. .,Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, H3A 0G1, Canada.
| | - Shih-Ping Hung
- Department of Pharmacology and Therapeutics, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Room 1215, Montreal, Quebec, H3G 1Y6, Canada.
| | - Alfredo Ribeiro-da-Silva
- Department of Pharmacology and Therapeutics, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Room 1215, Montreal, Quebec, H3G 1Y6, Canada. .,Alan Edwards Centre for Research on Pain, McGill University, Montreal, Quebec, H3A 0G1, Canada. .,Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, H3A 0C7, Canada.
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23
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Abstract
The traditional view of G protein-coupled receptors (GPCRs) being inactivated upon their internalization has been repeatedly challenged in recent years. GPCRs, in addition to forming the largest family of cell surface receptors, can also be found on intracellular membranes such as nuclear membranes. Since the first experimental evidence of GPCRs at the nucleus in the early 1990s, approximately 30 different GPCRs have been localized at the nucleus by independent research groups, including ours. In this chapter, we describe several techniques commonly used for immuno-detection of nuclear GPCRs focusing on subcellular fractionation of proteins based on their localization and transmission electron microscopy (TEM) using primary cultured cells as well as tissue sections. We also describe the use of confocal microscopy to study nuclear calcium currents, which can further affect downstream events such as gene transcription, nuclear envelope breakdown, or its reconstruction and nucleocytoplasmic protein transport.
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Affiliation(s)
- Vikrant K Bhosle
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
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24
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Joyal JS, Nim S, Zhu T, Sitaras N, Rivera JC, Shao Z, Sapieha P, Hamel D, Sanchez M, Zaniolo K, St-Louis M, Ouellette J, Montoya-Zavala M, Zabeida A, Picard E, Hardy P, Bhosle V, Varma DR, Gobeil F, Beauséjour C, Boileau C, Klein W, Hollenberg M, Ribeiro-da-Silva A, Andelfinger G, Chemtob S. Subcellular localization of coagulation factor II receptor-like 1 in neurons governs angiogenesis. Nat Med 2014; 20:1165-73. [PMID: 25216639 DOI: 10.1038/nm.3669] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Accepted: 07/23/2014] [Indexed: 02/07/2023]
Abstract
Neurons have an important role in retinal vascular development. Here we show that the G protein-coupled receptor (GPCR) coagulation factor II receptor-like 1 (F2rl1, previously known as Par2) is abundant in retinal ganglion cells and is associated with new blood vessel formation during retinal development and in ischemic retinopathy. After stimulation, F2rl1 in retinal ganglion cells translocates from the plasma membrane to the cell nucleus using a microtubule-dependent shuttle that requires sorting nexin 11 (Snx11). At the nucleus, F2rl1 facilitates recruitment of the transcription factor Sp1 to trigger Vegfa expression and, in turn, neovascularization. In contrast, classical plasma membrane activation of F2rl1 leads to the expression of distinct genes, including Ang1, that are involved in vessel maturation. Mutant versions of F2rl1 that prevent nuclear relocalization but not plasma membrane activation interfere with Vegfa but not Ang1 expression. Complementary angiogenic factors are therefore regulated by the subcellular localization of a receptor (F2rl1) that governs angiogenesis. These findings may have implications for the selectivity of drug actions based on the subcellular distribution of their targets.
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Affiliation(s)
- Jean-Sébastien Joyal
- 1] Department of Pediatrics, Centre Hospitalier Universitaire (CHU) Sainte-Justine Research Center, Université de Montréal, Montréal, Québec, Canada. [2] Department of Ophthalmology, Hôpital Maisonneuve-Rosemont Research Center, Université de Montreal, Montreal, Québec, Canada. [3] Department of Pharmacology, Université de Montréal, Montréal, Québec, Canada. [4] Department of Pharmacology and Therapeutics, McGill University, Montréal, Québec, Canada. [5]
| | - Satra Nim
- 1] Department of Pharmacology and Therapeutics, McGill University, Montréal, Québec, Canada. [2]
| | - Tang Zhu
- 1] Department of Pediatrics, Centre Hospitalier Universitaire (CHU) Sainte-Justine Research Center, Université de Montréal, Montréal, Québec, Canada. [2]
| | - Nicholas Sitaras
- 1] Department of Ophthalmology, Hôpital Maisonneuve-Rosemont Research Center, Université de Montreal, Montreal, Québec, Canada. [2] Department of Pharmacology, Université de Montréal, Montréal, Québec, Canada
| | - José Carlos Rivera
- 1] Department of Pediatrics, Centre Hospitalier Universitaire (CHU) Sainte-Justine Research Center, Université de Montréal, Montréal, Québec, Canada. [2] Department of Ophthalmology, Hôpital Maisonneuve-Rosemont Research Center, Université de Montreal, Montreal, Québec, Canada
| | - Zhuo Shao
- Department of Pharmacology and Therapeutics, McGill University, Montréal, Québec, Canada
| | - Przemyslaw Sapieha
- Department of Ophthalmology, Hôpital Maisonneuve-Rosemont Research Center, Université de Montreal, Montreal, Québec, Canada
| | - David Hamel
- Department of Pharmacology, Université de Montréal, Montréal, Québec, Canada
| | - Melanie Sanchez
- Department of Pharmacology and Therapeutics, McGill University, Montréal, Québec, Canada
| | - Karine Zaniolo
- Department of Pediatrics, Centre Hospitalier Universitaire (CHU) Sainte-Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Manon St-Louis
- Department of Pharmacology and Therapeutics, McGill University, Montréal, Québec, Canada
| | - Johanne Ouellette
- Department of Pharmacology and Therapeutics, McGill University, Montréal, Québec, Canada
| | | | - Alexandra Zabeida
- Department of Pediatrics, Centre Hospitalier Universitaire (CHU) Sainte-Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Emilie Picard
- Department of Pediatrics, Centre Hospitalier Universitaire (CHU) Sainte-Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Pierre Hardy
- Department of Pediatrics, Centre Hospitalier Universitaire (CHU) Sainte-Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Vikrant Bhosle
- Department of Pharmacology and Therapeutics, McGill University, Montréal, Québec, Canada
| | - Daya R Varma
- Department of Pharmacology and Therapeutics, McGill University, Montréal, Québec, Canada
| | - Fernand Gobeil
- Department of Pharmacology, Sherbrooke University, Sherbrooke, Quebec, Canada
| | | | - Christelle Boileau
- Department of Pharmacology, Université de Montréal, Montréal, Québec, Canada
| | - William Klein
- Department of Systems Biology, University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Morley Hollenberg
- Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | | | - Gregor Andelfinger
- Department of Cardiology, CHU Sainte-Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Sylvain Chemtob
- 1] Department of Pediatrics, Centre Hospitalier Universitaire (CHU) Sainte-Justine Research Center, Université de Montréal, Montréal, Québec, Canada. [2] Department of Ophthalmology, Hôpital Maisonneuve-Rosemont Research Center, Université de Montreal, Montreal, Québec, Canada. [3] Department of Pharmacology, Université de Montréal, Montréal, Québec, Canada. [4] Department of Pharmacology and Therapeutics, McGill University, Montréal, Québec, Canada
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25
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Lorenzo LE, Magnussen C, Bailey AL, St Louis M, De Koninck Y, Ribeiro-da-Silva A. Spatial and temporal pattern of changes in the number of GAD65-immunoreactive inhibitory terminals in the rat superficial dorsal horn following peripheral nerve injury. Mol Pain 2014; 10:57. [PMID: 25189404 PMCID: PMC4164746 DOI: 10.1186/1744-8069-10-57] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Accepted: 08/26/2014] [Indexed: 01/12/2023] Open
Abstract
Inhibitory interneurons are an important component of dorsal horn circuitry where they serve to modulate spinal nociception. There is now considerable evidence indicating that reduced inhibition in the spinal dorsal horn contributes to neuropathic pain. A loss of these inhibitory neurons after nerve injury is one of the mechanisms being proposed to account for reduced inhibition; however, this remains controversial. This is in part because previous studies have focused on global measurements of inhibitory neurons without assessing the number of inhibitory synapses. To address this, we conducted a quantitative analysis of the spatial and temporal changes in the number of inhibitory terminals, as detected by glutamic acid decarboxylase 65 (GAD65) immunoreactivity, in the superficial dorsal horn of the spinal cord following a chronic constriction injury (CCI) to the sciatic nerve in rats. Isolectin B4 (IB4) labelling was used to define the location within the dorsal horn directly affected by the injury to the peripheral nerve. The density of GAD65 inhibitory terminals was reduced in lamina I (LI) and lamina II (LII) of the spinal cord after injury. The loss of GAD65 terminals was greatest in LII with the highest drop occurring around 3–4 weeks and a partial recovery by 56 days. The time course of changes in the number of GAD65 terminals correlated well with both the loss of IB4 labeling and with the altered thresholds to mechanical and thermal stimuli. Our detailed analysis of GAD65+ inhibitory terminals clearly revealed that nerve injury induced a transient loss of GAD65 immunoreactive terminals and suggests a potential involvement for these alterations in the development and amelioration of pain behaviour.
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Affiliation(s)
| | | | | | | | | | - Alfredo Ribeiro-da-Silva
- Department of Pharmacology and Therapeutics, McGill University, 3655 Promenade Sir-William-Osler, Montreal, Quebec H3G 1Y6, Canada.
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26
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Charrua A, Pinto R, Taylor A, Canelas A, Ribeiro-da-Silva A, Cruz CD, Birder LA, Cruz F. Can the adrenergic system be implicated in the pathophysiology of bladder pain syndrome/interstitial cystitis? A clinical and experimental study. Neurourol Urodyn 2013; 34:489-96. [PMID: 24375689 DOI: 10.1002/nau.22542] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [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: 10/17/2013] [Accepted: 11/29/2013] [Indexed: 12/20/2022]
Abstract
AIMS To evaluate sympathetic system activity in bladder pain syndrome/interstitial cystitis (BPS/IC) patients and to investigate if chronic adrenergic stimulation in intact rats induces BPS/IC-like bladder modifications. METHODS Clinical study--In BPS/IC patients and aged and body mass index matched volunteers TILT test was undertaken and catecholamines were measured in plasma and 24 hr urine samples. Experimental study--Phenylephrine was injected subcutaneously (14 days) to female Wistar rats. Pain behavior, spinal Fos expression, urinary spotting, number of fecal pellets expelled, frequency of reflex bladder contractions, and urothelial height were analyzed. Urothelium permeability was investigated by trypan blue staining. Immunoreactivity against caspase 3 and bax were studied in the urothelium and against alpha-1-adrenoreceptor and TRPV1 in suburothelial nerves. Mast cell number was determined in the sub-urothelium. In rats with lipopolysaccharide-induced cystitis, urinary catecholamines, and Vesicular Monoamine Transporter 2 (VMAT2) expression in bladder nerves were analyzed. RESULTS The TILT test showed an increase of sympathetic activity. Noradrenaline levels in blood at resting conditions and in 24-hr urine samples were higher in BPS/IC patients. Phenylephrine administration increased visceral pain, spinal Fos expression, bladder reflex activity, urinary spotting and the number of expelled fecal pellets. The mucosa showed urothelial thinning and increased immunoreactivity for caspase 3 and bax. Trypan blue staining was only observed in phenylephrine treated animals. Suburothelial nerves co-expressed alpha1 and TRPV1. Mastocytosis was present in the suburothelium. Cystitis increased sympathetic nerve density and urinary noradrenaline levels. CONCLUSIONS Excessive adrenergic stimulation of the bladder may contribute to the pathophysiological mechanisms of BPS/IC.
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Affiliation(s)
- Ana Charrua
- Department of Experimental Biology, Faculty of Medicine, University of Porto, Porto, Portugal.,IBMC - Instituto de Biologia Molecular e Celular, University of Porto, Porto, Portugal.,Department of Renal, Urologic and Infectious Disease, Faculty of Medicine, University of Porto, Porto, Portugal.,Department of Urology, S. João Hospital, Porto, Portugal
| | - Rui Pinto
- IBMC - Instituto de Biologia Molecular e Celular, University of Porto, Porto, Portugal.,Department of Renal, Urologic and Infectious Disease, Faculty of Medicine, University of Porto, Porto, Portugal.,Department of Urology, S. João Hospital, Porto, Portugal
| | - Anna Taylor
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Quebec, Canada
| | - André Canelas
- Department of Experimental Biology, Faculty of Medicine, University of Porto, Porto, Portugal
| | | | - Célia D Cruz
- Department of Experimental Biology, Faculty of Medicine, University of Porto, Porto, Portugal.,IBMC - Instituto de Biologia Molecular e Celular, University of Porto, Porto, Portugal
| | - Lori Ann Birder
- Departments of Medicine and Pharmacology-Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Francisco Cruz
- IBMC - Instituto de Biologia Molecular e Celular, University of Porto, Porto, Portugal.,Department of Renal, Urologic and Infectious Disease, Faculty of Medicine, University of Porto, Porto, Portugal.,Department of Urology, S. João Hospital, Porto, Portugal
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Saeed AW, Ribeiro-da-Silva A. De novo expression of neurokinin-1 receptors by spinoparabrachial lamina I pyramidal neurons following a peripheral nerve lesion. J Comp Neurol 2013; 521:1915-28. [PMID: 23172292 DOI: 10.1002/cne.23267] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2012] [Revised: 09/07/2012] [Accepted: 11/09/2012] [Indexed: 01/07/2023]
Abstract
Lamina I of the spinal dorsal horn is a major site of integration and transmission to higher centers of nociceptive information from the periphery. One important primary afferent population that transmits such information to the spinal cord expresses substance P (SP). These fibers terminate in contact with lamina I projection neurons that express the SP receptor, also known as the neurokinin-1 receptor (NK-1r). Three types of lamina I projection neurons have been described: multipolar, fusiform, and pyramidal. Most neurons of the first two types are thought to be nociceptive and express the NK-1r, whereas most pyramidal neurons are nonnociceptive and do not express the NK-1r. In this immunocytochemical and behavioral study, we induced a neuropathic pain-like condition in the rat by means of a polyethylene cuff placed around in the sciatic nerve. We document that this lesion led to a de novo expression of NK-1r on pyramidal neurons as well as a significant increase in SP-immunoreactive innervation onto these neurons. These phenotypic changes were evident at the time of onset of neuropathic pain-related behavior. Additionally, we show that, after a noxious stimulus (intradermal capsaicin injection), these NK-1r on pyramidal neurons were internalized, providing evidence that these neurons become responsive to peripheral noxious stimulation. We suggest that the changes following nerve lesion in the phenotype and innervation pattern of pyramidal neurons are of significance for neuropathic pain and/or limb temperature regulation.
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Affiliation(s)
- Abeer W Saeed
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Quebec H3G 1Y6, Canada
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Osikowicz M, Longo G, Allard S, Cuello AC, Ribeiro-da-Silva A. Inhibition of endogenous NGF degradation induces mechanical allodynia and thermal hyperalgesia in rats. Mol Pain 2013; 9:37. [PMID: 23889761 PMCID: PMC3737061 DOI: 10.1186/1744-8069-9-37] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Accepted: 07/24/2013] [Indexed: 12/27/2022] Open
Abstract
Background We have previously shown a sprouting of sympathetic fibers into the upper dermis of the skin following subcutaneous injection of complete Freund’s adjuvant (CFA) into the hindpaw. This sprouting correlated with an increase in pain-related sensitivity. We hypothesized that this sprouting and pain-related behavior were caused by an increase in nerve growth factor (NGF) levels. In this study, we investigated whether the inhibition of mature NGF degradation, using a matrix metalloproteinase 2 and 9 (MMP-2/9) inhibitor, was sufficient to reproduce a similar phenotype. Results Behavioral tests performed on male Sprague–Dawley rats at 1, 3, 7 and 14 days after intra-plantar MMP-2/9 inhibitor administration demonstrated that acute and chronic injections of the MMP-2/9 inhibitor induced sensitization, in a dose dependent manner, to mechanical, hot and cold stimuli as measured by von Frey filaments, Hargreaves and acetone tests, respectively. Moreover, the protein levels of mature NGF (mNGF) were increased, whereas the levels and enzymatic activity of matrix metalloproteinase 9 were reduced in the glabrous skin of the hind paw. MMP-2/9 inhibition also led to a robust sprouting of sympathetic fibers into the upper dermis but there were no changes in the density of peptidergic nociceptive afferents. Conclusions These findings indicate that localized MMP-2/9 inhibition provokes a pattern of sensitization and fiber sprouting comparable to that previously obtained following CFA injection. Accordingly, the modulation of endogenous NGF levels should be considered as a potential therapeutic target for the management of inflammatory pain associated with arthritis.
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Osikowicz M, Longo G, Allard S, Cuello AC, Ribeiro-da-Silva A. Correction: Inhibition of Endogenous NGF Degradation Induces Mechanical Allodynia and Thermal Hyperalgesia in Rats. Mol Pain 2013. [PMCID: PMC3874613 DOI: 10.1186/1744-8069-9-55] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- Maria Osikowicz
- Department of Pharmacology and Therapeutics, McGill University, 3655 Prom Sir-William-Osler, Montreal, QC H3G 1Y6, Canada
| | - Geraldine Longo
- Department of Pharmacology and Therapeutics, McGill University, 3655 Prom Sir-William-Osler, Montreal, QC H3G 1Y6, Canada
| | - Simon Allard
- Department of Pharmacology and Therapeutics, McGill University, 3655 Prom Sir-William-Osler, Montreal, QC H3G 1Y6, Canada
| | - A Claudio Cuello
- Department of Pharmacology and Therapeutics, McGill University, 3655 Prom Sir-William-Osler, Montreal, QC H3G 1Y6, Canada
- Department of Anatomy and Cell Biology, McGill University, Montreal, QC H3A 2B2, Canada
- Department of Neurology and Neurosurgery, McGill University, Montreal, QC H3A 2B4, Canada
| | - Alfredo Ribeiro-da-Silva
- Department of Pharmacology and Therapeutics, McGill University, 3655 Prom Sir-William-Osler, Montreal, QC H3G 1Y6, Canada
- Department of Anatomy and Cell Biology, McGill University, Montreal, QC H3A 2B2, Canada
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Mo G, Peleshok JC, Cao CQ, Ribeiro-da-Silva A, Séguéla P. Control of P2X3 channel function by metabotropic P2Y2 utp receptors in primary sensory neurons. Mol Pharmacol 2012; 83:640-7. [PMID: 23249537 DOI: 10.1124/mol.112.082099] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Purinergic signaling contributes significantly to pain mechanisms, and the nociceptor-specific P2X3 ATP receptor channel is considered a target in pain therapeutics. Recent findings suggesting the coexpression of metabotropic P2Y receptors with P2X3 implies that ATP release triggers the activation of both ionotropic and metabotropic purinoceptors, with strong potential for functional interaction. Modulation of native P2X3 function by P2Y receptor activation was investigated in rat dorsal root ganglia (DRG) neurons using whole cell patch-clamp recordings. Application of the selective P2Y receptor agonist UTP decreased peak amplitudes of α,β-meATP-evoked homomeric P2X3-mediated currents, but had no effect on heteromeric P2X2/3-mediated currents. Treatment with phospholipase C inhibitor U73122 significantly reversed P2X3 current inhibition induced by UTP-sensitive P2Y receptor activation. We previously reported the modulation of P2X receptors by phospholipids in DRG neurons and injection of exogenous phosphatidylinositol-4,5-bisphosphate (PIP(2)) fully reverses UTP-mediated regulation of P2X3 channel activity. Pharmacological as well as functional screening of P2Y receptor subtypes indicates the predominant involvement of P2Y2 receptor in P2X3 inhibition, and immunolocalization confirms a significant cellular coexpression of P2X3 and P2Y2 in rat DRG neurons. In summary, the function of P2X3 ATP receptor can be inhibited by P2Y2-mediated depletion of PIP(2). We propose that expression of P2Y2 purinoceptor in nociceptive sensory neurons provides an homeostatic mechanism to prevent excessive ATP signaling through P2X3 receptor channels.
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Affiliation(s)
- Gary Mo
- Alan Edwards Research Centre on Pain, Montreal, Quebec, Canada
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Saeed AW, Ribeiro-da-Silva A. Non-peptidergic primary afferents are presynaptic to neurokinin-1 receptor immunoreactive lamina I projection neurons in rat spinal cord. Mol Pain 2012; 8:64. [PMID: 22963197 PMCID: PMC3495683 DOI: 10.1186/1744-8069-8-64] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2012] [Accepted: 09/06/2012] [Indexed: 11/10/2022] Open
Abstract
Background Pain-related (nociceptive) information is carried from the periphery to the dorsal horn of the spinal cord mostly by two populations of small diameter primary afferents, the peptidergic and the non-peptidergic. The peptidergic population expresses neuropeptides, such as substance P and calcitonin gene-related peptide, while the non-peptidergic fibers are devoid of neuropeptides, express the purinergic receptor P2X3, and bind the isolectin B4 (IB4). Although it has been known for some time that in rat the peptidergic afferents terminate mostly in lamina I and outer lamina II and non-peptidergic afferents in inner lamina II, the extent of the termination of the latter population in lamina I was never investigated as it was considered as very minor. Because our preliminary evidence suggested otherwise, we decided to re-examine the termination of non-peptidergic afferents in lamina I, in particular with regards to their innervation of projection neurons expressing substance P receptors (NK-1r). We used retrograde labeling of neurons from the parabrachial nucleus combined with lectin IB4 binding and immunocytochemistry. Samples were examined by confocal and electron microscopy. Results By confocal microscopy, we studied the termination of non-peptidergic afferents in lamina I using IB4 binding and P2X3 immunoreactivity as markers, in relation to CGRP immunoreactivy, a marker of peptidergic afferents. The number of IB4 or P2X3-labeled fibers in lamina I was higher than previously thought, although they were less abundant than CGRP-labeled afferents. There were very few fibers double-labeled for CGRP and either P2X3 or IB4. We found a considerable number of IB4-positive fiber varicosities in close apposition to NK-1r-positive lamina I projection neurons, which were distinct from peptidergic varicosities. Furthermore, we confirmed at the ultrastructural level that there were bona fide synapses between P2X3-immunoreactive non-peptidergic boutons and neurokinin-1 receptor-positive lamina I dendrites. Conclusions These results indicate the presence of direct innervation by non-peptidergic nociceptive afferents of lamina I projection neurons expressing NK-1r. Further investigations are needed to better understand the role of these connections in physiological conditions and chronic pain states.
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Affiliation(s)
- Abeer W Saeed
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Quebec H3G 1Y6, Canada
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Farmer MA, Taylor AM, Bailey AL, Tuttle AH, MacIntyre LC, Milagrosa ZE, Crissman HP, Bennett GJ, Ribeiro-da-Silva A, Binik YM, Mogil JS. Repeated vulvovaginal fungal infections cause persistent pain in a mouse model of vulvodynia. Sci Transl Med 2012; 3:101ra91. [PMID: 21937756 DOI: 10.1126/scitranslmed.3002613] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Provoked vestibulodynia, the most common form of vulvodynia (unexplained pain of the vulva), is a prevalent, idiopathic pain disorder associated with a history of recurrent candidiasis (yeast infections). It is characterized by vulvar allodynia (painful hypersensitivity to touch) and hyperinnervation. We tested whether repeated, localized exposure of the vulva to a common fungal pathogen can lead to the development of chronic pain. A subset of female mice subjected to recurrent Candida albicans infection developed mechanical allodynia localized to the vulva. The mice with allodynia also exhibited hyperinnervation with peptidergic nociceptor and sympathetic fibers (as indicated by increased protein gene product 9.5, calcitonin gene-related peptide, and vesicular monoamine transporter 2 immunoreactivity in the vaginal epithelium). Long-lasting behavioral allodynia in a subset of mice was also observed after a single, extended Candida infection, as well as after repeated vulvar (but not hind paw) inflammation induced with zymosan, a mixture of fungal antigens. The hypersensitivity and hyperinnervation were both present at least 3 weeks after the resolution of infection and inflammation. Our data show that infection can cause persistent pain long after its resolution and that recurrent yeast infection replicates important features of human provoked vulvodynia in the mouse.
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Affiliation(s)
- Melissa A Farmer
- Department of Psychology, McGill University, 1205 Doctor Penfield Avenue, Montreal, Quebec H3A 1B1, Canada
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Peleshok JC, Ribeiro-da-Silva A. Neurotrophic factor changes in the rat thick skin following chronic constriction injury of the sciatic nerve. Mol Pain 2012; 8:1. [PMID: 22233577 PMCID: PMC3269365 DOI: 10.1186/1744-8069-8-1] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2011] [Accepted: 01/10/2012] [Indexed: 01/16/2023] Open
Abstract
BACKGROUND Cutaneous peripheral neuropathies have been associated with changes of the sensory fiber innervation in the dermis and epidermis. These changes are mediated in part by the increase in local expression of trophic factors. Increase in target tissue nerve growth factor has been implicated in the promotion of peptidergic afferent and sympathetic efferent sprouting following nerve injury. The primary source of nerve growth factor is cells found in the target tissue, namely the skin. Recent evidence regarding the release and extracellular maturation of nerve growth factor indicate that it is produced in its precursor form and matured in the extracellular space. It is our hypothesis that the precursor form of nerve growth factor should be detectable in those cell types producing it. To date, limitations in available immunohistochemical tools have restricted efforts in obtaining an accurate distribution of nerve growth factor in the skin of naïve animals and those with neuropathic pain lesions. It is the objective of this study to delineate the distribution of the precursor form of nerve growth factor to those cell types expressing it, as well as to describe its distribution with respect to those nerve fibers responsive to it. RESULTS We observed a decrease in peptidergic fiber innervation at 1 week after the application of a chronic constriction injury (CCI) to the sciatic nerve, followed by a recovery, correlating with TrkA protein levels. ProNGF expression in CCI animals was significantly higher than in sham-operated controls from 1-4 weeks post-CCI. ProNGF immunoreactivity was increased in mast cells at 1 week post-CCI and, at later time points, in keratinocytes. P75 expression within the dermis and epidermis was significantly higher in CCI-operated animals than in controls and these changes were localized to neuronal and non-neuronal cell populations using specific markers for each. CONCLUSIONS We describe proNGF expression by non-neuronal cells over time after nerve injury as well as the association of NGF-responsive fibers to proNGF-expressing target tissues. ProNGF expression increases following nerve injury in those cell types previously suggested to express it.
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Affiliation(s)
- Jennifer C Peleshok
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Quebec H3G 1Y6, Canada
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Almarestani L, Fitzcharles MA, Bennett GJ, Ribeiro-da-Silva A. Imaging studies in Freund's complete adjuvant model of regional polyarthritis, a model suitable for the study of pain mechanisms, in the rat. ACTA ACUST UNITED AC 2011; 63:1573-81. [PMID: 21337537 DOI: 10.1002/art.30303] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
OBJECTIVE In view of the extensive distribution in the spinal cord of primary afferent nociceptive nerve fibers from the rat hind paw, a model of regional inflammation would be useful in the study of arthritis pain. However, the subcutaneous intraplantar injection of a single low dose of Freund's complete adjuvant (CFA) has been used mostly as an inflammation model. We undertook this study to characterize this model by means of conventional radiography, microfocal computed tomography, and bone densitometry and by examining changes in pain-related behavior. METHODS Male rats were injected unilaterally with CFA or saline subcutaneously in the hind paw and killed 7, 15, and 30 days after injection. Pain-related behavior was studied using the Hargreaves, von Frey, and acetone tests. RESULTS CFA-injected animals developed soft tissue inflammation and polyarthritis restricted to the joints of the injected hind paw. No signs of joint involvement were observed 7 days after CFA injection. On day 15 after CFA injection, there was widening of joint space indicative of joint effusion. By day 30 after CFA injection, there was evidence of joint damage with joint space narrowing, erosions, osteophyte formation, and joint deformity. There were no changes contralaterally or in saline-injected rats. Mechanical hyperalgesia and cold allodynia were present in the affected hind paw from day 1 through day 30. CONCLUSION Signs of arthritis were strictly unilateral and started only 2 weeks after injection. Since the affected area has a broad representation in the spinal cord, this model has advantages over monarthritis models for the study of plastic changes in the dorsal horn of the spinal cord.
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Affiliation(s)
- Lina Almarestani
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Quebec, Canada
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Taylor AM, Ribeiro-da-Silva A. GDNF levels in the lower lip skin in a rat model of trigeminal neuropathic pain: Implications for nonpeptidergic fiber reinnervation and parasympathetic sprouting. Pain 2011; 152:1502-1510. [DOI: 10.1016/j.pain.2011.02.035] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2010] [Revised: 02/04/2011] [Accepted: 02/14/2011] [Indexed: 12/31/2022]
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Charrua A, Pinto R, Taylor A, Barros S, Ribeiro-da-Silva A, Cruz CD, Avelino A, Cruz F. 813 INCREASED SYMPATHETIC ACTIVITY ENHANCES BLADDER HYPERACTIVITY AND TRIGGERS BLADDER PAIN. J Urol 2011. [DOI: 10.1016/j.juro.2011.02.631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Peleshok JC, Ribeiro-da-Silva A. Delayed reinnervation by nonpeptidergic nociceptive afferents of the glabrous skin of the rat hindpaw in a neuropathic pain model. J Comp Neurol 2010; 519:49-63. [DOI: 10.1002/cne.22500] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Lee S, Zhao YQ, Ribeiro-da-Silva A, Zhang J. Distinctive response of CNS glial cells in oro-facial pain associated with injury, infection and inflammation. Mol Pain 2010; 6:79. [PMID: 21067602 PMCID: PMC2992508 DOI: 10.1186/1744-8069-6-79] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2010] [Accepted: 11/10/2010] [Indexed: 11/10/2022] Open
Abstract
Oro-facial pain following injury and infection is frequently observed in dental clinics. While neuropathic pain evoked by injury associated with nerve lesion has an involvement of glia/immune cells, inflammatory hyperalgesia has an exaggerated sensitization mediated by local and circulating immune mediators. To better understand the contribution of central nervous system (CNS) glial cells in these different pathological conditions, in this study we sought to characterize functional phenotypes of glial cells in response to trigeminal nerve injury (loose ligation of the mental branch), infection (subcutaneous injection of lipopolysaccharide--LPS) and to sterile inflammation (subcutaneous injection of complete Freund's adjuvant--CFA) on the lower lip. Each of the three insults triggered a specific pattern of mechanical allodynia. In parallel with changes in sensory response, CNS glial cells reacted distinctively to the challenges. Following ligation of the mental nerve, both microglia and astrocytes in the trigeminal nuclear complex were highly activated, more prominent in the principal sensory nucleus (Pr5) and subnucleus caudalis (Sp5C) area. Microglial response was initiated early (days 3-14), followed by delayed astrocytes activation (days 7-28). Although the temporal profile of microglial and astrocyte reaction corresponded respectively to the initiation and chronic stage of neuropathic pain, these activated glial cells exhibited a low profile of cytokine expression. Local injection of LPS in the lower lip skin also triggered a microglial reaction in the brain, which started in the circumventricular organs (CVOs) at 5 hours post-injection and diffused progressively into the brain parenchyma at 48 hours. This LPS-induced microglial reaction was accompanied by a robust induction of IκB-α mRNA and pro-inflammatory cytokines within the CVOs. However, LPS induced microglial activation did not specifically occur along the pain signaling pathway. In contrast, CFA injection led to minor microglial morphological changes and an induction of IκB-α mRNA in the CVO regions; a significant increase in IL-1β and IL-6 mRNA started only at 48 hours post-injection, when the induced pain-related behavior started to resolve. Our detailed analysis of CNS glial response clearly revealed that both nerve injury and oro-facial infection/inflammation induced CNS glial activation, but in a completely different pattern, which suggests a remarkable plasticity of glial cells in response to dynamic changes in their microenvironment and different potential involvement of this non-neuronal cell population in pathological pain development.
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Affiliation(s)
- SeungHwan Lee
- The Alan Edwards Centre for Research on Pain, McGill University, 740, Dr. Penfield Ave. Montreal, Quebec, H3A 2B2, Canada
- Faculty of Dentistry; McGill University, Quebec, Canada
| | - Yuan Qing Zhao
- The Alan Edwards Centre for Research on Pain, McGill University, 740, Dr. Penfield Ave. Montreal, Quebec, H3A 2B2, Canada
- Faculty of Dentistry; McGill University, Quebec, Canada
| | - Alfredo Ribeiro-da-Silva
- The Alan Edwards Centre for Research on Pain, McGill University, 740, Dr. Penfield Ave. Montreal, Quebec, H3A 2B2, Canada
- Department of Pharmacology, Faculty of Medicine, McGill University, Quebec, Canada
| | - Ji Zhang
- The Alan Edwards Centre for Research on Pain, McGill University, 740, Dr. Penfield Ave. Montreal, Quebec, H3A 2B2, Canada
- Faculty of Dentistry; McGill University, Quebec, Canada
- Department of Neurology and Neurosurgery, Faculty of Medicine, McGill University, Quebec, Canada
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Allard S, Gosein V, Cuello AC, Ribeiro-da-Silva A. Changes with aging in the dopaminergic and noradrenergic innervation of rat neocortex. Neurobiol Aging 2010; 32:2244-53. [PMID: 20096955 DOI: 10.1016/j.neurobiolaging.2009.12.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2009] [Revised: 12/09/2009] [Accepted: 12/23/2009] [Indexed: 10/19/2022]
Abstract
In normal aging, the mammalian cortex undergoes significant remodeling. Although neuromodulation by dopamine and noradrenaline in the cortex is known to be important for proper cognitive function, little is known on how cortical noradrenergic and dopaminergic presynaptic boutons are affected in normal aging. Using rats we investigated whether these two neurotransmitter systems undergo structural reorganization in aging, and if these changes correlated with cognitive loss. Young and aged rats were tested for cognitive performance using the Morris water maze. Following the behavioral characterization, the animals were sacrificed and the cortical tissue was processed for immunofluorescence using antibodies directed against tyrosine hydroxylase (TH) and dopamine beta-hydroxylase (DBH) to detect and discriminate noradrenergic and dopaminergic varicosities. We observed a significant increase in dopaminergic varicosities in lamina V of the anterior cingulate cortex (ACC) of aged cognitively unimpaired rats when compared to young and aged-impaired animals. In laminae II and III of the ACC, we observed a significant decrease of dopaminergic varicosities in aged-impaired animals when compared to young or aged cognitively unimpaired animals. Changes in noradrenergic varicosities never reached statistical significance in any group or brain region. The data suggests that the remodeling of mesocortical dopaminergic fibers may participate in age-associated cognitive decline.
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Affiliation(s)
- Simon Allard
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Quebec H3G 1Y6, Canada
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Cordero-Erausquin M, Allard S, Dolique T, Bachand K, Ribeiro-da-Silva A, De Koninck Y. Dorsal horn neurons presynaptic to lamina I spinoparabrachial neurons revealed by transynaptic labeling. J Comp Neurol 2009; 517:601-15. [DOI: 10.1002/cne.22179] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Taylor AM, Peleshok JC, Ribeiro-da-Silva A. Distribution of P2X3-immunoreactive fibers in hairy and glabrous skin of the rat. J Comp Neurol 2009; 514:555-66. [DOI: 10.1002/cne.22048] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Labrakakis C, Lorenzo LE, Bories C, Ribeiro-da-Silva A, De Koninck Y. Inhibitory coupling between inhibitory interneurons in the spinal cord dorsal horn. Mol Pain 2009; 5:24. [PMID: 19432997 PMCID: PMC2689203 DOI: 10.1186/1744-8069-5-24] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2009] [Accepted: 05/12/2009] [Indexed: 11/10/2022] Open
Abstract
Local inhibitory interneurons in the dorsal horn play an important role in the control of excitability at the segmental level and thus determine how nociceptive information is relayed to higher structures. Regulation of inhibitory interneuron activity may therefore have critical consequences on pain perception. Indeed, disinhibition of dorsal horn neuronal networks disrupts the balance between excitation and inhibition and is believed to be a key mechanism underlying different forms of pain hypersensitivity and chronic pain states. In this context, studying the source and the synaptic properties of the inhibitory inputs that the inhibitory interneurons receive is important in order to predict the impact of drug action at the network level. To address this, we studied inhibitory synaptic transmission in lamina II inhibitory interneurons identified under visual guidance in spinal slices taken from transgenic mice expressing enhanced green fluorescent protein (EGFP) under the control of the GAD promoter. The majority of these cells fired tonically to a long depolarizing current pulse. Monosynaptically evoked inhibitory postsynaptic currents (eIPSCs) in these cells were mediated by both GABAA and glycine receptors. Consistent with this, both GABAA and glycine receptor-mediated miniature IPSCs were recorded in all of the cells. These inhibitory inputs originated at least in part from local lamina II interneurons as verified by simultaneous recordings from pairs of EGFP+ cells. These synapses appeared to have low release probability and displayed potentiation and asynchronous release upon repeated activation. In summary, we report on a previously unexamined component of the dorsal horn circuitry that likely constitutes an essential element of the fine tuning of nociception.
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Affiliation(s)
- Charalampos Labrakakis
- Unité de neurobiologie cellulaire, Centre de Recherche Université Laval Robert-Giffard, Québec, Québec, Canada. -
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Riedl MS, Schnell SA, Overland AC, Chabot-Doré AJ, Taylor AM, Ribeiro-da-Silva A, Elde RP, Wilcox GL, Stone LS. Coexpression of alpha 2A-adrenergic and delta-opioid receptors in substance P-containing terminals in rat dorsal horn. J Comp Neurol 2009; 513:385-98. [PMID: 19180644 DOI: 10.1002/cne.21982] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Agonists acting at alpha(2)-adrenergic and opioid receptors (alpha(2)ARs and ORs, respectively) inhibit pain transmission in the spinal cord. When coadministered, agonists activating these receptors interact in a synergistic manner. Although the existence of alpha(2)AR/OR synergy has been well characterized, its mechanism remains poorly understood. The formation of heterooligomers has been proposed as a molecular basis for interactions between neuronal G-protein-coupled receptors. The relevance of heterooligomer formation to spinal analgesic synergy requires demonstration of the expression of both receptors within the same neuron as well as the localization of both receptors in the same neuronal compartment. We used immunohistochemistry to investigate the spatial relationship between alpha(2)ARs and ORs in the rat spinal cord to determine whether coexpression could be demonstrated between these receptors. We observed extensive colocalization between alpha(2A)-adrenergic and delta-opioid receptors (DOP) on substance P (SP)-immunoreactive (-ir) varicosities in the superficial dorsal horn of the spinal cord and in peripheral nerve terminals in the skin. alpha(2A)AR- and DOP-ir elements were colocalized in subcellular structures of 0.5 mum or less in diameter in isolated nerve terminals. Furthermore, coincubation of isolated synaptosomes with alpha(2)AR and DOP agonists resulted in a greater-than-additive increase in the inhibition of K(+)-stimulated neuropeptide release. These findings suggest that coexpression of the synergistic receptor pair alpha(2A)AR-DOP on primary afferent nociceptive fibers may represent an anatomical substrate for analgesic synergy, perhaps as a result of protein-protein interactions such as heterooligomerization.
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Affiliation(s)
- Maureen S Riedl
- Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota 55455, USA
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Almarestani L, Waters SM, Krause JE, Bennett GJ, Ribeiro-da-Silva A. De novo expression of the neurokinin 1 receptor in spinal lamina I pyramidal neurons in polyarthritis. J Comp Neurol 2009; 514:284-95. [PMID: 19296480 DOI: 10.1002/cne.22024] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Spinal lamina I (LI) neurons play a major role in the transmission and integration of pain-related information that is relayed to higher centers. Alterations in the excitability of these neurons influence chronic pain development, and expression of the neurokinin 1 receptor (NK-1r) is thought to play a major role in such changes. Novel expression of NK-1r may underlie hyperexcitability in new populations of LI neurons. LI projection neurons can be classified morphologically into fusiform, pyramidal, and multipolar cells, differing in their functional properties, with the pyramidal type being nonnociceptive. In agreement with this, we have shown that spinoparabrachial pyramidal neurons seldom express NK-1r, in contrast with the other two cell types. In this study we investigated in the rat the long-term changes in NK-1r expression by spinoparabrachial LI neurons following the unilateral injection in the hindpaw plantar surface of complete Freund's adjuvant (CFA). Cholera toxin subunit B (CTb) was injected unilaterally into the parabrachial nucleus. Our results revealed that, ipsilaterally, pyramidal neurons were seldom immunoreactive for NK-1r both in saline-injected and in CFA-injected rats, up to 10 days post-CFA. However, a considerable number of pyramidal cells were immunoreactive for NK-1r at 15, 21, and 30 days post-CFA. Our data raise the possibility -- which needs to be confirmed by electrophysiology -- that most LI projection neurons of the pyramidal type are likely nonnociceptive in naive animals but might become nociceptive following the development of arthritis.
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Affiliation(s)
- L Almarestani
- Department of Pharmacology & Therapeutics, McGill University, Montreal, Quebec, Canada
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Abstract
Pain is a major symptom associated with chronic inflammation. In previous work from our laboratory, we have shown that in animal models of neuropathic pain there is a sprouting of sympathetic fibers into the upper dermis, a territory normally devoid of them. However, it is not known whether such sympathetic spouting, which is likely trophic factor mediated, also occurs in chronic inflammation and arthritis. In the present study, we used a rat model of chronic inflammation in which a small single dose of complete Freund's adjuvant (CFA) was injected subcutaneously, unilaterally, into the plantar surface of the hindpaw. This led to a localized long-term skin inflammation and arthritis in all joints of the hindpaw. Animals were perfused with histological fixatives at 1, 2, 3 or 4 weeks after the injection. Experimental animals treated with CFA were compared to saline-injected animals. We then investigated the changes in the pattern of peripheral innervation of the peptidergic nociceptors and sympathetic fibers in rat glabrous hindpaw skin. Antibodies directed towards calcitonin gene-related peptide (CGRP) and dopamine beta-hydroxylase (DBH) were used for the staining of peptidergic and sympathetic fibers, respectively. Immunofluorescence was then used to analyze the different nerve fiber populations of the upper dermis. At 4 weeks following CFA treatment, DBH-immunoreactive (IR) fibers were found to sprout into the upper dermis, in a pattern similar to the one we had observed in animals with a chronic constriction injury of the sciatic nerve in a previous publication. There was also a significant increase in the density of CGRP-IR fibers in the upper dermis in CFA treated animals at 2, 3 and 4 weeks post-injection. The increased peptidergic fiber innervation and the ectopic autonomic fibers found in the upper dermis may have a role in the pain-related behavior displayed by these animals.
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Affiliation(s)
- Lina Almarestani
- Department of Pharmacology & Therapeutics, McGill University, Montreal, Quebec, Canada.
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Lorenzo LE, Ramien M, St Louis M, De Koninck Y, Ribeiro-da-Silva A. Postnatal changes in the Rexed lamination and markers of nociceptive afferents in the superficial dorsal horn of the rat. J Comp Neurol 2008; 508:592-604. [PMID: 18383051 DOI: 10.1002/cne.21691] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
In this study, we investigated postnatal changes in Rexed's laminae and distribution of nociceptive afferents in the dorsal horn of the rat lumbar spinal cord at postnatal days 0, 5, 10, 15, 20, and 60. Transverse sections of the L4-L5 segments were processed for triple labeling with isolectin B4 (IB4)-binding as a marker of nonpeptidergic C-fibers, calcitonin gene-related peptide (CGRP) immunoreactivity to label peptidergic nociceptive afferents, and a fluorescent Nissl stain to visualize cells and lamination at different stages of postnatal development. The Nissl staining revealed that the thickness of lamina I (LI) and outer lamina II remained mostly unchanged from birth until adulthood. CGRP afferents terminated mostly in LI and the outer two-thirds of lamina II, whereas the termination area of fibers binding IB4 was centered on the middle one-third of lamina II at all ages studied. In absolute values, the overall width of the bands of intense CGRP and IB4 labeling increased with age but decreased as a percentage of the overall thickness of the dorsal horn with maturation. The overlap of CGRP termination area with that of IB4 afferents increased with age. The consequences of these findings are twofold. First, the size of the different laminae does not grow evenly across the dorsal horn. Second, CGRP and IB4 labeling cannot be considered per se to be reliable markers of lamination during development. These findings have implications for comparing data obtained in immature and mature tissues with respect to localization of structures in the dorsal horn.
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Affiliation(s)
- Louis-Etienne Lorenzo
- Department of Pharmacology and Therapeutics, McGill University, Montréal, Québec, Canada H3G 1Y6
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Majdi M, Ribeiro-da-Silva A, Cuello AC. Cognitive impairment and transmitter-specific pre- and postsynaptic changes in the rat cerebral cortex during ageing. Eur J Neurosci 2008; 26:3583-96. [PMID: 18088281 DOI: 10.1111/j.1460-9568.2007.05966.x] [Citation(s) in RCA: 32] [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] [Indexed: 12/01/2022]
Abstract
Recent studies suggest that age-related cognitive decline is correlated with an excitatory-inhibitory imbalance in synaptic discharges on pyramidal neurons. This study focuses on whether ageing and cognitive status correlates with relative numbers of excitatory and inhibitory presynaptic boutons. We investigated the density of excitatory and inhibitory presynaptic inputs across several areas of the rat cerebral cortex in young and aged male Fischer 344 rats. Aged animals were segregated into aged cognitively impaired (AI) and aged cognitively unimpaired (AU) groups using the Morris water maze. We applied immunohistochemistry to reveal the majority of excitatory and inhibitory presynaptic boutons captured with confocal microscopy and quantitative image analysis. A gradual decline in the density of excitatory and inhibitory presynaptic boutons occurred from young to AU to AI animals; however, the ratios of excitatory to inhibitory presynaptic bouton densities were not significantly altered. We further investigated the density of receptor scaffolding proteins representing key excitatory and inhibitory receptor postsynaptic sites, using antibodies against specific markers of excitatory and inhibitory postsynaptic densities, respectively. Significant changes in the ratios of excitatory to inhibitory postsynaptic densities were observed only in AI compared to young rats.
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Affiliation(s)
- Maryam Majdi
- Department of Pharmacology and Therapeutics, McGill University, 3655 Promenade Sir-William-Osler, Room 1325, Montreal, Quebec, Canada, H3G 1Y6
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Pitcher MH, Ribeiro-da-Silva A, Coderre TJ. Effects of inflammation on the ultrastructural localization of spinal cord dorsal horn group I metabotropic glutamate receptors. J Comp Neurol 2007; 505:412-23. [PMID: 17912745 DOI: 10.1002/cne.21506] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Inflammatory pain is thought to induce functional plasticity of spinal dorsal horn neurons and may produce changes in glutamate receptor expression. Plasticity of group I metabotropic glutamate receptors (mGluR1 and mGluR5) is important in various neuronal systems, and these receptors are also known to modulate nociceptive neurotransmission in the spinal dorsal horn. The present study aimed at determining whether persistent inflammatory pain produces alterations in intracellular and plasma membrane-associated mGluR1alpha and mGluR5 in spinal cord dorsal horn. Persistent inflammation was induced in male Long Evans rats by a unilateral intraplantar injection of 100 muL of complete Freund's adjuvant (CFA). Three days after the CFA injection thermal withdrawal latencies were obtained prior to processing of transverse spinal cord sections for preembedding immunogold labeling after incubation in primary antibody for mGluR1alpha or mGluR5. Using electron microscopy, we quantified immunogold-labeled mGluR1alpha and mGluR5 profiles, located in lamina V and I-II, respectively, of both CFA-treated rats and untreated control rats. Compared to untreated rats, CFA-treated rats had a significant increase in the number of plasma membrane-associated mGluR5 immunogold-labeled particles in lamina I-II neurons of the spinal cord. Although no changes to mGluR1alpha expression were found in CFA-treated rats, plasma membrane-associated mGluR1alpha was significantly closer to the synapse. Therefore, in CFA-treated rats there was a specific increase in the ratio of plasma membrane-associated versus intracellular immunogold-labeled particles for mGluR5, and lateral movement of mGluR1alpha toward the synapse, indicating that peripheral inflammation-induced trafficking of group I mGluRs in spinal dorsal horn neurons may be an important factor in the development of plastic changes associated with inflammation-induced chronic pain.
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Affiliation(s)
- Mark H Pitcher
- Department of Anesthesia, McGill University, Montreal, Quebec, Canada
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Almarestani L, Waters SM, Krause JE, Bennett GJ, Ribeiro-da-Silva A. Morphological characterization of spinal cord dorsal horn lamina I neurons projecting to the parabrachial nucleus in the rat. J Comp Neurol 2007; 504:287-97. [PMID: 17640051 DOI: 10.1002/cne.21410] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Many Rexed's lamina I neurons are nociceptive and project to the brain. Lamina I projection neurons can be classified as multipolar, fusiform, or pyramidal, based on cell body shape and characteristics of their proximal dendrites in the horizontal plane. There is also evidence that both multipolar and fusiform cells are nociceptive and pyramidal neurons nonnociceptive. In this investigation we identified which types of lamina I neurons belong to the spinoparabrachial tract in the rat and characterized them regarding the presence or absence of neurokinin-1 receptor (NK-1r) immunoreactivity. For this, cholera toxin subunit B (CTb), conjugated to a fluorescent marker was injected unilaterally into the parabrachial nucleus. Sections were additionally stained for the detection of NK-1r immunoreactivity and were examined using fluorescence and confocal microscopy. Serial confocal optical sections and 3D reconstructions were obtained for a considerable number of neurons per animal. Using immunofluorescence, we assessed the proportion of lamina I neurons belonging to the spinoparabrachial (SPB) tract and/or expressing NK-1r. The relative distribution of neurons belonging to the SPB tract was: 38.7% multipolar, 36.8% fusiform, 22.7% pyramidal, and 1.9% unclassified. Most of the SPB neurons expressing NK-1r were either multipolar or fusiform. Pyramidal SPB neurons were seldom immunoreactive for NK-1r, an observation that provides further support to the concept that most lamina I projection neurons of the pyramidal type are nonnociceptive. In addition, our study provides further evidence that these distinct morphological types of neurons differ in their phenotypic properties, but not in their projection patterns.
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Affiliation(s)
- L Almarestani
- Department of Pharmacology & Therapeutics, McGill University, Montreal, Quebec H3G 1Y6, Canada
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Arvanitis DN, Ducatenzeiler A, Ou JN, Grodstein E, Andrews SD, Tendulkar SR, Ribeiro-da-Silva A, Szyf M, Cuello AC. High intracellular concentrations of amyloid-beta block nuclear translocation of phosphorylated CREB. J Neurochem 2007; 103:216-28. [PMID: 17587310 DOI: 10.1111/j.1471-4159.2007.04704.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The beta-amyloid peptide (Abeta) is considered responsible for the pathogenesis of Alzheimer's disease. Despite the magnitude of reports describing a neurotoxic role of extracellular Abeta, the role for intracellular Abeta (iAbeta) has not been elucidated. We previously demonstrated that in rat pheochromocytoma cells expression of moderate levels of Abeta results in the up-regulation of phospho-extracellular signal-regulated kinases (ERK1)/2 along with an elevation of cyclic AMP-response element (CRE)-regulated gene expression; however, the effect of high intracellular levels of Abeta were not examined. Towards this goal we generated constructs that endogenously produce different expression levels of iAbeta in a human cell line. We show a bimodal response to Abeta in a neural human cell line. A moderate increase of endogenous Abeta up-regulates certain cyclic AMP-response element-binding protein (CREB) responsive genes such as presenilin 1, presenilin 2, brain-derived neurotrophic factor, and mRNA and protein levels by CREB activation and Synapsin 1 nuclear translocation. On the other hand, high-loads of iAbeta resulted in sustained hyper-phosphorylation of CREB that did not translocate to the nucleus and did not stimulate activation of CRE-regulated gene expression. Our study suggests that variations in levels of iAbeta could influence signaling mechanisms that lead to phosphorylation of CREB, its nuclear translocation and CRE-regulated genes involved in production of Abeta and synaptic plasticity in opposite directions.
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Affiliation(s)
- D N Arvanitis
- Department of Pharmacology & Therapeutics, McGill University, Montreal, Quebec, Canada
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