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Desvaux E, Hemon P, Soret P, Le Dantec C, Chatzis L, Cornec D, Devauchelle-Pensec V, Elouej S, Duguet F, Laigle L, Poirier N, Moingeon P, Bretin S, Pers JO. High-content multimodal analysis supports the IL-7/IL-7 receptor axis as a relevant therapeutic target in primary Sjögren's syndrome. J Autoimmun 2023:103147. [PMID: 38114349 DOI: 10.1016/j.jaut.2023.103147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 10/18/2023] [Accepted: 10/25/2023] [Indexed: 12/21/2023]
Abstract
OBJECTIVE While the involvement of IL-7/IL-7R axis in pSS has been described in relation to T cells, little is known about the contribution of this pathway in relationship with other immune cells, and its implication in autoimmunity. Using high-content multiomics data, we aimed at characterizing IL-7R expressing cells and the involvement of IL-7/IL-7R pathway in pSS pathophysiology. METHODS An IL-7 signature established using RNA-sequencing of human PBMCs incubated with IL-7 was applied to 304 pSS patients, and on RNA-Seq datasets from tissue biopsies. High-content immunophenotyping using flow and imaging mass cytometry was developed to characterize peripheral and in situ IL-7R expression. RESULTS We identified a blood 4-gene IL-7 module (IKZF4, KIAA0040, PGAP1 and SOS1) associated with anti-SSA/Ro positiveness in patients as well as disease activity, and a tissue 5-gene IL-7 module (IL7R, PCED1B, TNFSF8, ADAM19, MYBL1) associated with infiltration severity. We confirmed expression of IL-7R on T cells subsets, and further observed upregulation of IL-7R on double-negative (DN) B cells, and especially DN2 B cells. IL-7R expression was increased in pSS compared to sicca patients with variations seen according to the degree of infiltration. When expressed, IL-7R was mainly found on epithelial cells, CD4+ and CD8+ T cells, switched memory B cells, DN B cells and M1 macrophages. CONCLUSION This exhaustive characterization of the IL-7/IL-7R pathway in pSS pathophysiology established that two IL-7 gene modules discriminate pSS patients with a high IL-7 axis involvement. Their use could guide the implementation of an anti-IL-7R targeted therapy in a precision medicine approach.
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Affiliation(s)
- Emiko Desvaux
- LBAI, UMR1227, University of Brest, Inserm, Brest, France; Institut de Recherches Internationales Servier, Research and Development, Suresnes, France
| | - Patrice Hemon
- LBAI, UMR1227, University of Brest, Inserm, Brest, France
| | - Perrine Soret
- Institut de Recherches Internationales Servier, Research and Development, Suresnes, France
| | | | - Loukas Chatzis
- LBAI, UMR1227, University of Brest, Inserm, Brest, France; Department of Pathophysiology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - Divi Cornec
- LBAI, UMR1227, University of Brest, Inserm, Brest, France; CHU de Brest, Brest, France
| | | | - Sahar Elouej
- Institut de Recherches Internationales Servier, Research and Development, Suresnes, France
| | - Fanny Duguet
- Institut de Recherches Internationales Servier, Research and Development, Suresnes, France
| | - Laurence Laigle
- Institut de Recherches Internationales Servier, Research and Development, Suresnes, France
| | | | - Philippe Moingeon
- Institut de Recherches Internationales Servier, Research and Development, Suresnes, France
| | - Sylvie Bretin
- Institut de Recherches Internationales Servier, Research and Development, Suresnes, France
| | - Jacques-Olivier Pers
- LBAI, UMR1227, University of Brest, Inserm, Brest, France; CHU de Brest, Brest, France.
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Monteiro-Fernandes D, Silva JM, Soares-Cunha C, Dalla C, Kokras N, Arnaud F, Billiras R, Zhuravleva V, Waites C, Bretin S, Sousa N, Sotiropoulos I. Allosteric modulation of AMPA receptors counteracts Tau-related excitotoxic synaptic signaling and memory deficits in stress- and Aβ-evoked hippocampal pathology. Mol Psychiatry 2021; 26:5899-5911. [PMID: 32467647 DOI: 10.1038/s41380-020-0794-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Revised: 05/12/2020] [Accepted: 05/18/2020] [Indexed: 12/12/2022]
Abstract
Despite considerable progress in the understanding of its neuropathology, Alzheimer's disease (AD) remains a complex disorder with no effective treatment that counteracts the memory deficits and the underlying synaptic malfunction triggered by the accumulation of amyloid beta (Aβ) and Tau protein. Mounting evidence supports a precipitating role for chronic environmental stress and glutamatergic excitotoxicity in AD, suggesting that targeting of glutamate receptor signaling may be a promising approach against both stress and AD pathologies. In light of the limited cognitive benefit of the direct antagonism of NMDA receptors in AD, we here focus on an alternative way to modify glutamatergic signaling through positive allosteric modulation of AMPA receptors, by the use of a PAM-AMPA compound. Using non-transgenic animal model of Aβ oligomer injection as well as the combined stress and Aβ i.c.v. infusion, we demonstrate that positive allosteric modulation of AMPA receptors by PAM-AMPA treatment reverted memory, but not mood, deficits. Furthermore, PAM-AMPA treatment reverted stress/Aβ-driven synaptic missorting of Tau and associated Fyn/GluN2B-driven excitotoxic synaptic signaling accompanied by recovery of neurotransmitter levels in the hippocampus. Our findings suggest that positive allosteric modulation of AMPA receptors restores synaptic integrity and cognitive performance in stress- and Aβ-evoked hippocampal pathology. As the prevalence of AD is increasing at an alarming rate, novel therapeutic targeting of glutamatergic signaling should be further explored against the early stages of AD synaptic malfunction with the goal of attenuating further synaptic damage before it becomes irreversible.
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Affiliation(s)
- Daniela Monteiro-Fernandes
- Life and Health Sciences Research Institute (ICVS), Medical School, University of Minho, Campus Gualtar, Minho, Portugal
- ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Joana Margarida Silva
- Life and Health Sciences Research Institute (ICVS), Medical School, University of Minho, Campus Gualtar, Minho, Portugal
- ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Carina Soares-Cunha
- Life and Health Sciences Research Institute (ICVS), Medical School, University of Minho, Campus Gualtar, Minho, Portugal
- ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Christina Dalla
- Department of Pharmacology, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Nikolaos Kokras
- Department of Pharmacology, Medical School, National and Kapodistrian University of Athens, Athens, Greece
- First Department of Psychiatry, Eginition Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - François Arnaud
- Pôle Innovation Thérapeutique Neuropsychiatrie, Institut de Recherches Internationales Servier, Suresnes, France
| | - Rodolphe Billiras
- Pôle Innovation Thérapeutique Neuropsychiatrie, Institut de Recherches Internationales Servier, Suresnes, France
| | - Viktoriya Zhuravleva
- Neurobiology and Behavior Graduate Program, Columbia University, New York, NY, USA
| | - Clarissa Waites
- Department of Pathology and Cell Biology, Taub Institute for Research on Alzheimer's Disease and the Aging Brain, Columbia University Medical Center, New York, NY, USA
- Department of Neuroscience, Columbia University, New York, NY, USA
| | - Sylvie Bretin
- Pôle Innovation Thérapeutique Neuropsychiatrie, Institut de Recherches Internationales Servier, Suresnes, France
| | - Nuno Sousa
- Life and Health Sciences Research Institute (ICVS), Medical School, University of Minho, Campus Gualtar, Minho, Portugal
- ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Ioannis Sotiropoulos
- Life and Health Sciences Research Institute (ICVS), Medical School, University of Minho, Campus Gualtar, Minho, Portugal.
- ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal.
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Bretin S, Krazem A, Henkous N, Froger-Colleaux C, Mocaer E, Louis C, Perdaems N, Marighetto A, Beracochea D. Synergistic enhancing-memory effect of donepezil and S 47445, an AMPA positive allosteric modulator, in middle-aged and aged mice. Psychopharmacology (Berl) 2018; 235:771-787. [PMID: 29167913 PMCID: PMC5847048 DOI: 10.1007/s00213-017-4792-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Accepted: 11/14/2017] [Indexed: 11/30/2022]
Abstract
Positive allosteric modulators of AMPA receptors (AMPA-PAMs) are described to facilitate cognitive processes in different memory-based models. Among them, S 47445 is a novel potent and selective AMPA-PAM. In order to assess its efficacy after repeated administration, S 47445 effect was evaluated in two aging-induced memory dysfunction tasks in old mice, one short-term working memory model evaluated in a radial maze task and one assessing contextual memory performance. S 47445 was shown to improve cognition in both models sensitive to aging. In fact, administration of S 47445 at 0.3 mg/kg (s.c.) reversed the age-induced deficits of the working memory model whatever the retention interval. Moreover, in the contextual task, S 47445 also reversed the age-induced deficit at all tested doses (from 0.03 to 0.3 mg/kg, p.o.). Since donepezil, an acetylcholinesterase inhibitor, induces only moderate symptomatic effects on memory in Alzheimer's disease patients, an alternative strategy for treatment of cognitive symptoms could be to act simultaneously on both glutamatergic AMPA receptors and cholinergic pathways by combining pharmacological treatments. The present study further examined such effects by assessing combinations of S 47445 and donepezil given orally during 9 days in aged C57/Bl6J mice using contextual memory task (CSD) and the working memory model of serial alternation task (AT). Interestingly, a significant synergistic memory-enhancing effect was observed with the combination of donepezil at 0.1 mg/kg with S 47445 at 0.1 mg/kg p.o. in the CSD or with S 47445 at 0.1 and 0.3 mg/kg in AT in comparison to compounds given alone and without any pharmacokinetic interaction.
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Affiliation(s)
- S Bretin
- Institut de Recherches Internationales Servier, Pôle d'Innovation Thérapeutique Neuropsychiatrie, Suresnes, France
| | - A Krazem
- Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (INCIA), Université de Bordeaux, UMR CNRS 5287, Allée Geoffroy Saint-Hilaire, Bat B2, 33613, Pessac, France
| | - N Henkous
- Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (INCIA), Université de Bordeaux, UMR CNRS 5287, Allée Geoffroy Saint-Hilaire, Bat B2, 33613, Pessac, France
| | - C Froger-Colleaux
- Froger-Colleaux C, Porsolt Research Laboratory, Z.A de Glatiné, 53940, Le Genest-Saint-Isle, France
| | - E Mocaer
- Institut de Recherches Internationales Servier, Pôle d'Innovation Thérapeutique Neuropsychiatrie, Suresnes, France
| | - C Louis
- Institut de Recherches Servier, Pôle d'Innovation Thérapeutique Neuropsychiatrie, Croissy-Sur-Seine, France
| | - N Perdaems
- Pôle Expertise en Pharmacocinétique, Orléans, France
| | - A Marighetto
- INSERM, Neurocentre Magendie, Physiopathologie de la plasticité neuronale, U1215, 33077, Bordeaux, France
| | - D Beracochea
- Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (INCIA), Université de Bordeaux, UMR CNRS 5287, Allée Geoffroy Saint-Hilaire, Bat B2, 33613, Pessac, France.
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Mendez-David I, Guilloux JP, Papp M, Tritschler L, Mocaer E, Gardier AM, Bretin S, David DJ. S 47445 Produces Antidepressant- and Anxiolytic-Like Effects through Neurogenesis Dependent and Independent Mechanisms. Front Pharmacol 2017; 8:462. [PMID: 28769796 PMCID: PMC5515821 DOI: 10.3389/fphar.2017.00462] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [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: 05/09/2017] [Accepted: 06/28/2017] [Indexed: 12/20/2022] Open
Abstract
Glutamatergic dysfunctions are observed in the pathophysiology of depression. The glutamatergic synapse as well as the AMPA receptor’s (AMPAR) activation may represent new potential targets for therapeutic intervention in the context of major depressive disorders. S 47445 is a novel AMPARs positive allosteric modulator (AMPA-PAM) possessing procognitive, neurotrophic properties and enhancing synaptic plasticity. Here, we investigated the antidepressant/anxiolytic-like effects of S 47445 in a mouse model of anxiety/depression based on chronic corticosterone administration (CORT) and in the Chronic Mild Stress (CMS) model in rats. Four doses of S 47445 (0.3 to 10 mg/kg, oral route, 4 and 5 weeks, respectively) were assessed in both models. In mouse, behavioral effects were tested in various anxiety-and depression-related behaviors : the elevated plus maze (EPM), open field (OF), splash test (ST), forced swim test (FST), tail suspension test (TST), fur coat state and novelty suppressed feeding (NSF) as well as on hippocampal neurogenesis and dendritic arborization in comparison to chronic fluoxetine treatment (18 mg/kg, p.o.). In rats, behavioral effects of S 47445 were monitored using sucrose consumption and compared to those of imipramine or venlafaxine (10 mg/kg, i.p.) during the whole treatment period and after withdrawal of treatments. In a mouse model of genetic ablation of hippocampal neurogenesis (GFAP-Tk model), neurogenesis dependent/independent effects of chronic S 47445 treatment were tested, as well as BDNF hippocampal expression. S 47445 reversed CORT-induced depressive-like state by increasing grooming duration and reversing coat state’s deterioration. S 47445 also decreased the immobility duration in TST and FST. The highest doses (3 and 10 mg/kg) seem the most effective for antidepressant-like activity in CORT mice. Furthermore, S 47445 significantly reversed the anxiety phenotype observed in OF (at 1 mg/kg) and EPM (from 1 mg/kg). In the CMS rat model, S 47445 (from 1 mg/kg) demonstrated a rapid onset of effect on anhedonia compared to venlafaxine and imipramine. In the CORT model, S 47445 demonstrated significant neurogenic effects on proliferation, survival and maturation of hippocampal newborn neurons at doses inducing an antidepressant-like effect. It also corrected CORT-induced deficits of growth and arborization of dendrites. Finally, the antidepressant/anxiolytic-like activities of S 47445 required adult hippocampal neurogenesis in the novelty suppressed feeding test contrary to OF, EPM and ST. The observed increase in hippocampal BDNF levels could be one of the mechanisms of S 47445 responsible for the adult hippocampal neurogenesis increase. Altogether, S 47445 displays robust antidepressant-anxiolytic-like properties after chronic administration through neurogenesis dependent/independent mechanisms and neuroplastic activities. The AMPA-PAM S 47445 could have promising therapeutic potential for the treatment of major depressive disorders or generalized anxiety disorders.
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Affiliation(s)
- Indira Mendez-David
- CESP/UMRS-1178, Faculté de Pharmacie, Institut National de la Santé et de la Recherche Médicale, Université Paris-Sud - Université Paris-SaclayChatenay-Malabry, France
| | - Jean-Philippe Guilloux
- CESP/UMRS-1178, Faculté de Pharmacie, Institut National de la Santé et de la Recherche Médicale, Université Paris-Sud - Université Paris-SaclayChatenay-Malabry, France
| | - Mariusz Papp
- Institute of Pharmacology, Polish Academy of SciencesKrakow, Poland
| | - Laurent Tritschler
- CESP/UMRS-1178, Faculté de Pharmacie, Institut National de la Santé et de la Recherche Médicale, Université Paris-Sud - Université Paris-SaclayChatenay-Malabry, France
| | | | - Alain M Gardier
- CESP/UMRS-1178, Faculté de Pharmacie, Institut National de la Santé et de la Recherche Médicale, Université Paris-Sud - Université Paris-SaclayChatenay-Malabry, France
| | - Sylvie Bretin
- Institut de Recherches Internationales ServierSuresnes, France
| | - Denis J David
- CESP/UMRS-1178, Faculté de Pharmacie, Institut National de la Santé et de la Recherche Médicale, Université Paris-Sud - Université Paris-SaclayChatenay-Malabry, France
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Bretin S, Giralt A, Gómez‐Climent MÁ, Alcalá R, Delgado‐Garcia JM, Pérez‐Navarro E, Alberch J, Gruart A. [P4–036]: THE NOVEL AMPA RECEPTOR POSITIVE ALLOSTERIC MODULATOR S 47445 RESCUES IN VIVO CA3‐CA1 LONG‐TERM POTENTIATION AND STRUCTURAL SYNAPTIC CHANGES IN MIDDLE‐AGED MICE. Alzheimers Dement 2017. [DOI: 10.1016/j.jalz.2017.06.1900] [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: 10/18/2022]
Affiliation(s)
- Sylvie Bretin
- Institut de Recherches Internationales ServierSuresnesFrance
| | - Albert Giralt
- Facultat de MedicinaInstitut de Neurociències, Universitat de BarcelonaBarcelonaSpain
- (3) Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS)BarcelonaSpain
- Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED)MadridSpain
| | | | - Rafael Alcalá
- Facultat de MedicinaInstitut de Neurociències, Universitat de BarcelonaBarcelonaSpain
- Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED)MadridSpain
- Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS)BarcelonaSpain
| | | | - Esther Pérez‐Navarro
- Facultat de MedicinaInstitut de Neurociències, Universitat de BarcelonaBarcelonaSpain
- Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED)MadridSpain
- Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS)BarcelonaSpain
| | - Jordi Alberch
- Facultat de MedicinaInstitut de Neurociències, Universitat de BarcelonaBarcelonaSpain
- Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED)MadridSpain
- Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS)BarcelonaSpain
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Cummings JL, Bernard K, Bretin S, Gouttefangeas S, Pueyo M. [O2–09–04]: PHASE II CLINICAL TRIAL WITH AN AMPA‐POSITIVE ALLOSTERIC MODULATOR (S 47445): BASELINE DEMOGRAPHIC AND CLINICAL CHARACTERISTICS OF PATIENTS SUFFERING FROM ALZHEIMER's DISEASE AT MILD TO MODERATE STAGES WITH DEPRESSIVE SYMPTOMS. Alzheimers Dement 2017. [DOI: 10.1016/j.jalz.2017.07.195] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Jeffrey L. Cummings
- Cleveland Clinic Lou Ruvo Center for Brain HealthLas VegasNVUSA
- Institut de Recherches Internationales ServierSuresnesFrance
| | - Katy Bernard
- Cleveland Clinic Lou Ruvo Center for Brain HealthLas VegasNVUSA
| | - Sylvie Bretin
- Cleveland Clinic Lou Ruvo Center for Brain HealthLas VegasNVUSA
| | | | - Maria Pueyo
- Cleveland Clinic Lou Ruvo Center for Brain HealthLas VegasNVUSA
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Calabrese F, Savino E, Mocaer E, Bretin S, Racagni G, Riva MA. Upregulation of neurotrophins by S 47445, a novel positive allosteric modulator of AMPA receptors in aged rats. Pharmacol Res 2017; 121:59-69. [PMID: 28442348 DOI: 10.1016/j.phrs.2017.04.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 04/13/2017] [Accepted: 04/14/2017] [Indexed: 02/06/2023]
Abstract
At molecular levels, it has been shown that aging is associated with alterations in neuroplastic mechanisms. In this study, it was examined if the altered expression of neurotrophins observed in aged rats could be corrected by a chronic treatment with S 47445 (1-3-10mg/kg, p.o.), a novel selective positive allosteric modulator of the AMPA receptors. Both the mRNA and the protein levels of the neurotrophins Bdnf, NT-3 and Ngf were specifically measured in the prefrontal cortex and hippocampus (ventral and dorsal) of aged rats. It was found that 2-week-treatment with S 47445 corrected the age-related deficits of these neurotrophins and/or positively modulated their expression in comparison to vehicle aged rats in the range of procognitive and antidepressant active doses in rodents. Collectively, the ability of S 47445 to modulate various neurotrophins demonstrated its neurotrophic properties in two major brain structures involved in cognition and mood regulation suggesting its therapeutic potential for improving several diseases such as Alzheimer's disease and/or Major Depressive Disorders.
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Affiliation(s)
- Francesca Calabrese
- Department of Pharmacological and Biomolecular Sciences, Universita' degli Studi di Milano, Milan, Italy
| | - Elisa Savino
- Department of Pharmacological and Biomolecular Sciences, Universita' degli Studi di Milano, Milan, Italy
| | - Elisabeth Mocaer
- Neuropsychiatric Innovation Therapeutic Pole, Institut de Recherches Internationales Servier, Suresnes, France
| | - Sylvie Bretin
- Neuropsychiatric Innovation Therapeutic Pole, Institut de Recherches Internationales Servier, Suresnes, France
| | - Giorgio Racagni
- Department of Pharmacological and Biomolecular Sciences, Universita' degli Studi di Milano, Milan, Italy
| | - Marco A Riva
- Department of Pharmacological and Biomolecular Sciences, Universita' degli Studi di Milano, Milan, Italy.
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Bretin S, Rogemond V, Marin P, Maus M, Torrens Y, Honnorat J, Glowinski J, Prémont J, Gauchy C. Calpain product of WT-CRMP2 reduces the amount of surface NR2B NMDA receptor subunit. J Neurochem 2006; 98:1252-65. [PMID: 16787405 DOI: 10.1111/j.1471-4159.2006.03969.x] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.6] [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: 11/28/2022]
Abstract
The brain is particularly vulnerable to ischaemia; however, neurons can become tolerant to ischaemic insult. This tolerance has been shown to involve activation of NMDA receptors, but its mechanisms have not yet been fully elucidated. Using a preconditioning protocol, we show that neurons surviving to a transient NMDA exposure become resistant to the glutamatergic agonist. Using a proteomic approach, we found that alterations of the protein pattern of NMDA-resistant neurons are restricted mainly to the five collapsin response mediator proteins (CRMPs). A sustained increase in calpain activity following NMDA treatment is responsible for the production of cleaved CRMPs. Finally, we provide evidence for the involvement of the cleaved form of WT-CRMP2 in the down-regulation of NR2B. Our data suggests that, beside their role in neuronal morphogenesis, CRMPs may contribute to neuronal plasticity.
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Maus M, Torrens Y, Gauchy C, Bretin S, Nairn AC, Glowinski J, Premont J. 2-Deoxyglucose and NMDA inhibit protein synthesis in neurons and regulate phosphorylation of elongation factor-2 by distinct mechanisms. J Neurochem 2006; 96:815-24. [PMID: 16405506 DOI: 10.1111/j.1471-4159.2005.03601.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Cerebral ischaemia is associated with brain damage and inhibition of neuronal protein synthesis. A deficit in neuronal metabolism and altered excitatory amino acid release may both contribute to those phenomena. In the present study, we demonstrate that both NMDA and metabolic impairment by 2-deoxyglucose or inhibitors of mitochondrial respiration inhibit protein synthesis in cortical neurons through the phosphorylation of eukaryotic elongation factor (eEF-2), without any change in phosphorylation of initiation factor eIF-2alpha. eEF-2 kinase may be activated both by Ca(2+)-independent AMP kinase or by an increase in cytosolic Ca2+. Although NMDA decreases ATP levels in neurons, only the effects of 2-deoxyglucose on protein synthesis and phosphorylation of elongation factor eEF-2 were reversed by Na(+) pyruvate. Protein synthesis inhibition by 2-deoxyglucose was not as a result of a secondary release of glutamate from cortical neurons as it was not prevented by the NMDA receptor antagonist 5-methyl-10,11-dihydro-5H-dibenzo-(a,d)-cyclohepten-5,10-imine hydrogen maleate (MK 801), nor to an increase in cytosolic-free Ca2+. Conversely, 2-deoxyglucose likely activates eEF-2 kinase through a process involving phosphorylation by AMP kinase. In conclusion, we provide evidence that protein synthesis can be inhibited by NMDA and metabolic deprivation by two distinct mechanisms involving, respectively, Ca(2+)-dependent and Ca(2+)-independent eEF-2 phosphorylation.
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Affiliation(s)
- M Maus
- Collège de France, INSERM, Paris, France
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Bretin S, Reibel S, Charrier E, Maus-Moatti M, Auvergnon N, Thevenoux A, Glowinski J, Rogemond V, Prémont J, Honnorat J, Gauchy C. Differential expression of CRMP1, CRMP2A, CRMP2B, and CRMP5 in axons or dendrites of distinct neurons in the mouse brain. J Comp Neurol 2005; 486:1-17. [DOI: 10.1002/cne.20465] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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