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Hoffman JL, Faccidomo SP, Taylor SM, DeMiceli KG, May AM, Smith EN, Whindleton CM, Hodge CW. Negative modulation of AMPA receptors bound to transmembrane AMPA receptor regulatory protein γ-8 blunts the positive reinforcing properties of alcohol and sucrose in a brain region-dependent manner in male mice. Psychopharmacology (Berl) 2023; 240:1261-1273. [PMID: 37055596 PMCID: PMC10698495 DOI: 10.1007/s00213-023-06365-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 04/06/2023] [Indexed: 04/15/2023]
Abstract
RATIONALE The development and progression of alcohol use disorder (AUD) are widely viewed as maladaptive neuroplasticity. The transmembrane alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptor (AMPAR) regulatory protein γ8 (TARP γ-8) is a molecular mechanism of neuroplasticity that has not been evaluated in AUD or other addictions. OBJECTIVE To address this gap in knowledge, we evaluated the mechanistic role of TARP γ-8 bound AMPAR activity in the basolateral amygdala (BLA) and ventral hippocampus (vHPC) in the positive reinforcing effects of alcohol, which drive repetitive alcohol use throughout the course of AUD, in male C57BL/6 J mice. These brain regions were selected because they exhibit high levels of TARP γ-8 expression and send glutamate projections to the nucleus accumbens (NAc), which is a key nucleus in the brain reward pathway. METHODS AND RESULTS Site-specific pharmacological inhibition of AMPARs bound to TARP γ-8 in the BLA via bilateral infusion of the selective negative modulator JNJ-55511118 (0-2 µg/µl/side) significantly decreased operant alcohol self-administration with no effect on sucrose self-administration in behavior-matched controls. Temporal analysis showed that reductions in alcohol-reinforced response rate occurred > 25 min after the onset of responding, consistent with a blunting of the positive reinforcing effects of alcohol in the absence of nonspecific behavioral effects. In contrast, inhibition of TARP γ-8 bound AMPARs in the vHPC selectively decreased sucrose self-administration with no effect on alcohol. CONCLUSIONS This study reveals a novel brain region-specific role of TARP γ-8 bound AMPARs as a molecular mechanism of the positive reinforcing effects of alcohol and non-drug rewards.
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Affiliation(s)
- Jessica L Hoffman
- Bowles Center for Alcohol Studies, School of Medicine, University of North Carolina at Chapel Hill, Thurston-Bowles Building, CB#7178, Chapel Hill, NC, 27599, USA
| | - Sara P Faccidomo
- Bowles Center for Alcohol Studies, School of Medicine, University of North Carolina at Chapel Hill, Thurston-Bowles Building, CB#7178, Chapel Hill, NC, 27599, USA
- Department of Psychiatry, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Seth M Taylor
- Bowles Center for Alcohol Studies, School of Medicine, University of North Carolina at Chapel Hill, Thurston-Bowles Building, CB#7178, Chapel Hill, NC, 27599, USA
| | - Kristina G DeMiceli
- Bowles Center for Alcohol Studies, School of Medicine, University of North Carolina at Chapel Hill, Thurston-Bowles Building, CB#7178, Chapel Hill, NC, 27599, USA
| | - Ashley M May
- Bowles Center for Alcohol Studies, School of Medicine, University of North Carolina at Chapel Hill, Thurston-Bowles Building, CB#7178, Chapel Hill, NC, 27599, USA
| | - Evan N Smith
- Bowles Center for Alcohol Studies, School of Medicine, University of North Carolina at Chapel Hill, Thurston-Bowles Building, CB#7178, Chapel Hill, NC, 27599, USA
| | - Ciarra M Whindleton
- Bowles Center for Alcohol Studies, School of Medicine, University of North Carolina at Chapel Hill, Thurston-Bowles Building, CB#7178, Chapel Hill, NC, 27599, USA
| | - Clyde W Hodge
- Bowles Center for Alcohol Studies, School of Medicine, University of North Carolina at Chapel Hill, Thurston-Bowles Building, CB#7178, Chapel Hill, NC, 27599, USA.
- Department of Psychiatry, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
- Department of Pharmacology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
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Bauer MR, McVey MM, Germano DM, Zhang Y, Boehm SL. Intra-dorsolateral striatal AMPA receptor antagonism reduces binge-like alcohol drinking in male and female C57BL/6J mice. Behav Brain Res 2022; 418:113631. [PMID: 34715146 PMCID: PMC8671209 DOI: 10.1016/j.bbr.2021.113631] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 09/15/2021] [Accepted: 10/11/2021] [Indexed: 12/27/2022]
Abstract
The dorsolateral striatum (DLS) is involved in addiction, reward, and alcohol related behaviors. The DLS primarily receives excitatory inputs which are gated by post-synaptic AMPA receptors. We antagonized AMPA receptors in the DLS to investigate how such modulation affects binge-like alcohol drinking in male and female C57BL/6J mice and whether an associated alcohol drinking history alters dorsomedial striatum (DMS) and DLS AMPA receptor expression. We also investigated the effect of intra-DLS NBQX on locomotor activity and saccharin drinking in mice. Mice were allowed free access to 20% alcohol for two hours each day for a total of seven days. Mice received an intra-DLS infusion of one of four concentrations of NBQX (saline, 0.15, 0.5, or 1.5 μg/side), an AMPA receptor antagonist, immediately prior to alcohol access on day 7. Two-hour binge alcohol intakes, locomotor activity, and blood alcohol concentrations were determined. Intra-DLS NBQX reduced binge-like alcohol drinking in a U-shaped manner in male and female mice. Intake predicted blood alcohol concentration, and locomotor activity was not affected. In a follow up experiment, we assessed whether the most effective NBQX concentration for reducing alcohol consumption also reduced saccharin drinking, finding intra-DLS NBQX did not alter saccharin drinking in male and female mice. These data suggest that AMPA receptors in the DLS play a role in the modulation of binge-like alcohol drinking. These findings further validate the importance of the DLS for alcohol related behaviors and alcohol use disorder.
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Affiliation(s)
- Meredith R Bauer
- Indiana Alcohol Research Center and Department of Psychology, Indiana University - Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Megan M McVey
- Indiana Alcohol Research Center and Department of Psychology, Indiana University - Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Damon M Germano
- Indiana Alcohol Research Center and Department of Psychology, Indiana University - Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Yanping Zhang
- Indiana Alcohol Research Center and Department of Psychology, Indiana University - Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Stephen L Boehm
- Indiana Alcohol Research Center and Department of Psychology, Indiana University - Purdue University Indianapolis, Indianapolis, IN 46202, USA.
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Feng Y, Shi R, Hu J, Lou S. Effects of neural-derived estradiol on actin polymerization and synaptic plasticity-related proteins in prefrontal and hippocampal cells of mice. Steroids 2022; 177:108935. [PMID: 34715132 DOI: 10.1016/j.steroids.2021.108935] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Revised: 10/07/2021] [Accepted: 10/13/2021] [Indexed: 10/20/2022]
Abstract
Neural-derived 17β-estradiol (E2) plays an important role in the synaptic plasticity of the hippocampus and prefrontal cortex, but the mechanism is not well defined. This study was designed to explore the effect and mechanism of neural-derived E2 on synaptic plasticity of the hippocampus and prefrontal cortex. Primary cultured hippocampal and prefrontal cells in mice were randomly divided into the DMSO (D), aromatase (Rate-limiting enzymes for E2 synthesizes) inhibitor letrozole (L), and ERs antagonist (MPG) treated groups. After intervention for 48 h, the cell was collected, and then, the expressions of AMPA-receptor subunit GluR1 (GluR1), synaptophysin (SYN), p-21-Activated kinase (PAK) phosphorylation, Rho kinase (ROCK), p-Cofilin, F-actin, and G-actin proteins were detected. Letrozole or ER antagonists inhibited the expression of GluR1, F-actin/G-actin, p-PAK and p-Cofilin proteins in prefrontal cells significantly. And the expressions of GluR1 and F-actin/G-actin proteins were declined in hippocampal cells markedly after adding letrozole or ERs antagonists. In conclusion, neural-derived E2 and ERs regulated the synaptic plasticity, possibly due to promoting actin polymerization in prefrontal and hippocampal cells. The regional specificity in the effect of neural-derived E2 and ERs on the actin polymerization-related pathway may provide a theoretical basis for the functional differences between the hippocampus and prefrontal cortex.
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Affiliation(s)
- Yu Feng
- Shanghai University of Sport, Kinesiology, Shanghai, China
| | - Rengfei Shi
- Shanghai University of Sport, Kinesiology, Shanghai, China
| | - Jingyun Hu
- Shanghai University of Sport, Kinesiology, Shanghai, China
| | - Shujie Lou
- Shanghai University of Sport, Kinesiology, Shanghai, China.
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4
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Amakhin DV, Soboleva EB, Chizhov AV, Zaitsev AV. Insertion of Calcium-Permeable AMPA Receptors during Epileptiform Activity In Vitro Modulates Excitability of Principal Neurons in the Rat Entorhinal Cortex. Int J Mol Sci 2021; 22:12174. [PMID: 34830051 PMCID: PMC8621524 DOI: 10.3390/ijms222212174] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 11/05/2021] [Accepted: 11/07/2021] [Indexed: 12/19/2022] Open
Abstract
Epileptic activity leads to rapid insertion of calcium-permeable α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors (CP-AMPARs) into the synapses of cortical and hippocampal glutamatergic neurons, which generally do not express them. The physiological significance of this process is not yet fully understood; however, it is usually assumed to be a pathological process that augments epileptic activity. Using whole-cell patch-clamp recordings in rat entorhinal cortex slices, we demonstrate that the timing of epileptiform discharges, induced by 4-aminopyridine and gabazine, is determined by the shunting effect of Ca2+-dependent slow conductance, mediated predominantly by K+-channels. The blockade of CP-AMPARs by IEM-1460 eliminates this extra conductance and consequently increases the rate of discharge generation. The blockade of NMDARs reduced the additional conductance to a lesser extent than the blockade of CP-AMPARs, indicating that CP-AMPARs are a more significant source of intracellular Ca2+. The study's main findings were implemented in a mathematical model, which reproduces the shunting effect of activity-dependent conductance on the generation of discharges. The obtained results suggest that the expression of CP-AMPARs in principal neurons reduces the discharge generation rate and may be considered as a protective mechanism.
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Affiliation(s)
- Dmitry V. Amakhin
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Toreza Prospekt 44, 194223 Saint Petersburg, Russia; (D.V.A.); (E.B.S.); (A.V.C.)
| | - Elena B. Soboleva
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Toreza Prospekt 44, 194223 Saint Petersburg, Russia; (D.V.A.); (E.B.S.); (A.V.C.)
| | - Anton V. Chizhov
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Toreza Prospekt 44, 194223 Saint Petersburg, Russia; (D.V.A.); (E.B.S.); (A.V.C.)
- Ioffe Institute, Russian Academy of Sciences, Polytekhnicheskaya 26, 194021 Saint Petersburg, Russia
| | - Aleksey V. Zaitsev
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Toreza Prospekt 44, 194223 Saint Petersburg, Russia; (D.V.A.); (E.B.S.); (A.V.C.)
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Abstract
RNA aptamers are single-stranded RNA molecules, and they are selected against a target of interest so that they can bind to and modulate the activity of the target, such as inhibiting the target activity, with high potency and selectivity. Antagonists, such as RNA aptamers, acting on AMPA receptors, a major subtype of ionotropic glutamate receptors, are potential drug candidates for treatment of a number of CNS diseases that involve excessive receptor activation and/or elevated receptor expression. Here we review the approach to discover RNA aptamers targeting AMPA receptors from a random sequence library (∼1014 sequences) through a process called systematic evolution of ligands by exponential enrichment (SELEX). As compared with small-molecule compounds, RNA aptamers are a new class of regulatory agents with interesting and desirable pharmacological properties. Some AMPA receptor aptamers we have developed are presented in this review. The promises and challenges of translating RNA aptamers into potential drugs and treatment options are also discussed. This article is part of the special Issue on 'Glutamate Receptors - AMPA receptors'.
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Affiliation(s)
- Zhen Huang
- Chemistry Department, Center for Neuroscience Research, University at Albany, State University of New York (SUNY), Albany, NY, USA
| | - Li Niu
- Chemistry Department, Center for Neuroscience Research, University at Albany, State University of New York (SUNY), Albany, NY, USA.
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Sanderson JL, Freund RK, Gorski JA, Dell'Acqua ML. β-Amyloid disruption of LTP/LTD balance is mediated by AKAP150-anchored PKA and Calcineurin regulation of Ca 2+-permeable AMPA receptors. Cell Rep 2021; 37:109786. [PMID: 34610314 PMCID: PMC8530450 DOI: 10.1016/j.celrep.2021.109786] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 07/02/2021] [Accepted: 09/10/2021] [Indexed: 01/28/2023] Open
Abstract
Regulated insertion and removal of postsynaptic AMPA glutamate receptors (AMPARs) mediates hippocampal long-term potentiation (LTP) and long-term depression (LTD) synaptic plasticity underlying learning and memory. In Alzheimer’s disease β-amyloid (Aβ) oligomers may impair learning and memory by altering AMPAR trafficking and LTP/LTD balance. Importantly, Ca2+-permeable AMPARs (CP-AMPARs) assembled from GluA1 subunits are excluded from hippocampal synapses basally but can be recruited rapidly during LTP and LTD to modify synaptic strength and signaling. By employing mouse knockin mutations that disrupt anchoring of the kinase PKA or phosphatase Calcineurin (CaN) to the postsynaptic scaffold protein AKAP150, we find that local AKAP-PKA signaling is required for CP-AMPAR recruitment, which can facilitate LTP but also, paradoxically, prime synapses for Aβ impairment of LTP mediated by local AKAP-CaN LTD signaling that promotes subsequent CP-AMPAR removal. These findings highlight the importance of PKA/CaN signaling balance and CP-AMPARs in normal plasticity and aberrant plasticity linked to disease. In Alzheimer’s disease, Aβ oligomers disrupt hippocampal neuronal plasticity and cognition. Sanderson et al. show how the postsynaptic scaffold protein AKAP150 coordinates PKA and Calcineurin regulation of Ca2+-permeable AMPA-type glutamate receptors to mediate disruption of synaptic plasticity by Aβ oligomers.
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Affiliation(s)
- Jennifer L Sanderson
- Department of Pharmacology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Ronald K Freund
- Department of Pharmacology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Jessica A Gorski
- Department of Pharmacology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Mark L Dell'Acqua
- Department of Pharmacology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, CO 80045, USA; University of Colorado Alzheimer's and Cognition Center, Anschutz Medical Campus, Aurora, CO 80045, USA; Linda Crnic Institute for Down Syndrome, Anschutz Medical Campus, Aurora, CO 80045, USA.
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Heinrich IA, Freitas AE, Wolin IAV, Nascimento APM, Walz R, Rodrigues ALS, Leal RB. Neuronal activity regulated pentraxin (narp) and GluA4 subunit of AMPA receptor may be targets for fluoxetine modulation. Metab Brain Dis 2021; 36:711-722. [PMID: 33528752 DOI: 10.1007/s11011-021-00675-x] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Accepted: 01/22/2021] [Indexed: 12/28/2022]
Abstract
Fluoxetine is the foremost prescribed antidepressant. Drugs acting on monoaminergic system may also regulate glutamatergic system. Indeed, the investigation of proteins associated with this system, such as Narp (neuronal activity-dependent pentraxin) and GluA4 subunit of AMPA receptor may reveal poorly explored modulations triggered by conventional antidepressants. This study aimed to uncover neurochemical mechanisms underlying the chronic fluoxetine treatment, mainly by evaluating these protein targets in the prefrontal cortex and in the hippocampus. Mice received a daily administration of fluoxetine (0.1, 1 or 10 mg/kg, p.o.) or potable water (vehicle group) for 21 days. These animals were submitted to the forced swim test (FST) to verify antidepressant-like responses and the open-field test (OFT) to assess locomotor activity. Modulation of signaling proteins was analyzed by western blot. Chronic treatment with fluoxetine (1 and 10 mg/kg) was effective, since it reduced the immobility time in the FST, without altering locomotor activity. Fluoxetine 10 mg/kg increased CREB phosphorylation and BDNF expression in the prefrontal cortex and hippocampus. Noteworthy, in the hippocampus fluoxetine also promoted Akt activation and augmented Narp expression. In the prefrontal cortex, a significant decrease in the expression of the GluA4 subunit and Narp were observed following fluoxetine administration (10 mg/kg). The results provide evidence of novel molecular targets potentially involved in the antidepressant effects of fluoxetine, since in mature rodents Narp and GluA4 are mainly expressed in the GABAergic parvalbumin-positive (PV+) interneurons. This may bring new insights into the molecular elements involved in the mechanisms underlying the antidepressant effects of fluoxetine.
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Affiliation(s)
- Isabella A Heinrich
- Graduate Program in Neuroscience, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
| | - Andiara E Freitas
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
- Graduate Program in Biochemistry, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
| | - Ingrid A V Wolin
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
- Graduate Program in Biochemistry, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
| | - Ana Paula M Nascimento
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
- Graduate Program in Biochemistry, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
| | - Roger Walz
- Graduate Program in Neuroscience, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
- Department of Clinical Medicine, Center of Health Sciences, University Hospital, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
- Center of Applied Neuroscience (CeNAp), University Hospital, Federal University of Santa Catarina, Florianópolis, 88040-900, SC, Brazil
| | - Ana Lúcia S Rodrigues
- Graduate Program in Neuroscience, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
- Graduate Program in Biochemistry, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
| | - Rodrigo B Leal
- Graduate Program in Neuroscience, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil.
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil.
- Graduate Program in Biochemistry, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil.
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Wheless J, Wechsler RT, Lancman M, Aboumatar S, Patten A, Malhotra M. Perampanel in real-world clinical care of patients with epilepsy: Interim analysis of a phase IV study. Epilepsia Open 2021; 6:79-89. [PMID: 33681651 PMCID: PMC7918328 DOI: 10.1002/epi4.12445] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 05/07/2020] [Revised: 10/19/2020] [Accepted: 11/07/2020] [Indexed: 11/20/2022] Open
Abstract
Objective To assess the retention rate, efficacy, safety, and dosing of perampanel administered to patients with epilepsy during routine clinical care in the retrospective phase IV, PROVE Study (NCT03208660). Methods Exposure, efficacy, and safety data were obtained from the medical records of patients initiating perampanel after January 1, 2014, across 29 US study sites. The cutoff date for this interim analysis was October 10, 2018. The primary efficacy endpoint was retention rate. Secondary efficacy endpoints included median percent changes in seizure frequency, seizure-freedom rate, and overall investigator impression of seizure effect. Results All enrolled patients (N = 1121) received perampanel. Mean (standard deviation [SD]) cumulative duration of exposure to perampanel was 16.6 (14.7) months; overall mean (SD) daily perampanel dose was 5.7 (2.7) mg. Perampanel uptitration occurred weekly (21.1%), biweekly (23.8%), every 3 weeks (1.5%), other (43.3%), and unknown (10.3%). Across the Safety Analysis Set (N = 1121), retention rate on perampanel at 24 months was 49.5% (n = 319/645).At 12 months, the median reduction in seizure frequency per 28 days from baseline in the small number of patients for whom data were available was 75.0% (n = 85), and 30/85 (35.3%) patients were seizure free. Based on investigator impression at the end of treatment, improvement, no change (ie, stable), or worsening of seizures was reported in 54.3%, 33.7%, and 12.0% of patients, respectively.Treatment-emergent adverse events occurred in 500 (44.6%) patients; the most common were dizziness (9.2%), aggression (5.4%), and irritability (4.5%). Serious treatment-emergent adverse events occurred in 32 (2.9%) patients. Significance Favorable retention and sustained efficacy were demonstrated for ≥12 months following initiation of perampanel during routine clinical care in patients with epilepsy.
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Affiliation(s)
- James Wheless
- University of Tennessee Health Science CenterLe Bonheur Children’s HospitalMemphisTNUSA
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Cisani F, Olivero G, Usai C, Van Camp G, Maccari S, Morley-Fletcher S, Pittaluga AM. Antibodies Against the NH 2-Terminus of the GluA Subunits Affect the AMPA-Evoked Releasing Activity: The Role of Complement. Front Immunol 2021; 12:586521. [PMID: 33717067 PMCID: PMC7952438 DOI: 10.3389/fimmu.2021.586521] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 01/15/2021] [Indexed: 01/31/2023] Open
Abstract
Antibodies recognizing the amino-terminal domain of receptor subunit proteins modify the receptor efficiency to controlling transmitter release in isolated nerve endings (e.g., synaptosomes) indirectly confirming their presence in these particles but also allowing to speculate on their subunit composition. Western blot analysis and confocal microscopy unveiled the presence of the GluA1, GluA2, GluA3, and GluA4 receptor subunits in cortical synaptosomes. Functional studies confirmed the presence of presynaptic release-regulating AMPA autoreceptors in these terminals, whose activation releases [3H]D-aspartate ([3H]D-Asp, here used as a marker of glutamate) in a NBQX-dependent manner. The AMPA autoreceptors traffic in a constitutive manner, since entrapping synaptosomes with the pep2-SVKI peptide (which interferes with the GluA2-GRIP1/PICK1 interaction) amplified the AMPA-evoked releasing activity, while the inactive pep2-SVKE peptide was devoid of activity. Incubation of synaptosomes with antibodies recognizing the NH2 terminus of the GluA2 and the GluA3 subunits increased, although to a different extent, the GluA2 and 3 densities in synaptosomal membranes, also amplifying the AMPA-evoked glutamate release in a NBQX-dependent fashion. We then analyzed the releasing activity of complement (1:300) from both treated and untreated synaptosomes and found that the complement-induced overflow occurred in a DL-t-BOA-sensitive, NBQX-insensitive fashion. We hypothesized that anti-GluA/GluA complexes in neuronal membranes could trigger the classic pathway of activation of the complement, modifying its releasing activity. Accordingly, the complement-evoked release of [3H]D-Asp from antiGluA2 and anti-GluA3 antibody treated synaptosomes was significantly increased when compared to untreated terminals and facilitation was prevented by omitting the C1q component of the immunocomplex. Antibodies recognizing the NH2 terminus of the GluA1 or the GluA4 subunits failed to affect both the AMPA and the complement-evoked tritium overflow. Our results suggest the presence of GluA2/GluA3-containing release-regulating AMPA autoreceptors in cortical synaptosomes. Incubation of synaptosomes with commercial anti-GluA2 or anti-GluA3 antibodies amplifies the AMPA-evoked exocytosis of glutamate through a complement-independent pathway, involving an excessive insertion of AMPA autoreceptors in plasma membranes but also affects the complement-dependent releasing activity, by promoting the classic pathway of activation of the immunocomplex. Both events could be relevant to the development of autoimmune diseases typified by an overproduction of anti-GluA subunits.
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Affiliation(s)
- Francesca Cisani
- Pharmacology and Toxicology Section, Department of Pharmacy, DIFAR, Genoa, Italy
| | - Guendalina Olivero
- Pharmacology and Toxicology Section, Department of Pharmacy, DIFAR, Genoa, Italy
| | - Cesare Usai
- Institute of Biophysics, National Research Council, Genoa, Italy
| | - Gilles Van Camp
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France
- International Associated Laboratory (LIA), “Prenatal Stress and Neurodegenerative Diseases”, University of Lille – CNRS, UGSF UMR 8576/Sapienza University of Rome and IRCCS Neuromed, Lille, France
| | - Stefania Maccari
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France
- International Associated Laboratory (LIA), “Prenatal Stress and Neurodegenerative Diseases”, University of Lille – CNRS, UGSF UMR 8576/Sapienza University of Rome and IRCCS Neuromed, Lille, France
- Department of Science and Medical - Surgical Biotechnology, University Sapienza of Rome, Rome, Italy
| | - Sara Morley-Fletcher
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France
- International Associated Laboratory (LIA), “Prenatal Stress and Neurodegenerative Diseases”, University of Lille – CNRS, UGSF UMR 8576/Sapienza University of Rome and IRCCS Neuromed, Lille, France
| | - Anna Maria Pittaluga
- Pharmacology and Toxicology Section, Department of Pharmacy, DIFAR, Genoa, Italy
- IRCCS San Martino Hospital, Genova, Italy
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Poplawsky AJ, Iordanova B, Vazquez AL, Kim SG, Fukuda M. Postsynaptic activity of inhibitory neurons evokes hemodynamic fMRI responses. Neuroimage 2021; 225:117457. [PMID: 33069862 PMCID: PMC7818351 DOI: 10.1016/j.neuroimage.2020.117457] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 09/15/2020] [Accepted: 10/12/2020] [Indexed: 02/08/2023] Open
Abstract
Functional MRI responses are localized to the synaptic sites of evoked inhibitory neurons, but it is unknown whether, or by what mechanisms, these neurons initiate functional hyperemia. Here, the neuronal origins of these hemodynamic responses were investigated by fMRI or local field potential and blood flow measurements during topical application of pharmacological agents when GABAergic granule cells in the rat olfactory bulb were synaptically targeted. First, to examine if postsynaptic activation of these inhibitory neurons was required for neurovascular coupling, we applied an NMDA receptor antagonist during cerebral blood volume-weighted fMRI acquisition and found that responses below the drug application site (up to ~1.5 mm) significantly decreased within ~30 min. Similarly, large decreases in granule cell postsynaptic activities and blood flow responses were observed when AMPA or NMDA receptor antagonists were applied. Second, inhibition of nitric oxide synthase preferentially decreased the initial, fast component of the blood flow response, while inhibitors of astrocyte-specific glutamate transporters and vasoactive intestinal peptide receptors did not decrease blood flow responses. Third, inhibition of GABA release with a presynaptic GABAB receptor agonist caused less reduction of neuronal and blood flow responses compared to the postsynaptic glutamate receptor antagonists. In conclusion, local hyperemia by synaptically-evoked inhibitory neurons was primarily driven by their postsynaptic activities, possibly through NMDA receptor-dependent calcium signaling that was not wholly dependent on nitric oxide.
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Affiliation(s)
| | - Bistra Iordanova
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15203, United States
| | - Alberto L Vazquez
- Department of Radiology, University of Pittsburgh, Pittsburgh, PA 15203, United States; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15203, United States
| | - Seong-Gi Kim
- Center for Neuroscience Imaging Research, Institute for Basic Science, Suwon 440-330, Korea; Department of Biomedical Engineering, Sungkyunkwan University, Suwon, 440-330, Korea
| | - Mitsuhiro Fukuda
- Department of Radiology, University of Pittsburgh, Pittsburgh, PA 15203, United States.
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Kim JE, Lee DS, Park H, Kang TC. Src/CK2/PTEN-Mediated GluN2B and CREB Dephosphorylations Regulate the Responsiveness to AMPA Receptor Antagonists in Chronic Epilepsy Rats. Int J Mol Sci 2020; 21:E9633. [PMID: 33348808 PMCID: PMC7766850 DOI: 10.3390/ijms21249633] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 12/11/2020] [Accepted: 12/12/2020] [Indexed: 12/30/2022] Open
Abstract
Both α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid receptor (AMPAR) and N-methyl-D-aspartate receptor (NMDAR) have been reported as targets for treatment of epilepsy. To investigate the roles and interactions of AMPAR and NMDAR in ictogenesis of epileptic hippocampus, we analyzed AMPAR antagonists (perampanel and GYKI 52466)-mediated phosphatase and tensin homolog deleted on chromosome 10 (PTEN) regulation and glutamate ionotropic receptor NMDA type subunit 2B (GluN2B) tyrosine (Y) 1472 phosphorylation in epilepsy rats. Both perampanel and GYKI 52466 increased PTEN expression and its activity (reduced phosphorylation), concomitant with decreased activities (phosphorylations) of Src family-casein kinase 2 (CK2) signaling pathway. Compatible with these, they also restored the upregulated GluN2B Y1472 and Ca2+/cAMP response element-binding protein (CREB) serine (S) 133 phosphorylations and surface expression of glutamate ionotropic receptor AMPA type subunit 1 (GRIA1) to basal level in the epileptic hippocampus. These effects of perampanel and GYKI 52466 are observed in responders (whose seizure activities are responsive to AMPAR antagonists), but not non-responders (whose seizure activities were uncontrolled by AMPAR antagonists). Therefore, our findings suggest that Src/CK2/PTEN-mediated GluN2B Y1472 and CREB S133 regulations may be one of the responsible signaling pathways for the generation of refractory seizures in non-responders to AMPAR antagonists.
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Affiliation(s)
- Ji-Eun Kim
- Department of Anatomy and Neurobiology, College of Medicine, Hallym University, Chuncheon 24252, Korea; (J.-E.K.); (D.-S.L.); (H.P.)
- Institute of Epilepsy Research, College of Medicine, Hallym University, Chuncheon 24252, Korea
| | - Duk-Shin Lee
- Department of Anatomy and Neurobiology, College of Medicine, Hallym University, Chuncheon 24252, Korea; (J.-E.K.); (D.-S.L.); (H.P.)
- Institute of Epilepsy Research, College of Medicine, Hallym University, Chuncheon 24252, Korea
| | - Hana Park
- Department of Anatomy and Neurobiology, College of Medicine, Hallym University, Chuncheon 24252, Korea; (J.-E.K.); (D.-S.L.); (H.P.)
- Institute of Epilepsy Research, College of Medicine, Hallym University, Chuncheon 24252, Korea
| | - Tae-Cheon Kang
- Department of Anatomy and Neurobiology, College of Medicine, Hallym University, Chuncheon 24252, Korea; (J.-E.K.); (D.-S.L.); (H.P.)
- Institute of Epilepsy Research, College of Medicine, Hallym University, Chuncheon 24252, Korea
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12
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Kim JE, Park H, Lee JE, Kim TH, Kang TC. PTEN Is Required for The Anti-Epileptic Effects of AMPA Receptor Antagonists in Chronic Epileptic Rats. Int J Mol Sci 2020; 21:ijms21165643. [PMID: 32781725 PMCID: PMC7460838 DOI: 10.3390/ijms21165643] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 08/05/2020] [Accepted: 08/05/2020] [Indexed: 01/13/2023] Open
Abstract
α-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR) is one of the ligand-gated ion channels for glutamate, which is an important player in the generation and spread of seizures. The efficacy of AMPAR functionality is regulated by the trafficking, synaptic targeting, and phosphorylation. Paradoxically, AMPAR expression and its phosphorylation level are decreased in the epileptic hippocampus. Therefore, the roles of AMPAR in seizure onset and neuronal hyperexcitability in ictogenesis remain to be elucidated. In the present study, we found that AMPAR antagonists (perampanel and GYKI 52466) decreased glutamate ionotropic receptor AMPA type subunit 1 (GRIA1) surface expression in the epileptic rat hippocampus. They also upregulated phosphatase and tensin homolog deleted on chromosome 10 (PTEN) expression and restored to basal levels the upregulated phosphoinositide 3-kinase (PI3K)/AKT1 phosphorylations. Dipotassium bisperoxovanadium(pic) dihydrate (BpV(pic), a PTEN inhibitor) co-treatment abolished the anti-epileptic effects of perampanel and GYKI 52466. Therefore, our findings suggest that PTEN may be required for the anti-epileptic effects of AMPAR antagonists.
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Affiliation(s)
- Ji-Eun Kim
- Department of Anatomy and Neurobiology, College of Medicine, Hallym University, Chuncheon 24252, Korea
- Institute of Epilepsy Research, College of Medicine, Hallym University, Chuncheon 24252, Korea
| | - Hana Park
- Department of Anatomy and Neurobiology, College of Medicine, Hallym University, Chuncheon 24252, Korea
- Institute of Epilepsy Research, College of Medicine, Hallym University, Chuncheon 24252, Korea
| | - Ji-Eun Lee
- Department of Anatomy and Neurobiology, College of Medicine, Hallym University, Chuncheon 24252, Korea
- Institute of Epilepsy Research, College of Medicine, Hallym University, Chuncheon 24252, Korea
| | - Tae-Hyun Kim
- Department of Anatomy and Neurobiology, College of Medicine, Hallym University, Chuncheon 24252, Korea
- Institute of Epilepsy Research, College of Medicine, Hallym University, Chuncheon 24252, Korea
| | - Tae-Cheon Kang
- Department of Anatomy and Neurobiology, College of Medicine, Hallym University, Chuncheon 24252, Korea
- Institute of Epilepsy Research, College of Medicine, Hallym University, Chuncheon 24252, Korea
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13
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Lin J, Zhang X, Li C, Zhang Y, Lu H, Chen J, Li Z, Yang X, Wu Z. Evodiamine via targeting nNOS and AMPA receptor GluA1 inhibits nitroglycerin-induced migraine-like response. J Ethnopharmacol 2020; 254:112727. [PMID: 32147481 DOI: 10.1016/j.jep.2020.112727] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 02/27/2020] [Accepted: 02/28/2020] [Indexed: 06/10/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Evodiamine (EVO) is a natural compound derived from Tetradium ruticarpum (A.Juss.) T.G.Hartley used to treat pain and migraine in traditional Chinese medicine. EVO is the primary active ingredient of Tetradium ruticarpum. However, the preventive effect of EVO against migraine remains unexplored. AIM OF THE STUDY To investigate the preventive effect of EVO against nitroglycerin (NTG)-induced acute migraine in rats. MATERIALS AND METHODS Male Sprague-Dawley rats were intragastrically administered EVO (45 or 90 mg/kg) for nine days. To establish an acute migraine model, we subcutaneously injected rats with a 10 mg/kg NTG solution. The migraine-like behavior of the rats was evaluated via the formalin test and the warm water tail-withdrawal assay. The periaqueductal gray (PAG) and serum samples were collected from the rats and used to determine the effect of EVO on the levels of serum nitric oxide (NO), CGRP, c-Fos, neuronal nitric oxide synthase (nNOS), inducible nitric oxide synthase (iNOS) and the α-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid (AMPA) receptor GluA1. RESULTS The formalin test and the warm water tail-withdrawal assay showed that EVO inhibited the licking foot/shaking response and reversed the shortened tail-withdrawal latency in NTG-treated rats. Additionally, EVO suppressed serum NO levels and reduced the mRNA/protein expression of c-Fos and nNOS, but not iNOS, in the PAG. Furthermore, EVO suppressed total protein expression of the AMPA receptor GluA1 and its phosphorylation at Ser831 and Ser845. CONCLUSIONS This study showed that EVO inhibits the migraine-like pain response and that this beneficial effect might be attributed to the regulation of nNOS and suppression of the AMPA receptor GluA1. We suggest that EVO has the potential to treat migraine as a lead compound of natural origin.
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Affiliation(s)
- Jiacheng Lin
- School of Basic Medicine Science, Shanghai University of Traditional Chinese Medicine, 1200, Cailun Road, Shanghai, China
| | - Xu Zhang
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, 1200, Cailun Road, Shanghai, China
| | - Chaotong Li
- School of Basic Medicine Science, Shanghai University of Traditional Chinese Medicine, 1200, Cailun Road, Shanghai, China
| | - Yingyan Zhang
- School of Basic Medicine Science, Shanghai University of Traditional Chinese Medicine, 1200, Cailun Road, Shanghai, China
| | - Hanzhi Lu
- School of Basic Medicine Science, Shanghai University of Traditional Chinese Medicine, 1200, Cailun Road, Shanghai, China
| | - Jiwei Chen
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, 1200, Cailun Road, Shanghai, China
| | - Zeyu Li
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, 1200, Cailun Road, Shanghai, China
| | - Xuejun Yang
- Institute of Nephrology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, 528 Zhangheng Road, Shanghai, China.
| | - Zhongping Wu
- School of Basic Medicine Science, Shanghai University of Traditional Chinese Medicine, 1200, Cailun Road, Shanghai, China.
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14
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Jiang L, Zhang H, Zhou J, Tang X, Luo L, Huang P, Yi W, Xu N, Liu J, Fu W. Involvement of Hippocampal AMPA Receptors in Electroacupuncture Attenuating Depressive-Like Behaviors and Regulating Synaptic Proteins in Rats Subjected to Chronic Unpredictable Mild Stress. World Neurosurg 2020; 139:e455-e462. [PMID: 32311563 DOI: 10.1016/j.wneu.2020.04.042] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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: 01/06/2020] [Accepted: 04/06/2020] [Indexed: 12/25/2022]
Abstract
OBJECTIVE A large body of evidence has suggested that the disruptions of neural plasticity in the brain play a pivotal role in major depressive disorder (MDD). Electroacupuncture (EA) therapy has been shown to be an effective treatment modality for MDD. However, the mechanism underling the antidepressive effect of EA treatment has not been clearly elucidated. This study aimed to investigate the antidepressant-like effects of EA associated with its protection effect of synaptic structural plasticity. METHODS An MDD model was induced by exposing Sprague Dawley rats to chronic unpredictable mild stress (CUMS). EA stimulation (Hegu and Taichong) and AMPA receptor (AMPAR) antagonist NBQX intrahippocampal injection were used to treat the depressed rats. RESULTS We found EA improved behavioral performance, enhanced synaptic structural plasticity, and upregulated gene and protein levels of GluR1, GluR2, Stargazin, Pick1, SYP, PSD-95, and GAP-43. AMPAR antagonist NBQX had the opposite effect on behavioral performance, synaptic plasticity, and the aforementioned genes and proteins. CONCLUSIONS These results suggest that EA has a potent antidepressant effect, likely through upregulated expression of the AMPAR and protected neural plasticity in CUMS-treated rats.
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Affiliation(s)
- Li Jiang
- Department of Acupuncture and Moxibustion, The Second Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou, Guangdong, China; Acupuncture Research Team, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Hao Zhang
- Acupuncture Research Team, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Junhe Zhou
- Department of Acupuncture and Moxibustion, The Second Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou, Guangdong, China
| | - Xiaorong Tang
- South China Research Center for Acupuncture and Moxibustion, Medical College of Acu-Moxi and Rehabilitation, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Le Luo
- South China Research Center for Acupuncture and Moxibustion, Medical College of Acu-Moxi and Rehabilitation, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Peidong Huang
- South China Research Center for Acupuncture and Moxibustion, Medical College of Acu-Moxi and Rehabilitation, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Wei Yi
- South China Research Center for Acupuncture and Moxibustion, Medical College of Acu-Moxi and Rehabilitation, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Nenggui Xu
- South China Research Center for Acupuncture and Moxibustion, Medical College of Acu-Moxi and Rehabilitation, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Jianhua Liu
- Acupuncture Research Team, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Wenbin Fu
- Department of Acupuncture and Moxibustion, The Second Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou, Guangdong, China.
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15
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Dannenhoffer CA, Spear LP. Excitatory/inhibitory balance across ontogeny contributes to age-specific behavioral outcomes of ethanol-like challenge in conditioned taste aversion. Dev Psychobiol 2019; 61:1157-1167. [PMID: 31087376 PMCID: PMC7685222 DOI: 10.1002/dev.21864] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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: 01/10/2019] [Revised: 04/01/2019] [Accepted: 04/08/2019] [Indexed: 12/15/2022]
Abstract
Adolescent-typical sensitivities to ethanol (EtOH) are characterized in part by reduced sensitivity to EtOH's aversive effects. Rodent studies have shown that adolescents are less sensitive than adults to aversive properties of EtOH in a conditioned taste aversion (CTA) paradigm. To the extent that EtOH exerts antagonist-like actions upon glutamate receptors and/or agonist-like actions upon γ-aminobutyric acid (GABA) receptors, age differences in excitatory/inhibitory balance may regulate age-specific EtOH sensitivities, such as attenuated sensitivity of adolescents to EtOH aversion. In our experiments, adolescent and adult Sprague-Dawley rats were tested for CTA following challenge with one of the following pharmacological agents: glutamatergic AMPA1 receptor antagonist NBQX, glutamatergic N-methyl-d-aspartate NR2B receptor antagonist ifenprodil, and extrasynaptic GABAA receptor agonist THIP to determine whether these induced age-specific aversive sensitivities like those seen with EtOH. NBQX administration did not induce CTA. The highest dose of extrasynaptic GABAA agonist THIP induced CTA in adolescents but not adults, an opposite ontogenetic profile as seen following EtOH. Ifenprodil exerted an age-specific pattern of CTA similar to that seen with EtOH in males, with adolescents being insensitive to ifenprodil's aversive effects relative to adults. Thus, only antagonism of NR2B receptors in male rats mimicked age-specific sensitivities to the aversive effects of EtOH.
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Affiliation(s)
- Carol A Dannenhoffer
- Neurobiology of Adolescent Drinking in Adulthood Consortium (NADIA), Center for Development and Behavioral Neuroscience, Department of Psychology, Binghamton University, Binghamton, New York
| | - Linda P Spear
- Neurobiology of Adolescent Drinking in Adulthood Consortium (NADIA), Center for Development and Behavioral Neuroscience, Department of Psychology, Binghamton University, Binghamton, New York
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16
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Liu LL, Alessio EJ, Spix NJ, Zhang DQ. Expression of GluA2-containing calcium-impermeable AMPA receptors on dopaminergic amacrine cells in the mouse retina. Mol Vis 2019; 25:780-790. [PMID: 31819340 PMCID: PMC6882663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Accepted: 11/17/2019] [Indexed: 11/18/2022] Open
Abstract
Purpose The neuromodulator dopamine plays an important role in light adaptation for the visual system. Light can stimulate dopamine release from dopaminergic amacrine cells (DACs) by activating three classes of photosensitive retinal cells: rods, cones, and melanopsin-expressing intrinsically photosensitive retinal ganglion cells (ipRGCs). However, the synaptic mechanisms by which these photoreceptors excite DACs remain poorly understood. Our previous work demonstrated that α-amino-3-hydroxyl-5-methyl-4-isoxazole-propionate (AMPA) receptors contribute to light regulation of DAC activity. AMPA receptors are classified into Ca2+-permeable and Ca2+-impermeable subtypes. We sought to identify which subtype of AMPA receptors is involved in light regulation of DAC activity. Methods AMPA receptor-mediated light responses and miniature excitatory postsynaptic currents were recorded from genetically labeled DACs in mouse retinas with the whole-cell voltage-clamp mode. Immunostaining with antibodies against tyrosine hydroxylase, GluA2 (GluR2), and PSD-95 was performed in vertical retinal slices. Results The biophysical and pharmacological data showed that only Ca2+-impermeable AMPA receptors contribute to DAC light responses driven by ipRGCs or cones (via depolarizing bipolar cells). We further found that the same subtype of AMPA receptors mediates miniature excitatory postsynaptic currents of DACs. These findings are supported by the immunohistochemical results demonstrating that DACs express the PSD-95 with GluA2, a subunit that is essential for determining the impermeability of AMPA receptors to calcium. Conclusions The results indicated that GluA2-containing Ca2+-impermeable AMPA receptors contribute to signal transmission from photosensitive retinal cells to DACs.
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Affiliation(s)
- Lei-Lei Liu
- Eye Research Institute, Oakland University, Rochester, MI
| | | | - Nathan J Spix
- Eye Research Institute, Oakland University, Rochester, MI
| | - Dao-Qi Zhang
- Eye Research Institute, Oakland University, Rochester, MI
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17
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Sun H, Takesian AE, Wang TT, Lippman-Bell JJ, Hensch TK, Jensen FE. Early Seizures Prematurely Unsilence Auditory Synapses to Disrupt Thalamocortical Critical Period Plasticity. Cell Rep 2019; 23:2533-2540. [PMID: 29847785 PMCID: PMC6446922 DOI: 10.1016/j.celrep.2018.04.108] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 01/02/2018] [Accepted: 04/25/2018] [Indexed: 12/31/2022] Open
Abstract
Heightened neural excitability in infancy and childhood results in increased susceptibility to seizures. Such early-life seizures are associated with language deficits and autism that can result from aberrant development of the auditory cortex. Here, we show that early-life seizures disrupt a critical period (CP) for tonotopic map plasticity in primary auditory cortex (A1). We show that this CP is characterized by a prevalence of “silent,” NMDA-receptor (NMDAR)-only, glutamate receptor synapses in auditory cortex that become “unsilenced” due to activity-dependent AMPA receptor (AMPAR) insertion. Induction of seizures prior to this CP occludes tonotopic map plasticity by prematurely unsilencing NMDAR-only synapses. Further, brief treatment with the AMPAR antagonist NBQX following seizures, prior to the CP, prevents synapse unsilencing and permits subsequent A1 plasticity. These findings reveal that early-life seizures modify CP regulators and suggest that therapeutic targets for early post-seizure treatment can rescue CP plasticity.
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Affiliation(s)
- Hongyu Sun
- Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Neuroscience, Carleton University, Ottawa, ON K1S 5B6, Canada
| | - Anne E Takesian
- F.M. Kirby Neurobiology Center, Department of Neurology, Boston Children's Hospital, Harvard Medical School, 300 Longwood Ave., Boston, MA 02115, USA
| | - Ting Ting Wang
- Department of Neuroscience, Carleton University, Ottawa, ON K1S 5B6, Canada
| | - Jocelyn J Lippman-Bell
- Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Takao K Hensch
- F.M. Kirby Neurobiology Center, Department of Neurology, Boston Children's Hospital, Harvard Medical School, 300 Longwood Ave., Boston, MA 02115, USA; Center for Brain Science, Department of Molecular & Cellular Biology, Harvard University, 52 Oxford St., Cambridge, MA 02138, USA.
| | - Frances E Jensen
- Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
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Toomey LM, Bartlett CA, Gavriel N, McGonigle T, Majimbi M, Gopalasingam G, Rodger J, Fitzgerald M. Comparing modes of delivery of a combination of ion channel inhibitors for limiting secondary degeneration following partial optic nerve transection. Sci Rep 2019; 9:15297. [PMID: 31653948 PMCID: PMC6814709 DOI: 10.1038/s41598-019-51886-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Accepted: 10/07/2019] [Indexed: 11/28/2022] Open
Abstract
Injury to the central nervous system is exacerbated by secondary degeneration. Previous research has shown that a combination of orally and locally administered ion channel inhibitors following partial optic nerve injury protects the myelin sheath and preserves function in the ventral optic nerve, vulnerable to secondary degeneration. However, local administration is often not clinically appropriate. This study aimed to compare the efficacy of systemic and local delivery of the ion channel inhibitor combination of lomerizine, brilliant blue G (BBG) and YM872, which inhibits voltage-gated calcium channels, P2X7 receptors and Ca2+ permeable α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors respectively. Following a partial optic nerve transection, adult female PVG rats were treated with BBG and YM872 delivered via osmotic mini pump directly to the injury site, or via intraperitoneal injection, both alongside oral administration of lomerizine. Myelin structure was preserved with both delivery modes of the ion channel inhibitor combination. However, there was no effect of treatment on inflammation, either peripherally or at the injury site, or on the density of oligodendroglial cells. Taken together, the data indicate that even at lower concentrations, the combinatorial treatment may be preserving myelin structure, and that systemic and local delivery are comparable at improving outcomes following neurotrauma.
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Affiliation(s)
- Lillian M Toomey
- Experimental and Regenerative Neurosciences, School of Biological Sciences, The University of Western Australia, 35 Stirling Hwy, Perth, 6009, Western Australia, Australia
- Curtin Health Innovation Research Institute, Curtin University, Sarich Neuroscience Research Institute Building, 8 Verdun St, Nedlands, 6009, Western Australia, Australia
- Perron Institute for Neurological and Translational Science, Sarich Neuroscience Research Institute Building, 8 Verdun St, Nedlands, 6009, Western Australia, Australia
| | - Carole A Bartlett
- Experimental and Regenerative Neurosciences, School of Biological Sciences, The University of Western Australia, 35 Stirling Hwy, Perth, 6009, Western Australia, Australia
| | - Nikolas Gavriel
- Experimental and Regenerative Neurosciences, School of Biological Sciences, The University of Western Australia, 35 Stirling Hwy, Perth, 6009, Western Australia, Australia
| | - Terence McGonigle
- Curtin Health Innovation Research Institute, Curtin University, Sarich Neuroscience Research Institute Building, 8 Verdun St, Nedlands, 6009, Western Australia, Australia
| | - Maimuna Majimbi
- Curtin Health Innovation Research Institute, Curtin University, Sarich Neuroscience Research Institute Building, 8 Verdun St, Nedlands, 6009, Western Australia, Australia
| | - Gopana Gopalasingam
- Experimental and Regenerative Neurosciences, School of Biological Sciences, The University of Western Australia, 35 Stirling Hwy, Perth, 6009, Western Australia, Australia
| | - Jennifer Rodger
- Experimental and Regenerative Neurosciences, School of Biological Sciences, The University of Western Australia, 35 Stirling Hwy, Perth, 6009, Western Australia, Australia
- Perron Institute for Neurological and Translational Science, Sarich Neuroscience Research Institute Building, 8 Verdun St, Nedlands, 6009, Western Australia, Australia
| | - Melinda Fitzgerald
- Experimental and Regenerative Neurosciences, School of Biological Sciences, The University of Western Australia, 35 Stirling Hwy, Perth, 6009, Western Australia, Australia.
- Curtin Health Innovation Research Institute, Curtin University, Sarich Neuroscience Research Institute Building, 8 Verdun St, Nedlands, 6009, Western Australia, Australia.
- Perron Institute for Neurological and Translational Science, Sarich Neuroscience Research Institute Building, 8 Verdun St, Nedlands, 6009, Western Australia, Australia.
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Qneibi M, Hamed O, Natsheh AR, Fares O, Jaradat N, Emwas N, AbuHasan Q, Al-Kerm R, Al-Kerm R. Inhibition and assessment of the biophysical gating properties of GluA2 and GluA2/A3 AMPA receptors using curcumin derivatives. PLoS One 2019; 14:e0221132. [PMID: 31454362 PMCID: PMC6711591 DOI: 10.1371/journal.pone.0221132] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 07/30/2019] [Indexed: 12/16/2022] Open
Abstract
The development of efficacious and safe drugs for the treatment of neurological diseases related to glutamate toxicity has been a focus in neuropharmacological research. Specifically, discovering antagonists to modulate the activity and kinetics of AMPA receptors, which are the fastest ligand-gated ion channels involved in excitatory neurotransmission in response to glutamate. Thus, the current study investigated novel curcumin derivatives on the biophysical properties of AMPA receptors, specifically on the homomeric GluA2 and the heteromeric GluA2/A3 subunits and assessed for inhibitory actions. The biophysical parameter (i.e., desensitization, deactivation, and peak currents) were measured by using whole-cell patch clamp electrophysiology with and without the administration of the derivatives onto HEK293 cells. CR-NN, CR-NNPh, CR-MeNH, and CR-NO of the tested derivatives showed inhibition on all AMPA receptors up to 6 folds. Moreover, the inhibitory derivatives also increased desensitization and deactivation, which further intensifies the compounds' neuroprotective effects. However, CR-PhCl, CR-PhF, and CR-PhBr did not show any significant changes on the peak current, deactivation or desensitization rates. By comparison to other discovered and widely used antagonist, the prepared curcumin derivatives are not selective to a specific AMPA subunit, instead implement its effect in the same way between all types of AMPA receptors. Additionally, the obtained results provide derivatives that not only noncompetitively inhibit AMPARs but also decrease its biophysical kinetics, specifically desensitization and deactivation rates. Hence, to potentially serve as a new AMPAR inhibitor with therapeutic potential, the current study provides compounds that are non-selective and non-competitive antagonist, which also effect the desensitization and deactivation rates of the receptor.
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Affiliation(s)
- Mohammad Qneibi
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, Palestine
| | - Othman Hamed
- Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
| | - Abdel-Razzak Natsheh
- Department of Computer Information Systems, Faculty of Engineering and Information Technology, An-Najah National University, Nablus, Palestine
| | - Oswa Fares
- Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
| | - Nidal Jaradat
- Department of Pharmacy, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, Palestine
| | - Nour Emwas
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, Palestine
| | - Qais AbuHasan
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, Palestine
| | - Rana Al-Kerm
- Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
| | - Rola Al-Kerm
- Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
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20
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Lange F, Weßlau K, Porath K, Hörnschemeyer MF, Bergner C, Krause BJ, Mullins CS, Linnebacher M, Köhling R, Kirschstein T. AMPA receptor antagonist perampanel affects glioblastoma cell growth and glutamate release in vitro. PLoS One 2019; 14:e0211644. [PMID: 30716120 PMCID: PMC6361447 DOI: 10.1371/journal.pone.0211644] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 01/17/2019] [Indexed: 12/17/2022] Open
Abstract
Epileptic seizures are frequent in patients with glioblastoma, and anticonvulsive treatment is often necessary. While clinical guidelines recommend all approved anticonvulsants, so far it is still unclear which of the available drugs is the best therapeutic option for treating glioma-associated seizures, also in view of possible anti-tumorigenic effects. In our study, we employed four patient-derived low-passage cell lines of glioblastoma and three cell lines of brain metastases, and challenged these cultures with four anticonvulsants with different mechanisms of action: levetiracetam, valproic acid, carbamazepine and perampanel. Cell proliferation was determined by bromodeoxyuridine incorporation. To further analyze the effects of perampanel, apoptosis induction was measured by caspase 3/7 activation. Glutamate release was quantified and glucose uptake was determined using 18F-fluorodeoxyglucose. Real-time polymerase chain reaction was employed to assess the expression of genes associated with glutamate release and uptake in brain tumor cells. Of the four anticonvulsants, only perampanel showed systematic inhibitory effects on cell proliferation, whereas all other anticonvulsants failed to inhibit glioma and metastasis cell growth in vitro. Metastasis cells were much more resistant to perampanel than glioblastoma cell lines. Glucose uptake was attenuated in all glioblastoma cells after perampanel exposure, whereas cell death via apoptosis was not induced. Extracellular glutamate levels were found to be significantly higher in glioblastoma cell lines as compared to metastasis cell lines, but could be reduced by perampanel exposure. Incubation with perampanel up-regulated glutamine synthetase expression in glioblastoma cells, whereas treatment with valproic acid and levetiracetam downregulated excitatory amino acid transporter-2 expression. Overall, our data suggest that perampanel acts as an anticonvulsive drug and additionally mediated anti-tumorigenic effects.
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Affiliation(s)
- Falko Lange
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
- Center for Transdisciplinary Neurosciences Rostock, University of Rostock, Rostock, Germany
| | - Konrad Weßlau
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
| | - Katrin Porath
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
| | | | - Carina Bergner
- Department of Nuclear Medicine, Rostock University Medical Center, Rostock, Germany
| | - Bernd Joachim Krause
- Center for Transdisciplinary Neurosciences Rostock, University of Rostock, Rostock, Germany
- Department of Nuclear Medicine, Rostock University Medical Center, Rostock, Germany
| | | | | | - Rüdiger Köhling
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
- Center for Transdisciplinary Neurosciences Rostock, University of Rostock, Rostock, Germany
| | - Timo Kirschstein
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
- Center for Transdisciplinary Neurosciences Rostock, University of Rostock, Rostock, Germany
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21
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Taylor BK, Sinha GP, Donahue RR, Grachen CM, Morón JA, Doolen S. Opioid receptors inhibit the spinal AMPA receptor Ca 2+ permeability that mediates latent pain sensitization. Exp Neurol 2019; 314:58-66. [PMID: 30660616 DOI: 10.1016/j.expneurol.2019.01.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [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: 10/09/2018] [Revised: 12/24/2018] [Accepted: 01/05/2019] [Indexed: 01/02/2023]
Abstract
Acute inflammation induces sensitization of nociceptive neurons and triggers the accumulation of calcium permeable (CP) α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptors (AMPARs) in the dorsal horn of the spinal cord. This coincides with behavioral signs of acute inflammatory pain, but whether CP-AMPARs contribute to chronic pain remains unclear. To evaluate this question, we first constructed current-voltage (IV) curves of C-fiber stimulus-evoked, AMPAR-mediated EPSCs in lamina II to test for inward rectification, a key characteristic of CP-AMPARs. We found that the intraplantar injection of complete Freund's adjuvant (CFA) induced an inward rectification at 3 d that persisted to 21 d after injury. Furthermore, the CP- AMPAR antagonist IEM-1460 (50 μM) inhibited AMPAR-evoked Ca2+ transients 21d after injury but had no effect in uninflamed mice. We then used a model of long-lasting vulnerability for chronic pain that is determined by the balance between latent central sensitization (LCS) and mu opioid receptor constitutive activity (MORCA). When administered 21 d after the intraplantar injection of CFA, intrathecal administration of the MORCA inverse agonist naltrexone (NTX, 1 μg, i.t.) reinstated mechanical hypersensitivity, and superfusion of spinal cord slices with NTX (10 μM) increased the peak amplitude of AMPAR-evoked Ca2+ transients in lamina II neurons. The CP-AMPAR antagonist naspm (0-10 nmol, i.t.) inhibited these NTX-induced increases in mechanical hypersensitivity. NTX had no effect in uninflamed mice. Subsequent western blot analysis of the postsynaptic density membrane fraction from lumbar dorsal horn revealed that CFA increased GluA1 expression at 2 d and GluA4 expression at both 2 and 21 d post-injury, indicating that not just the GluA1 subunit, but also the GluA4 subunit, contributes to the expression of CP-AMPARs and synaptic strength during hyperalgesia. GluA2 expression increased at 21 d, an unexpected result that requires further study. We conclude that after tissue injury, dorsal horn AMPARs retain a Ca2+ permeability that underlies LCS. Because of their effectiveness in reducing naltrexone-induced reinstatement of hyperalgesia and potentiation of AMPAR-evoked Ca2+ signals, CP-AMPAR inhibitors are a promising class of agents for the treatment of chronic inflammatory pain.
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Affiliation(s)
- Bradley K Taylor
- Department of Anesthesiology, Pittsburgh Center for Pain Research, University of Pittsburgh School of Medicine, 200 Lothrop St. Pittsburgh, PA 15213, USA; Department of Physiology, University of Kentucky School of Medicine, 800 Rose, St. Lexington, KY 40536-0298, USA.
| | - Ghanshyam P Sinha
- Department of Anesthesiology, Pittsburgh Center for Pain Research, University of Pittsburgh School of Medicine, 200 Lothrop St. Pittsburgh, PA 15213, USA; Department of Physiology, University of Kentucky School of Medicine, 800 Rose, St. Lexington, KY 40536-0298, USA.
| | - Renee R Donahue
- Department of Physiology, University of Kentucky School of Medicine, 800 Rose, St. Lexington, KY 40536-0298, USA.
| | - Carolyn M Grachen
- Department of Anesthesiology, Pittsburgh Center for Pain Research, University of Pittsburgh School of Medicine, 200 Lothrop St. Pittsburgh, PA 15213, USA; Department of Physiology, University of Kentucky School of Medicine, 800 Rose, St. Lexington, KY 40536-0298, USA.
| | - Jose A Morón
- Department of Anesthesiology, Washington University Pain Center, Washington University School of Medicine, 600 South Euclid, St Louis, MO 63110, USA.
| | - Suzanne Doolen
- Department of Anesthesiology, Pittsburgh Center for Pain Research, University of Pittsburgh School of Medicine, 200 Lothrop St. Pittsburgh, PA 15213, USA; Department of Physiology, University of Kentucky School of Medicine, 800 Rose, St. Lexington, KY 40536-0298, USA.
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22
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Lee JLC, Amorim FE, Cassini LF, Amaral OB. Different temporal windows for CB1 receptor involvement in contextual fear memory destabilisation in the amygdala and hippocampus. PLoS One 2019; 14:e0205781. [PMID: 30645588 PMCID: PMC6333379 DOI: 10.1371/journal.pone.0205781] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [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: 09/27/2018] [Accepted: 12/26/2018] [Indexed: 12/24/2022] Open
Abstract
Reconsolidation is a process in which re-exposure to a reminder causes a previously acquired memory to undergo a process of destabilisation followed by subsequent restabilisation. Different molecular mechanisms have been postulated for destabilisation in the amygdala and hippocampus, including CB1 receptor activation, protein degradation and AMPA receptor exchange; however, most of the amygdala studies have used pre-reexposure interventions, while those in the hippocampus have usually performed them after reexposure. To test whether the temporal window for destabilisation is similar across both structures, we trained Lister Hooded rats in a contextual fear conditioning task, and 1 day later performed memory reexposure followed by injection of either the NMDA antagonist MK-801 (0.1 mg/kg) or saline in order to block reconsolidation. In parallel, we also performed local injections of either the CB1 antagonist SR141716A or its vehicle in the hippocampus or in the amygdala, either immediately before or immediately after reactivation. Infusion of SR141716A in the hippocampus prevented the reconsolidation-blocking effect of MK-801 when performed after reexposure, but not before it. In the amygdala, meanwhile, pre-reexposure infusions of SR141716A impaired reconsolidation blockade by MK-801, although the time-dependency of this effect was not as clear as in the hippocampus. Our results suggest the temporal windows for CB1-receptor-mediated memory destabilisation during reconsolidation vary between brain structures. Whether this reflects different time windows for engagement of these structures or different roles played by CB1 receptors in destabilisation across structures remains an open question for future studies.
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MESH Headings
- Amygdala/drug effects
- Amygdala/physiology
- Animals
- Behavior, Animal/drug effects
- Behavior, Animal/physiology
- Cannabinoid Receptor Antagonists/administration & dosage
- Conditioning, Classical/drug effects
- Dizocilpine Maleate/administration & dosage
- Excitatory Amino Acid Antagonists/administration & dosage
- Fear/drug effects
- Fear/physiology
- Hippocampus/drug effects
- Hippocampus/physiology
- Male
- Memory/drug effects
- Memory/physiology
- Models, Animal
- Rats
- Receptor, Cannabinoid, CB1/antagonists & inhibitors
- Receptor, Cannabinoid, CB1/metabolism
- Receptors, AMPA/antagonists & inhibitors
- Receptors, AMPA/metabolism
- Rimonabant/administration & dosage
- Time Factors
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Affiliation(s)
- Jonathan L. C. Lee
- University of Birmingham, School of Psychology, Edgbaston, Birmingham, United Kingdom
- * E-mail:
| | - Felippe E. Amorim
- Institute of Medical Biochemistry Leopoldo de Meis, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Lindsey F. Cassini
- University of Birmingham, School of Psychology, Edgbaston, Birmingham, United Kingdom
| | - Olavo B. Amaral
- Institute of Medical Biochemistry Leopoldo de Meis, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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23
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Blakemore LJ, Corthell JT, Trombley PQ. Kainate Receptors Play a Role in Modulating Synaptic Transmission in the Olfactory Bulb. Neuroscience 2018; 391:25-49. [PMID: 30213766 DOI: 10.1016/j.neuroscience.2018.09.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 08/31/2018] [Accepted: 09/03/2018] [Indexed: 02/06/2023]
Abstract
Glutamate is the neurotransmitter used at most excitatory synapses in the mammalian brain, including those in the olfactory bulb (OB). There, ionotropic glutamate receptors including N-methyl-d-aspartate receptors (NMDARs) and α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors (AMPARs) play a role in processes such as reciprocal inhibition and glomerular synchronization. Kainate receptors (KARs) represent another type of ionotropic glutamate receptor, which are composed of five (GluK1-GluK5) subunits. Whereas KARs appear to be heterogeneously expressed in the OB, evidence as to whether these KARs are functional, found at synapses, or modify synaptic transmission is limited. In the present study, coapplication of KAR agonists (kainate, SYM 2081) and AMPAR antagonists (GYKI 52466, SYM 2206) demonstrated that functional KARs are expressed by OB neurons, with a subset of receptors located at synapses. Application of kainate and the GluK1-selective agonist ATPA had modulatory effects on excitatory postsynaptic currents (EPSCs) evoked by stimulation of the olfactory nerve layer. Application of kainate and ATPA also had modulatory effects on reciprocal inhibitory postsynaptic currents (IPSCs) evoked using a protocol that evokes dendrodendritic inhibition. The latter finding suggests that KARs, with relatively slow kinetics, may play a role in circuits in which the relatively brief duration of AMPAR-mediated currents limits the role of AMPARs in synaptic transmission (e.g., reciprocal inhibition at dendrodendritic synapses). Collectively, our findings suggest that KARs, including those containing the GluK1 subunit, modulate excitatory and inhibitory transmission in the OB. These data further suggest that KARs participate in the regulation of synaptic circuits that encode odor information.
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Affiliation(s)
- Laura J Blakemore
- Program in Neuroscience, Florida State University, Tallahassee, FL, United States; Department of Biological Science, Florida State University, Tallahassee, FL, United States
| | - John T Corthell
- Program in Neuroscience, Florida State University, Tallahassee, FL, United States; Department of Biological Science, Florida State University, Tallahassee, FL, United States
| | - Paul Q Trombley
- Program in Neuroscience, Florida State University, Tallahassee, FL, United States; Department of Biological Science, Florida State University, Tallahassee, FL, United States.
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24
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Twomey EC, Yelshanskaya MV, Vassilevski AA, Sobolevsky AI. Mechanisms of Channel Block in Calcium-Permeable AMPA Receptors. Neuron 2018; 99:956-968.e4. [PMID: 30122377 PMCID: PMC6181147 DOI: 10.1016/j.neuron.2018.07.027] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 06/20/2018] [Accepted: 07/17/2018] [Indexed: 01/14/2023]
Abstract
AMPA receptors mediate fast excitatory neurotransmission and are critical for CNS development and function. Calcium-permeable subsets of AMPA receptors are strongly implicated in acute and chronic neurological disorders. However, despite the clinical importance, the therapeutic landscape for specifically targeting them, and not the calcium-impermeable AMPA receptors, remains largely undeveloped. To address this problem, we used cryo-electron microscopy and electrophysiology to investigate the mechanisms by which small-molecule blockers selectively inhibit ion channel conductance in calcium-permeable AMPA receptors. We determined the structures of calcium-permeable GluA2 AMPA receptor complexes with the auxiliary subunit stargazin bound to channel blockers, including the orb weaver spider toxin AgTx-636, the spider toxin analog NASPM, and the adamantane derivative IEM-1460. Our structures provide insights into the architecture of the blocker binding site and the mechanism of trapping, which are critical for development of small molecules that specifically target calcium-permeable AMPA receptors.
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Affiliation(s)
- Edward C Twomey
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA; Integrated Program in Cellular, Molecular and Biomedical Studies, Columbia University, New York, NY 10032, USA
| | - Maria V Yelshanskaya
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA
| | - Alexander A Vassilevski
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russia; Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow Oblast 141700, Russia
| | - Alexander I Sobolevsky
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA.
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25
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Chen Z, Mori W, Zhang X, Yamasaki T, Dunn PJ, Zhang G, Fu H, Shao T, Zhang Y, Hatori A, Ma L, Fujinaga M, Xie L, Deng X, Li H, Yu Q, Rong J, Josephson L, Ma JA, Shao Y, Tomita S, Zhang MR, Liang SH. Synthesis, pharmacology and preclinical evaluation of 11C-labeled 1,3-dihydro-2H-benzo[d]imidazole-2-ones for imaging γ8-dependent transmembrane AMPA receptor regulatory protein. Eur J Med Chem 2018; 157:898-908. [PMID: 30145376 DOI: 10.1016/j.ejmech.2018.08.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Revised: 08/04/2018] [Accepted: 08/06/2018] [Indexed: 11/20/2022]
Abstract
a-Amino-3-hydroxyl-5-methyl-4-isoxazolepropionic acid (AMPA) receptors are implicated in the pathology of neurological diseases such as epilepsy and schizophrenia. As pan antagonists for this target are often accompanied with undesired effects at high doses, one of the recent drug discovery approaches has shifted to subtype-selective AMPA receptor (AMPAR) antagonists, specifically, via modulating transmembrane AMPAR regulatory proteins (TARPs). The quantification of AMPARs by positron emission tomography (PET) would help obtain insights into disease conditions in the living brain and advance the translational development of AMPAR antagonists. Herein we report the design, synthesis and preclinical evaluation of a series of TARP γ-8 antagonists, amenable for radiolabeling, for the development of subtype-selective AMPAR PET imaging agents. Based on the pharmacology evaluation, molecular docking studies and physiochemical properties, we have identified several promising lead compounds 3, 17-19 and 21 for in vivo PET studies. All candidate compounds were labeled with [11C]COCl2 in high radiochemical yields (13-31% RCY) and high molar activities (35-196 GBq/μmol). While tracers 30 ([11C]17) &32 ([11C]21) crossed the blood-brain barrier and showed heterogeneous distribution in PET studies, consistent with TARP γ-8 expression, high nonspecific binding prevented further evaluation. To our delight, tracer 31 ([11C]3) showed good in vitro specific binding and characteristic high uptake in the hippocampus in rat brain tissues, which provides the guideline for further development of a new generation subtype selective TARP γ-8 dependent AMPAR tracers.
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Affiliation(s)
- Zhen Chen
- Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital & Department of Radiology, Harvard Medical School, Boston, MA, 02114, USA; Department of Chemistry, School of Science, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Wakana Mori
- Department of Radiopharmaceutics Development, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, 263-8555, Japan
| | - Xiaofei Zhang
- Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital & Department of Radiology, Harvard Medical School, Boston, MA, 02114, USA
| | - Tomoteru Yamasaki
- Department of Radiopharmaceutics Development, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, 263-8555, Japan
| | - Patrick J Dunn
- Department of Cellular and Molecular Physiology, Department of Neuroscience, Yale University School of Medicine, New Haven, CT, USA
| | - Genwei Zhang
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, 73019, USA
| | - Hualong Fu
- Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital & Department of Radiology, Harvard Medical School, Boston, MA, 02114, USA
| | - Tuo Shao
- Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital & Department of Radiology, Harvard Medical School, Boston, MA, 02114, USA
| | - Yiding Zhang
- Department of Radiopharmaceutics Development, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, 263-8555, Japan
| | - Akiko Hatori
- Department of Radiopharmaceutics Development, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, 263-8555, Japan
| | - Longle Ma
- Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital & Department of Radiology, Harvard Medical School, Boston, MA, 02114, USA
| | - Masayuki Fujinaga
- Department of Radiopharmaceutics Development, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, 263-8555, Japan
| | - Lin Xie
- Department of Radiopharmaceutics Development, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, 263-8555, Japan
| | - Xiaoyun Deng
- Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital & Department of Radiology, Harvard Medical School, Boston, MA, 02114, USA
| | - Hua Li
- Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital & Department of Radiology, Harvard Medical School, Boston, MA, 02114, USA
| | - Qingzhen Yu
- Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital & Department of Radiology, Harvard Medical School, Boston, MA, 02114, USA
| | - Jian Rong
- Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital & Department of Radiology, Harvard Medical School, Boston, MA, 02114, USA
| | - Lee Josephson
- Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital & Department of Radiology, Harvard Medical School, Boston, MA, 02114, USA
| | - Jun-An Ma
- Department of Chemistry, School of Science, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Yihan Shao
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, 73019, USA
| | - Susumu Tomita
- Department of Cellular and Molecular Physiology, Department of Neuroscience, Yale University School of Medicine, New Haven, CT, USA
| | - Ming-Rong Zhang
- Department of Radiopharmaceutics Development, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, 263-8555, Japan.
| | - Steven H Liang
- Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital & Department of Radiology, Harvard Medical School, Boston, MA, 02114, USA.
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26
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Muthukumaraswamy SD, Liley DT. 1/f electrophysiological spectra in resting and drug-induced states can be explained by the dynamics of multiple oscillatory relaxation processes. Neuroimage 2018; 179:582-595. [PMID: 29959047 DOI: 10.1016/j.neuroimage.2018.06.068] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [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: 11/08/2017] [Revised: 06/20/2018] [Accepted: 06/25/2018] [Indexed: 02/01/2023] Open
Abstract
Neurophysiological recordings are dominated by arhythmical activity whose spectra can be characterised by power-law functions, and on this basis are often referred to as reflecting scale-free brain dynamics (1/fβ). Relatively little is known regarding the neural generators and temporal dynamics of this arhythmical behaviour compared to rhythmical behaviour. Here we used Irregularly Resampled AutoSpectral Analysis (IRASA) to quantify β, in both the high (5-100 Hz, βhf) and low frequency bands (0.1-2.5 Hz, βlf) in MEG/EEG/ECoG recordings and to separate arhythmical from rhythmical modes of activity, such as, alpha rhythms. In MEG/EEG/ECoG data, we demonstrate that oscillatory alpha power dynamically correlates over time with βhf and similarly, participants with higher rhythmical alpha power have higher βhf. In a series of pharmaco-MEG investigations using the GABA reuptake inhibitor tiagabine, the glutamatergic AMPA receptor antagonist perampanel, the NMDA receptor antagonist ketamine and the mixed partial serotonergic agonist LSD, a variety of effects on both βhf and βlf were observed. Additionally, strong modulations of βhf were seen in monkey ECoG data during general anaesthesia using propofol and ketamine. We develop and test a unifying model which can explain, the 1/f nature of electrophysiological spectra, their dynamic interaction with oscillatory rhythms as well as the sensitivity of 1/f activity to drug interventions by considering electrophysiological spectra as being generated by a collection of stochastically perturbed damped oscillators having a distribution of relaxation rates.
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Affiliation(s)
- Suresh D Muthukumaraswamy
- School of Pharmacy and Centre for Brain Research, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand.
| | - David Tj Liley
- Centre for Human Psychopharmacology, School of Health Sciences, Swinburne University of Technology, Melbourne, Australia
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27
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Ruda-Kucerova J, Babinska Z, Luptak M, Getachew B, Tizabi Y. Both ketamine and NBQX attenuate alcohol drinking in male Wistar rats. Neurosci Lett 2018; 666:175-180. [PMID: 29288725 PMCID: PMC5805612 DOI: 10.1016/j.neulet.2017.12.055] [Citation(s) in RCA: 18] [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] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 12/22/2017] [Accepted: 12/23/2017] [Indexed: 11/18/2022]
Abstract
The devastating consequences of alcohol-use disorder (AUD) on the individual and the society are well established. Current treatments of AUD encompass various strategies, all of which have only modest effectiveness. Hence, there is a critical need to develop more efficacious therapies. Recently, specific glutamatergic receptors have been identified as potential novel targets for intervention in AUD. Thus, the current study was designed to evaluate the effects of acute administration of sub-anesthetic doses of ketamine, an NMDA receptor antagonist, as well as NBQX, an AMPA/kainate receptor antagonist on alcohol intake and its possible behavioural consequences. Adult male Wistar rats were trained in drinking in dark paradigm (3 weeks), and following stable alcohol intake, ketamine, NBQX as well as their combination were injected prior to a 90 min drinking session. In addition to alcohol intake, sucrose preference (overnight), and locomotor activity and forced swim test (FST) were also evaluated before and following alcohol intake. Both doses of ketamine (5 and 10 mg/kg) and NBQX (5 and 10 mg/kg) significantly attenuated percent alcohol intake. The combination of the higher dose of ketamine and NBQX, however, did not significantly affect percent alcohol intake. Moreover, animals exposed to alcohol showed decreased sucrose intake (reflective of anhedonia), decreased locomotor activity and swimming in the FST (reflective of helplessness), that were not affected by ketamine and/or NBQX. These results suggest that selective antagonism of the NMDA or AMPA/kainate receptors may be of therapeutic potential in AUD.
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Affiliation(s)
- Jana Ruda-Kucerova
- Department of Pharmacology, Faculty of Medicine, Masaryk University, Brno, Czech Republic.
| | - Zuzana Babinska
- Department of Pharmacology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Matej Luptak
- Department of Pharmacology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Bruk Getachew
- Department of Pharmacology, Howard University College of Medicine, Washington, DC, USA
| | - Yousef Tizabi
- Department of Pharmacology, Howard University College of Medicine, Washington, DC, USA
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28
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Umino M, Umino A, Nishikawa T. Effects of selective calcium-permeable AMPA receptor blockade by IEM 1460 on psychotomimetic-induced hyperactivity in the mouse. J Neural Transm (Vienna) 2017; 125:705-711. [PMID: 29270730 DOI: 10.1007/s00702-017-1827-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [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: 08/09/2017] [Accepted: 12/12/2017] [Indexed: 12/27/2022]
Abstract
Diminished glutamate neurotransmission via the N-methyl-D-aspartate type glutamate receptor (NMDAR) has been considered to be involved in the pathophysiology of schizophrenia based upon the observation that the antagonists and autoantibodies of NMDAR cause positive, negative and cognitive symptomatologies similar to those of schizophrenia. The possible reduced extracellular levels of D-serine by overstimulation of the calcium-permeable α-amino-3-hydroxyl-5-methyl-4-isoxazole-propionate glutamate receptor (CP-AMPAR) following the NMDAR hypofunction-induced compensatory increase in the glutamate release could aggravate the NMDAR hypofunction in the brain of the drug- or antibody-associated psychoses and schizophrenia, because D-serine is an intrinsic coagonist for the NMDAR. To obtain an insight into the therapeutic approach to such a glutamate-linked psychotic state, we have studied the effects of the systemic administration of the CP-AMPAR-selective antagonist, IEM 1460 (N,N,N-trimethyl-5- [(tricyclo[3.3.1.13,7]dec-1-ylmethyl)amino]-1-pentanaminium bromide hydrobromide), on the hyperactivity following an injection of a schizophrenomimetic NMDAR antagonist, phencyclidine, in the mouse. The subcutaneous IEM 1460 application produced a dose-dependent inhibition of the increased movement counts after the subcutaneous injection of phencyclidine. This inhibiting influence was also seen on the hyperactivity elicited by another NMDAR antagonist, dizocilpine. Moreover, the IEM 1460 administration attenuated the ability of a schizophrenomimetic dopamine agonist, methamphetamine, to increase spontaneous movements. These findings indicate that dysregulation of the CP-AMPAR could, at least in part, be implicated in the glutamate pathology of schizophrenia and/or related psychotic symptoms and be a potential target for the development of their novel treatment.
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Affiliation(s)
- Masakazu Umino
- Department of Psychiatry and Behavioral Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan
- Center for Brain Integration Research, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan
| | - Asami Umino
- Department of Psychiatry and Behavioral Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan
- Center for Brain Integration Research, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan
| | - Toru Nishikawa
- Department of Psychiatry and Behavioral Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan.
- Center for Brain Integration Research, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan.
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29
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Han KS, Cooke SF, Xu W. Experience-Dependent Equilibration of AMPAR-Mediated Synaptic Transmission during the Critical Period. Cell Rep 2017; 18:892-904. [PMID: 28122240 DOI: 10.1016/j.celrep.2016.12.084] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [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: 07/01/2016] [Revised: 11/21/2016] [Accepted: 12/26/2016] [Indexed: 11/17/2022] Open
Abstract
Experience-dependent synapse refinement is essential for functional optimization of neural circuits. However, how sensory experience sculpts excitatory synaptic transmission is poorly understood. Here, we show that despite substantial remodeling of synaptic connectivity, AMPAR-mediated synaptic transmission remains at equilibrium during the critical period in the mouse primary visual cortex. The maintenance of this equilibrium requires neurogranin (Ng), a postsynaptic calmodulin-binding protein important for synaptic plasticity. With normal visual experience, loss of Ng decreased AMPAR-positive synapse numbers, prevented AMPAR-silent synapse maturation, and increased spine elimination. Importantly, visual deprivation halted synapse loss caused by loss of Ng, revealing that Ng coordinates experience-dependent AMPAR-silent synapse conversion to AMPAR-active synapses and synapse elimination. Loss of Ng also led to sensitized long-term synaptic depression (LTD) and impaired visually guided behavior. Our synaptic interrogation reveals that experience-dependent coordination of AMPAR-silent synapse conversion and synapse elimination hinges upon Ng-dependent mechanisms for constructive synaptic refinement during the critical period.
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Affiliation(s)
- Kyung-Seok Han
- Picower Institute for Learning and Memory, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Samuel F Cooke
- Picower Institute for Learning and Memory, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Weifeng Xu
- Picower Institute for Learning and Memory, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
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30
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Winland CD, Welsh N, Sepulveda-Rodriguez A, Vicini S, Maguire-Zeiss KA. Inflammation alters AMPA-stimulated calcium responses in dorsal striatal D2 but not D1 spiny projection neurons. Eur J Neurosci 2017; 46:2519-2533. [PMID: 28921719 PMCID: PMC5673553 DOI: 10.1111/ejn.13711] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [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: 04/13/2017] [Revised: 08/23/2017] [Accepted: 08/24/2017] [Indexed: 12/22/2022]
Abstract
Neuroinflammation precedes neuronal loss in striatal neurodegenerative diseases and can be exacerbated by the release of proinflammatory molecules by microglia. These molecules can affect trafficking of AMPARs. The preferential trafficking of calcium-permeable versus impermeable AMPARs can result in disruptions of [Ca2+ ]i and alter cellular functions. In striatal neurodegenerative diseases, changes in [Ca2+ ]i and L-type voltage-gated calcium channels (VGCCs) have been reported. Therefore, this study sought to determine whether a proinflammatory environment alters AMPA-stimulated [Ca2+ ]i through calcium-permeable AMPARs and/or L-type VGCCs in dopamine-2- and dopamine-1-expressing striatal spiny projection neurons (D2 and D1 SPNs) in the dorsal striatum. Mice expressing the calcium indicator protein, GCaMP in D2 or D1 SPNs, were utilized for calcium imaging. Microglial activation was assessed by morphology analyses. To induce inflammation, acute mouse striatal slices were incubated with lipopolysaccharide (LPS). Here we report that LPS treatment potentiated AMPA responses only in D2 SPNs. When a nonspecific VGCC blocker was included, we observed a decrease of AMPA-stimulated calcium fluorescence in D2 but not D1 SPNs. The remaining agonist-induced [Ca2+ ]i was mediated by calcium-permeable AMPARs because the responses were completely blocked by a selective calcium-permeable AMPAR antagonist. We used isradipine, the highly selective L-type VGCC antagonist to determine the role of L-type VGCCs in SPNs treated with LPS. Isradipine decreased AMPA-stimulated responses selectively in D2 SPNs after LPS treatment. Our findings suggest that dorsal striatal D2 SPNs are specifically targeted in proinflammatory conditions and that L-type VGCCs and calcium-permeable AMPARs are important mediators of this effect.
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MESH Headings
- Animals
- CX3C Chemokine Receptor 1/genetics
- CX3C Chemokine Receptor 1/metabolism
- Calcium/metabolism
- Calcium Channel Blockers/pharmacology
- Calcium Channels, L-Type/metabolism
- Cations, Divalent/metabolism
- Corpus Striatum/drug effects
- Corpus Striatum/metabolism
- Corpus Striatum/pathology
- Dopaminergic Neurons/drug effects
- Dopaminergic Neurons/metabolism
- Dopaminergic Neurons/pathology
- Female
- Inflammation/metabolism
- Inflammation/pathology
- Lipopolysaccharides
- Male
- Mice, Inbred C57BL
- Mice, Transgenic
- Microglia/drug effects
- Microglia/metabolism
- Microglia/pathology
- Receptors, AMPA/antagonists & inhibitors
- Receptors, AMPA/metabolism
- Receptors, Dopamine D1/genetics
- Receptors, Dopamine D1/metabolism
- Receptors, Dopamine D2/genetics
- Receptors, Dopamine D2/metabolism
- Tissue Culture Techniques
- alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid/metabolism
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Affiliation(s)
- Carissa D. Winland
- Interdisciplinary Program in Neuroscience, Georgetown University Medical Center, Washington, D.C. 20007 USA
- Department of Neuroscience, Georgetown University Medical Center, Washington, D.C. 20007 USA
| | - Nora Welsh
- Department of Biology, Georgetown University, Washington, D.C. 20007 USA
| | - Alberto Sepulveda-Rodriguez
- Interdisciplinary Program in Neuroscience, Georgetown University Medical Center, Washington, D.C. 20007 USA
- Department of Pharmacology & Physiology, Georgetown University Medical Center, Washington, D.C. 20007 USA
| | - Stefano Vicini
- Interdisciplinary Program in Neuroscience, Georgetown University Medical Center, Washington, D.C. 20007 USA
- Department of Pharmacology & Physiology, Georgetown University Medical Center, Washington, D.C. 20007 USA
| | - Kathleen A. Maguire-Zeiss
- Interdisciplinary Program in Neuroscience, Georgetown University Medical Center, Washington, D.C. 20007 USA
- Department of Neuroscience, Georgetown University Medical Center, Washington, D.C. 20007 USA
- Department of Biology, Georgetown University, Washington, D.C. 20007 USA
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31
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Schidlitzki A, Twele F, Klee R, Waltl I, Römermann K, Bröer S, Meller S, Gerhauser I, Rankovic V, Li D, Brandt C, Bankstahl M, Töllner K, Löscher W. A combination of NMDA and AMPA receptor antagonists retards granule cell dispersion and epileptogenesis in a model of acquired epilepsy. Sci Rep 2017; 7:12191. [PMID: 28939854 PMCID: PMC5610327 DOI: 10.1038/s41598-017-12368-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 09/08/2017] [Indexed: 01/01/2023] Open
Abstract
Epilepsy may arise following acute brain insults, but no treatments exist that prevent epilepsy in patients at risk. Here we examined whether a combination of two glutamate receptor antagonists, NBQX and ifenprodil, acting at different receptor subtypes, exerts antiepileptogenic effects in the intrahippocampal kainate mouse model of epilepsy. These drugs were administered over 5 days following kainate. Spontaneous seizures were recorded by video/EEG at different intervals up to 3 months. Initial trials showed that drug treatment during the latent period led to higher mortality than treatment after onset of epilepsy, and further, that combined therapy with both drugs caused higher mortality at doses that appear safe when used singly. We therefore refined the combined-drug protocol, using lower doses. Two weeks after kainate, significantly less mice of the NBQX/ifenprodil group exhibited electroclinical seizures compared to vehicle controls, but this effect was lost at subsequent weeks. The disease modifying effect of the treatment was associated with a transient prevention of granule cell dispersion and less neuronal degeneration in the dentate hilus. These data substantiate the involvement of altered glutamatergic transmission in the early phase of epileptogenesis. Longer treatment with NBQX and ifenprodil may shed further light on the apparent temporal relationship between dentate gyrus reorganization and development of spontaneous seizures.
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Affiliation(s)
- Alina Schidlitzki
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559, Hannover, Germany
- Center for Systems Neuroscience, 30559, Hannover, Germany
| | - Friederike Twele
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559, Hannover, Germany
| | - Rebecca Klee
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559, Hannover, Germany
| | - Inken Waltl
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559, Hannover, Germany
- Center for Systems Neuroscience, 30559, Hannover, Germany
| | - Kerstin Römermann
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559, Hannover, Germany
| | - Sonja Bröer
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559, Hannover, Germany
| | - Sebastian Meller
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559, Hannover, Germany
- Center for Systems Neuroscience, 30559, Hannover, Germany
| | - Ingo Gerhauser
- Department of Pathology, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Vladan Rankovic
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559, Hannover, Germany
- Institute for Auditory Neuroscience at University Medical Center Göttingen & German Primate Center, Göttingen, Germany
| | - Dandan Li
- Center for Systems Neuroscience, 30559, Hannover, Germany
- Department of Pathology, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Claudia Brandt
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559, Hannover, Germany
| | - Marion Bankstahl
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559, Hannover, Germany
- Center for Systems Neuroscience, 30559, Hannover, Germany
| | - Kathrin Töllner
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559, Hannover, Germany
| | - Wolfgang Löscher
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559, Hannover, Germany.
- Center for Systems Neuroscience, 30559, Hannover, Germany.
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32
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Borroni B, Stanic J, Verpelli C, Mellone M, Bonomi E, Alberici A, Bernasconi P, Culotta L, Zianni E, Archetti S, Manes M, Gazzina S, Ghidoni R, Benussi L, Stuani C, Di Luca M, Sala C, Buratti E, Padovani A, Gardoni F. Anti-AMPA GluA3 antibodies in Frontotemporal dementia: a new molecular target. Sci Rep 2017; 7:6723. [PMID: 28751743 PMCID: PMC5532270 DOI: 10.1038/s41598-017-06117-y] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Accepted: 06/07/2017] [Indexed: 12/12/2022] Open
Abstract
Frontotemporal Dementia (FTD) is a neurodegenerative disorder mainly characterised by Tau or TDP43 inclusions. A co-autoimmune aetiology has been hypothesised. In this study, we aimed at defining the pathogenetic role of anti-AMPA GluA3 antibodies in FTD. Serum and cerebrospinal fluid (CSF) anti-GluA3 antibody dosage was carried out and the effect of CSF with and without anti-GluA3 antibodies was tested in rat hippocampal neuronal primary cultures and in differentiated neurons from human induced pluripotent stem cells (hiPSCs). TDP43 and Tau expression in hiPSCs exposed to CSF was assayed. Forty-one out of 175 screened FTD sera were positive for the presence of anti-GluA3 antibodies (23.4%). FTD patients with anti-GluA3 antibodies more often presented presenile onset, behavioural variant FTD with bitemporal atrophy. Incubation of rat hippocampal neuronal primary cultures with CSF with anti-GluA3 antibodies led to a decrease of GluA3 subunit synaptic localization of the AMPA receptor (AMPAR) and loss of dendritic spines. These results were confirmed in differentiated neurons from hiPSCs, with a significant reduction of the GluA3 subunit in the postsynaptic fraction along with increased levels of neuronal Tau. In conclusion, autoimmune mechanism might represent a new potentially treatable target in FTD and might open new lights in the disease underpinnings.
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Affiliation(s)
- B Borroni
- Neurology Unit, Centre for Neurodegenerative Disorders, Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy.
| | - J Stanic
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Milan, Italy
| | - C Verpelli
- CNR Institute of Neuroscience and Department of Biotechnology and Translational Medicine, University of Milan, Milan, Italy
| | - M Mellone
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Milan, Italy
| | - E Bonomi
- Neurology Unit, Centre for Neurodegenerative Disorders, Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | - A Alberici
- Neurology Unit, Centre for Neurodegenerative Disorders, Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | | | - L Culotta
- CNR Institute of Neuroscience and Department of Biotechnology and Translational Medicine, University of Milan, Milan, Italy
| | - E Zianni
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Milan, Italy
| | - S Archetti
- III Laboratory of Analyses, Biotechnology Laboratory, Brescia Hospital, Brescia, Italy
| | - M Manes
- Neurology Unit, Centre for Neurodegenerative Disorders, Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | - S Gazzina
- Neurology Unit, Centre for Neurodegenerative Disorders, Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | - R Ghidoni
- Molecular Markers Laboratory, IRCCS Fatebenefratelli S. Giovanni di Dio, Brescia, Italy
| | - L Benussi
- Molecular Markers Laboratory, IRCCS Fatebenefratelli S. Giovanni di Dio, Brescia, Italy
| | - C Stuani
- International Centre for Genetic Engineering and Biotechnology-ICGEB, Trieste, Italy
| | - M Di Luca
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Milan, Italy
| | - C Sala
- CNR Institute of Neuroscience and Department of Biotechnology and Translational Medicine, University of Milan, Milan, Italy
| | - E Buratti
- International Centre for Genetic Engineering and Biotechnology-ICGEB, Trieste, Italy
| | - A Padovani
- Neurology Unit, Centre for Neurodegenerative Disorders, Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | - F Gardoni
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Milan, Italy.
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33
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Joshi S, Rajasekaran K, Sun H, Williamson J, Kapur J. Enhanced AMPA receptor-mediated neurotransmission on CA1 pyramidal neurons during status epilepticus. Neurobiol Dis 2017; 103:45-53. [PMID: 28377128 PMCID: PMC5481781 DOI: 10.1016/j.nbd.2017.03.017] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [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: 10/07/2016] [Revised: 03/29/2017] [Accepted: 03/31/2017] [Indexed: 12/20/2022] Open
Abstract
Status epilepticus (SE) is a common neurological emergency that results from the failure of the mechanisms responsible for seizure termination or the initiation of mechanisms that lead to abnormally prolonged seizures. Although the failure of inhibitory mechanisms during SE is well understood, the seizure-initiating mechanisms are poorly understood. We tested whether hippocampal α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR)-mediated transmission was enhanced during SE and assessed the underlying molecular mechanism. In animals in self-sustaining limbic SE the amplitudes of the miniature, spontaneous, and AMPA-evoked excitatory currents recorded from the CA1 pyramidal neurons were larger than those recorded in the controls. The evoked EPSCs rectified inwardly. In these animals, the surface expression of GluA1 subunit-containing AMPARs was increased in the CA1 pyramidal neurons. The phosphorylation of the GluA1 subunit on S831 and S845 residues was reduced in animals in SE. In contrast, the GluA1 subunit surface expression and AMPAR-mediated neurotransmission of dentate granule cells (DGCs) was not altered. Treating animals in SE with the NMDAR antagonist MK-801 or with diazaepam blocked the increased surface expression of the GluA1 subunits. NMDAR blockade also prevented the dephosphorylation of the S845 residue but not that of S831. Targeting NMDARs and AMPARs may provide novel strategies to treat benzodiazepine-refractory SE.
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Affiliation(s)
- Suchitra Joshi
- Department of Neurology, University of Virginia, Charlottesville, VA 22908, United States
| | - Karthik Rajasekaran
- Department of Neurology, University of Virginia, Charlottesville, VA 22908, United States
| | - Huayu Sun
- Department of Neurology, University of Virginia, Charlottesville, VA 22908, United States
| | - John Williamson
- Department of Neurology, University of Virginia, Charlottesville, VA 22908, United States
| | - Jaideep Kapur
- Department of Neurology, University of Virginia, Charlottesville, VA 22908, United States; Department of Neuroscience University of Virginia, Charlottesville, VA 22908, United States.
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34
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Jaremko WJ, Huang Z, Wen W, Wu A, Karl N, Niu L. Identification and characterization of RNA aptamers: A long aptamer blocks the AMPA receptor and a short aptamer blocks both AMPA and kainate receptors. J Biol Chem 2017; 292:7338-7347. [PMID: 28325839 PMCID: PMC5418036 DOI: 10.1074/jbc.m116.774752] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 12/30/2016] [Revised: 03/17/2017] [Indexed: 11/06/2022] Open
Abstract
AMPA and kainate receptors, along with NMDA receptors, represent different subtypes of glutamate ion channels. AMPA and kainate receptors share a high degree of sequence and structural similarities, and excessive activity of these receptors has been implicated in neurological diseases such as epilepsy. Therefore, blocking detrimental activity of both receptor types could be therapeutically beneficial. Here, we report the use of an in vitro evolution approach involving systematic evolution of ligands by exponential enrichment with a single AMPA receptor target (i.e. GluA1/2R) to isolate RNA aptamers that can potentially inhibit both AMPA and kainate receptors. A full-length or 101-nucleotide (nt) aptamer selectively inhibited GluA1/2R with a KI of ∼5 μm, along with GluA1 and GluA2 AMPA receptor subunits. Of note, its shorter version (55 nt) inhibited both AMPA and kainate receptors. In particular, this shorter aptamer blocked equally potently the activity of both the GluK1 and GluK2 kainate receptors. Using homologous binding and whole-cell recording assays, we found that an RNA aptamer most likely binds to the receptor's regulatory site and inhibits it noncompetitively. Our results suggest the potential of using a single receptor target to develop RNA aptamers with dual activity for effectively blocking both AMPA and kainate receptors.
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Affiliation(s)
- William J Jaremko
- From the Department of Chemistry and Center for Neuroscience Research, University at Albany, SUNY, Albany, New York 12222
| | - Zhen Huang
- From the Department of Chemistry and Center for Neuroscience Research, University at Albany, SUNY, Albany, New York 12222
| | - Wei Wen
- From the Department of Chemistry and Center for Neuroscience Research, University at Albany, SUNY, Albany, New York 12222
| | - Andrew Wu
- From the Department of Chemistry and Center for Neuroscience Research, University at Albany, SUNY, Albany, New York 12222
| | - Nicholas Karl
- From the Department of Chemistry and Center for Neuroscience Research, University at Albany, SUNY, Albany, New York 12222
| | - Li Niu
- From the Department of Chemistry and Center for Neuroscience Research, University at Albany, SUNY, Albany, New York 12222
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35
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Gmiro VE, Serdyuk SE, Veselkina OS. [COMPARISON OF CHRONIC ANTICONVULSANT ACTIVITY AND SAFETY OF IEM-2062, SODIUM VALPROATE AND ME-MANTINE IN THE PENTYLENETETRAZOL KINDLING MODEL IN RATS]. Ross Fiziol Zh Im I M Sechenova 2017; 103:299-306. [PMID: 30199210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
IEM-2062 [1-(6-aminohexylamino)-1-phenylcyclohexyl dihydrochloride], causing a combined block NMDA and AMPA receptors, after chronic oral administration in doses, respectively, 0.3 and 3 mg/kg, induce maximal anticonvulsant effect in the pentylenetetrazol kindling rats because decrease the number of completely kindling rats by 100 %, and also decrease in 2.5-3.3 times the average severity of clonic-tonic kindling seizures. IEM-2062 causes significant anticon- 299 vulsant effects in the widest range of doses, 1-48 mg/kg, which is 24-22 times more than that of memantine (12-20 mg/kg) and sodium valproate (100-200 mg/kg). Sodium valproate and memantine cause significant disturbances of locomotor activity in the «open field» test in doses causing maximal anticonvulsant effect in the kindling rats. At the same time IEM-2062 cause disturbance of locomotor activity only in very high dose of 92 mg/kg, which exceeds in 30.7 times the dose causing the maximum anticonvulsive effect in the kindling rats. Thus, IEM-2062 reduces the severity of kindling seizures in 1.7-1.9 times stronger than sodium valproate and memantine and also by 30.7 times is safer than sodium valproate and memantine.
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Barygin OI, Nagaeva EI, Tikhonov DB, Belinskaya DA, Vanchakova NP, Shestakova NN. Inhibition of the NMDA and AMPA receptor channels by antidepressants and antipsychotics. Brain Res 2017; 1660:58-66. [PMID: 28167075 DOI: 10.1016/j.brainres.2017.01.028] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [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: 07/14/2016] [Revised: 01/18/2017] [Accepted: 01/19/2017] [Indexed: 12/22/2022]
Abstract
It is known that some antidepressants and antipsychotics directly inhibit NMDA-type ionotropic glutamate receptors. In this study we systematically studied action of seven drugs (Fluoxetine, Citalopram, Desipramine, Amitriptyline, Atomoxetine, Chlorpromazine, and Clozapine) on NMDA receptors and Ca2+-permeable and -impermeable AMPA receptors in rat brain neurons by whole-cell patch-clamp technique. Except for weak effect of fluoxetine, all drugs were virtually inactive against Ca2+-impermeable AMPA receptors. Fluoxetine and desipramine significantly inhibited Ca2+-permeable AMPA receptors (IC50=43±7 and 105±12µM, respectively). Desipramine, atomoxetine and chlorpromazine inhibited NMDA receptors in clinically relevant low micromolar concentrations, while citalopram had only weak effect. All tested medicines have been clustered into two groups by their action on NMDA receptors: desipramine, amitriptyline, chlorpromazine, and atomoxetine display voltage- and magnesium-dependent open channel blocking mechanism. Action of fluoxetine and clozapine was found to be voltage- and magnesium-independent. All voltage-dependent compounds could be trapped in closed NMDA receptor channels. Possible contribution of NMDA receptor inhibition by certain antidepressants and antipsychotics to their analgesic effects in neuropathic pain is discussed.
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Affiliation(s)
- Oleg I Barygin
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry RAS, Saint-Petersburg, Russia.
| | - Elina I Nagaeva
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry RAS, Saint-Petersburg, Russia
| | - Denis B Tikhonov
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry RAS, Saint-Petersburg, Russia
| | - Darya A Belinskaya
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry RAS, Saint-Petersburg, Russia
| | - Nina P Vanchakova
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry RAS, Saint-Petersburg, Russia
| | - Natalia N Shestakova
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry RAS, Saint-Petersburg, Russia
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Cai S, Ling C, Lu J, Duan S, Wang Y, Zhu H, Lin R, Chen L, Pan X, Cai M, Gu H. EGAR, A Food Protein-Derived Tetrapeptide, Reduces Seizure Activity in Pentylenetetrazole-Induced Epilepsy Models Through α-Amino-3-Hydroxy-5-Methyl-4-Isoxazole Propionate Receptors. Neurotherapeutics 2017; 14:212-226. [PMID: 27783277 PMCID: PMC5233631 DOI: 10.1007/s13311-016-0489-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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] [Indexed: 12/11/2022] Open
Abstract
A primary pathogeny of epilepsy is excessive activation of α-amino-3-hydroxy-5-methyl-4-isoxazole propionate receptors (AMPARs). To find potential molecules to inhibit AMPARs, high-throughput screening was performed in a library of tetrapeptides in silico. Computational results suggest that some tetrapeptides bind stably to the AMPAR. We aligned these sequences of tetrapeptide candidates with those from in vitro digestion of the trout skin protein. Among salmon-derived products, Glu-Gly-Ala-Arg (EGAR) showed a high biological affinity toward AMPAR when tested in silico. Accordingly, natural EGAR was hypothesized to have anticonvulsant activity, and in vitro experiments showed that EGAR selectively inhibited AMPAR-mediated synaptic transmission without affecting the electrophysiological properties of hippocampal pyramidal neurons. In addition, EGAR reduced neuronal spiking in an in vitro seizure model. Moreover, the ability of EGAR to reduce seizures was evaluated in a rodent epilepsy model. Briefer and less severe seizures versus controls were shown after mice were treated with EGAR. In conclusion, the promising experimental results suggest that EGAR inhibitor against AMPARs may be a target for antiepilepsy pharmaceuticals. Epilepsy is a common brain disorder characterized by the occurrence of recurring, unprovoked seizures. Twenty to 30 % of persons with epilepsy do not achieve adequate seizure control with any drug. Here we provide a possibility in which a natural and edible tetrapeptide, EGAR, can act as an antiepileptic agent. We have combined computation with in vitro experiments to show how EGAR modulates epilepsy. We also used an animal model of epilepsy to prove that EGAR can inhibit seizures in vivo. This study suggests EGAR as a potential pharmaceutical for the treatment of epilepsy.
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Affiliation(s)
- Song Cai
- Department of Anatomy, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, China
| | - Chuwen Ling
- Department of Anatomy, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, China
- School of Public Health, Sun Yat-Sen University, Guangzhou, Guangdong, 510080, China
| | - Jun Lu
- Research Center of Protein and Functional Peptides, China National Research Institute of Food and Fermentation Industries, Beijing, 100015, China
| | - Songwei Duan
- Department of Anatomy, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, China
- Guanghua School of Stomatology, Sun Yat-Sen University, Guangzhou, Guangdong, 510080, China
| | - Yingzhao Wang
- Department of Anatomy, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, China
| | - Huining Zhu
- Department of Anatomy, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, China
| | - Ruibang Lin
- Department of Anatomy, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, China
- Guanghua School of Stomatology, Sun Yat-Sen University, Guangzhou, Guangdong, 510080, China
| | - Liang Chen
- Research Center of Protein and Functional Peptides, China National Research Institute of Food and Fermentation Industries, Beijing, 100015, China
| | - Xingchang Pan
- Research Center of Protein and Functional Peptides, China National Research Institute of Food and Fermentation Industries, Beijing, 100015, China
| | - Muyi Cai
- Research Center of Protein and Functional Peptides, China National Research Institute of Food and Fermentation Industries, Beijing, 100015, China.
| | - Huaiyu Gu
- Department of Anatomy, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, China.
- Guangdong Province Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-sen University, 74 Zhongshan 2nd Road, Guangzhou, 510080, China.
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Snoeijen-Schouwenaars FM, van Ool JS, Tan IY, Schelhaas HJ, Majoie MHJM. Evaluation of perampanel in patients with intellectual disability and epilepsy. Epilepsy Behav 2017; 66:64-67. [PMID: 28038388 DOI: 10.1016/j.yebeh.2016.10.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [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: 07/29/2016] [Revised: 10/05/2016] [Accepted: 10/08/2016] [Indexed: 01/12/2023]
Abstract
INTRODUCTION Initial registration studies of perampanel (PMP), an AMPA receptor antagonist, have now been followed up by 'clinical' studies that confirmed its efficacy and safety in patients with refractory epilepsy. Publications on the use of PMP among patients with intellectual disability (ID) are still limited. This study extends our knowledge with respect to the relevance of PMP for patients with both ID and epilepsy, and furthermore specifies the behavioral side effects of PMP in this specific population. METHODS Retrospective evaluation of medical records at 3, 6 and 12months of follow-up after the initial start of PMP. RESULTS 62 patients were included. 21 patients (33.9%) were female. All patients had complete data of 6months follow-up and we were able to review 42 patients with a 1-year follow-up. Level of ID varied from borderline to profound, and mild ID was most common (43.5%). The mean maximum daily dosage of PMP was 5.6mg (range 1-12mg). Retention rates for PMP were 87.1% and 67.7% after three and six months. A trend indicated a longer mean retention time in patients with a more severe ID (borderline-mild-moderate ID: 205days, severe-profound ID: 275days). Seizure reduction was achieved in 53.2%. 36 patients (58.1%) experienced adverse effects, 80.6% of those within 3months. 45.2% of the patients experienced somatic adverse effects. Most common were fatigue & sleep problems, motor problems & unsteadiness, and gastrointestinal problems. Behavioral adverse effects were present in 40.3%. Most common were aggression, agitated behavior, disruptive behavior, and mood symptoms. Reasons for discontinuation of PMP were lack of efficacy in 14.8%, intolerable adverse effects in 44.4%, and a combination of both in 40.7%. Altogether, 24.2% (15/62) of the patients achieved seizure reduction without experiencing adverse effects, though none reached seizure freedom. CONCLUSIONS The use of PMP might lead to an effective seizure reduction without adverse effects in a minority of patients with both epilepsy and ID. Pre-existing behavioral problems or polypharmacy do not predict the occurrence of additional behavioral adverse effects, implying that these patients need not be excluded from the introduction of PMP when clinically indicated. Patients should, ideally, be monitored at a multidisciplinary clinic.
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Affiliation(s)
| | - Jans S van Ool
- Academic Centre for Epileptology Kempenhaeghe, Department of Residential Care, The Netherlands
| | - In Y Tan
- Academic Centre for Epileptology Kempenhaeghe, Department of Residential Care, The Netherlands
| | - Helenius J Schelhaas
- Academic Centre for Epileptology Kempenhaeghe, Department of Neurology, The Netherlands
| | - Marian H J M Majoie
- Academic Centre for Epileptology Kempenhaeghe, Department of Neurology, The Netherlands; School of Mental Health and Neuroscience, Maastricht University Medical Center, The Netherlands; School of Health Professions Education, Faculty of Health, Medicine and Life Sciences, Maastricht University, The Netherlands
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Li Y, Dharkar P, Han TH, Serpe M, Lee CH, Mayer ML. Novel Functional Properties of Drosophila CNS Glutamate Receptors. Neuron 2016; 92:1036-1048. [PMID: 27889096 DOI: 10.1016/j.neuron.2016.10.058] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [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: 08/08/2016] [Revised: 10/12/2016] [Accepted: 10/12/2016] [Indexed: 01/08/2023]
Abstract
Phylogenetic analysis reveals AMPA, kainate, and NMDA receptor families in insect genomes, suggesting conserved functional properties corresponding to their vertebrate counterparts. However, heterologous expression of the Drosophila kainate receptor DKaiR1D and the AMPA receptor DGluR1A revealed novel ligand selectivity at odds with the classification used for vertebrate glutamate receptor ion channels (iGluRs). DKaiR1D forms a rapidly activating and desensitizing receptor that is inhibited by both NMDA and the NMDA receptor antagonist AP5; crystallization of the KaiR1D ligand-binding domain reveals that these ligands stabilize open cleft conformations, explaining their action as antagonists. Surprisingly, the AMPA receptor DGluR1A shows weak activation by its namesake agonist AMPA and also by quisqualate. Crystallization of the DGluR1A ligand-binding domain reveals amino acid exchanges that interfere with binding of these ligands. The unexpected ligand-binding profiles of insect iGluRs allows classical tools to be used in novel approaches for the study of synaptic regulation. VIDEO ABSTRACT.
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Affiliation(s)
- Yan Li
- Program in Cellular Regulation and Metabolism, NICHD, NIH, Bethesda, MD 20892, USA
| | - Poorva Dharkar
- Laboratory of Cellular and Molecular Neurophysiology, Porter Neuroscience Research Center, NICHD, NIH, Bethesda, MD 20892, USA
| | - Tae-Hee Han
- Program in Cellular Regulation and Metabolism, NICHD, NIH, Bethesda, MD 20892, USA
| | - Mihaela Serpe
- Program in Cellular Regulation and Metabolism, NICHD, NIH, Bethesda, MD 20892, USA
| | - Chi-Hon Lee
- Program in Cellular Regulation and Metabolism, NICHD, NIH, Bethesda, MD 20892, USA.
| | - Mark L Mayer
- Laboratory of Cellular and Molecular Neurophysiology, Porter Neuroscience Research Center, NICHD, NIH, Bethesda, MD 20892, USA.
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Yelshanskaya MV, Singh AK, Sampson JM, Narangoda C, Kurnikova M, Sobolevsky AI. Structural Bases of Noncompetitive Inhibition of AMPA-Subtype Ionotropic Glutamate Receptors by Antiepileptic Drugs. Neuron 2016; 91:1305-1315. [PMID: 27618672 DOI: 10.1016/j.neuron.2016.08.012] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [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] [Received: 05/22/2016] [Revised: 07/02/2016] [Accepted: 08/02/2016] [Indexed: 11/19/2022]
Abstract
Excitatory neurotransmission plays a key role in epileptogenesis. Correspondingly, AMPA-subtype ionotropic glutamate receptors, which mediate the majority of excitatory neurotransmission and contribute to seizure generation and spread, have emerged as promising targets for epilepsy therapy. The most potent and well-tolerated AMPA receptor inhibitors act via a noncompetitive mechanism, but many of them produce adverse side effects. The design of better drugs is hampered by the lack of a structural understanding of noncompetitive inhibition. Here, we report crystal structures of the rat AMPA-subtype GluA2 receptor in complex with three noncompetitive inhibitors. The inhibitors bind to a novel binding site, completely conserved between rat and human, at the interface between the ion channel and linkers connecting it to the ligand-binding domains. We propose that the inhibitors stabilize the AMPA receptor closed state by acting as wedges between the transmembrane segments, thereby preventing gating rearrangements that are necessary for ion channel opening.
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Affiliation(s)
- Maria V Yelshanskaya
- Department of Biochemistry and Molecular Biophysics, Columbia University, 650 West 168(th) Street, New York, NY 10032, USA
| | - Appu K Singh
- Department of Biochemistry and Molecular Biophysics, Columbia University, 650 West 168(th) Street, New York, NY 10032, USA
| | - Jared M Sampson
- Department of Biochemistry and Molecular Biophysics, Columbia University, 650 West 168(th) Street, New York, NY 10032, USA
| | - Chamali Narangoda
- Chemistry Department, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, USA
| | - Maria Kurnikova
- Chemistry Department, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, USA
| | - Alexander I Sobolevsky
- Department of Biochemistry and Molecular Biophysics, Columbia University, 650 West 168(th) Street, New York, NY 10032, USA.
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Singh K, Shah YD, Luciano D, Friedman D, Devinsky O, Kothare SV. Safety and efficacy of perampanel in children and adults with various epilepsy syndromes: A single-center postmarketing study. Epilepsy Behav 2016; 61:41-45. [PMID: 27300147 DOI: 10.1016/j.yebeh.2016.05.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 05/05/2016] [Accepted: 05/05/2016] [Indexed: 11/17/2022]
Abstract
INTRODUCTION Perampanel is an AMPA receptor antagonist recently approved for the treatment of partial and generalized epilepsies with tonic-clonic seizures as an add-on therapy. METHODS This single-center postmarketing study retrospectively evaluated the efficacy of perampanel in patients with partial onset and other seizure types, with a special emphasis on its efficacy, safety, and tolerability. RESULTS Review of medical records revealed that adequate data were available on 101 patients taking perampanel. Fifty-seven patients were female. Sixteen patients were of pediatric age range. The average dose of perampanel was 6.5mg, and average treatment duration was 8.2months. After treatment, median seizure frequency reduction was 50% overall, 50% in children, and 33% in adults; 44% in primary generalized, 38% in secondarily generalized, and 33% in partial seizures. Responder rate (50% seizure frequency reduction) was 51% overall, 63% in children, and 49% in adults; 60% in partial seizures, 43% in secondarily generalized tonic-clonic seizures, 53% in primary generalized tonic-clonic seizures, and 56% in other seizure types. Seizure freedom was attained in 6% of cases. Most common adverse events were sleepiness/fatigue (35%), behavioral problems (30%), and dizziness (22%). Adverse events were correlated with dosage. Average dose was 7.3mg in patients with adverse events vs. 5.5mg in those without adverse events. Patients who developed fatigue, cognitive decline, headaches, and weight gain were more likely to discontinue perampanel than those patients who experienced coordination issues and behavioral problems. CONCLUSIONS These findings suggest that perampanel is safe, well-tolerated, and effective in treatment of various types of adult and pediatric epilepsy syndromes. Fatigue, cognitive decline, headache and weight gain were the main causes of perampanel discontinuation.
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Affiliation(s)
- Kanwaljit Singh
- Division of Pediatric Neurology, University of Massachusetts Medical School, USA
| | - Yash D Shah
- Comprehensive Epilepsy Center, Department of Neurology, NYU Langone Medical Center, USA
| | - Daniel Luciano
- Comprehensive Epilepsy Center, Department of Neurology, NYU Langone Medical Center, USA
| | - Daniel Friedman
- Comprehensive Epilepsy Center, Department of Neurology, NYU Langone Medical Center, USA
| | - Orrin Devinsky
- Comprehensive Epilepsy Center, Department of Neurology, NYU Langone Medical Center, USA
| | - Sanjeev V Kothare
- Comprehensive Epilepsy Center, Department of Neurology, NYU Langone Medical Center, USA.
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Abstract
Mosquito-borne viruses are important causes of death and long-term neurologic disability due to encephalomyelitis. Studies of mice infected with the alphavirus Sindbis virus have shown that outcome is dependent on the age and genetic background of the mouse and virulence of the infecting virus. Age-dependent susceptibility reflects the acquisition by neurons of resistance to virus replication and virus-induced cell death with maturation. In mature mice, the populations of neurons most susceptible to infection are in the hippocampus and anterior horn of the spinal cord. Hippocampal infection leads to long-term memory deficits in mice that survive, while motor neuron infection can lead to paralysis and death. Neuronal death is immune-mediated, rather than a direct consequence of virus infection, and associated with entry and differentiation of pathogenic T helper 17 cells in the nervous system. To modulate glutamate excitotoxicity, mice were treated with an N-methyl-D-aspartate receptor antagonist, α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptor antagonists or a glutamine antagonist. The N-methyl-D-aspartate receptor antagonist MK-801 protected hippocampal neurons but not motor neurons, and mice still became paralyzed and died. α-Amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptor antagonists GYKI-52466 and talampanel protected both hippocampal and motor neurons and prevented paralysis and death. Glutamine antagonist 6-diazo-5-l-norleucine protected hippocampal neurons and improved memory generation in mice surviving infection with an avirulent virus. Surprisingly, in all cases protection was associated with inhibition of the antiviral immune response, reduced entry of inflammatory cells into the central nervous system, and delayed virus clearance, emphasizing the importance of treatment approaches that include prevention of immunopathologic damage.
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Affiliation(s)
- Diane E Griffin
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, 21205, USA.
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Sang CN, Ramadan NM, Wallihan RG, Chappell AS, Freitag FG, Smith TR, Silberstein SD, Johnson KW, Phebus LA, Bleakman D, Ornstein PL, Arnold B, Tepper SJ, Vandenhende F. LY293558, a Novel AMPA/GluR5 Antagonist, is Efficacious and Well-Tolerated in Acute Migraine. Cephalalgia 2016; 24:596-602. [PMID: 15196302 DOI: 10.1111/j.1468-2982.2004.00723.x] [Citation(s) in RCA: 127] [Impact Index Per Article: 15.9] [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: 11/27/2022]
Abstract
Glutamatergic hyperactivity is implicated migraine pathogenesis. Also, LY293558, an α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA)/kainate (KA) receptor antagonist, is effective in preclinical models of migraine. We therefore tested LY293558 in acute migraine. We conducted a randomized, triple-blind, parallel-group, double-dummy, multicentre trial of 1.2 mg/kg intravenous (IV) LY293558, 6 mg subcutaneous (SC) sumatriptan, or placebo in the treatment of acute migraine. The primary efficacy variable was the headache response rate, i.e. headache score improvement from moderate/severe at baseline to mild/none at 2 h. Of 45 enrolled patients, 44 patients (20M:24F; mean age ± SD = 40 ± 9 years) completed the study. Response rates were 69% for LY293558 ( P = 0.017 vs. placebo), 86% for sumatriptan ( P < 0.01 vs. placebo) and 25% for placebo. LY293558 and sumatriptan were superior to placebo ( P < 0.01 for all comparisons) on all other measures of improvement in pain and migraine associated symptoms. Fifteen percent of patients who took LY293558 reported adverse events (AEs) ( n = 2; one mild, one severe). Fifty-three percent of patients who took sumatriptan ( n = 8; seven mild, one moderate) and 31% of those who received placebo reported AEs ( n = 5; four mild, one severe). The efficacy and safety results of LY293558 in this small migraine proof of concept trial, together with supportive preclinical data, provide evidence for a potential role of nonvasoactive AMPA/KA antagonists in treating migraine. Larger trials are needed to further test the hypothesis.
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Affiliation(s)
- C N Sang
- Massachusetts General Hospital, Boston, USA
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Pham TH, Mendez-David I, Defaix C, Guiard BP, Tritschler L, David DJ, Gardier AM. Ketamine treatment involves medial prefrontal cortex serotonin to induce a rapid antidepressant-like activity in BALB/cJ mice. Neuropharmacology 2016; 112:198-209. [PMID: 27211253 DOI: 10.1016/j.neuropharm.2016.05.010] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [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: 01/26/2016] [Revised: 05/09/2016] [Accepted: 05/15/2016] [Indexed: 11/18/2022]
Abstract
Unlike classic serotonergic antidepressant drugs, ketamine, an NMDA receptor antagonist, exhibits a rapid and persistent antidepressant (AD) activity, at sub-anaesthetic doses in treatment-resistant depressed patients and in preclinical studies in rodents. The mechanisms mediating this activity are unclear. Here, we assessed the role of the brain serotonergic system in the AD-like activity of an acute sub-anaesthetic ketamine dose. We compared ketamine and fluoxetine responses in several behavioral tests currently used to predict anxiolytic/antidepressant-like potential in rodents. We also measured their effects on extracellular serotonin levels [5-HT]ext in the medial prefrontal cortex (mPFCx) and brainstem dorsal raphe nucleus (DRN), a serotonergic nucleus involved in emotional behavior, and on 5-HT cell firing in the DRN in highly anxious BALB/cJ mice. Ketamine (10 mg/kg i.p.) had no anxiolytic-like effect, but displayed a long lasting AD-like activity, i.e., 24 h post-administration, compared to fluoxetine (18 mg/kg i.p.). Ketamine (144%) and fluoxetine (171%) increased mPFCx [5-HT]ext compared to vehicle. Ketamine-induced AD-like effect was abolished by a tryptophan hydroxylase inhibitor, para-chlorophenylalanine (PCPA) pointing out the role of the 5-HT system in its behavioral activity. Interestingly, increase in cortical [5-HT]ext following intra-mPFCx ketamine bilateral injection (0.25 μg/side) was correlated with its AD-like activity as measured on swimming duration in the FST in the same mice. Furthermore, pre-treatment with a selective AMPA receptor antagonist (intra-DRN NBQX) blunted the effects of intra-mPFCx ketamine on both the swimming duration in the FST and mPFCx [5-HT]ext suggesting that the AD-like activity of ketamine required activation of DRN AMPA receptors and recruited the prefrontal cortex/brainstem DRN neural circuit in BALB/c mice. These results confirm a key role of cortical 5-HT release in ketamine's AD-like activity following the blockade of glutamatergic NMDA receptors. Tight interactions between mPFCx glutamatergic and serotonergic systems may explain the differences in this activity between ketamine and fluoxetine in vivo. This article is part of the Special Issue entitled 'Ionotropic glutamate receptors'.
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Affiliation(s)
- T H Pham
- Université Paris-Saclay, Univ. Paris-Sud, Faculté de Pharmacie, INSERM UMR-S 1178, Chatenay Malabry, 92290, France
| | - I Mendez-David
- Université Paris-Saclay, Univ. Paris-Sud, Faculté de Pharmacie, INSERM UMR-S 1178, Chatenay Malabry, 92290, France
| | - C Defaix
- Université Paris-Saclay, Univ. Paris-Sud, Faculté de Pharmacie, INSERM UMR-S 1178, Chatenay Malabry, 92290, France
| | - B P Guiard
- UMR5169 CNRS "Centre de Recherches sur la Cognition Animale », Toulouse, 31062, France
| | - L Tritschler
- Université Paris-Saclay, Univ. Paris-Sud, Faculté de Pharmacie, INSERM UMR-S 1178, Chatenay Malabry, 92290, France
| | - D J David
- Université Paris-Saclay, Univ. Paris-Sud, Faculté de Pharmacie, INSERM UMR-S 1178, Chatenay Malabry, 92290, France
| | - A M Gardier
- Université Paris-Saclay, Univ. Paris-Sud, Faculté de Pharmacie, INSERM UMR-S 1178, Chatenay Malabry, 92290, France.
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Tu HY, Chiao CC. Cx36 expression in the AII-mediated rod pathway is activity dependent in the developing rabbit retina. Dev Neurobiol 2016; 76:473-86. [PMID: 26084632 DOI: 10.1002/dneu.22320] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 04/21/2015] [Revised: 06/09/2015] [Accepted: 06/11/2015] [Indexed: 12/20/2022]
Abstract
Gap junctions are composed of connexin 36 (Cx36) and play a critical role in the rod photoreceptor signaling pathways of the vertebrate retina. Despite the fact that their connection and modulation in various rod pathways have been extensively studied in adult animals, little is known about the contribution and regulation of gap junctions to the development of the AII amacrine cell (AC)-mediated rod pathway. Using immunohistochemistry and microinjection, this study demonstrates a steady increase in relative Cx36 protein expression in both plexiform layers of the rabbit retina at around the time of eye opening. However, immediately after eye opening, most Cx36 immunoreactive AII ACs show no gap junction coupling pattern to neighboring cells and it is not until the third postnatal week that AII cells begin to exhibit an adult-like tracer-coupling pattern. Moreover, studies using dark-rearing and AMPA receptor blockade during postnatal development both revealed that relative levels of Cx36 immunoreactivity in AII ACs were increased when neural activity was inhibited. Our findings suggest that Cx36 expression in the AII-mediated rod pathway is activity dependent in the developing rabbit retina.
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Affiliation(s)
- Hung-Ya Tu
- Institute of Molecular Medicine, National Tsing Hua University, Hsinchu, 30013, Taiwan
- Department of Life Science, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Chuan-Chin Chiao
- Institute of Molecular Medicine, National Tsing Hua University, Hsinchu, 30013, Taiwan
- Department of Life Science, National Tsing Hua University, Hsinchu, 30013, Taiwan
- Institute of Systems Neuroscience, National Tsing Hua University, Hsinchu, 30013, Taiwan
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White SL, Ortinski PI, Friedman SH, Zhang L, Neve RL, Kalb RG, Schmidt HD, Pierce RC. A Critical Role for the GluA1 Accessory Protein, SAP97, in Cocaine Seeking. Neuropsychopharmacology 2016; 41:736-50. [PMID: 26149358 PMCID: PMC4707820 DOI: 10.1038/npp.2015.199] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [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: 12/26/2014] [Revised: 06/05/2015] [Accepted: 06/06/2015] [Indexed: 01/05/2023]
Abstract
A growing body of evidence indicates that the transport of GluA1 subunit-containing calcium-permeable AMPA receptors (CP-AMPARs) to synapses in subregions of the nucleus accumbens promotes cocaine seeking. Consistent with these findings, the present results show that administration of the CP-AMPAR antagonist, Naspm, into the caudal lateral core or caudal medial shell of the nucleus accumbens attenuated cocaine priming-induced reinstatement of drug seeking. Moreover, viral-mediated overexpression of 'pore dead' GluA1 subunits (via herpes simplex virus (HSV) GluA1-Q582E) in the lateral core or medial shell attenuated the reinstatement of cocaine seeking. The overexpression of wild-type GluA1 subunits (via HSV GluA1-WT) in the medial shell, but not the lateral core, enhanced the reinstatement of cocaine seeking. These results indicate that activation of GluA1-containing AMPARs in subregions of the nucleus accumbens reinstates cocaine seeking. SAP97 and 4.1N are proteins involved in GluA1 trafficking to and stabilization in synapses; SAP97-GluA1 interactions also influence dendritic growth. We next examined potential roles of SAP97 and 4.1N in cocaine seeking. Viral-mediated expression of a microRNA that reduces SAP97 protein expression (HSV miSAP97) in the medial accumbens shell attenuated cocaine seeking. In contrast, a virus that overexpressed a dominant-negative form of a 4.1N C-terminal domain (HSV 4.1N-CTD), which prevents endogenous 4.1N binding to GluA1 subunits, had no effect on cocaine seeking. These results indicate that the GluA1 subunit accessory protein SAP97 may represent a novel target for pharmacotherapeutic intervention in the treatment of cocaine craving.
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Affiliation(s)
- Samantha L White
- Department of Psychiatry, Center for Neurobiology and Behavior, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - Pavel I Ortinski
- Department of Pharmacology, Physiology and Neuroscience, University of South Carolina School of Medicine, Columbia, SC, USA
| | - Shayna H Friedman
- Department of Psychiatry, Center for Neurobiology and Behavior, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - Lei Zhang
- Department of Neurology, Perelman School of Medicine at the University of Pennsylvania, Abramson Research Center 814, Philadelphia, PA, USA
| | - Rachael L Neve
- Department of Brain and Cognitive Sciences, McGovern Institute for Brain Research at the Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Robert G Kalb
- Department of Neurology, Perelman School of Medicine at the University of Pennsylvania, Abramson Research Center 814, Philadelphia, PA, USA
| | - Heath D Schmidt
- Department of Psychiatry, Center for Neurobiology and Behavior, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - R Christopher Pierce
- Department of Psychiatry, Center for Neurobiology and Behavior, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
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Abstract
In vitro neuronal cultures have become a popular method with which to probe network-level neuronal dynamics and phenomena in controlled laboratory settings. One of the key dynamics of interest in these in vitro studies has been the extent to which cultured networks display properties indicative of learning. Here we demonstrate the effects of a high frequency electrical stimulation signal in training cultured networks of cortical neurons. Networks receiving this training signal displayed a time-dependent increase in the response to a low frequency probing stimulation, particularly in the time window of 20–50 ms after stimulation. This increase was found to be statistically significant as compared to control networks that did not receive training. The timing of this increase suggests potentiation of synaptic mechanisms. To further investigate this possibility, we leveraged the powerful Cox statistical connectivity method as previously investigated by our group. This method was used to identify and track changes in network connectivity strength.
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Affiliation(s)
- Franz Hamilton
- Department of Electrical and Computer Engineering, George Mason University, Fairfax, VA, United States of America
| | - Robert Graham
- Department of Bioengineering, George Mason University, Fairfax, VA, United States of America
| | - Lydia Luu
- Department of Bioengineering, George Mason University, Fairfax, VA, United States of America
| | - Nathalia Peixoto
- Department of Electrical and Computer Engineering, George Mason University, Fairfax, VA, United States of America
- Department of Bioengineering, George Mason University, Fairfax, VA, United States of America
- * E-mail:
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Dhir A, Chavda V. Pre- and post-exposure talampanel (GYKI 53773) against kainic acid seizures in neonatal rats. Pharmacol Rep 2015; 68:190-5. [PMID: 26721372 DOI: 10.1016/j.pharep.2015.08.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 05/29/2015] [Revised: 08/11/2015] [Accepted: 08/19/2015] [Indexed: 12/23/2022]
Abstract
BACKGROUND AMPA receptors play an important role in the neurobiology of neonatal epilepsy. The present study evaluated the effect of talampanel, a potent and selective non-competitive antagonist of AMPA receptors, against kainic acid-induced continuous seizures (status epilepticus) and other behavioral abnormalities in neonatal rats. METHODS Kainic acid was administered at doses of 2 or 4mg/kg, ip to induce seizures and status epilepticus in postnatal 7 days old rat neonates in pre- and post-exposure studies, respectively. RESULTS Intraperitoneal administration of kainic acid (2 or 4mg/kg) resulted in forelimb/hind-limb scratching defined as automatism, continuous generalized tonic-clonic seizures with loss of righting reflex suggesting status epilepticus and tonic extension. Pre-exposure of talampanel (2.5-10mg/kg, ip) 30min before kainic acid did not affect the onset of kainic acid convulsions. Talampanel at 20mg/kg, ip delayed the commencement of tonic extension, but not status-induced by kainic acid. In contrast, talampanel (5 and 10mg/kg, ip) when administered 5min after kainic acid (4mg/kg, ip) postponed the onset of status epilepticus and tonic extension compared to vehicle treated group. Furthermore, talampanel (10mg/kg, ip) but not GYKI 52466 (20 or 50mg/kg, ip; a non-competitive AMPA/kainate receptor antagonist) stopped the ongoing status epilepticus when administered 10min after the administration of kainic acid. However, seizures re-occurred after 35.98±2.36min. CONCLUSION The present results suggested that talampanel is protective in kainic acid-induced neonatal status epilepticus model; however, the time of administration is a crucial factor in determining its effectiveness.
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Affiliation(s)
- Ashish Dhir
- Neuropharmacology Division, Institute of R&D, Gujarat Forensic Sciences University, Gandhinagar, India.
| | - Vishal Chavda
- Neuropharmacology Division, Institute of R&D, Gujarat Forensic Sciences University, Gandhinagar, India
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Liu TY, Cheng Y, Qin XY, Yu LC. Pharmacologically inhibiting GluR2 internalization alleviates neuropathic pain. Neurosci Bull 2015; 31:611-6. [PMID: 26248656 DOI: 10.1007/s12264-015-1556-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [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: 03/17/2015] [Accepted: 05/19/2015] [Indexed: 11/25/2022] Open
Abstract
Neuropathic pain is of serious clinical concern and only about half of patients achieve partial relief with currently-available treatments, so it is critical to find new drugs for this condition. Recently, the cellsurface trafficking of pain-related receptors has been suggested as an important mechanism underlying persistent neuropathic pain. Here, we used the short peptide GluA2-3y, which specifically inhibits the GluA2-dependent endocytosis of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors, and tested its anti-nociceptive effect in the periaqueductal grey (PAG) of intact rats and rats with neuropathic pain. Intra-PAG injection of 0.15, 1.5, 7.5, and 15 pmol of GluA2-3y induced dose-dependent increases in hindpaw withdrawal latencies to noxious thermal and mechanical stimuli in intact rats, suggesting that GluA2 cell-surface trafficking in the PAG is involved in pain modulation. Furthermore, GluA2-3y had much stronger anti-nociceptive effects in rats with neuropathic pain induced by sciatic nerve ligation. Interestingly, the intra-PAG injection of 15 pmol GluA2-3y had an analgesic effect similar to 10 μg (35 nmol) morphine in rats with neuropathic pain. Taken together, our results suggested that GluA2 trafficking in the PAG plays a critical role in pain modulation, and inhibiting GluA2 endocytosis with GluA2-3y has potent analgesic effects in rats with neuropathic pain. These findings strongly support the recent hypothesis that targeting receptor trafficking could be a new strategy for the treatment of neuropathic pain.
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Affiliation(s)
- Tao-Yan Liu
- Beijing Engineering Research Center of Food, Environment, and Health, Minzu University of China, Beijing, 100081, China
- College of Life and Environmental Sciences, Minzu University of China, Beijing, 100081, China
| | - Yong Cheng
- Laboratory of Neurobiology and State Key Laboratory of Biomembrane and Membrane Biotechnology, College of Life Sciences, Peking University, Beijing, 100871, China.
| | - Xiao-Yan Qin
- Beijing Engineering Research Center of Food, Environment, and Health, Minzu University of China, Beijing, 100081, China.
- College of Life and Environmental Sciences, Minzu University of China, Beijing, 100081, China.
| | - Long-Chuan Yu
- Laboratory of Neurobiology and State Key Laboratory of Biomembrane and Membrane Biotechnology, College of Life Sciences, Peking University, Beijing, 100871, China
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Stern S, Agudelo-Toro A, Rotem A, Moses E, Neef A. Chronaxie Measurements in Patterned Neuronal Cultures from Rat Hippocampus. PLoS One 2015; 10:e0132577. [PMID: 26186201 PMCID: PMC4506053 DOI: 10.1371/journal.pone.0132577] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 06/16/2015] [Indexed: 11/18/2022] Open
Abstract
Excitation of neurons by an externally induced electric field is a long standing question that has recently attracted attention due to its relevance in novel clinical intervention systems for the brain. Here we use patterned quasi one-dimensional neuronal cultures from rat hippocampus, exploiting the alignment of axons along the linear patterned culture to separate the contribution of dendrites to the excitation of the neuron from that of axons. Network disconnection by channel blockers, along with rotation of the electric field direction, allows the derivation of strength-duration (SD) curves that characterize the statistical ensemble of a population of cells. SD curves with the electric field aligned either parallel or perpendicular to the axons yield the chronaxie and rheobase of axons and dendrites respectively, and these differ considerably. Dendritic chronaxie is measured to be about 1 ms, while that of axons is on the order of 0.1 ms. Axons are thus more excitable at short time scales, but at longer time scales dendrites are more easily excited. We complement these studies with experiments on fully connected cultures. An explanation for the chronaxie of dendrites is found in the numerical simulations of passive, realistically structured dendritic trees under external stimulation. The much shorter chronaxie of axons is not captured in the passive model and may be related to active processes. The lower rheobase of dendrites at longer durations can improve brain stimulation protocols, since in the brain dendrites are less specifically oriented than axonal bundles, and the requirement for precise directional stimulation may be circumvented by using longer duration fields.
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Affiliation(s)
- Shani Stern
- Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot, Israel
| | - Andres Agudelo-Toro
- Department of Non-linear Dynamics, Max Planck Institute for Dynamics and Self-Organization and Bernstein Group ‘Biophysics of Neural Computation’, Göttingen, Germany
| | - Assaf Rotem
- Department of Physics and School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, United States of America
| | - Elisha Moses
- Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot, Israel
- * E-mail:
| | - Andreas Neef
- Department of Non-linear Dynamics, Max Planck Institute for Dynamics and Self-Organization and Bernstein Group ‘Biophysics of Neural Computation’, Göttingen, Germany
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