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Activation of mGluR5 attenuates NMDA-induced neurotoxicity through disruption of the NMDAR-PSD-95 complex and preservation of mitochondrial function in differentiated PC12 cells. Int J Mol Sci 2014; 15:10892-907. [PMID: 24941251 PMCID: PMC4100187 DOI: 10.3390/ijms150610892] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Revised: 05/16/2014] [Accepted: 05/30/2014] [Indexed: 01/05/2023] Open
Abstract
Glutamate-mediated toxicity is implicated in various neuropathologic conditions, and activation of ionotropic and metabotropic glutamate receptors is considered to be the most important mechanism. It has been reported that pharmacological saturation of metabotropic glutamate receptors (mGluRs) can facilitate N-methyl-d-aspartate receptor (NMDAR) related signaling cascades, but the mechanism leading to mGluR-NMDAR interactions in excitotoxic neuronal injury has remained unidentified. In the present study, we investigated the role of mGluR5 in the regulation of N-methyl-d-aspartate (NMDA)-induced excitotoxicity in differentiated PC12 cells. We found that activation of mGluR5 with the specific agonist R,S-2-chloro-5-hydroxyphenylglycine (CHPG) increased cell viability and inhibited lactate dehydrogenase (LDH) release in a dose-dependent manner. CHPG also inhibited an increase in the Bax/Bcl-2 ratio, attenuated cleavage of caspase-9 and caspase-3, and reduced apoptotic cell death after NMDA treatment. The NMDA-induced mitochondrial dysfunction, as indicated by mitochondrial reactive oxygen species (ROS) generation, collapse of mitochondrial membrane potential (MMP), and cytochrome c release, was also partly prevented by CHPG treatment. Furthermore, CHPG blocked the NMDA-induced interaction of NMDAR with postsynaptic density protein-95 (PSD-95), but had no effects on intracellular calcium concentrations. All these results indicated that activation of mGluR5 protects differentiated PC12 cells from NMDA-induced neuronal excitotoxicity by disrupting NMDAR-PSD-95 interaction, which might be an ideal target for investigating therapeutic strategies in various neurological diseases where excitotoxicity may contribute to their pathology.
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Rodrigo AC, Rivilla I, Pérez-Martínez FC, Monteagudo S, Ocaña V, Guerra J, García-Martínez JC, Merino S, Sánchez-Verdú P, Ceña V, Rodríguez-López J. Efficient, Non-Toxic Hybrid PPV-PAMAM Dendrimer as a Gene Carrier for Neuronal Cells. Biomacromolecules 2011; 12:1205-13. [DOI: 10.1021/bm1014987] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Ana C. Rodrigo
- Facultad de Química, Universidad de Castilla-La Mancha, Avda. Camilo José Cela 10, 13071-Ciudad Real, Spain
| | - Iván Rivilla
- Facultad de Química, Universidad de Castilla-La Mancha, Avda. Camilo José Cela 10, 13071-Ciudad Real, Spain
| | | | | | - Vanessa Ocaña
- Unidad Asociada Neurodeath, Facultad de Medicina, CSIC-UCLM, Universidad de Castilla-La Mancha, Avda. Almansa 14, 02006-Albacete, Spain
| | - Javier Guerra
- Facultad de Química, Universidad de Castilla-La Mancha, Avda. Camilo José Cela 10, 13071-Ciudad Real, Spain
- NanoDrugs, S. L., P° de la Innovación 1, 02071-Albacete, Spain
| | - Joaquín C. García-Martínez
- Facultad de Química, Universidad de Castilla-La Mancha, Avda. Camilo José Cela 10, 13071-Ciudad Real, Spain
| | - Sonia Merino
- Facultad de Química, Universidad de Castilla-La Mancha, Avda. Camilo José Cela 10, 13071-Ciudad Real, Spain
| | - Prado Sánchez-Verdú
- Facultad de Química, Universidad de Castilla-La Mancha, Avda. Camilo José Cela 10, 13071-Ciudad Real, Spain
| | - Valentín Ceña
- Unidad Asociada Neurodeath, Facultad de Medicina, CSIC-UCLM, Universidad de Castilla-La Mancha, Avda. Almansa 14, 02006-Albacete, Spain
- CIBERNED, Instituto de salud Carlos III, C/Sinesio Delgado 6, 28071-Madrid, Spain
| | - Julián Rodríguez-López
- Facultad de Química, Universidad de Castilla-La Mancha, Avda. Camilo José Cela 10, 13071-Ciudad Real, Spain
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Sureda FX, Mallol J. The NMDA Receptor: Beyond Anaesthetic Action. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2003; 523:191-200. [PMID: 15088851 DOI: 10.1007/978-1-4419-9192-8_17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Francesc X Sureda
- Unitat de Farmacologia, Departament de Ciències Mèdiques Básiques, Facultat de Medicina i Ciències de la Salut, Universitat Rovira i Virgili, c./St. Llorenç 21 43201 Reus (Tarragona) Spain
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Viu E, Zapata A, Capdevila J, Skolnick P, Trullas R. Glycine(B) receptor antagonists and partial agonists prevent memory deficits in inhibitory avoidance learning. Neurobiol Learn Mem 2000; 74:146-60. [PMID: 10933900 DOI: 10.1006/nlme.1999.3947] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Activation of N-methyl-d-aspartate (NMDA) receptors has been hypothesized to mediate certain forms of learning and memory. This hypothesis is based on the ability of competitive and uncompetitive NMDA receptor antagonists to disrupt learning. We investigated the effects of glycine site antagonists and partial agonists on deficits of acquisition (learning) and consolidation (memory) in a single trial inhibitory avoidance learning paradigm. Posttraining administration of either hypoxia (exposure to 7% oxygen) or the convulsant drug pentylenetetrazole (PTZ) (45 mg/kg) to mice impaired consolidation without producing neuronal cell death. Pretreatment with the competitive glycine antagonist 7-chlorokynurenic acid (7KYN) and the glycine partial agonists 1-aminocyclopropanecarboxylic acid (ACPC) and (+)HA-966 prevented memory deficits induced by hypoxia and PTZ, but did not affect scopolamine-induced learning impairment. In addition, ACPC prevented consolidation deficits evoked by a nonexcitotoxic concentration of l-trans-pyrrolidine-2, 4-dicarboxylate, a competitive inhibitor of glutamate transport that increases extracellular levels of glutamate. Moreover, (+)HA-966, 7KYN, and ACPC facilitated both acquisition and consolidation of inhibitory avoidance training, an effect that was dose-dependent and reversed by glycine. These results indicate that memory deficits induced by both hypoxia and PTZ involve NMDA receptor activation. Furthermore, the present findings demonstrate that glycine site antagonists and partial agonists prevent memory deficits of inhibitory avoidance learning by affecting consolidation, but not acquisition processes.
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Affiliation(s)
- E Viu
- Neurobiology Unit, IIBB/IDIBAPS, CSIC, Rossello 161, 08034, Barcelona, Spain
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Camins A, Sureda FX, Gabriel C, Pallàs M, Escubedo E, Camarasa J. Effect of 1-methyl-4-phenylpyridinium (MPP+) on mitochondrial membrane potential in cerebellar neurons: interaction with the NMDA receptor. J Neural Transm (Vienna) 1998; 104:569-77. [PMID: 9444558 DOI: 10.1007/bf01291876] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The effect of MPP+, a dopaminergic neurotoxin, in mitochondrial membrane potential was investigated in dissociated cerebellar granule cells using rhodamine 123 and flow cytometry. MPP+ (1 mM) decreased the mitochondrial membrane potential by 30%. Antagonists of the NMDA receptor complex, such as MK-801 (IC50 value of 20.92 +/- 0.02 nM), 5,7-dichlorokynurenic acid (IC50 value of 6.46 +/- 1.06 microM) and D-AP5 (IC50 value of 8.29 +/- 0.63 microM), inhibited the action of MPP+. Neither NBQX, nor riluzole, nor desipramine modified the action of MPP+. Dibucaine restored the basal values of mitochondrial membrane potential altered by MPP+. Since, in the presence of NMDA, MPP+ antagonized the effect of this total agonist, it can be concluded that, in this preparation, MPP+ interacts with the NMDA receptor complex as a partial agonist. This interaction could be the result of an allosteric modulation of the NMDA receptor complex by MPP+. The decrease of mitochondrial membrane potential induced by MPP+ is antagonized by dibucaine, suggesting that this effect is mediated by an activation of phospholipase A2.
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Affiliation(s)
- A Camins
- Unitat de Farmacologia i Farmacognosia, Facultat de Farmacia, Universitat de Barcelona, Nucli Universitari de Pedralbes, Spain
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