Synaptic and extrasynaptic distribution of NMDA receptors in the cortex of Alzheimer's disease patients
BACKGROUNDSynaptic and extrasynaptic distribution of N-methyl-D-aspartate receptors (NMDARs) has not been addressed in the brain from Alzheimer<acute accent>s disease (AD) subjects, despite their contribution to neurodegeneration.METHODSWe have developed a protocol to isolate synaptic and extr...
| Autores: | , , , , , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2024 |
| País: | España |
| Recursos: | Instituto de Investigación Biomédica y Sanitaria de Alicante (ISABIAL) |
| Repositorio: | r-ISABIAL. Repositorio Institucional de Producción Científica del Instituto de Investigación Biomédica y Sanitaria de Alicante |
| OAI Identifier: | oai:isabial.fundanetsuite.com:p10441 |
| Acesso em linha: | https://isabial.portalinvestigacion.com/publicaciones10441 https://alz-journals.onlinelibrary.wiley.com/doi/10.1002/alz.14125 |
| Access Level: | acceso abierto |
| Palavra-chave: | Alzheimer<acute accent>s disease extrasynaptic GluN1 GluN2A GluN2B GluN3A human NMDA Tyr1336 Tyr1472 |
| Resumo: | BACKGROUNDSynaptic and extrasynaptic distribution of N-methyl-D-aspartate receptors (NMDARs) has not been addressed in the brain from Alzheimer<acute accent>s disease (AD) subjects, despite their contribution to neurodegeneration.METHODSWe have developed a protocol to isolate synaptic and extrasynaptic membranes from controls and AD frontal cortex. We characterized the distribution of the NMDAR subunits GluN2B, GluN2A, GluN1, and GluN3A, as well as post-translational modifications, such as phosphorylation and glycosylation.RESULTSLower levels of synaptic GluN2B and GluN2A were found in AD fractions, while extrasynaptic GluN2B and GluN1 levels were significantly higher; GluN3A distribution remained unaffected in AD. We also identified different glycoforms of GluN2B and GluN2A in extrasynaptic membranes. Synaptic Tyr1472 GluN2B phosphorylation was significantly lower in AD fractions.DISCUSSIONReduction of synaptic NMDAR subunits, particularly for GluN2B, is likely to contribute to synaptic transmission failure in AD. Additionally, the increment of extrasynaptic NMDAR subunits could favor the activation of excitotoxicity in AD.Highlights New protocol to isolate synaptic and extrasynaptic membranes from the human cortex. Low GluN2B and GluN2A levels in Alzheimer<acute accent>s disease (AD) synaptic membranes. High GluN2B and GluN1 levels in AD extrasynaptic membranes. Specific glycoforms of extrasynaptic GluN2B and GluN2A. Low phosphorylation at Tyr1472 in synaptic GluN2B in AD. |
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