Novel regulation of the synthesis of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor subunit gluA1 by carnitine palmitoyltransferase 1C (CPT1C) in the hippocampus
Author
Fadó Andrés, Rut
Soto, David
Miñano Molina, Alfredo Jesús
Pozo Ariza, Macarena
Carrasco, Patricia
Yefimenko, Natalia
Rodríguez-Álvarez, José
Casals i Farré, Núria
Publication date
2015-10-16ISSN
0021-9258
Abstract
The regulation of AMPA-type receptor (AMPAR) abundance in the postsynaptic membrane is an important mechanism involved in learning and memory formation. Recent data suggest that one of the constituents of the AMPAR complex is carnitine palmitoyltransferase 1C (CPT1C), a brain-specific isoform located in the endoplasmic reticulum of neurons. Previous results had demonstrated that CPT1C deficiency disrupted spine maturation in hippocampal neurons and impaired spatial learning, but the role of CPT1C in AMPAR physiology had remained mostly unknown. In the present study, we show that CPT1C binds GluA1 and GluA2 and that the three proteins have the same expression profile during neuronal maturation. Moreover, in hippocampal neurons of CPT1C KO mice, AMPAR-mediated miniature excitatory postsynaptic currents and synaptic levels of AMPAR subunits GluA1 and GluA2 are significantly reduced. We show that AMPAR expression is dependent on CPT1C levels because total protein levels of GluA1 and GluA2 are decreased in CPT1C KO neurons and are increased in CPT1C-overexpressing neurons, whereas other synaptic proteins remain unaltered. Notably, mRNA levels of AMPARs remained unchanged in those cultures, indicating that CPT1C is post-transcriptionally involved. We demonstrate that CPT1C is directly involved in the de novo synthesis of GluA1 and not in protein degradation. Moreover, in CPT1C KO cultured neurons, GluA1 synthesis after chemical long term depression was clearly diminished, and brain-derived neurotrophic factor treatment was unable to phosphorylate the mammalian target of rapamycin (mTOR) and stimulate GluA1 protein synthesis. These data newly identify CPT1C as a regulator of AMPAR translation efficiency and therefore also synaptic function in the hippocampus.
Document Type
Others
Document version
Published version
Language
English
Subject (CDU)
61 - Medical sciences
Keywords
Aprenentatge -- Aspectes fisiològics
Aprenentatge cognitiu
Memòria -- Aspectes fisiològics
Aprendizaje -- Aspectos fisiológicos
Aprendizaje cognitivo
Memoria -- Aspectos fisiológicos
Learning -- Physiological aspects
Cognitive learning
Memory -- Physiological aspects
Pages
13
Publisher
American Society for Biochemistry and Molecular Biology
Collection
290; 42
Is part of
Journal of Biological Chemistry
Citation
Fadó, Rut; Soto, David; Miñano-Molina, Alfredo J. [et al.]. Novel regulation of the synthesis of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor subunit gluA1 by carnitine palmitoyltransferase 1C (CPT1C) in the hippocampus. Journal of Biological Chemistry, 2015, 290(42), p. 25548-25560. Disponible en: <https://www.jbc.org/article/S0021-9258(20)44571-5/fulltext>. Fecha de acceso: 22 abr. 2021. DOI: 10.1074/jbc.M115.681064
This item appears in the following Collection(s)
- Ciències de la Salut [745]
Rights
Creative Commons Attribution (CC BY 4.0)
Except where otherwise noted, this item's license is described as https://creativecommons.org/licenses/by/4.0/