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• W2012970377 endingPage "e25350" @default.
• W2012970377 startingPage "e25350" @default.
• W2012970377 abstract "Ionotropic glutamate α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) receptors are the major mediators of fast synaptic neurotransmission. In this work, we used primary cortical cultures from rats as a model system to study AMPA receptor regulation during in vitro cell maturation and after synaptic activity modifications. The levels of AMPA receptor mRNA and protein, along with the alternative splicing and RNA editing of the AMPA receptor subunit (GluR1-4) mRNAs, were analyzed in immature (DIV5) and mature (DIV26) rat neuronal cultures. We observed an increase in the expression of all four AMPA receptor subunits during in vitro neuronal maturation. This finding might be due to the formation of new synapses between neurons during the development of a complex neuronal network. We also analyzed the effects of stimulation (KCl and glutamate) and inhibition (APV/TTX) on rat mature neuronal cultures (DIV26): stimulation with KCl led to an overall down-regulation of GluR1 and GluR3 AMPA receptor subunits and an up-regulation of the GluR2 subunit. Similarly, glutamate treatment induced a significant down-regulation of GluR1 together with an up-regulation of GluR2. In contrast, the chronic blockade of neuronal activity that resulted from APV/TTX treatment up-regulated GluR1 and GluR3 with a parallel down-regulation of GluR2 and GluR4. RNA editing at the R/G site increased during neuronal cell maturation for all AMPA receptors (from 8-39% at DIV5 to 28-67% at DIV26). Unexpectedly, all the treatments tested induced a marked reduction (ranging from -9% to -52%) of R/G editing levels in mature neurons, primarily for the mRNA flip variant. In summary, we showed that cultured rat cortical neurons are able to vary the stoichiometric ratios of the AMPA receptor subunits and to control post-transcriptional processes to adapt fast synaptic transmission under different environmental conditions." @default.
• W2012970377 created "2016-06-24" @default.
• W2012970377 creator A5013063447 @default.
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• W2012970377 date "2011-09-22" @default.
• W2012970377 modified "2023-10-14" @default.
• W2012970377 title "AMPA Receptor Regulation at the mRNA and Protein Level in Rat Primary Cortical Cultures" @default.
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• W2012970377 doi "https://doi.org/10.1371/journal.pone.0025350" @default.
• W2012970377 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3178644" @default.
• W2012970377 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21966506" @default.
• W2012970377 hasPublicationYear "2011" @default.
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