Abstract
The contribution of excitatory amino acids (AA) to ischemic brain injury has been widely described. In addition, we reported that a mixture of non-excitatory AA at plasmatic concentrations turns irreversible the depression of synaptic transmission caused by hypoxia. Here, we describe that the presence of seven non-excitatory AA (L-alanine, L-glutamine, glycine, L-histidine, L-serine, taurine, and L-threonine) during hypoxia provokes an irreversible neuronal membrane depolarization, after an initial phase of hyperpolarization. The collapse of the membrane potential correlates with a great increase in fiber volley amplitude. Nevertheless, we show that the presence of all seven AA is not necessary to cause the irreversible loss of fEPSP after hypoxia and that the minimal combination of AA able to provoke a solid, replicable effect is the mixture of L-alanine, glycine, L-glutamine, and L-serine. Additionally, L-glutamine seems necessary but insufficient to induce these harmful effects. We also prove that the deleterious effects of the AA mixtures on field potentials during hypoxia depend on both the identity and concentration of the individual AA in the mixture. Furthermore, we find that the accumulation of AA in the whole slice does not determine the outcome caused by the AA mixtures on the synaptic transmission during hypoxia. Finally, results obtained using pharmacological inhibitors and specific substrates of AA transporters suggest that system N and the alanine-serine-cysteine transporter 2 (ASCT2) participate in the non-excitatory AA-mediated deleterious effects during hypoxia. Thus, these AA transporters might represent therapeutical targets for the treatment of brain ischemia.
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The data presented in this study are available on reasonable request from the corresponding author.
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Acknowledgements
The authors thank María José Asensio for amino acid analysis and José Barbado for technical assistance. We thank Prof. Sergei A. Kirov, Medical College of Georgia at Augusta University, GA, USA, for his valuable advice and comments.
Funding
This work was supported by MICIU (Ref.: PID2021-128133NB-I00/AEI/FEDER10.13039/501100011033). IAM was supported by a predoctoral fellowship from “Ministerio de Universidades” of the Spanish government (Ref.: FPU16/06368).
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Iris Álvarez-Merz, Jesús M. Hernández-Guijo and José M. Solís designed experiments; Iris Álvarez-Merz, María-Dolores Muñoz and José M. Solís performed experiments and analysed data; Iris Álvarez-Merz and José M. Solís wrote the manuscript, and all authors edited and approved the manuscript before submission.
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Álvarez-Merz, I., Muñoz, MD., Hernández-Guijo, J.M. et al. Identification of Non-excitatory Amino Acids and Transporters Mediating the Irreversible Synaptic Silencing After Hypoxia. Transl. Stroke Res. (2023). https://doi.org/10.1007/s12975-023-01192-y
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DOI: https://doi.org/10.1007/s12975-023-01192-y