4.6 Article

Defects in Mouse Cortical Glutamate Uptake Can Be Unveiled In Vivo by a Two-in-One Quantitative Microdialysis

期刊

ACS CHEMICAL NEUROSCIENCE
卷 13, 期 1, 页码 134-142

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acschemneuro.1c00634

关键词

glutamate; uptake; motor cortex; quantitative microdialysis; reverse dialysis; in vivo; mouse

资金

  1. AFM-Telethon [19920]
  2. Fondation pour la Recherche Medicale [PLP201910009933]
  3. Institut National de la Santeet de la Recherche Medicale (INSERM)
  4. Centre National de la Recherche Scientifique (CNRS)
  5. Paris Ile-de-France Region
  6. Universite Claude Bernard Lyon 1

向作者/读者索取更多资源

Extracellular glutamate levels are regulated by efficient transporters, and dysfunction of these transporters can lead to neuronal hyperexcitability and neurological diseases. This study utilized a two-in-one in vivo microdialysis approach to measure glutamate uptake ability and extracellular levels in a transgenic mouse model of human disease. The results showed significant differences in neurotransmitter uptake and levels, highlighting the importance of this sensitive and robust technique for studying glutamate transport in vivo.
Extracellular glutamate levels are maintained low by efficient transporters, whose dysfunction can cause neuronal hyperexcitability, excitotoxicity, and neurological disease. While many methods estimate glutamate uptake in vitro/ex vivo, a limited number of techniques address glutamate transport in vivo. Here, we used in vivo microdialysis in a two-in-one approach combining reverse dialysis of isotopic glutamate to measure uptake ability and zero-flow (ZF) methods to quantify extracellular glutamate levels. The complementarity of both techniques is discussed on methodological and anatomical basis. We used a transgenic mouse model of human disease, expressing low levels of the EAAT-2/GLT1 glutamate transporter, to validate our approach in a relevant animal model. As expected, isotopic analysis revealed an overall decrease in glutamate uptake, while the ZF method unveiled higher extracellular glutamate levels in these mice. We propose a sensitive and expedite two-in-one microdialysis approach that is sufficiently robust to reveal significant differences in neurotransmitter uptake and extracellular levels through the analysis of a relatively low number of animals.

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