Microglial self-defence mediated through GLT-1 and glutathione.

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  • Author(s): Persson M;Persson M; Rönnbäck L
  • Source:
    Amino acids [Amino Acids] 2012 Jan; Vol. 42 (1), pp. 207-19. Date of Electronic Publication: 2011 Mar 05.
  • Publication Type:
    Journal Article; Research Support, Non-U.S. Gov't; Review
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: Springer-Verlag Country of Publication: Austria NLM ID: 9200312 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1438-2199 (Electronic) Linking ISSN: 09394451 NLM ISO Abbreviation: Amino Acids Subsets: MEDLINE
    • Publication Information:
      Original Publication: Wien ; New York : Springer-Verlag, c1991-
    • Subject Terms:
      Excitatory Amino Acid Transporter 2/*metabolism ; Glutathione/*metabolism ; Microglia/*metabolism; Animals ; Humans
    • Abstract:
      Glutamate is stored in synaptic vesicles in presynaptic neurons. It is released into the synaptic cleft to provide signalling to postsynaptic neurons. Normally, the astroglial glutamate transporters GLT-1 and GLAST take up glutamate to mediate a high signal-to-noise ratio in the synaptic signalling, and also to prevent excitotoxic effects by glutamate. In astrocytes, glutamate is transformed into glutamine, which is safely transported back to neurons. However, in pathological conditions, such as an ischemia or virus infection, astroglial transporters are down-regulated which could lead to excitotoxicity. Lately, it was shown that even microglia can express glutamate transporters during pathological events. Microglia have two systems for glutamate transport: GLT-1 for transport into the cells and the x (c) (-) system for transport out of the cells. We here review results from our work and others, which demonstrate that microglia in culture express GLT-1, but not GLAST, and transport glutamate from the extracellular space. We also show that TNF-α can induce increased microglial GLT-1 expression, possibly associating the expression with inflammatory systems. Furthermore, glutamate taken up through GLT-1 may be used for direct incorporation into glutathione and to fuel the intracellular glutamate pool to allow cystine uptake through the x (c) (-) system. This can lead to a defence against oxidative stress and have an antiviral function.
    • Accession Number:
      0 (Excitatory Amino Acid Transporter 2)
      GAN16C9B8O (Glutathione)
    • Publication Date:
      Date Created: 20110305 Date Completed: 20120427 Latest Revision: 20131121
    • Publication Date:
      20231215
    • Accession Number:
      10.1007/s00726-011-0865-7
    • Accession Number:
      21373770