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Is there a role for glutamate-mediated excitotoxicity in inflammation-induced depression?

  • Translational Neurosciences - Review article
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Abstract

Chronic inflammation in physically ill patients is often associated with the development of symptoms of depression. The mechanisms that are responsible for inflammation-associated depression have been elucidated over the last few years. Kynurenine produced from tryptophan in a reaction catabolized by indoleamine 2,3 dioxygenase is transported into the brain where it is metabolized by microglial enzymes into a number of neurotropic compounds including quinolinic acid, an agonist of N-methyl-d-aspartate receptors. Quinolinic acid can synergize with glutamate released by activated microglia. This chain of events opens the possibility to treat inflammation-induced depression using therapies that target the transport of kynurenine through the blood–brain barrier, the production of quinolinic acid and glutamate by activated microglia, or the efflux of glutamate from the brain to the blood.

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Acknowledgments

This work was supported by the University of Texas MD Anderson Cancer Center and grants from the National Institute of Neurological Diseases and Stroke of the National Institutes of Health (Grants R01 NS073939; R01 NS074999). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

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Robert Dantzer works as a consultant for Ironwood Pharma.

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Dantzer, R., Walker, A.K. Is there a role for glutamate-mediated excitotoxicity in inflammation-induced depression?. J Neural Transm 121, 925–932 (2014). https://doi.org/10.1007/s00702-014-1187-1

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