Journal Article

DZNE-2024-01146

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Bidirectional dysregulation of synaptic glutamate signaling after transient metabolic failure.

Passlick, S. ; Ullah, G. ; Henneberger, C. (Last author)DZNE*

2024
eLife Sciences Publications Cambridge

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Please use a persistent id in citations: doi:10.7554/eLife.98834

Abstract: Ischemia leads to a severe dysregulation of glutamate homeostasis and excitotoxic cell damage in the brain. Shorter episodes of energy depletion, for instance during peri-infarct depolarizations, can also acutely perturb glutamate signaling. It is less clear if such episodes of metabolic failure also have persistent effects on glutamate signaling and how the relevant mechanisms such as glutamate release and uptake are differentially affected. We modeled acute and transient metabolic failure by using a chemical ischemia protocol and analyzed its effect on glutamatergic synaptic transmission and extracellular glutamate signals by electrophysiology and multiphoton imaging, respectively, in the mouse hippocampus. Our experiments uncover a duration-dependent bidirectional dysregulation of glutamate signaling. Whereas short chemical ischemia induces a lasting potentiation of presynaptic glutamate release and synaptic transmission, longer episodes result in a persistent postsynaptic failure of synaptic transmission. We also observed unexpected differences in the vulnerability of the investigated cellular mechanisms. Axonal action potential firing and glutamate uptake were surprisingly resilient compared to postsynaptic cells, which overall were most vulnerable to acute and transient metabolic stress. We conclude that short perturbations of energy supply lead to a lasting potentiation of synaptic glutamate release, which may increase glutamate excitotoxicity well beyond the metabolic incident.

Keyword(s): Animals (MeSH) ; Glutamic Acid: metabolism (MeSH) ; Mice (MeSH) ; Synaptic Transmission (MeSH) ; Hippocampus: metabolism (MeSH) ; Signal Transduction (MeSH) ; Male (MeSH) ; Synapses: metabolism (MeSH) ; Synapses: physiology (MeSH) ; Mice, Inbred C57BL (MeSH) ; glutamate release ; glutamate uptake ; ischemia ; metabolic failure ; mouse ; neuroscience ; stroke ; synaptic transmission ; Glutamic Acid

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Contributing Institute(s):

1. Synaptic and Glial Plasticity (AG Henneberger)

Research Program(s):

1. 351 - Brain Function (POF4-351) (POF4-351)

Appears in the scientific report 2024

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