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Communication defects with astroglia contribute to early impairments in the motor cortex plasticity of SOD1 mice. | LitMetric

Communication defects with astroglia contribute to early impairments in the motor cortex plasticity of SOD1 mice.

Neurobiol Dis

Instituto de Farmacologia e Neurociências, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisbon, Portugal; Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Lisbon 1649-028, Portugal. Electronic address:

Published: April 2024

AI Article Synopsis

Article Abstract

Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease, involving the selective degeneration of cortical upper synapses in the primary motor cortex (M1). Excitotoxicity in ALS occurs due to an imbalance between excitation and inhibition, closely linked to the loss/gain of astrocytic function. Using the ALS SOD1 mice, we investigated the astrocytic contribution for the electrophysiological alterations observed in the M1 of SOD1 mice, throughout disease progression. Results showed that astrocytes are involved in synaptic dysfunction observed in presymptomatic SOD1 mice, since astrocytic glutamate transport currents are diminished and pharmacological inhibition of astrocytes only impaired long-term potentiation and basal transmission in wild-type mice. Proteomic analysis revealed major differences in neuronal transmission, metabolism, and immune system in upper synapses, confirming early communication deficits between neurons and astroglia. These results provide valuable insights into the early impact of upper synapses in ALS and the lack of supportive functions of cortical astrocytes, highlighting the possibility of manipulating astrocytes to improve synaptic function.

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Source
http://dx.doi.org/10.1016/j.nbd.2024.106435DOI Listing

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