Gamma-aminobutyric acid (GABA) promotes recovery from spinal cord injury in lampreys: role of GABA r

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In mammals, spinal cord injury (SCI) is a devastating event that can lead to a permanent loss of motor, sensory and autonomic functions below the site of injury. In the last years, the role of different neurotransmitter systems on re-generation and recovery from SCI has been deciphered. For example, studies in lampreys have shown that neurotransmitters play a key role in modulating the survival and regeneration of brainstem descending neurons after SCI (Ro-maus-Sanjurjo et al., 2018; Sobrido-Cameán et al., 2018). Glutamate is known to play a prominent role after SCI since it causes excitotoxicity to non-injured neurons during the secondary phase after a traumatic injury both in mam-mals and lampreys (Fández-López et al., 2014). In contrast, recent work in lampreys has shown that γ-aminobutyric acid (GABA) can play a neuro-protective and pro-regenerative role after SCI (Romaus-Sanjurjo et al., 2018). GABA is the main inhibitory neurotransmitter in the central nervous system (CNS) of vertebrates, and acts through both metabotropic G-protein-coupled GABAB receptors, and ionotropic ligand-gated chloride channel GABAA re-ceptors. Here, we discuss recent work from our group and others on the pos-sible role of different GABA receptors in neuronal survival and regeneration after SCI and provide a perspective on future work in this field.
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