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Differential effects on KCC2 expression and spasticity of ALS and traumatic injuries to motoneurons
Mòdol, Laura (Universitat Autònoma de Barcelona. Institut de Neurociències)
Mancuso, Renzo (Universitat Autònoma de Barcelona. Institut de Neurociències)
Alé, Albert (Universitat Autònoma de Barcelona. Institut de Neurociències)
Francos Quijorna, Isaac (Universitat Autònoma de Barcelona. Institut de Neurociències)
Navarro, X. (Xavier) (Universitat Autònoma de Barcelona. Institut de Neurociències)

Data: 2014
Resum: Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease manifested by progressive muscle atrophy and paralysis due to the loss of upper and lower motoneurons (MN). Spasticity appears in ALS patients leading to further disabling consequences. Loss of the inhibitory tone induced by downregulation of the potassium chloride cotransporter 2 (KCC2) in MN has been proposed to importantly contribute to the spastic behavior after spinal cord injury (SCI). The aim of the present study was to test whether the alterations in the expression of KCC2 are linked to the appearance of spasticity in the SOD(G93A) ALS murine model. We compared SOD(G93A) mice to wild type mice subjected to SCI to mimic the spinal MN disconnection from motor descending pathways, and to sciatic nerve lesion to mimic the loss of MN connectivity to muscle. Electrophysiological results show that loss of motor function is observed at presymptomatic stage (8 weeks) in SOD(G93A) mice but hyperreflexia and spasticity do not appear until a late stage (16 weeks). However, KCC2 was not downregulated despite MN suffered disconnection both from muscles and upper MNs. Further experiments revealed decreased gephyrin expression, as a general marker of inhibitory systems, accompanied by a reduction in the number of Renshaw interneurons. Moreover, 5-HT fibers were increased in the ventral horn of the lumbar spinal cord at late stage of disease progression in SOD1(G93A) mice. Taken together, the present results indicate that spasticity appears late in the ALS model, and may be mediated by a decrease in inhibitory interneurons and an increase of 5-HT transmission, while the absence of down-regulation of KCC2 could rather indicate an inability of MNs to respond to insults.
Drets: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. Creative Commons
Llengua: Anglès
Document: article ; recerca ; publishedVersion
Matèria: Músculs -- Malalties ; KCC2 transporter ; Hypereflexia ; Motoneuron ; Spasticity ; Transportador KCC2 ; Hiperreflèxia ; Neurones motores ; Espasticitat
Publicat a: Frontiers in cellular neuroscience, Vol. 8 Núm. 7 (Jan. 2014) , p. 1-11, ISSN 1662-5102

DOI: 10.3389/fncel.2014.00007

11 p, 3.3 MB

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Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències de la salut i biociències > Institut de Neurociències (INc)
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 Registre creat el 2014-08-29, darrera modificació el 2016-10-04

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