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Motor unit hyperexcitability in amyotrophic lateral sclerosis vs amino acids acting as neurotransmitters
Author(s) -
KosteraPruszczyk A.,
NiebrojDobosz I.,
EmerykSzajewska B.,
Karwańska A.,
RowińskaMarcińska K.
Publication year - 2002
Publication title -
acta neurologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.967
H-Index - 95
eISSN - 1600-0404
pISSN - 0001-6314
DOI - 10.1034/j.1600-0404.2002.00149.x
Subject(s) - amyotrophic lateral sclerosis , electrophysiology , glutamate receptor , motor neuron , neuroscience , cerebrospinal fluid , inhibitory postsynaptic potential , excitatory postsynaptic potential , glycine , amino acid , upper motor neuron , medicine , excitatory amino acid transporter , chemistry , motor unit , anesthesia , biology , spinal cord , biochemistry , disease , receptor
Objectives – Electrophysiological studies of amyotrophic lateral sclerosis (ALS) patients reveal not only lower motor neuron involvement, but also widespread signs of its hyperexcitability. They might be the consequence of changes in the level of amino acids acting as neurotransmitters. Material and methods – Electrophysiological examination of 31 patients with sporadic ALS was performed. A hyperexcitability index (HI) was created to describe the amount of double discharges, fasciculation potentials or `giant' F‐waves. Glutamate, aspartate, glycine and GABA concentration in serum and cerebrospinal fluid (CSF) were estimated, using the high performance liquid chromatography technique. Results – The electrophysiological studies revealed marked variability in HI in the patients group. HI did not correlate with duration of the disease and the degree of disability expressed with Norris score, as well as with the level of excitatory or inhibitory amino acids in the body fluids. Conclusion – Hyperexcitability of the motor unit observed in ALS is not directly related to changes in serum and CSF level of amino acids acting as neurotransmitters.