Abstract
Elevated cerebrospinal fluid (CSF)/serum quotients of albumin (QAlb) may occur in motor neuron diseases (MND) including amyotrophic lateral sclerosis (ALS), but the pathophysiologic mechanisms underlying these alterations are unclear. Evidence from animal experiments suggests that the arterial carbon dioxide level might affect the QAlb, i.e. the function of the blood-CSF barrier (BCB). We therefore compared basic CSF parameters in different forms of MND (ALS, n = 105; lower motor neuron diseases, n = 12; and upper motor neuron diseases, n = 7) and investigated the relationship between elevated QAlb and the arterial partial pressure of carbon dioxide (pCO2) in ALS where respiratory insufficiency leads to hypercapnia in the course of the disease. Pathologic elevations of QAlb occurred in 32 of 124 MND patients. In ALS, QAlb significantly correlated with the arterial pCO2 (r = 0.454; P = 0.001; n = 45). These data indicate that BCB dysfunction is a frequent finding in different forms of MND and may reflect distinct pathophysiological mechanisms. In ALS, an important underlying mechanism might be the influence of the arterial pCO2 which may alter the CSF flow.
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We thank Refika Aksamija, Vera Lehmensiek, Christa Ondratscheck, and Dagmar Vogel for skillful laboratory work.
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Süssmuth, S.D., Sperfeld, A.D., Ludolph, A.C. et al. Hypercapnia is a Possible Determinant of the Function of the Blood-Cerebrospinal Fluid Barrier in Amyotrophic Lateral Sclerosis. Neurochem Res 35, 1071–1074 (2010). https://doi.org/10.1007/s11064-010-0156-9
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DOI: https://doi.org/10.1007/s11064-010-0156-9