Protein profile of cerebrospinal fluid in multiple sclerosis with special reference to the function of the blood brain barrier.

The leucocyte count, total protein, albumin, IgG, IgA and IgM content of the cerebrospinal fluid (CSF) of 103 multiple sclerosis (MS) patients was determined. In 54 cases a simultaneous analysis of serum was also carried out. As a sign of an intact blood brain barrier the albumin concentration was normal in 76.7%. Taking into account the relative IgG quotient in CSF and serum, and the albumin and IgG concentration gradients between CSF and serum, it was possible to reveal an elevation of IgG content in CSF of MS patients in 75 and 83%, respectively. Without a simultaneous analysis of serum this was the case only in 51.5%. In MS cases with an intact blood brain barrier the values for IgA and/or IgM were slightly elevated in 11.7%. This study demonstrates analytic methods, which support the hypothesis of IgG synthesis by cells accumulating within the CNS in MS. A correlation of the laboratory results and clinical manifestation of MS was tried.