Abstract
Complement-fixing (CF) antibrain antibodies are frequently found in serum and CSF in multiple sclerosis (MS). They represent several specificities and appear to be synthesized on both sides of the blood-brain barrier. Five sera and six CSF samples from 11 MS patients, representing 6 different specificities of antibodies, were absorbed with a series of bacterial strains with affinity for various immunoglobulins. Reactivity with brain preparations was eliminated by absorption with the following IgG absorbents: Staphylococcus aureus strain Cowan I, group A streptococcus strain A R1, and group G streptococcus strain G 148, but not by absorption with strains with low or no affinity for IgG. The results indicate in all tested samples the IgG1 and/or IgG2 nature of the antibrain antibodies.
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