Abstract
Antibodies were prepared to mammalian CNS neurofilament proteins (NFPs) and the antibody specificities were compared using a sensitive immunoblotting method. This procedure was used to detect and characterize cross-reactive proteins and their degradation products in neurofilament preparations. NFPs were prepared by axon flotation. Rabbits were immunized with 200,000, 140,000, and 70,000 NFPs (200K, 140K, and 70K) that had been electrophoretically purified by polyacrylamide gel electrophoresis (PAGE). By immunohistofluorescence it was shown that all antisera stained similar filamentous structures in rat cerebellar neurons. By use of a horseradish peroxidase-conjugated indirect antibody procedure, however, differences were detected in the cross-reactivities of the antisera to rat NFPs, separated by PAGE and electrophoretically transferred to nitrocellulose membranes. Each antiserum exhibited strong binding to the homologous NFP and, thus, was suitable for the detection of cross-reactive polypeptides and proteolytic degradation products derived exclusively from the individual NFPs. Anti-200K, anti-140K, or anti-70K was applied to overloaded two-dimensional nitrocellulose blots of NFPs prepared by axon flotation. Each of the three ...Continue Reading
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