Up-regulation of a chondroitin sulphate epitope during regeneration of mouse sciatic nerve: evidence that the immunoreactive molecules are related to the chondroitin sulphate proteoglycans decorin and versican

The European Journal of Neuroscience
K H BraunewellM Schachner

Abstract

After transection of adult mouse sciatic nerve, the expression of a chondroitin sulphate epitope recognized by the monoclonal antibody 473-HD (mAb 473-HD) was found to be up-regulated. The epitope was localized immunocytochemically mainly in Schwann cell basal laminae and, more weakly, also in the endoneurium. In cultures of mouse dorsal root ganglion cells, Schwann cells expressed high levels but fibroblasts only low levels of the epitope. To identify the molecule(s) carrying this chondroitin sulphate epitope, human sciatic nerves were extracted with phosphate-buffered saline and shown to contain two chondroitin sulphate proteoglycans of apparent molecular weights of 130 and 900 kDa. The 900 kDa and, more weakly, the 130 kDa proteoglycan were reactive with mAb 473-HD, which was found to recognize chondroitin-6-sulphate as epitope. Following chondroitinase ABC treatment of the 130 kDa proteoglycan, a core protein of approximately 45 kDa was seen and shown to react with polyclonal antibodies against the chondroitin-dermatan sulphate proteoglycan decorin from human fibroblasts. Chondroitinase ABC treatment of the 900 kDa proteoglycan yielded a core protein with a molecular weight of approximately 400 kDa that was recognized by po...Continue Reading

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