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Rabbit antibodies raised against microtubule-associated protein 1 (MAP-1) from hog brain were found to crossreact with extracellular matrix components of mouse BALB/c 3T3 cell cultures. As shown by immunofluorescence microscopy of confluent cell cultures, the extracellular MAP-related antigen was located on dense fibrillar network arrays underlying and surrounding the cells. The immunoreactive material was sensitive to trypsin but resistant to collagenase. The microtubule-disrupting drug colcemid had no visible effect on the morphology of the anti-MAP-stained network, whereas treatment with cytochalasin B provoked its abolishment. Simian virus 40-transformed BALB/c 3T3 cells expressed considerably less extracellular antigen than did the nontransformed cells. After in vivo radiolabeling of BALB/c 3T3 cells, a secreted polypeptide of Mr 205,000 was isolated by immuno-precipitation from culture media as well as from cell-free extracellular matrices. This antigen was identified as a sulfoglycoprotein, noncollageneous in nature, that undergoes intermolecular disulfide bonding. Anti-MAP-1 antibodies affinity-purified on the extracellular Mr 205,000 protein were immunoreactive with MAP-1 and MAP-2 from brain and decorated cytoplasmic microtubules as demonstrated by immunoblotting and immunofluorescence microscopy. Thus, a structural relationship between cytoskeletal and extracellular polypeptides is demonstrated.

proceedings of the national academy of sciences of the united states of america

Mr 205,000 sulfoglycoprotein in extracellular matrix of mouse fibroblast cells is immunologically related to high molecular weight microtubule-associated proteins.