title: Cell-substratum adhesion in embryonic chick central nervous system is mediated by a 170,000-mol-wt neural-specific polypeptide.
abstract: Embryonal chick neural retina cells release into the culture medium a complex of proteins and glycosaminoglycans, termed adherons, that promote cell to substratum adhesion. A monoclonal antibody (C1H3) blocks adheron-mediated cell to substratum adhesion and specifically binds to a 170,000-mol-wt protein present in retinal adherons (Cole, G.J., and L. Glaser, 1984, J. Biol. Chem., 259:4031-4034). The 170,000-mol-wt protein also can be identified in embryonic chick brain and peripheral nervous tissue. In the neural retina, C1H3 also binds to a second antigen with a molecular weight of 140,000 that is absent in the brain. Embryonic brain, therefore, provides a source for the immunopurification of the 170,000-mol-wt protein. Brain adherons also contain the 170,000-mol-wt protein, and cell to substratum adhesion mediated by these adherons is blocked by the C1H3 monoclonal antibody. The 170,000-mol-wt protein in the brain is therefore functionally identical to that in the retina. To demonstrate that adheron-mediated cell to substratum adhesion is caused by cell binding to the 170,000-mol-wt protein, we showed that (a) protease digestion, but not glycosaminoglycan hydrolase digestion of adherons, blocked their ability to bind cells to substratum; (b) the immunopurified 170,000-mol-wt protein blocks adheron-mediated cell to substratum adhesion; and (c) cells can bind to immunopurified 170,000-mol-wt protein bound to glass surfaces.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D000941:Antigens / Q000276:immunology; D001921:Brain / Q000196:embryology / Q000378:metabolism*; D002448:Cell Adhesion / Q000187:drug effects; D002642:Chick Embryo; D006025:Glycosaminoglycans / Q000378:metabolism; D051379:Mice; D008970:Molecular Weight; D009419:Nerve Tissue Proteins / Q000276:immunology / Q000302:isolation & purification / Q000502:physiology*; D010447:Peptide Hydrolases / Q000494:pharmacology; D051381:Rats; D012160:Retina / Q000196:embryology / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D000941:Antigens; D006025:Glycosaminoglycans; D009419:Nerve Tissue Proteins; D010447:Peptide Hydrolases