Immunological determinants of proteoglycans. Antibodies against the unsaturated oligosaccharide products of chondroitinase ABC-digested cartilage proteoglycans.
Bovine nasal cartilage proteoglycan monomer which had been digested with chondroitinase ABC to form the keratan sulfate-protein core was injected into rabbits. High titer antiserum was obtained as judged by the binding of 125I-labeled keratan sulfate-protein core. Native proteoglycan did not inhibit the interaction of the antiserum with labeled keratan sulfate-protein core. However, the disaccharide obtained from chondroitin 4-sulfate by the action of chondroitinase ABC, 2-acetamido-2-deoxy-3-O-(beta-D-gluco-4-enepyranosyluronic acid)-4-O-sulfo-D-galactose, inhibited the interaction 50% at a concentration of 500 microM. The corresponding 6-sulfated and nonsulfated disaccharides at the same concentration gave 15% and 10% inhibition, respectively. Chondroitinase-digested proteoglycan from Swarm rat chondrosarcoma was strongly inhibitory, while the hyaluronidase-digested chondrosarcoma proteoglycan exhibited no detectable inhibition. Evidently, the antiserum raised against chondroitinase ABC-digested bovine nasal cartilage proteoglycan contains antibodies which recognize the unsaturated uronic acid residue linked to N-acetylgalactosamine 4-sulfate. These antibodies will be valuable for identifying and quantitating chondroitin 4-sulfate-containing proteoglycans in tissues.
D000818:Animals; D000906:Antibodies; D002356:Cartilage / Q000032:analysis; D002417:Cattle; D002808:Chondroitin Lyases; D002810:Chondroitinases and Chondroitin Lyases; D000939:Epitopes; D007118:Immunoassay; D009844:Oligosaccharides / Q000276:immunology*; D011509:Proteoglycans / Q000276:immunology*
D000906:Antibodies; D000939:Epitopes; D009844:Oligosaccharides; D011509:Proteoglycans; D002808:Chondroitin Lyases; D002810:Chondroitinases and Chondroitin Lyases