title: Identification of monoclonal antibody At5 as a new member of HNK-1 antibody family: the reactivity with myelin-associated glycoprotein and with two brain-specific proteoglycans, phosphacan and neurocan.
abstract: Monoclonal antibody At5 was primarily developed against chordin, a notochord-specific antigen of Acipenseridae (sturgeon fishes). In higher vertebrates the antibody reacted mainly with neural tissue antigens. In this study we have shown that the specificity of monoclonal antibody At5 is similar to that of antibodies of HNK-1 family which react with two glycolipids and with several high molecular weight glycoconjugates of neural tissue. We have demonstrated by protein sequencing and immunoblotting that one of At5 target antigens of human brain is dMAG, a derivative of myelin-associated glycoprotein. In the preparations of At5 antigens proteoglycans phosphacan and neurocan were identified by immunoblotting with specific monoclonal antibodies 6B4 and 1G2, respectively. The distribution of At5 and 6B4 immunoreactivity was studied on sections of mixed oligoastrocytoma. Oligodendroglioma area of this tumor was intensely stained with both antibodies, whereas astrocytoma area did not exhibit any At5 or 6B4 immunoreactivity.
authors.affiliation: A. N. Bach Institute of Biochemistry of the Russian Academy of Sciences, Moscow.
authors.forename: A A
authors.initials: AA
authors.lastname: Preobrazhensky
authors.forename: A
authors.initials: A
authors.lastname: Oohira
authors.forename: G
authors.initials: G
authors.lastname: Maier
authors.forename: A S
authors.initials: AS
authors.lastname: Voronina
authors.forename: T S
authors.initials: TS
authors.lastname: Vovk
authors.forename: V M
authors.initials: VM
authors.lastname: Barabanov
mesh_terms: D000595:Amino Acid Sequence; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000918:Antibody Specificity; D001254:Astrocytoma / Q000737:chemistry; D001923:Brain Chemistry; D011508:Chondroitin Sulfate Proteoglycans / Q000276:immunology*; D000939:Epitopes / Q000276:immunology; D006023:Glycoproteins / Q000032:analysis / Q000737:chemistry / Q000276:immunology; D006026:Glycoside Hydrolases / Q000378:metabolism; D006801:Humans; D015151:Immunoblotting; D037181:Lectins, C-Type; D008969:Molecular Sequence Data; D018992:Myelin-Associated Glycoprotein / Q000737:chemistry / Q000276:immunology*; D009419:Nerve Tissue Proteins / Q000032:analysis / Q000737:chemistry / Q000276:immunology*; D058580:Neurocan; D010446:Peptide Fragments / Q000737:chemistry; D054633:Receptor-Like Protein Tyrosine Phosphatases, Class 5
chemical_list: D000911:Antibodies, Monoclonal; D011508:Chondroitin Sulfate Proteoglycans; D000939:Epitopes; D006023:Glycoproteins; D037181:Lectins, C-Type; D018992:Myelin-Associated Glycoprotein; D009419:Nerve Tissue Proteins; D058580:Neurocan; D010446:Peptide Fragments; C105801:neurochordin D protein, human; C076817:NCAN protein, human; C516895:PTPRZ1 protein, human; D054633:Receptor-Like Protein Tyrosine Phosphatases, Class 5; D006026:Glycoside Hydrolases