Biomaterial Database

Affinity studies of human anti-MAG antibodies in neuropathy. 1994

M Ogino, and A H Tatum, and N Latov

Department of Neurology, Columbia Presbyterian Medical Center, College of Physicians and Surgeons, Columbia University, New York, NY 10032.

Human IgM anti-myelin associated glycoprotein (MAG) antibodies from patients with neuropathy bind to oligosaccharide determinants shared by MAG and several other glycoconjugates in peripheral nerve. The apparent affinities of human anti-MAG antibodies were determined by an ELISA system which measures free antibody concentration at equilibrium in solution. Intact MAG, which bears multiple antigenic oligosaccharides, and monovalent oligosaccharides generated by pronase digestion of MAG were used as antigen. The human antibodies bound to intact MAG with dissociation constants of between 2.5 x 10(-10) M and 2.1 x 10(-7) M, and to the monovalent oligosaccharides with up to 100-fold lower affinities. Reduction of the pentameric IgM to its monomeric counterpart reduced its affinity to intact MAG 5-fold, but its avidity for immobilized MAG was reduced 500-fold as determined by ELISA. These studies show that IgM Anti-MAG antibodies exhibit relatively low intrinsic affinities for the oligosaccharide antigen, but their affinities and avidities are significantly increased by the multivalent nature of the antibody-antigen interaction.

UI	MeSH Term	Description	Entries
D009185	Myelin Proteins	MYELIN-specific proteins that play a structural or regulatory role in the genesis and maintenance of the lamellar MYELIN SHEATH structure.	Myelin Protein,Protein, Myelin,Proteins, Myelin
D009422	Nervous System Diseases	Diseases of the central and peripheral nervous system. This includes disorders of the brain, spinal cord, cranial nerves, peripheral nerves, nerve roots, autonomic nervous system, neuromuscular junction, and muscle.	Neurologic Disorders,Nervous System Disorders,Neurological Disorders,Disease, Nervous System,Diseases, Nervous System,Disorder, Nervous System,Disorder, Neurologic,Disorder, Neurological,Disorders, Nervous System,Disorders, Neurologic,Disorders, Neurological,Nervous System Disease,Nervous System Disorder,Neurologic Disorder,Neurological Disorder
D004797	Enzyme-Linked Immunosorbent Assay	An immunoassay utilizing an antibody labeled with an enzyme marker such as horseradish peroxidase. While either the enzyme or the antibody is bound to an immunosorbent substrate, they both retain their biologic activity; the change in enzyme activity as a result of the enzyme-antibody-antigen reaction is proportional to the concentration of the antigen and can be measured spectrophotometrically or with the naked eye. Many variations of the method have been developed.	ELISA,Assay, Enzyme-Linked Immunosorbent,Assays, Enzyme-Linked Immunosorbent,Enzyme Linked Immunosorbent Assay,Enzyme-Linked Immunosorbent Assays,Immunosorbent Assay, Enzyme-Linked,Immunosorbent Assays, Enzyme-Linked
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D000911	Antibodies, Monoclonal	Antibodies produced by a single clone of cells.	Monoclonal Antibodies,Monoclonal Antibody,Antibody, Monoclonal
D000915	Antibody Affinity	A measure of the binding strength between antibody and a simple hapten or antigen determinant. It depends on the closeness of stereochemical fit between antibody combining sites and antigen determinants, on the size of the area of contact between them, and on the distribution of charged and hydrophobic groups. It includes the concept of "avidity," which refers to the strength of the antigen-antibody bond after formation of reversible complexes.	Affinity, Antibody,Antibody Avidity,Avidity, Antibody,Affinities, Antibody,Antibody Affinities,Antibody Avidities,Avidities, Antibody
D000937	Antigen-Antibody Reactions	The processes triggered by interactions of ANTIBODIES with their ANTIGENS.	Antigen Antibody Reactions,Antigen-Antibody Reaction,Reaction, Antigen-Antibody,Reactions, Antigen-Antibody
D051379	Mice	The common name for the genus Mus.	Mice, House,Mus,Mus musculus,Mice, Laboratory,Mouse,Mouse, House,Mouse, Laboratory,Mouse, Swiss,Mus domesticus,Mus musculus domesticus,Swiss Mice,House Mice,House Mouse,Laboratory Mice,Laboratory Mouse,Mice, Swiss,Swiss Mouse,domesticus, Mus musculus
D018992	Myelin-Associated Glycoprotein	A myelin protein found in the periaxonal membrane of both the central and peripheral nervous systems myelin sheaths. It binds to cells surface receptors found on AXONS and may regulate cellular interactions between MYELIN and AXONS.	Large Myelin-Associated Glycoprotein Isoform,Sialic Acid Binding Ig-Like Lectin 4A,Sialic Acid Binding Ig-like Lectin 4,Siglec-4,Small Myelin-Associated Glycoprotein Isoform,Large Myelin Associated Glycoprotein Isoform,Myelin Associated Glycoprotein,Sialic Acid Binding Ig Like Lectin 4A,Sialic Acid Binding Ig like Lectin 4,Siglec 4,Small Myelin Associated Glycoprotein Isoform