Molecular characterization of a monoclonal murine anti-blood group A antibody

• Published in: Immunology letters Vol. 76; no. 1; pp. 15 - 23
• Main Authors: Lévy, Martine, Edelman, Léna, Dighiero, Guillaume
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.02.2001
• Subjects: ABO Blood-Group System - immunology; Amino Acid Sequence; Animals; Anti-blood group A monoclonal antibody; Anti-carbohydrates antibodies; Antibodies, Monoclonal - biosynthesis; Antibodies, Monoclonal - chemistry; Antibodies, Monoclonal - genetics; Antibody Specificity; Autoimmunity; Base Sequence; Humans; Immunoglobulin Heavy Chains - biosynthesis; Immunoglobulin Heavy Chains - chemistry; Immunoglobulin Heavy Chains - genetics; Immunoglobulin Light Chains - biosynthesis; Immunoglobulin Light Chains - chemistry; Immunoglobulin Light Chains - genetics; Immunoglobulin Variable Region - biosynthesis; Immunoglobulin Variable Region - chemistry; Immunoglobulin Variable Region - genetics; Mice; Mice, Inbred BALB C; Molecular Sequence Data; Tolerance; Autoimmunity; Igs, immunoglobulins; Anti-carbohydrates antibodies; Tolerance; RBC, red blood cells; Anti-blood group A monoclonal antibody; CA, cold agglutinins
• ISSN: 0165-2478; 1879-0542
• DOI: 10.1016/S0165-2478(00)00312-6

A mouse monoclonal anti-human blood group A antigen (AC12, μ, κ) has been generated and sequenced in order to analyze the immunoglobulin genes used to generate antibodies with anti-human blood group A specificity. Mice were immunized with human type A RBC. Anti-A producing hybridomas were detected by agglutination against human type A RBC. Total cellular RNA was extracted from hybridomas cells. PCR amplification and sequencing of anti-A heavy and light chain cDNAs were performed. The VH and VK sequences of antibody AC12 were shown to be very homologous to that used by other antibodies recognizing carbohydrates as well as glycoproteins, peptides or haptens constituting self antigens as well as nonself antigens. The VH sequence of antibody AC12 presented important homology with a previously reported monoclonal anti-blood group B antibody. The antibody AC12 also presented homology with the VH and VK sequences of a previously reported human anti-blood group A antibody which contributes additional evidence in favor of a restricted usage of V segments by antibodies directed against red blood antigens.