Human monoclonal antibodies to Rh0(D)

Area of Science:

• Immunology
• Hematology
• Biotechnology

Background:

• The RhD antigen is crucial for blood transfusion compatibility and preventing hemolytic disease of the newborn.
• Existing methods for RhD typing can be limited, necessitating improved diagnostic tools.

Purpose of the Study:

• To generate human monoclonal antibodies targeting the RhD antigen.
• To characterize the reactivity of these antibodies for diagnostic applications.
• To explore their potential in preventing Rh hemolytic disease.

Main Methods:

• Isolation of B lymphocytes from Rh-negative donors with anti-D antibodies.
• Fusion with mouse-human heteromyeloma (SBC-H20) to create hybridomas.
• Production and characterization of IgM and IgG1 human monoclonal antibodies against the D antigen.

Main Results:

• Both IgM and IgG1 antibodies effectively agglutinated D-positive red blood cells.
• IgM antibodies showed immediate reactivity, while IgG1 antibodies reacted via indirect hemagglutination.
• Distinct epitope recognition was observed between the IgM and IgG1 antibodies.
• Antibody-coated cells demonstrated inhibition, suggesting closely associated epitopes.

Conclusions:

• Human monoclonal antibodies against the D antigen were successfully produced.
• These antibodies serve as valuable diagnostic reagents for RhD blood typing.
• Potential therapeutic applications in preventing Rh hemolytic disease of the newborn are indicated.