Monoclonal antibody to human epidermal growth factor

Area of Science:

• Immunology
• Molecular Biology
• Cell Biology

Background:

• Human epidermal growth factor (h-EGF) is a key signaling molecule involved in cell growth and proliferation.
• Developing specific antibodies against growth factors is crucial for understanding their function and for therapeutic applications.

Purpose of the Study:

• To generate and characterize a monoclonal antibody specific to human epidermal growth factor (h-EGF).
• To assess the antibody's ability to block h-EGF binding and its mitogenic activity in human cells.

Main Methods:

• Production of monoclonal antibody 863.D4 via hybridoma technology (murine myeloma cells fused with sensitized BALB/c mouse splenocytes).
• Specificity testing using solid-phase radioimmunoassay (SPRIA) and immunoprecipitation with SDS-PAGE.
• Binding affinity determined by Scatchard analysis.
• Functional assay measuring inhibition of 3H-thymidine incorporation in human foreskin fibroblasts.

Main Results:

• Monoclonal antibody 863.D4 demonstrated high specificity for h-EGF, showing no cross-reactivity with rat or mouse EGF or other polypeptide hormones.
• Scatchard analysis indicated an equilibrium dissociation constant of 1 x 10(-8) M for antibody-h-EGF binding.
• The antibody inhibited both h-EGF binding and h-EGF-stimulated DNA synthesis by over 90% in human foreskin fibroblasts.

Conclusions:

• Monoclonal antibody 863.D4 is a highly specific and potent inhibitor of human epidermal growth factor.
• This antibody serves as a valuable tool for studying h-EGF signaling pathways and its role in cellular processes.