Preparing Live Cells for Immunization.

Area of Science:

• Immunology
• Molecular Biology
• Biochemistry

Background:

• Generating monoclonal antibodies against cell-surface proteins is challenging because purification often alters their native conformation.
• This conformational instability complicates antibody screening and characterization.

Purpose of the Study:

• To describe a method for generating specific monoclonal antibodies against challenging cell-surface proteins.
• To highlight the advantages of using overexpressed, native-like proteins in HEK 293T cells for immunization and screening.

Main Methods:

• Overexpressing target cell-surface proteins in HEK 293T cells.
• Immunizing host animals with these transfected cells to preserve native protein conformation.
• Screening hybridomas using transfected cells and counterscreening on untransfected cells.

Main Results:

• Immunization with native-like expressed proteins ensures correct folding and presentation of conformational epitopes.
• Utilizing transfected cells for screening, alongside counterscreening, enhances specificity.
• This approach facilitates the generation of antibodies against difficult membrane proteins.

Conclusions:

• Immunizing with HEK 293T cells overexpressing target proteins is an effective strategy for generating specific monoclonal antibodies against cell-surface proteins.
• Careful screening and counterscreening are crucial to ensure antibody specificity and avoid off-target binding.