A method to generate antigen-specific mAb capable of staining formalin-fixed, paraffin-embedded tissue sections

Area of Science:

• Immunology
• Molecular Biology
• Oncology

Background:

• Abnormalities in HLA class I antigen expression are common in malignant tumors.
• Understanding these abnormalities is crucial for T cell-based immunotherapy outcomes.
• Antigen processing machinery (APM) component expression is one known mechanism, but limited research exists due to lack of suitable antibodies.

Purpose of the Study:

• To develop a method for generating monoclonal antibodies (mAbs) specific to APM components.
• To enable immunohistochemical (IHC) staining of formalin-fixed, paraffin-embedded tissues for APM components.

Main Methods:

• Synthesized peptides from APM components with low homology to mouse counterparts.
• Immunized mice with peptides and purified recombinant proteins.
• Generated hybridomas and screened for APM-specific antibody production using Western blotting.
• Characterized antibody specificity and reactivity via ELISA and flow cytometry.
• Tested antibody performance in IHC on formalin-fixed, paraffin-embedded tissues.

Main Results:

• Successfully generated a panel of APM component-specific mAbs.
• These mAbs effectively stain formalin-fixed, paraffin-embedded tissues in IHC reactions.
• The developed methodology is reproducible and straightforward.

Conclusions:

• The new method provides essential reagents for analyzing APM component expression in physiological and pathological tissues.
• This facilitates further research into HLA class I abnormalities and their role in cancer and immunotherapy.
• The methodology is adaptable for developing mAbs against other protein targets in fixed tissues.