Studies on B- and T-cell receptors for lysozyme

Area of Science:

• Immunology
• Cellular and Molecular Immunology

Background:

• Understanding the specificity of immune cell responses is crucial for vaccine development and immunotherapy.
• Lysozyme serves as a model antigen for studying immune recognition of both native and denatured proteins.

Purpose of the Study:

• To investigate the humoral and cellular immune responses in BALB/c mice following immunization with native or denatured lysozyme.
• To compare the antigen specificity of T cells versus B cells in response to lysozyme.

Main Methods:

• Immunization of BALB/c mice with native or reduced and alkylated lysozyme.
• Humoral response assessment using the Farr assay.
• Cellular response analysis via rosette and plaque assays with modified erythrocytes, and antigen inhibition studies.

Main Results:

• Antibodies and theta-negative (B cells) RFCs demonstrated specificity for the immunizing lysozyme form.
• Theta-positive (T cells) RFCs exhibited broader specificity, recognizing both native and denatured lysozyme with lower avidity.
• Cytophilic antibodies were unlikely to mediate the formation of theta-positive rosettes in this model.

Conclusions:

• T cells possess a wider antigenic specificity for lysozyme compared to B cells.
• Distinct recognition patterns by T and B cells highlight differential antigen processing and presentation pathways.