Short synthetic glycopeptides successfully induce antibody responses to carcinoma-associated Tn antigen

Area of Science:

• Immunology
• Glycobiology
• Cancer Research

Background:

• Tumor-associated carbohydrate antigens (Tn antigens) are crucial in cancer biology.
• Developing effective immunotherapies targeting these antigens remains a challenge.

Purpose of the Study:

• To synthesize glycopeptides containing tumor-associated Tn antigens and T-cell epitopes.
• To evaluate the immunogenicity and antigenicity of these synthetic glycopeptides.
• To assess the potential of these glycopeptides in inducing anticancer antibody responses.

Main Methods:

• Synthesis of glycopeptides with mono-, tri-, and hexa-Tn antigens and T-cell epitopes (poliovirus or tetanus toxin).
• Characterization of glycopeptides using a Tn-specific monoclonal antibody (MLS128).
• Immunization of mice with glycopeptides and analysis of antibody responses using ELISA and FACS.

Main Results:

• Tri- and hexa-Tn glycopeptides were recognized by the MLS128 antibody.
• The position and peptide backbone did not affect antigenicity.
• Glycopeptides induced high titers of anti-Tn antibodies in mice without a carrier.
• Generated antibodies recognized native Tn antigens on cancer cells.

Conclusions:

• Short synthetic glycopeptides can act as potent immunogens.
• These glycopeptides can elicit specific antibody responses against tumor-associated Tn antigens.
• Synthetic glycopeptides represent a promising strategy for developing cancer vaccines and immunotherapies.