The Glycopeptide PV-PS A1 Immunogen Elicits Both CD4+ and CD8+ Responses

Overview

Journal Vaccines (Basel)

Date 2025 Jan 8

PMID 39772036

Authors

Sharmeen Nishat

Md Kamal Hossain

Geraud Valentin

Farzana Hossain

Shanika Gamage

Katherine A Wall

Peter R Andreana

Affiliations

Soon will be listed here.

Abstract

Background/objectives: The MHCII-dependent, CD4+ T-cell zwitterionic polysaccharide PS A1 has been investigated as a promising carrier for vaccine development because it can induce an MHCII-dependent CD4+ response towards a variety of tumor-associated carbohydrate antigens (TACAs). However, PS A1 cannot elicit cytotoxic T lymphocytes through MHCI, which may or may not hamper its potential clinical use in cancer, infectious and viral vaccine development. This paper addresses PS A1 MHCI independence through the introduction of an MHCI epitope, the poliovirus (PV) peptide, to establish an MHCI- and MHCII-dependent vaccine.

Methods: We synthesized a glycopeptide construct targeting the Thomsen-nouveau TACA (Tn-PV-PS A1) and a control Tn-PV peptide. C57BL/6 mice were immunized with both constructs, and the resulting T-cells were extracted from spleens.

Results: Through cell proliferation assays, we show that Tn-PV-PS A1 elicits a robust CD4+ and CD8+ immune response. The resulting cytotoxic T lymphocytes are specific towards Tn-PV and trigger cell lysis of Tn-expressing EL4 cells.

Conclusions: This study confirms PV-PS A1 as a robust MHCI- and MHCII-dependent carrier. This is the first report of MHCI dependence in a zwitterionic polysaccharide.

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