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A cancer vaccine based on fluorine-modified sialyl-Tn induces robust immune responses in a murine model

Chengcheng Song1,2, Xiu-Jing Zheng1, Chang-Cheng Liu1

  • 1State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China.

Oncotarget
|May 25, 2017
PubMed

Insights

A novel cancer vaccine using fluoro-substituted sialyl-Tn (STn) antigens demonstrated significant antitumor effects in a mouse model. This vaccine enhanced immune responses and prolonged survival, offering a promising strategy for cancer immunotherapy.

Area of Science:

  • Oncology
  • Immunology
  • Vaccine Development

Background:

  • Tumor-associated carbohydrate antigens (TACAs) are promising targets for cancer immunotherapy.
  • Poor immunogenicity of TACAs presents a significant challenge in vaccine development.
  • Modifying carbohydrate antigens can enhance immunogenicity and induce cross-reactivity.

Purpose of the Study:

  • To investigate the antitumor efficacy of fluoro-substituted sialyl-Tn (STn) analogues conjugated to keyhole limpet hemocyanin (KLH).
  • To elucidate the mechanism of tumor immunotherapy induced by these novel vaccine candidates in a murine colon cancer model.

Main Methods:

  • Synthesis and conjugation of three fluoro-substituted STn analogues (2, 3, 4) to KLH.
  • Evaluation of vaccine efficacy in a murine colon cancer model, assessing survival and tumor burden.
  • Analysis of immune responses, including cytotoxic T lymphocytes (CTLs), T helper (Th) cells, and antibody production.

Main Results:

  • Vaccination with 4-KLH, featuring N-fluoroacetyl groups on STn, significantly prolonged survival and reduced lung tumor burden compared to STn-KLH (1-KLH).
  • 4-KLH elicited stronger CTL, Th cell-mediated, and Th1 immune responses, overcoming immune tolerance.
  • 4-KLH induced potent tumor-specific anti-STn antibodies mediating complement-dependent and antibody-dependent cell-mediated cytotoxicity.

Conclusions:

  • Strategic hapten fluorination of STn analogues represents a viable approach for developing effective cancer vaccines.
  • The 4-KLH vaccine demonstrates superior antitumor activity and immune stimulation, highlighting its potential in cancer immunotherapy.
  • Fluorination of carbohydrate antigens may overcome poor immunogenicity and enhance therapeutic responses against various carcinomas.
Keywords:
cancer immunotherapycross reactionfluoro-substituted STnglycoconjugate vaccinetumor-associated carbohydrate antigen

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