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.2020 Aug:354:104143.
doi: 10.1016/j.cellimm.2020.104143. Epub 2020 Jun 4.

Intranasal delivery of cationic liposome-protamine complex mRNA vaccine elicits effective anti-tumor immunity

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Intranasal delivery of cationic liposome-protamine complex mRNA vaccine elicits effective anti-tumor immunity

Yaping Mai et al. Cell Immunol.2020 Aug.

Abstract

Immunization with synthetic mRNA encoding tumor-associated antigens is an emerging vaccine strategy for the treatment of cancer. In order to prevent mRNA degradation, promote antigen-presenting cells antigen presentation, and induce an anti-tumor immune response, we investigated the nasal administration of mRNA vaccines with positively charged protamine to concentrate mRNA, form a stable polycation-mRNA complex, and encapsulate the complex with DOTAP/Chol/DSPE-PEG cationic liposomes. Cationic liposome/protamine complex (LPC) showed significantly greater efficiency in uptake of vaccine particles in vitro and stronger capacities to stimulate dendritic cell maturation, which further induced a potent anti-tumor immune response. Intranasal immunization of mice with cationic LPC containing mRNA encoding cytokeratin 19 provoked a strong cellular immune response and slowed tumor growth in an aggressive Lewis lung cancer model. The results of this study provide evidence that cationic LPC can be used as a safe and effective adjuvant and this mRNA formulation provides a basis for anti-cancer vaccination of humans.

Keywords: Cancer; Immunotherapy; Intranasal; Liposome/protamine complex; mRNA Vaccine.

Copyright © 2020 Elsevier Inc. All rights reserved.

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