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Exosome-Mediated mRNA Delivery For SARS-CoV-2 Vaccination

Shang-Jui Tsai, Chenxu Guo, Nadia A. Atai, Stephen J. Gould
doi: https://doi.org/10.1101/2020.11.06.371419
Shang-Jui Tsai
*Department of Biological Chemistry, The Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD, 21205
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Chenxu Guo
*Department of Biological Chemistry, The Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD, 21205
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Nadia A. Atai
^Capricor Therapeutics, Inc. 8840 Wilshire Blvd. 2nd Floor, Beverly Hills, CA 90211
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Stephen J. Gould
*Department of Biological Chemistry, The Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD, 21205
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  • For correspondence: sgould@jhmi.edu
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Abstract

Background In less than a year from its zoonotic entry into the human population, SARS-CoV-2 has infected more than 45 million people, caused 1.2 million deaths, and induced widespread societal disruption. Leading SARS-CoV-2 vaccine candidates immunize with the viral spike protein delivered on viral vectors, encoded by injected mRNAs, or as purified protein. Here we describe a different approach to SARS-CoV-2 vaccine development that uses exosomes to deliver mRNAs that encode antigens from multiple SARS-CoV-2 structural proteins.

Approach Exosomes were purified and loaded with mRNAs designed to express (i) an artificial fusion protein, LSNME, that contains portions of the viral spike, nucleocapsid, membrane, and envelope proteins, and (ii) a functional form of spike. The resulting combinatorial vaccine, LSNME/SW1, was injected into thirteen weeks-old, male C57BL/6J mice, followed by interrogation of humoral and cellular immune responses to the SARS-CoV-2 nucleocapsid and spike proteins, as well as hematological and histological analysis to interrogate animals for possible adverse effects.

Results Immunized mice developed CD4+, and CD8+ T-cell reactivities that respond to both the SARS-CoV-2 nucelocapsid protein and the SARS-CoV-2 spike protein. These responses were apparent nearly two months after the conclusion of vaccination, as expected for a durable response to vaccination. In addition, the spike-reactive CD4+ T-cells response was associated with elevated expression of interferon gamma, indicative of a Th1 response, and a lesser induction of interleukin 4, a Th2-associated cytokine. Vaccinated mice showed no sign of altered growth, injection-site hypersensitivity, change in white blood cell profiles, or alterations in organ morphology. Consistent with these results, we also detected moderate but sustained anti-nucleocapsid and anti-spike antibodies in the plasma of vaccinated animals.

Conclusion Taken together, these results validate the use of exosomes for delivering functional mRNAs into target cells in vitro and in vivo, and more specifically, establish that the LSNME/SW1 vaccine induced broad immunity to multiple SARS-CoV-2 proteins.

Competing Interest Statement

S.J.G is a paid consultant for Capricor, holds equity in Capricor, and is co-inventor of intellectual property licensed by Capricor. S.J.T. is co-inventor of intellectual property licensed by Capricor. C.G. is co-inventor of intellectual property licensed by Capricor. N.A. is an employee of Capricor.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted November 06, 2020.
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Exosome-Mediated mRNA Delivery For SARS-CoV-2 Vaccination
Shang-Jui Tsai, Chenxu Guo, Nadia A. Atai, Stephen J. Gould
bioRxiv 2020.11.06.371419; doi: https://doi.org/10.1101/2020.11.06.371419
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Exosome-Mediated mRNA Delivery For SARS-CoV-2 Vaccination
Shang-Jui Tsai, Chenxu Guo, Nadia A. Atai, Stephen J. Gould
bioRxiv 2020.11.06.371419; doi: https://doi.org/10.1101/2020.11.06.371419

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