INOVIO announced the publication of the preclinical study data for IN0-4800, its COVID-19 DNA vaccine, demonstrating robust neutralizing antibody and T cell immune responses against coronavirus SARS-CoV-2.
INO-4800 targets the major surface antigen Spike protein of SARS-CoV-2 virus, which causes COVID-19 disease. The studies demonstrated that vaccination with INO-4800 generated robust binding and neutralizing antibody as well as T cell responses in mice and guinea pigs. Importantly, the authors demonstrated virus neutralizing activity using three separate neutralization assays testing the vaccine’s ability to generate antibodies which can block virus infection by: 1) an assay using live SARS-CoV-2 viruses; 2) an assay using a pseudo-virus assay, where another virus displays the SARS-CoV-2 Spike protein; and, 3) a novel high-throughput surrogate neutralization assay measuring the ability of INO-4800-induced antibodies to block SARS-CoV-2 Spike binding to the host ACE2 receptor.
Study authors also detected these antibodies in the lungs of the vaccinated animals which could be important in providing protection from SARS-CoV-2. In addition, high levels of Spike-specific T cell responses were observed with INO-4800 vaccination, which could be important in mediating protection from the virus infection. Collectively, this preclinical dataset demonstrates that INO-4800 is a promising COVID-19 vaccine candidate against this emerging disease threat.
Dr. J. Joseph Kim, INOVIO’s President & CEO, said,
“INOVIO and our collaborators are working diligently to advance INO-4800 to help fight the current pandemic. We are planning to utilize these positive preclinical results along with our upcoming animal challenge data and safety and immune responses data from our Phase 1 studies to support rapidly advancing this summer to a large, randomized Phase 2/3 clinical trial.”