1 June 2020 - - US-based Codiak BioSciences, Inc., a company specialised engineered exosomes as a new class of biologic medicines, has entered into two strategic collaborations with the Ragon Institute of MGH, MIT and Harvard to investigate the potential of its exoVACC vaccine platform in (1) SARS-CoV-2, the virus that causes COVID-19, and in (2) human immunodeficiency virus, the company said.

As part of the sponsored collaboration research agreements, Codiak researchers will work with Bruce Walker, M.D., and Gaurav Gaiha, M.D., D.Phil., of the Ragon Institute to build integrated exosome-based vaccines aimed at inducing broad neutralizing antibody and antigen-specific T cell protection against the viruses.

exoVACC is Codiak's proprietary and modular vaccine system that utilizes the unique properties of exosomes to deliver antigens and adjuvants simultaneously and selectively to the same antigen presenting cells, driving an integrated innate, cellular and antibody-mediated immune response.

Utilising its engEx engineering platform, Codiak can incorporate within a single exosome multiple complex antigens and adjuvants, as well as cell-targeting ligands and immune co-stimulatory molecules to potentially enhance and shape an immune response.

For SARS-CoV-2, Codiak will collaborate with the lab of Dr. Gaurav Gaiha, Associate Member at the Ragon Institute and Instructor of Medicine at Harvard Medical School, to evaluate the ability of exoVACC to induce neutralizing antibody and antigen-specific T cell responses in the lung and other mucosal surfaces where SARS-CoV-2 may initiate infections.

The Walker/Gaiha lab will provide Codiak SARS-CoV-2 antigens identified using the Ragon Institute's innovative computational methods that integrate network theory and structure information to predict highly conserved, structurally constrained T cell epitopes for use in antigen-specific vaccines.

Codiak will generate combinatorial exoVACC candidates directed against these T cell epitopes and validated B cell epitopes, which the Gaiha lab will then evaluate for specificity and potency.

If successful, the exoVACC candidates would be ready for efficacy assessments in animal models of viral infection. This work is being funded in part by an Evergrande COVID-19 Response Fund Award, which was granted to Codiak and the Ragon Institute by the Massachusetts Consortium on Pathogen Readiness.

For HIV, Codiak will collaborate with the labs of both Drs. Gaiha and Bruce Walker, founding director of the Ragon Institute of MGH, MIT and Harvard and the director of the Harvard University Center for AIDS Research.

The Gaiha and Walker labs will provide Codiak HIV antigens identified again using the Ragon Institute's innovative computational methods. Codiak will generate exoVACC candidates directed against one or multiple T cell epitopes, which the Gaiha and Walker labs will then evaluate for potency.

After the initial phase of work is completed, Codiak has an option to negotiate exclusive licenses for technology developed under both collaborations.

The engEx Platform is Codiak's proprietary exosome therapeutic engine for engineering and manufacturing novel exosome product candidates designed to target multiple pathways throughout the body.

Using this platform, Codiak can design exosomes with precisely engineered properties, incorporate various types of biologically active molecules and direct them to specific cell types and tissues.

These exosomes engage targets by cellular uptake, membrane-to-membrane interaction or a combination of both mechanisms and are designed to change the biological functioning of the recipient cells in order to produce the intended biological effect.