ImuXen is a patented platform technology based on the concept of simultaneous delivery of multiple active pharmaceutical ingredients (APIs), as antigens with the same liposome. The liposomes are composed of lipids that encapsulate an aqueous core. The APIs can be trapped in the core, be associated with the lipids, or both. Proteins, peptides, nucleic acids, polysaccharides and live or inactivated infectious agents can all be used as an API with the same liposome. Both the size and the lipid composition can be controlled which affects the biological properties of the liposome. Manufacturing involves the passive entrapment of the vaccine APIs by freeze drying commercially available liposomes with the antigens of interest. When the material is rehydrated it yields liposomes with the entrapped APIs.

Having multiple APIs formulated with the same liposome allows simultaneous delivery of the antigens to the same antigen presenting cell. This may allow a more efficient immune response to all the agents presented. In addition, it is possible that multiple vaccines can be delivered with a single injection. Relevant pre-clinical studies have shown a reduction in the number of doses and dosage required, and a faster immune response time. This efficient immune response also may allow for use of antigens that traditionally give a poor antibody response.

This technology is currently being pursued by certain of our collaboration partners.

  • Pharmsynthez has a novel multiple sclerosis vaccine that is in clinical development in Russia.
  • SynBio completed a Phase 1/2 clinical trial to treat relapsing remitting multiple sclerosis (RRMS), and secondary progressive multiple sclerosis (SPMS) in the CIS. Peptides corresponding to antigenic sections of basic myelin protein were encapsulated within liposomes to be used as the therapeutic agent in our drug candidate, Xemys, that uses the ImuXen platform technology. As an integral part of our strategy, we await later stage clinical data on Xemys to determine whether to progress this candidate into U.S. clinical trials for potential out-licensing.