Vaccines comprising tb10.4

A - Human Necessities – 61 – K

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A61K 39/04 (2006.01) A61K 39/39 (2006.01) A61P 31/06 (2006.01)

Patent

CA 2734714

Vaccination with the combination of Ag85B-TB10 4 and IC31 generated a high amount of polyfunctional CD4+T cells expressing high levels of IFN.gamma., TNF-.alpha., and IL-2 This in turn led to significant protection against infection with M tuberculosis in the mouse aerosol challenge model of tuberculosis. Importantly, our results also showed that both the irnmuno- genicity of the vaccine and its ability to protect against TB infection was highly dependent on the antigen dose. Thus, whereas the standard antigen dose of 5.0µg, as well as 15.0µg, did not induce significant protection against M tuberculosis, reducing the dose to 0.5 µg increased both the immunogenicity of the vaccine as well as its protective efficacy to a level comparable to that observed in BCG vaccinated mice. Thus, the adjuvant IC31®, with the optimal antigen dose, can induce a strong protective Th1 response against M tuberculosis.

L'invention porte sur une vaccination par la combinaison de Ag85B-TB10.4 et IC31 qui a généré une quantité élevée de lymphocytes T CD4+ polyfonctionnels exprimant des taux élevés d'IFN-?, TNF-a et IL-2. Ceci conduit ensuite à une protection significative contre l'infection par M. tuberculosis dans le modèle de stimulation par aérosol de la tuberculose sur souris. Il est important que nos résultats montrent également qu'à la fois l'immunogénicité du vaccin et son aptitude à protéger contre l'infection de tuberculose dépendant fortement de la dose d'antigène. Ainsi, tandis que la dose d'antigène standard de 5,0 µg, de même que celle de 15,0 µg n'induisait pas de protection significative contre M. tuberculosis, la réduction de la dose à 0,5 µg a augmenté à la fois l'immunogénicité du vaccin ainsi que son efficacité protectrice à un taux comparable à celui observé dans des souris vaccinées par le BCG. Ainsi, l'adjuvant IC31®, avec la dose antigène optimale, peut induire une forte réponse de Th1 protectrice contre M. tuberculosis.

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