Method of inducing an enhanced immune response against hiv

A - Human Necessities – 61 – K

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A61K 39/21 (2006.01) C07K 14/16 (2006.01) C12N 15/861 (2006.01)

Patent

CA 2478651

An efficient means of inducing an immune response against human immunodeficiency virus (HIV) utilizing specific prime-boost regimes is disclosed. The specific prime-boost regimes employ a heterologous prime-boost protocol employing recombinant adenoviral vectors of alternative and distinct serotypes comprising exogenous genetic material encoding a common HIV antigen. Vaccines administered into living vertebrate tissue in accordance with the disclosed regimes, preferably a mammalian host, such as a human or a non-human mammal of commercial or domestic veterinary importance, express the HIV-1 antigen (e.g., Gag), inducing a cellular immune response which specifically recognizes HIV-1. It is believed that the disclosed prime/boost regime will offer a prophylactic advantage to previously uninfected individuals and/or provide a therapeutic effect by reducing viral load levels within an infected individual, thus prolonging the asymptomatic phase of HIV-1 infection.

L'invention concerne un procédé efficace visant à induire une réponse immunitaire contre le VIH, qui repose sur l'utilisation de régimes spécifiques de primo-immunisation/rappel. Ces régimes font appel à un protocole de primo-immunisation/rappel hétérologue à vecteurs adénoviraux de recombinaison constitués de sérotypes alternes et distincts qui comprennent du matériel génétique exogène codant un antigène commun du VIH. Les vaccins administrés dans du tissu de vertébré vivant selon les régimes considérés, de préférence chez un hôte mammalien (par exemple, mammifère humain ou mammifère non humain ayant une importance vétérinaire du point de vue commercial ou domestique), expriment l'antigène du VIH-1 (par exemple, Gag), induisant une réponse immunitaire cellulaire qui reconnaît spécifiquement le VIH-1. On pense que le type de régime de primo-immunisation/rappel décrit présente un avantage prophylactique pour des individus précédemment non infectés et/ou produit un effet thérapeutique en réduisant les niveaux de charge virale chez un individu infecté, prolongeant ainsi la phase asymptomatique de l'infection par le VIH-1.

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