P-C11 Adjuvant-dependent innate and adaptive immunesignatures of risk of SIVmac251 acquisition

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Abstract

A recombinant vaccine containing Aventis Pasteur’s canarypox vector (ALVAC)-HIV and gp120 alum decreased the risk of HIV acquisition in the RV144 vaccine trial. The substitution of alum with the more immunogenic MF59 adjuvant is under consideration for the next efficacy human trial. We found here that an ALVAC-simian immunodeficiency virus (SIV) and gp120 alum (ALVAC-SIV + gp120) equivalent vaccine, but not an ALVAC-SIV + gp120 MF59 vaccine, was efficacious in delaying the onset of SIVmac251 in rhesus macaques, despite the higher immunogenicity of the latter adjuvant. Vaccine efficacy was associated with alum-induced, but not with MF59-induced, envelope (Env)-dependent mucosal innate lymphoid cells (ILCs) that produce interleukin (IL)-17, as well as with mucosal lgG to the gp120 variable region 2 (V2) and the expression of 12 genes, 10 of which are part of the RAS pathway. The association between RAS activation and vaccine efficacy was also observed in an independent efficacious SIV-vaccine approach. We tested adjuvants that may be able to increase the “protective profile” and found one adjuvant that significantly decreased the frequency of a4B7 Ki67+CD4+ T-cell targets of viral infection. Results of challenge exposure experiment will be presented.

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