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Liposome-Encapsulated Human Immunodeficiency Virus-1 gp120 Induces Potent V1V2-Specific Antibodies in Humans.

2018 10 05

Journal Article

Rao, M.; Onkar, S.; Peachman, K.K.; White, Y.; Trinh, H.V.; Jobe, O.; Zhou, Y.; Dawson, P.; Eller, M.A.; Matyas, G.R.; Alving, C.R.

J Infect Dis






Adolescent; Adult; Clinical Trials, Phase I as Topic; Cohort Studies; HIV Antibodies; HIV Envelope Protein gp120; HIV-1; Humans; Liposomes; Middle Aged; Randomized Controlled Trials as Topic; Young Adult

Background: In the RV144 trial, human immunodeficiency virus (HIV)-1 gp120 V1V2 antibodies correlated inversely with risk of HIV-1 infection; however, the titers waned quickly. We hypothesized that a more potent adjuvant might enhance the magnitude and durability of V1V2 antibodies.Methods: We examined archived sera from a phase I randomized, double-blind placebo-controlled trial, conducted in HIV-1-uninfected individuals, vaccinated with HIV-1SF-2 rgp120 either adsorbed to aluminum hydroxide (aluminum hydroxide arm) or encapsulated in liposomes containing monophosphoryl lipid A (MPL®) and then adsorbed to aluminum hydroxide (liposomal arm).Results: The median immunoglobulin G antibody titers across weeks 10-112 were higher in the liposomal arm against subtypes B (2- to 16-fold), AE (4- to 8-fold), and C (4- to 16-fold) V1V2 proteins. High titers were maintained even at 10 months after last boost in the liposomal compared with the aluminum hydroxide arm. The antibodies exhibited antibody-dependent cellular cytotoxicity (ADCC) and α4β7-integrin receptor inhibition-binding functions.Conclusions: Inclusion of 2 adjuvants in the vaccine formulation, aluminum hydroxide, and liposomal MPL®, induced robust, durable, and functional antibodies. Based on the magnitude of antibody responses and the percentage of coiled and β-sheet in the predicted V2/V3-peptide structure, we speculate that liposomal gp120 was presented in a conformation that favored the induction of robust antibody responses.

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