Abstract
The development of a protective vaccine remains a top priority for the control of the HIV/AIDS pandemic. Here, we show that a messenger RNA (mRNA) vaccine co-expressing membrane-anchored HIV-1 envelope (Env) and simian immunodeficiency virus (SIV) Gag proteins to generate virus-like particles (VLPs) induces antibodies capable of broad neutralization and reduces the risk of infection in rhesus macaques. In mice, immunization with co-formulated env and gag mRNAs was superior to env mRNA alone in inducing neutralizing antibodies. Macaques were primed with a transmitted-founder clade-B env mRNA lacking the N276 glycan, followed by multiple booster immunizations with glycan-repaired autologous and subsequently bivalent heterologous envs (clades A and C). This regimen was highly immunogenic and elicited neutralizing antibodies against the most prevalent (tier-2) HIV-1 strains accompanied by robust anti-Env CD4+ T cell responses. Vaccinated animals had a 79% per-exposure risk reduction upon repeated low-dose mucosal challenges with heterologous tier-2 simian–human immunodeficiency virus (SHIV AD8). Thus, the multiclade env–gag VLP mRNA platform represents a promising approach for the development of an HIV-1 vaccine.
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Data availability
The GenBank accession codes for the mRNA sequences are MZ362872, MZ362873, MZ362874, MZ362875 and MZ362876.
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Acknowledgements
The authors thank the animal care personnel at Bioqual Inc. and at the Poolesville NIH Animal Facility. The authors also thank J. Moore (Weill-Cornell Medicine, New York) for the BG505 SOSIP.664 plasmid, J. Van Schooten (University of Amsterdam, The Netherlands) for plasmids to produce monoclonal antibodies RM20A3, RM20C, RM20E1, RM20F, RM20G, RM20J, RM15E and RM54B1, and the National Institutes of Health (NIH) AIDS Reagent Program for the reagents listed in the Methods section. This study was supported by the Intramural Research Program of the Division of Intramural Research and the Vaccine Research Center, National Institute of Allergy and Infectious Diseases, NIH, by a grant from the NIH Office of AIDS Research, by the Bill and Melinda Gates Foundation, and by federal funds from the Frederick National Laboratory for Cancer Research, NIH, under contract HHSN261200800001 (to Y.T.).
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P.Z. and P.L. conceived and supervised the project; P.Z., E.N., S.D., K.B., Y.L., Q.L., H.M., H.S., D.R., S.F., S.M.E., V.P., K.B., M.P., X.C., E.K.S. and D.R.A. performed the experiments; D.W., J.M., J.S. and R.H. provided veterinary care and performed the immunizations and viral challenges; R.G. and M.A.M. provided critical reagents and expertise for the NHP challenge study; Y.T. performed the NSEM analysis; Z.H. and D.F. performed the statistical analysis; A.F., G.C., S.H., G.S.-J., A.C., A.M.D., R.A.K., J.R.M. and A.S.F. participated in the study design; P.Z. and P.L. wrote the original draft of the paper; all of the authors contributed to the final review of the paper and the editing.
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P.L., P.Z., and E.N. are named on a HIV RNA Vaccine patent (PCT/US2020/022710). E.N., S.F., S.M.E., V.P., K.B., S.H., G.S.-J. and A.C. are employees of Moderna Inc. and hold equities from the company. All other authors have no competing interests.
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Extended data
Extended Data Fig. 1 Utilization of macaque CD4 by wild-type and mutated HIV-1 Envs.
Ability of three wild-type (WT) and corresponding aa. 375-mutated HIV-1 strains to utilize rhesus macaque CD4 (rhCD4) for infection. rhCD4 transfection and pseudovirus infection are described in the Methods section.
Extended Data Fig. 2 Induction of trimer-binding antibodies in the two subgroups of immunized macaques over time.
Subgroup 1 received 5 mRNA and 5 protein immunizations; subgroup 2 received 8 mRNA and 2 protein immunizations. a. Serum titers of antibodies binding to the autologous trimer as assayed by ELISA using the WITO SOSIP.664 trimer captured on lectin-coated plates. b. Serum titers of antibodies binding to the autologous V3 loop peptide (WITO pV3) as assayed using the linear WITO V3 peptide directly coated on the plate surface. c. Serum titers of antibodies binding to a heterologous trimer (AD8) as assayed by ELISA using the AD8 IP trimer captured on lectin-coated plates. Statistical differences were calculated using a paired two-tailed t-test. The sequence and timing of immunizations are indicated by color-coded triangles on the top.
Extended Data Fig. 3 Induction of autologous neutralizing antibodies in the two subgroups of immunized macaques.
Subgroup 1 received 5 mRNA and 5 protein immunizations; subgroup 2 received 8 mRNA and 2 protein immunizations. a. Serum titers of neutralizing antibodies against the autologous Env (WITO4160.27), as assayed using pseudoviruses on TZM-bl cells. The sequence and timing of immunizations are indicated by color-coded triangles on the top. b. Effect of the autologous linear V3-loop peptide (WITO pV3) on autologous neutralization at two time points (week 29 and 37). The assays were performed by incubating the linear V3 peptide with macaque sera prior to addition to the pseudovirus stock. The asterisk denotes a p value <0.05, as assessed by two-tailed paired t-test.
Extended Data Fig. 4 Induction of heterologous neutralizing antibodies in immunized macaques.
a. Serum titers of neutralizing antibodies against a heterologous tier-1a Env (SF162). b. Serum titers of neutralizing antibodies against a heterologous tier-1b Env (BaL). c. Neutralization of SF162 in the two vaccine subgroups. d. Neutralization of BaL in the two vaccine subgroups. The asterisk denotes a p value <0.05, as assessed by two-tailed unpaired t-test. e. Neutralization of the tier-2 Env JR-FL in the two vaccine subgroups. f. Neutralization of the tier-2 Env AD8 in the two vaccine subgroups. g. Serum titers of neutralizing antibodies against a panel of heterologous tier-2 Envs at week 58 in the two vaccine subgroups. Neutralization assays were performed using pseudoviruses on TZM-bl cells. The sequence and timing of immunizations are indicated by color-coded triangles on the top. Subgroup 1 received 5 mRNA and 5 protein immunizations; subgroup 2 received 8 mRNA and 2 protein immunizations.
Extended Data Fig. 5 SIV Gag-specific T-cell responses.
Induction of SIV Gag-specific CD4+ and CD8+ T-cell responses in all 7 vaccinated macaques at weeks 27 and 60 of immunization. a. Gag-specific CD4+ T-cell responses calculated as fractions of memory CD4+ T cells expressing CD154 and the indicated intracellular cytokines or CD69. b. Gag-specific CD8+ T-cell responses calculated as fractions of memory CD8+ T cells expressing CD69 and the indicated intracellular cytokines or CD107. c. Correlation between a subset of Env-specific T-follicular helper cells (CXCR5+CXCR3-PD-1+) and protection in vaccinated macaques. The correlation was statistically significant after exclusion of a single outlier (macaque V7, highlighted in red). The correlation coefficient and P value with the inclusion of the outlier are indicated in red.
Extended Data Fig. 6 Vaccine-induced protection in the two subgroups of immunized macaques challenged with SHIV AD8.
Subgroup 1 received 5 mRNA and 5 protein immunizations; subgroup 2 received 8 mRNA and 2 protein immunizations. a. Kaplan-Meier analysis of virus-free survival in the course of 13 weekly intrarectal inoculation of 10 TCID50 of SHIV AD8 (red arrows) in the two subgroups of immunized macaques. Infection was evaluated by the appearance of plasma viremia on two subsequent tests using a sensitive real-time PCR method. Significance was calculated by the Wilcoxon exact test. b. Statistical analysis of hazard ratio and per-exposure risk in the two subgroups of immunized macaques, as assessed by 1 minus the hazard ratio, estimated from a Cox proportional hazards regression via the exact partial likelihood with group (vaccinated versus control) as the regressor. c. Mean levels of viremia (± SD) in macaques in the two vaccine subgroups synchronized by peak of viremia. Levels of viremia were evaluated by quantitative real-time PCR. The courses of viremia in different animals were aligned by setting the peak of viremia at day 21 for each animal.
Extended Data Fig. 7 Epitope mapping of trimer-binding antibodies in serum from vaccinated macaques.
a. Competition with HIV-1 bNAbs, as assessed by ELISA on lectin-captured HIV-1 BG505 SOSIP.664 trimers. b. Competition with macaque monoclonal antibodies directed against off-target and non-bNAb-target regions (RM20A3, RM20C, RM20E1, RM20F, RM20G, RM20J, RM15E and RM54B1). TB: trimer base; GH: glycan holes; V1: V1 loop; FP: fusion peptide.
Extended Data Fig. 8 Polyclonal epitope mapping of trimer-binding antibodies in a representative protected animal by negative-staining electron microscopy (NSEM).
The analysis was performed using purified Fab fragments isolated from serum collected from macaque V3 (subgroup 1) at week 58. The arrow heads point to the trimer-bound Fab fragments. Visualization of antibodies binding to: a. A region compatible with the CD4-BS deep in the inter-protomer groove; b. A region in the inter-protomer groove more distal from the trimer axis than the CD4-BS; c. A region(s) at the trimer apex targeted by 2 Fabs simultaneously; d. A region at the trimer apex compatible with the V2-glycan supersite targeted by a single Fab; e. A region at the trimer base, presumably constituted by neo-epitopes produced by gp41 truncation.
Extended Data Fig. 9 Correlation between vaccine-induced protection and antibodies against specific epitopes, infected cells or ADCC.
a. Correlation between protection and antibodies against an autologous linear V3 peptide (WITO pV3). b. Correlation between protection and antibodies against a heterologous linear V3 peptide (JR-FL V3). c. Correlation between protection and antibodies against a V1V2 scaffolded protein (gp70 V1V2). d. Correlation between protection and antibodies binding to the surface of SHIV AD8-infected primary CD4+ T cells. The results are mean values from two experiments. The correlation becomes significant after exclusion of an outlier (macaque V7, highlighted in red). The correlation coefficient and P value with the inclusion of the outlier are indicated in red. e. Correlation between protection and antibodies mediating ADCC against SHIV AD8-infected primary CD4+ T cells. The results are mean values from two experiments. The correlation becomes significant after exclusion of an outlier (macaque V1, highlighted in red). The correlation coefficient and P value with the inclusion of the outlier are indicated in red. f. Inhibitory effect of a VRC01 Fab fragment on macaque antibody binding to SHIV AD8-infected primary CD4+ T cells. C denotes Fab-untreated controls. All correlations were determined by the Spearman test.
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Zhang, P., Narayanan, E., Liu, Q. et al. A multiclade env–gag VLP mRNA vaccine elicits tier-2 HIV-1-neutralizing antibodies and reduces the risk of heterologous SHIV infection in macaques. Nat Med 27, 2234–2245 (2021). https://doi.org/10.1038/s41591-021-01574-5
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DOI: https://doi.org/10.1038/s41591-021-01574-5
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