After a three-step production protocol comprising affinity and size exclusion chromatography, native-like trimer fractions binding to the quaternary-specific bNAb PGT151 were pooled, QCd by analytical SEC and blue native PAGE (S1 Fig), and analyzed for binding by Octet Bio Layer Interferometry (S2 Fig). Statistical significance was determined by t-tests.(TIF) pone.0233577.s003.TIF (78K) GUID:?8DAA37B1-62D5-4B86-AC75-4E75E3DE2A3C S4 Fig: Innate cell flow cytometry gating strategy. A) Stained PBMCs were first gated on single, live, CD3- cells, followed by identification of myeloid dendritic cells (mDCs) using the markers HLADR+CD14-CD20-CD11c+. B) mDCs were then phenotyped using the markers CD80, CD86 and CD83.(TIF) pone.0233577.s004.TIF (209K) GUID:?4F120230-1576-4240-9B2B-50928E4224E2 S5 Fig: The gating strategy used to define the B cell populations in the peripheral blood consisted of gating on singlets (A), then lymphocytes (B), followed by exclusion of lifeless/CD3+ cells (C). The surface markers CD21 and CD27 were used to distinguish the following B cell subsets: activated memory ADH-1 trifluoroacetate (CD20+CD21-CD27+), resting memory (CD20+CD21+CD27+), tissue-like memory (CD20+CD21-CD27-) and naive (CD20+CD21+CD27-) (D). The expression of surface immunoglobulin M (IgM) and D (IgD) within each B cell subset was decided as shown (E). The expression of surface immunoglobulin G (IgG) was determined by first gating around the IgD-IgM- populace, followed by gating around the IgG+ populace (F).(TIF) pone.0233577.s005.TIF (365K) GUID:?4476B47F-9C41-47CF-AEFE-E6507893767C S6 Fig: Chaotrope avidity of envelope-specific plasma IgGbinding curves. Avidity of envelope-specific IgG (week 17) was measured by ELISA using 2M ammonium thiocyanate (NH4SCN) treatment. ADH-1 trifluoroacetate Individual macaques are denoted by sign color and ADH-1 trifluoroacetate shape, NH4SCN-treated samples are Slc4a1 indicated by dashed lines, PBS-treated samples are indicated by solid lines.(TIF) pone.0233577.s006.TIF (129K) GUID:?EA56BE7B-BFAA-452C-A835-B48AF3052B5F S7 Fig: Neutralization Panel of Tier 1 isolates. Plasma from week 17 (1 week post 3rd immunization) ADH-1 trifluoroacetate were tested for neutralizing activity in the TZM-bl assay. Plasma were tested a dilution of 1 1:50 in triplicate wells and compared against virus-alone access. Each data point represents the average of triplicate wells. The viruses derive from clades A, B, and C, and are known to have a tier 1, easy to neutralize phenotype. The standard cutoff of 50% is usually noted by a dotted collection.(TIF) pone.0233577.s007.TIF (61K) GUID:?E249311D-89B7-4C4C-B3FB-959C9CD570CF Data Availability StatementAll relevant data are within the paper and its Supporting Information files. Abstract Development of a successful HIV vaccine is dependent upon a determination of the optimum antigen and adjuvant as well as choosing an optimal site for vaccine delivery. The site of delivery is particularly relevant as HIV transmission generally requires that this computer virus crosses a mucosal membrane to infect a new host. Here we undertake a pilot study comparing three vaccine delivery routes, two to the oral cavity (intraepithelial (iEp) and needle-free (NF-Injex)) as well as intramuscular (IM) delivery. These vaccinations utilized a recombinant HIV-1 Env trimer 10042.05 from an elite neutralizer, subject VC10042, that has previously induced high titers of cross-clade reactive V1V2 antibodies. The 10042.05.SOSIP fused trimer was administered with adjuvants R848 (Resiquimod), MPLA and Alhydrogel to characterize the innate cellular and anti-HIV Envelope (Env) antibody responses following the administration of the vaccine to the oral mucosa. Oral delivery of the 10042.05.SOSIP induced high titers of anti-V1V2 antibodies, which together with previous studies, indicates an immunogenic bias toward the V1V2 regions in 10042-derived Envs. Both types of oral vaccine delivery resulted in immunologic and serologic responses that were comparable to the IM delivery route. Furthermore, induction of anti-V1-V2 specific antibodies was best following iEp delivery of the oral vaccine identifying this as the optimal method to orally deliver this vaccine formulation. Introduction The HIV-1 epidemic continues to exact a massive human and economic toll. Efforts to increase access to antiretroviral therapies have brought the number of yearly deaths from HIV-1 to below 1 million per year (UNAIDS). However, decreases in the rate of viral acquisition have not kept pace and remain at 1.8M new infections each year, pushing the total quantity of infections toward 37 million people worldwide. Thus, development of an effective vaccine remains the ultimate goal for the induction of a protective, long lasting memory and quick recall immune response to prevent contamination from a future HIV exposure. An effective HIV-1 vaccine remains elusive, with only one clinical trial, RV144, resulting in efficacy against viral acquisition [1]. This trial resulted in ~34% reduction in viral acquisition, and follow-on analyses indicated that neutralizing antibodies were not associated with protection from contamination [1C3]. Rather, anti-V1V2 loop IgG was identified as the major correlate of reduced risk. In addition, Fc-mediated functional activity of the anti-V1V2 antibodies are associated with reduced risk of contamination [3C9]. These findings imply that non-neutralizing activities can contribute to protection in an eventual vaccine. While the field continues to focus on eliciting broadly neutralizing antibodies (bNAbs) [10C13], there remain significant hurdles to overcome, including a.