Delivery of antigen to nasal-associated lymphoid tissue microfold cells through secretory IgA targeting local dendritic cells confers protective immunity

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Presentation transcript:

Delivery of antigen to nasal-associated lymphoid tissue microfold cells through secretory IgA targeting local dendritic cells confers protective immunity Nicolas Rochereau, PhD, Vincent Pavot, PhD, Bernard Verrier, PhD, Fabienne Jospin, Agathe Ensinas, Christian Genin, MD, Blaise Corthésy, PhD, Stéphane Paul, PhD Journal of Allergy and Clinical Immunology Volume 137, Issue 1, Pages 214-222.e2 (January 2016) DOI: 10.1016/j.jaci.2015.07.042 Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 1 Specific uptake and transport of p24-SIgA across the murine NALT. A, NALT staining with hematoxylin and eosin. B-I, p24-SIgA (Fig 1, B, C, D, and H) or p24 alone (Fig 1, E, F, G, and I) was intranasally administered and incubated for 60 minutes in the nasal cavity. p24 staining was performed with an HIV-1+ serum. Anti-HIV antibodies were detected with Cy3-conjugated anti-human IgG. Cell staining was performed with anti-human DC-SIGN, anti-mouse Dectin-1, anti-mouse glycoprotein 2 (GP2), or UEA-1, all conjugated with fluorescein isothiocyanate. In contrast to p24 alone showing luminal red spots, interaction between p24-SIgA and GP2+, Dectin-1+, or UEA-1+ M cells or DC-SIGN+ DCs resulted in yellow dots on green-labeled cells. Images were obtained from single optical sections acquired by means of confocal microscopy. On all panels, dotted lines delineate the interface between the nasal cavity and tissue (side view). Experiments have been repeated twice showing similar results. Journal of Allergy and Clinical Immunology 2016 137, 214-222.e2DOI: (10.1016/j.jaci.2015.07.042) Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 2 p24-specific IgA, IgG, IgG1, and IgG2a responses after nasal administration of p24-SIgA complexes. A-C, Mice were immunized intranasally with PBS, p24, p24+HLT, p24-SIgA, p24-SIgA+HLT, and p24-PLA nanoparticles and immunized through the subcutaneous route with p24-alum. Fig 2, A, Serum, feces, vaginal lavage samples, and saliva were isolated 1 week after the last immunization. Data are shown as medians ± 95% intervals, and the minimum and maximum are indicated (left and middle columns) or shown as means ± SEMs (right column). Dotted lines indicate the limit of detection (Fig 2, B and C). Spleens and intestines were isolated after 41 days, and ELISpot assays were performed on IgG and IgA antibody-secreting cells (ASC). Data are shown as medians ± 95% intervals, and the minimum and maximum are indicated. ANOVA followed by the Bonferroni post hoc test (left and middle columns) and the Student t test (right column, comparison between IgG1 and IgG2a within the same experimental group) were performed. *P < .05, **P < .01, and ***P < .005. Data from 2 independent experiments consisting of 5 mice per group showing very close results have been pooled (total n = 10). Journal of Allergy and Clinical Immunology 2016 137, 214-222.e2DOI: (10.1016/j.jaci.2015.07.042) Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 3 p24-specific IgA and IgG responses after nasal administration of p24-SIgA complexes in Dectin-1 KO mice. p24-specific IgA and IgG responses were measured in serum after nasal administration of p24-SIgA complexes in Dectin-1 KO mice versus wild-type (WT) mice. Column content and statistical analyses are as explained in the legend of Fig 2. ***P < .005. Journal of Allergy and Clinical Immunology 2016 137, 214-222.e2DOI: (10.1016/j.jaci.2015.07.042) Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 4 p24-specific cellular responses after nasal administration of p24-SIgA complexes. A, Mice were immunized with PBS, p24, p24+HLT, p24-SIgA, and p24-SIgA+HLT. Splenocytes and vaginal cells were evaluated by using ELISpot assays for IFN-γ–producing cells. Data are shown as medians + 95% intervals, and the minimum and maximum are indicated. Data were pooled from 2 separate experiments, consisting of 5 mice per group (total n = 10). ANOVA followed by the Bonferroni post hoc test was performed. *P < .05 and ***P < .005. SFC, Spot-forming cells. B, Cytokine concentrations were determined in triplicate by using the Luminex cytokine assay. Cytokine profiles are shown as radar charts; each axis displays the mean quantity (in picograms per milliliter) of each cytokine/chemokine after immunization with p24-SIgA, p24-SIgA+HLT, and p24+HLT (upper panel) and SIgA, p24, and PBS (lower panel). The values of each axis were joined to form the central polygon area, which represents the overall cytokine balance. Increasing or decreasing central polygon areas reflect higher or lower expression of the protein under analysis. The experiment was repeated twice with 5 mice for each group showing similar results. P values have been calculated by comparing the p24-SIgA group with the p24+HLT group. *P < .05. Ch, Chemokines; IR, mediator of the inflammatory response. Journal of Allergy and Clinical Immunology 2016 137, 214-222.e2DOI: (10.1016/j.jaci.2015.07.042) Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 5 Challenge with recombinant vaccinia virus expressing p24. Mice were challenged intranasally with p24-expressing recombinant vaccinia virus (4 × 107 plaque-forming units) 1 week after the last immunization with PBS, p24, or p24-SIgA. Naive, Nonimmunized noninfected mice. Protection of mice was assessed based on weight loss (A), survival rate (B), and lung viral load (C). Diagrams show means ± SEMs of 5 mice for each group. ANOVA followed by the Bonferroni post hoc test was performed. ***P < .005 indicates the difference between the p24-SIgA and p24 groups. p24-specific antibody responses were measured before (day 41) and after (day 47) the challenge at systemic (D) and mucosal (vaginal; E) levels. Journal of Allergy and Clinical Immunology 2016 137, 214-222.e2DOI: (10.1016/j.jaci.2015.07.042) Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions