Limited vaccine-induced CD8+ T cell immunity in HIV-infected immunological nonresponders
Vivien Karl, Anne Graeser, Anastasia Kremser, Liane Bauersfeld, Florian Emmerich, Nadine Herkt, Siegbert Rieg, Susanne Usadel, Bertram Bengsch, Tobias Boettler, Hendrik Luxenburger, Christoph Neumann-Haefelin, Matthias C. Müller, Robert Thimme, Maike Hofmann
Vivien Karl, Anne Graeser, Anastasia Kremser, Liane Bauersfeld, Florian Emmerich, Nadine Herkt, Siegbert Rieg, Susanne Usadel, Bertram Bengsch, Tobias Boettler, Hendrik Luxenburger, Christoph Neumann-Haefelin, Matthias C. Müller, Robert Thimme, Maike Hofmann
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Clinical Research and Public Health AIDS/HIV Immunology Virology

Limited vaccine-induced CD8+ T cell immunity in HIV-infected immunological nonresponders

Abstract

BACKGROUND Among people living with HIV (PLWH), immunological nonresponders (INR) fail to adequately restore CD4+ T cell counts despite effective antiretroviral therapy (ART), placing them at greater risk for adverse outcomes and reduced vaccine efficacy. We aimed to study the robustness and longevity of vaccine-induced virus-specific cellular immune responses in INR.METHODS Virus-specific CD8+ T cell responses were analyzed in INR (CD4+ T cell count < 300 cells/μL) and immunological responders (IR) (CD4+ T cell count > 500 cells/μL), receiving ART, and HIV-uninfected controls following COVID-19 mRNA vaccination and infection. Virus-specific CD8+ T cells were characterized using peptide-loaded MHC I tetramer technology, after in vitro expansion and cytokine production assays. Virus-specific CD4+ T cells and IgG levels were determined by activation-induced marker (AIM) assay and ELISA, respectively.RESULTS We demonstrated that, while long-lasting virus-specific cellular immune responses were generated in INR, CD8+ T cell immunity remained limited compared with robust CD4+ T cell reactivity. CD8+ T cell responses in INR exhibited reduced breadth and frequency, accompanied by altered memory differentiation and suboptimal activation and effector response upon antigen exposure. This deficiency correlated with low CD4+ T cell counts, independent of other disease markers, highlighting the pivotal role of CD4+ T cells in orchestrating vaccine-induced immunity. Notably, repeated booster vaccinations enhanced virus-specific CD8+ T cell responses.CONCLUSION INR elicit limited vaccine-induced virus-specific CD8+ T cell immunity, but booster vaccinations can enhance these responses, suggesting better immune outcomes with tailored vaccination strategies.FUNDING Helmholtz Society, German Research Foundation, Federal Ministry of Education and Research.

Authors

Vivien Karl, Anne Graeser, Anastasia Kremser, Liane Bauersfeld, Florian Emmerich, Nadine Herkt, Siegbert Rieg, Susanne Usadel, Bertram Bengsch, Tobias Boettler, Hendrik Luxenburger, Christoph Neumann-Haefelin, Matthias C. Müller, Robert Thimme, Maike Hofmann

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Figure 4

Similar in vitro and in vivo recall responses of spike-specific CD8+ T cells in INR and HC.

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Similar in vitro and in vivo recall responses of spike-specific CD8+ T c...
(A) Experimental setup of in vitro expansion of peptide-specific CD8+ T cells. (B) Representative dot plot and percentages of expanded spike-specific CD8+ T cells on day 14. Results are shown for HC (n = 23) and INR (n = 10) > 90 days after second (gray; green) or third (white; dark green) mRNA vaccination. (C) In vitro expansion capacity of spike-specific CD8+ T cells from day 0 to day 14 in HC (n = 23) and INR (n = 10) > 90 days after second (gray; green) or third (white; dark green) mRNA vaccination. (D) Representative dot plots and percentages of cytokine-producing CD8+ T cells, including polyfunctional populations, are shown relative to the frequency of spike-specific CD8+ T cells after in vitro expansion > 90 days after second (gray; green) or third (white; dark green) mRNA vaccination. (E) Calculated ex vivo frequencies of spike-specific CD8+ T cells before (HC n = 23; INR n = 10) and 7–14 days after (HC n = 9; INR n = 4) third vaccination. The ratio is calculated of the median frequency before versus after third vaccination of HC and INR, respectively. Median values are depicted with 95% CI error bars. Statistical analysis was performed with a 2-tailed Mann-Whitney U test (B–D), a 2-way ANOVA with Šídák’s multiple-comparison test to compare the polyfunctionality (D), and a Kruskal-Wallis test and Dunn’s multiple-comparison test to compare the frequencies of spike-specific CD8+ T cells pre versus post booster vaccination (E). Circles indicate vaccine-induced CD8+ T cell responses. Triangles indicate hybrid immunity. *P < 0.05, **P < 0.01.