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Immunoprofiling Identifies Functional B and T Cell Subsets Induced by an Attenuated Whole Parasite Malaria Vaccine as Correlates of Sterile Immunity
oleh: Marie Mura, Pinyi Lu, Tanmaya Atre, Jessica S. Bolton, Elizabeth H. Duncan, Sidhartha Chaudhury, Elke S. Bergmann-Leitner
Format: | Article |
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Diterbitkan: | MDPI AG 2022-01-01 |
Deskripsi
Immune correlates of protection remain elusive for most vaccines. An identified immune correlate would accelerate the down-selection of vaccine formulations by reducing the need for human pathogen challenge studies that are currently required to determine vaccine efficacy. Immunization via mosquito-delivered, radiation-attenuated <i>P. falciparum</i> sporozoites (IMRAS) is a well-established model for efficacious malaria vaccines, inducing greater than 90% sterile immunity. The current immunoprofiling study utilized samples from a clinical trial in which vaccine dosing was adjusted to achieve only 50% protection, thus enabling a comparison between protective and non-protective immune signatures. In-depth immunoprofiling was conducted by assessing a wide range of antigen-specific serological and cellular parameters and applying our newly developed computational tools, including machine learning. The computational component of the study pinpointed previously un-identified cellular T cell subsets (namely, TNFα-secreting CD8<sup>+</sup>CXCR3<sup>−</sup>CCR6<sup>−</sup> T cells, IFNγ-secreting CD8<sup>+</sup>CCR6<sup>+</sup> T cells and TNFα/FNγ-secreting CD4<sup>+</sup>CXCR3<sup>−</sup>CCR6<sup>−</sup> T cells) and B cell subsets (i.e., CD19<sup>+</sup>CD24<sup>hi</sup>CD38<sup>hi</sup>CD69<sup>+</sup> transitional B cells) as important factors predictive of protection (92% accuracy). Our study emphasizes the need for in-depth immunoprofiling and subsequent data integration with computational tools to identify immune correlates of protection. The described process of computational data analysis is applicable to other disease and vaccine models.