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Impact of HLA polymorphism on the immune response to Bacillus anthracis protective antigen in vaccination versus natural infection

Ascough, Stephanie, Ingram, Rebecca J., Chu, Karen K. Y., Moore, Stephen J., Gallagher, Theresa, Dyson, Hugh, Doganay, Mehmet, Metan, Gökhan, Ozkul, Yusuf, Baillie, Les ORCID:, Williamson, E. Diane, Robinson, John H., Maillere, Bernard, Boyton, Rosemary J. and Altmann, Daniel M. 2022. Impact of HLA polymorphism on the immune response to Bacillus anthracis protective antigen in vaccination versus natural infection. Vaccines 10 (10) , 1571. 10.3390/vaccines10101571

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The causative agent of anthrax, Bacillus anthracis, evades the host immune response and establishes infection through the production of binary exotoxins composed of Protective Antigen (PA) and one of two subunits, lethal factor (LF) or edema factor (EF). The majority of vaccination strategies have focused upon the antibody response to the PA subunit. We have used a panel of humanised HLA class II transgenic mouse strains to define HLA-DR-restricted and HLA-DQ-restricted CD4+ T cell responses to the immunodominant epitopes of PA. This was correlated with the binding affinities of epitopes to HLA class II molecules, as well as the responses of two human cohorts: individuals vaccinated with the Anthrax Vaccine Precipitated (AVP) vaccine (which contains PA and trace amounts of LF), and patients recovering from cutaneous anthrax infections. The infected and vaccinated cohorts expressing different HLA types were found to make CD4+ T cell responses to multiple and diverse epitopes of PA. The effects of HLA polymorphism were explored using transgenic mouse lines, which demonstrated differential susceptibility, indicating that HLA-DR1 and HLA-DQ8 alleles conferred protective immunity relative to HLA-DR15, HLA-DR4 and HLA-DQ6. The HLA transgenics enabled a reductionist approach, allowing us to better define CD4+ T cell epitopes. Appreciating the effects of HLA polymorphism on the variability of responses to natural infection and vaccination is vital in planning protective strategies against anthrax.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Pharmacy
Additional Information: License information from Publisher: LICENSE 1: URL:, Type: open-access
Publisher: MDPI
Date of First Compliant Deposit: 10 October 2022
Date of Acceptance: 14 September 2022
Last Modified: 09 May 2023 09:31

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