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Article Dans Une Revue Cell Host & Microbe Année : 2024

A conserved antigen induces respiratory Th17-mediated broad serotype protection against pneumococcal superinfection

Jan-Willem Veening

Résumé

Several vaccines targeting bacterial pathogens show reduced efficacy upon concurrent viral infection, indicating that a new vaccinology approach is required. To identify antigens for the human pathogen Streptococcus pneumoniae that are effective following influenza infection, we performed CRISPRi-seq in a murine model of superinfection and identified the conserved lafB gene as crucial for virulence. We show that LafB is a membrane-associated, intracellular protein that catalyzes the formation of galactosyl-glucosyl-diacylglycerol, a glycolipid important for cell wall homeostasis. Respiratory vaccination with recombinant LafB, in contrast to subcutaneous vaccination, was highly protective against S. pneumoniae serotypes 2, 15A, and 24F in a murine model. In contrast to standard capsule-based vaccines, protection did not require LafB-specific antibodies but was dependent on airway CD4+ T helper 17 cells. Healthy human individuals can elicit LafB-specific immune responses, indicating LafB antigenicity in humans. Collectively, these findings present a universal pneumococcal vaccine antigen that remains effective following influenza infection.
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Dates et versions

inserm-04605118 , version 1 (07-06-2024)

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Citer

Xue Liu, Laurye van Maele, Laura Matarazzo, Daphnée Soulard, Vinicius Alves Duarte da Silva, et al.. A conserved antigen induces respiratory Th17-mediated broad serotype protection against pneumococcal superinfection. Cell Host & Microbe, 2024, 32 (3), pp.304-314.e8. ⟨10.1016/j.chom.2024.02.002⟩. ⟨inserm-04605118⟩
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