1. Innate and adaptive nasal mucosal immune responses following experimental human pneumococcal colonization
- Author
-
Jochems, Simon P., de Ruiter, Karin, Solorzano, Carla, Voskamp, Astrid, Mitsi, Elena, Nikolaou, Elissavet, Carniel, Beatriz F., Pojar, Sherin, German, Esther L., Reine, Jesus, Soares-Schanoski, Alessandra, Hill, Helen, Robinson, Rachel, Hyder-Wright, Angela D., Weight, Caroline M., Durrenberger, Pascal F., Heyderman, Robert S., Gordon, Stephen B., Smits, Hermelijn H., Urban, Britta C., Rylance, Jamie, Collins, Andrea M., Wilkie, Mark D., Lazarova, Lepa, Leong, Samuel C., Yazdanbakhsh, Maria, and Ferreira, Daniela M.
- Subjects
Thermo Fisher Scientific Inc. ,Polysaccharides ,B cells ,Pneumonia ,Immune response ,Scientific equipment industry ,T cells ,Lung diseases ,Infection ,Streptococcus pneumoniae ,Respiratory tract diseases ,Health care industry - Abstract
Streptococcus pneumoniae (Spn) is a common cause of respiratory infection, but also frequently colonizes the nasopharynx in the absence of disease. We used mass cytometry to study immune cells from nasal biopsy samples collected following experimental human pneumococcal challenge in order to identify immunological mechanisms of control of Spn colonization. Using 37 markers, we characterized 293 nasal immune cell clusters, of which 7 were associated with Spn colonization. B cell and [CD161.sup.+][CD8.sup.+] T cell clusters were significantly lower in colonized than in noncolonized subjects. By following a second cohort before and after pneumococcal challenge we observed that B cells were depleted from the nasal mucosa upon Spn colonization. This associated with an expansion of Spn polysaccharide- specific and total plasmablasts in blood. Moreover, increased responses of blood mucosa-associated invariant T (MAIT) cells against in vitro stimulation with pneumococcus prior to challenge associated with protection against establishment of Spn colonization and with increased mucosal MAIT cell populations. These results implicate MAIT cells in the protection against pneumococcal colonization and demonstrate that colonization affects mucosal and circulating B cell populations., Introduction Streptococcus pneumoniae (Spn) is a major cause of morbidity and mortality worldwide (1, 2). It is the most common bacterial cause of otitis media, pneumonia, and meningitis in children [...]
- Published
- 2019
- Full Text
- View/download PDF