Gastric eosinophils are detrimental for Helicobacter pylori vaccine efficacy.

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Etat: Public
Version: Final published version
Licence: CC BY-NC-ND 4.0
ID Serval
serval:BIB_369D55787F13
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Gastric eosinophils are detrimental for Helicobacter pylori vaccine efficacy.
Périodique
Vaccine
Auteur⸱e⸱s
Vaillant L., Oster P., McMillan B., Velin D.
ISSN
1873-2518 (Electronic)
ISSN-L
0264-410X
Statut éditorial
Publié
Date de publication
16/06/2021
Peer-reviewed
Oui
Volume
39
Numéro
27
Pages
3590-3601
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
Helicobacter pylori (Hp) colonizes the human gastric mucosa with a high worldwide prevalence. Currently, Hp can be eradicated by the use of antibiotics. Due to the increase of antibiotic resistance, new therapeutic strategies need to be devised: one such approach being prophylactic vaccination. Pre-clinical and clinical data showed that a urease-based vaccine is efficient in decreasing Hp infection through the mobilization of T helper (Th)-dependent immune effectors, including eosinophils. Preliminary data have shown that upon vaccination and subsequent Hp infection, eosinophils accumulate in the gastric mucosa, suggesting a possible implication of this granulocyte subset in the vaccine-induced reduction of Hp infection. In our study, we confirm that activated eosinophils, expressing CD63, CD40, MHCII and PD-L1 at their cell surface, infiltrate the gastric mucosa during vaccine-induced reduction of Hp infection. Strikingly, we provide evidence that bone marrow derived eosinophils efficiently kill Hp in vitro, suggesting that eosinophils may participate to the vaccine-induced reduction of Hp infection. However, conversely to our expectations, the absence of eosinophils does not decrease the efficacy of this Hp vaccine in vivo. Indeed, vaccinated mice that have been genetically ablated of the eosinophil lineage or that have received anti-Sialic acid-binding immunoglobulin-like lectin F eosinophil-depleting antibodies, display a lower Hp colonization when compared to their eosinophil sufficient counterparts. Although the vaccine induces similar urease-specific humoral and Th responses in both eosinophil sufficient and deficient mice, a decreased production of anti-inflammatory cytokines, such as IL-10, TGFβ, and calgranulin B, was specifically observed in eosinophil depleted mice. Taken together, our results suggest that gastric eosinophils maintain an anti-inflammatory environment, thus sustaining chronic Hp infection. Because eosinophils are one of the main immune effectors mobilized by Th2 responses, our study strongly suggests that the formulation of an Hp vaccine needs to include an adjuvant that preferentially primes Hp-specific Th1/Th17 responses.
Mots-clé
Animals, Eosinophils, Gastric Mucosa, Helicobacter Infections/prevention & control, Helicobacter pylori, Mice, Stomach, Th2 response, Vaccine
Pubmed
Web of science
Open Access
Oui
Création de la notice
15/06/2021 8:17
Dernière modification de la notice
03/08/2023 5:57
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