Cited by 181Adenosine and Purinergic SignalingT-cell and B-cell ImmunologyImmune Response and Inflammation

ATP-gated ionotropic P2X7 receptor controls follicular T helper cell numbers in Peyer’s patches to promote host-microbiota mutualism

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Proietti, Michele, Cornacchione, Vanessa, Rezzonico Jost, Tanja, Romagnani, Andrea, Faliti, Caterina Elisa, Perruzza, Lisa, Rigoni, Rosita, Radaelli, Enrico +8 more·2014·Immunity

Abstract

Microbial colonization of the gut induces the development of gut-associated lymphoid tissue (GALT). The molecular mechanisms that regulate GALT function and result in gut-commensal homeostasis are poorly defined. T follicular helper (Tfh) cells in Peyer's patches (PPs) promote high-affinity IgA responses. Here we found that the ATP-gated ionotropic P2X7 receptor controls Tfh cell numbers in PPs. Lack of P2X7 in Tfh cells enhanced germinal center reactions and high-affinity IgA secretion and binding to commensals. The ensuing depletion of mucosal bacteria resulted in reduced systemic translocation of microbial components, lowering B1 cell stimulation and serum IgM concentrations. Mice lacking P2X7 had increased susceptibility to polymicrobial sepsis, which was rescued by Tfh cell depletion or administration of purified IgM. Thus, regulation of Tfh cells by P2X7 activity is important for mucosal colonization, which in turn results in IgM serum concentrations necessary to protect the host from bacteremia.

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Crossref · 10.1016/j.immuni.2014.10.010

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  • The subsequent reduction in B1-cell stimulation is believed to cause increased susceptibility of P2rx7−/− mice to polymicrobial sepsis.

    “The subsequent reduction in B1-cell stimulation is believed to cause increased susceptibility of P2rx7−/− mice to polymicrobial sepsis (Proietti et al., 2014).”
  • This results in an increase in high-affinity IgA specific for intestinal bacteria secreted into the lumen and a depletion of the gut microbiota.

    “This results in an increase in high-affinity IgA specific for intestinal bacteria secreted into the intestinal lumen and thereby a depletion of the gut microbiota.”
  • P2rx7−/− mice have elevated Tfh cell numbers in the intestinal mucosa, presumably because they are resistant to ATP-induced cell death.

    “Mice deficient for P2X7 (P2rx7−/−) have elevated Tfh cell numbers in the intestinal mucosa, presumably because they are resistant to ATP-induced cell death.”
  • Impairment of Tfh cells resulting from lack of expression of PD-1 or P2RX7 can alter gut microbiota composition.

    “Tfh cells are implicated in maintenance of microbiota homeostasis as highlighted by studies showing that impairment of Tfh cells resulting from lack of expression of co-receptor programmed cell death 1 (PD-1) or ATP-gated ionotropic P2RX7 receptor can alter gut microbiota composition.117,118”
  • Sensing of commensal-derived lipopolysaccharide is necessary for development of B1 cells in mouse spleen and for maintenance of basal circulating IgM, which protects in the cecal ligation and puncture sepsis model.

    “sensing of commensal-derived LPS has been shown to be necessary for the development of B1 cells in mouse spleen and for the maintenance of basal levels of circulating IgM, which exert a protective role in the cecal ligation and puncture (CLP)-induced sepsis model [47].”

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Authors
Proietti, M., Cornacchione, V., Rezzonico Jost, T., Romagnani, A., Faliti, C. E., Perruzza, L., Rigoni, R., Radaelli, E., Caprioli, F., Preziuso, S., Brannetti, B., Thelen, M., McCoy, K. D., Slack, E., Traggiai, E., & Grassi, F.
Affiliations
  • Institute for Research in Biomedicine (CH)
  • Novartis (Switzerland) (CH)
  • University of Bern (CH)
  • Fondazione Filarete (IT)
  • University of Milan (IT)
  • Università di Camerino (IT)
  • ETH Zurich (CH)
Corresponding author
Grassi, Fabio
Venue
Immunity
Publisher
Elsevier BV
Published
2014-11
Volume
41
Issue
5
Pages
789-801
ISSN
1074-7613 (ISSN-L)
OpenAlex
W1996252358
Cited by
181
References
65
Citations by year
2026: 9 · 2025: 7 · 2024: 14 · 2023: 16 · 2022: 21 · 2021: 22 · 2020: 24 · 2019: 26 · 2018: 12 · 2017: 14 · 2016: 11 · 2015: 5
FWCI
7.56
Type
journal article
Language
en
Open access
Locations
  • Immunity (publishedVersion)
  • PubMed (publishedVersion)
  • BORIS (University Library Bern) (submittedVersion)
  • Unicam Scientific Publications (University of Camerino) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Adenosine and Purinergic Signaling
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
P2X7 receptor, T follicular helper cells, Peyer's patches, gut-associated lymphoid tissue, IgA, germinal center, mucosal colonization, IgM, polymicrobial sepsis, bacteremia, B-1 cells, commensal bacteria
MeSH terms
Adenosine Triphosphate, Animals, B-Lymphocytes, T-Lymphocytes, Helper-Inducer, Humans, Immunoglobulin A, Immunoglobulin M, Intestinal Mucosa, Lymphocyte Depletion, Mice, Inbred C57BL, Peyer's Patches, Symbiosis, Bacteremia, Mice, Knockout, Sepsis, Germinal Center, Genetic Predisposition to Disease, Mice, Receptors, Purinergic P2X7, Microbiota

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