Cited by 397Adenosine and Purinergic SignalingInterstitial Lung Diseases and Idiopathic Pulmonary FibrosisTransplantation: Methods and Outcomes

Extracellular ATP Is a Danger Signal Activating P2X7 Receptor in Lung Inflammation and Fibrosis

Riteau, Nicolas, Gasse, Pamela, Fauconnier, Louis, Gombault, Aurélie, Couegnat, Marion, Fick, Lizette, Kanellopoulos, Jean, Quesniaux, Valérie F. J. +4 more·2010·American Journal of Respiratory and Critical Care Medicine

Abstract

Rationale: Pulmonary fibrosis is a devastating as yet untreatable disease. We previously investigated the endogenous mediators released on lung injury and showed that uric acid is a danger signal activating Nod-like receptor family, pyrin domain containing 3 (NLRP3) inflammasome in lung inflammation and fibrosis (Gasse et al., Am J Respir Crit Care Med 2009;179:903–913). Objectives: Here we address the role of extracellular adenosine triphosphate (eATP) in pulmonary inflammation and fibrosis. Methods: ATP was quantified in bronchoalveolar lavage fluid (BALF) of control subjects and patients with idiopathic pulmonary fibrosis. The contribution of eATP as a danger signal was assessed in a murine model of lung fibrosis induced by airway-administered bleomycin (BLM), an intercalating agent that causes DNA strand breaks. Measurements and Main Results: Fibrotic patients have elevated ATP content in BALF in comparison with control individuals. In mice, we report an early increase in eATP levels in BALF on BLM administration. Modulation of eATP levels with the ATP-degrading enzyme apyrase greatly reduced BLM-induced inflammatory cell recruitment, lung IL-1β, and tissue inhibitor of metalloproteinase (TIMP)-1 production, while administration of ATP-γS, a stable ATP derivative, enhanced inflammation. P2X7 receptor–deficient mice presented dramatically reduced lung inflammation, with reduced fibrosis markers such as lung collagen content and matrix-remodeling proteins TIMP-1 and matrix metalloproteinase-9. The acute inflammation depends on a functional pannexin-1 hemichannel protein. In vitro, ATP is released by pulmonary epithelial cells on BLM-induced stress and this is partly dependent on the presence of functional P2X7 receptor and pannexin-1 hemichannel. Conclusions: ATP released from BLM-injured lung cells constitutes a major endogenous danger signal that engages the P2X7 receptor/pannexin-1 axis, leading to IL-1β maturation and lung fibrosis.

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Crossref · 10.1164/rccm.201003-0359oc

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  • P2X7 receptor expression deletion appears to be beneficial in acute lung injury, asthma, lung inflammation, and fibrosis.

    “In addition, P2X7 receptor expression deletion appears to be beneficial in case of acute lung injury, asthma, lung inflammation, and fibrosis [87–91].”
  • Inhibition of the P2X7 receptor might decrease pathological traits mediated by the RAAS pressor axis and protect against brain and lung injury in COVID-19 patients.

    “Since the P2X7 receptor is also involved in lung damage [87–89], neurodegenerative and psychiatric disorders [92, 95, 118], the hypothesis is reasonable that inhibition of this receptor might decrease pathological traits mediated by the RAAS pressor axis and protect against brain and lung injury in COVID-19 patients.”

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Authors
Riteau, N., Gasse, P., Fauconnier, L., Gombault, A., Couegnat, M., Fick, L., Kanellopoulos, J., Quesniaux, V. F. J., Marchand-Adam, S., Crestani, B., Ryffel, B., & Couillin, I.
Affiliations
  • Université d'Orléans (FR)
  • University of Orleans and National Center for Scientific Research UMR6218, Molecular Immunology and Embryology, Orleans, France
  • University of Cape Town (ZA)
  • Centre National de la Recherche Scientifique (FR)
  • Université de Tours (FR)
  • Inserm (FR)
Venue
American Journal of Respiratory and Critical Care Medicine
Published
2010-09
Volume
182
Issue
6
Pages
774-783
ISSN
  • 1073-449X (ISSN-L)
  • 1535-4970
OpenAlex
W2167645193
Cited by
397
References
48
Citations by year
2026: 8 · 2025: 20 · 2024: 16 · 2023: 29 · 2022: 19 · 2021: 28 · 2020: 26 · 2019: 17 · 2018: 40 · 2017: 30 · 2016: 32 · 2015: 24 · 2014: 33 · 2013: 29 · 2012: 24
FWCI
16.15
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Respiratory and Critical Care Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Adenosine and Purinergic Signaling
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Interstitial Lung Diseases and Idiopathic Pulmonary Fibrosis
  • Health Sciences › Medicine › Surgery › Transplantation: Methods and Outcomes
Keywords
extracellular ATP, P2X7 receptor, pulmonary fibrosis, lung inflammation, damage-associated molecular patterns, bleomycin-induced lung injury, IL-1β, TIMP-1, MMP-9, apyrase, bronchoalveolar lavage fluid, lung epithelial cells, extracellular nucleotides
MeSH terms
Adenosine Triphosphate, Animals, Bleomycin, Bronchoalveolar Lavage Fluid, Disease Models, Animal, Humans, Mice, Inbred C57BL, Pneumonia, Pulmonary Fibrosis, Signal Transduction, Case-Control Studies, Receptors, Purinergic P2, Mice, Lung Injury, Receptors, Purinergic P2X7

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