Wnt3a mitigates acute lung injury by reducing P2X7 receptor-mediated alveolar epithelial type I cell death.

Abstract:

:Acute lung injury (ALI) is characterized by pulmonary endothelial and epithelial cell damage, and loss of the alveolar-capillary barrier. We have previously shown that P2X7 receptor (P2X7R), a cell death receptor, is specifically expressed in alveolar epithelial type I cells (AEC I). In this study, we hypothesized that P2X7R-mediated purinergic signaling and its interaction with Wnt/β-catenin signaling contributes to AEC I death. We examined the effect of P2X7R agonist 2'-3'-O-(4-benzoylbenzoyl)-ATP (BzATP) and Wnt agonist Wnt3a on AEC I death in vitro and in vivo. We also assessed the therapeutic potential of Wnt3a in a clinically relevant ALI model of intratracheal lipopolysaccharide (LPS) exposure in ventilated mice. We found that the activation of P2X7R by BzATP caused the death of AEC I by suppressing Wnt/β-catenin signaling through stimulating glycogen synthase kinase-3β (GSK-3β) and proteasome. On the other hand, the activation of Wnt/β-catenin signaling by Wnt3a, GSK-3β inhibitor, or proteasome inhibitor blocked the P2X7R-mediated cell death. More importantly, Wnt3a attenuated the AEC I damage caused by intratracheal instillation of BzATP in rats or LPS in ventilated mice. Our results suggest that Wnt3a overrides the effect of P2X7R on the Wnt/β-catenin signaling to prevent the AEC I death and restrict the severity of ALI.

journal_name

Cell Death Dis

journal_title

Cell death & disease

authors

Guo Y,Mishra A,Weng T,Chintagari NR,Wang Y,Zhao C,Huang C,Liu L

doi

10.1038/cddis.2014.254

subject

Has Abstract

pub_date

2014-06-12 00:00:00

pages

e1286

issn

2041-4889

pii

cddis2014254

journal_volume

5

pub_type

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