Inhibition of p38 MAPK Mitigates Lung Ischemia Reperfusion Injury by Reducing Blood-Air Barrier Hyperpermeability.

Abstract:

:Background: Lung ischemia reperfusion injury (LIRI) is a complex pathophysiological process activated by lung transplantation and acute lung injury. The p38 mitogen-activated protein kinase (MAPK) is involved in breakdown of the endothelial barrier during LIRI, but the mechanism is still unclear. Therefore, we investigated the function of p38 MAPK in LIRI in vivo and in vitro. Methods: Sprague-Dawley rats were subjected to ischemia reperfusion with or without pretreatment with a p38 MAPK inhibitor. Lung injury was assessed using hematoxylin and eosin staining, and pulmonary blood-air barrier permeability was evaluated using Evans blue staining. A rat pulmonary microvascular endothelial cell line was infected with lentiviral expressing short hairpin (sh)RNA targeting p38 MAPK and then cells were subjected to oxygen/glucose deprivation and reoxygenation (OGD/R). Markers of endothelial destruction were measured by western blot and immunofluorescence. Results:In vivo LIRI models showed structural changes indicative of lung injury and hyperpermeability of the blood-air barrier. Inhibiting p38 MAPK mitigated these effects. Oxygen/glucose deprivation and reoxygenation promoted hyperpermeability of the endothelial barrier in vitro, but knockdown of p38 MAPK attenuated cell injury; maintained endothelial barrier integrity; and partially reversed injury-induced downregulation of permeability protein AQP1, endothelial protective protein eNOS, and junction proteins ZO-1 and VE-cadherin while downregulating ICAM-1, a protein involved in destroying the endothelial barrier, and ET-1, a protein involved in endothelial dysfunction. Conclusion: Inhibition of p38 MAPK alleviates LIRI by decreasing blood-air hyperpermeability. Blocking p38 MAPK may be an effective treatment against acute lung injury.

journal_name

Front Pharmacol

authors

Wang T,Liu C,Pan LH,Liu Z,Li CL,Lin JY,He Y,Xiao JY,Wu S,Qin Y,Li Z,Lin F

doi

10.3389/fphar.2020.569251

subject

Has Abstract

pub_date

2020-12-11 00:00:00

pages

569251

issn

1663-9812

pii

569251

journal_volume

11

pub_type

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