Neutrophil extracellular traps are pathogenic in primary graft dysfunction after lung transplantation.

Published

Journal Article

RATIONALE: Primary graft dysfunction (PGD) causes early mortality after lung transplantation and may contribute to late graft failure. No effective treatments exist. The pathogenesis of PGD is unclear, although both neutrophils and activated platelets have been implicated. We hypothesized that neutrophil extracellular traps (NETs) contribute to lung injury in PGD in a platelet-dependent manner. OBJECTIVES: To study NETs in experimental models of PGD and in lung transplant patients. METHODS: Two experimental murine PGD models were studied: hilar clamp and orthotopic lung transplantation after prolonged cold ischemia (OLT-PCI). NETs were assessed by immunofluorescence microscopy and ELISA. Platelet activation was inhibited with aspirin, and NETs were disrupted with DNaseI. NETs were also measured in bronchoalveolar lavage fluid and plasma from lung transplant patients with and without PGD. MEASUREMENTS AND MAIN RESULTS: NETs were increased after either hilar clamp or OLT-PCI compared with surgical control subjects. Activation and intrapulmonary accumulation of platelets were increased in OLT-PCI, and platelet inhibition reduced NETs and lung injury, and improved oxygenation. Disruption of NETs by intrabronchial administration of DNaseI also reduced lung injury and improved oxygenation. In bronchoalveolar lavage fluid from human lung transplant recipients, NETs were more abundant in patients with PGD. CONCLUSIONS: NETs accumulate in the lung in both experimental and clinical PGD. In experimental PGD, NET formation is platelet-dependent, and disruption of NETs with DNaseI reduces lung injury. These data are the first description of a pathogenic role for NETs in solid organ transplantation and suggest that NETs are a promising therapeutic target in PGD.

Full Text

Duke Authors

Cited Authors

  • Sayah, DM; Mallavia, B; Liu, F; Ortiz-Muñoz, G; Caudrillier, A; DerHovanessian, A; Ross, DJ; Lynch, JP; Saggar, R; Ardehali, A; Lung Transplant Outcomes Group Investigators, ; Ware, LB; Christie, JD; Belperio, JA; Looney, MR

Published Date

  • February 15, 2015

Published In

Volume / Issue

  • 191 / 4

Start / End Page

  • 455 - 463

PubMed ID

  • 25485813

Pubmed Central ID

  • 25485813

Electronic International Standard Serial Number (EISSN)

  • 1535-4970

Digital Object Identifier (DOI)

  • 10.1164/rccm.201406-1086OC

Language

  • eng

Conference Location

  • United States