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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Respir+Cell+Mol+Biol
2015 ; 53
(5
): 719-27
Nephropedia Template TP
gab.com Text
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English Wikipedia
Regulation of alveolar procoagulant activity and permeability in direct acute
lung injury by lung epithelial tissue factor
#MMPMID25884207
Shaver CM
; Grove BS
; Putz ND
; Clune JK
; Lawson WE
; Carnahan RH
; Mackman N
; Ware LB
; Bastarache JA
Am J Respir Cell Mol Biol
2015[Nov]; 53
(5
): 719-27
PMID25884207
show ga
Tissue factor (TF) initiates the extrinsic coagulation cascade in response to
tissue injury, leading to local fibrin deposition. Low levels of TF in mice are
associated with increased severity of acute lung injury (ALI) after intratracheal
LPS administration. However, the cellular sources of the TF required for
protection from LPS-induced ALI remain unknown. In the current study, transgenic
mice with cell-specific deletions of TF in the lung epithelium or myeloid cells
were treated with intratracheal LPS to determine the cellular sources of TF
important in direct ALI. Cell-specific deletion of TF in the lung epithelium
reduced total lung TF expression to 39% of wild-type (WT) levels at baseline and
to 29% of WT levels after intratracheal LPS. In contrast, there was no reduction
of TF with myeloid cell TF deletion. Mice lacking myeloid cell TF did not differ
from WT mice in coagulation, inflammation, permeability, or hemorrhage. However,
mice lacking lung epithelial TF had increased tissue injury, impaired activation
of coagulation in the airspace, disrupted alveolar permeability, and increased
alveolar hemorrhage after intratracheal LPS. Deletion of epithelial TF did not
affect alveolar permeability in an indirect model of ALI caused by systemic LPS
infusion. These studies demonstrate that the lung epithelium is the primary
source of TF in the lung, contributing 60-70% of total lung TF, and that lung
epithelial, but not myeloid, TF may be protective in direct ALI.