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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 J+Thromb+Haemost
2017 ; 15
(8
): 1625-1639
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Myeloid but not epithelial tissue factor exerts protective anti-inflammatory
effects in acid aspiration-induced acute lung injury
#MMPMID28509332
Kral-Pointner JB
; Schrottmaier WC
; Horvath V
; Datler H
; Hell L
; Ay C
; Niederreiter B
; Jilma B
; Schmid JA
; Assinger A
; Mackman N
; Knapp S
; Schabbauer G
J Thromb Haemost
2017[Aug]; 15
(8
): 1625-1639
PMID28509332
show ga
Essentials Tissue factor (TF) represents a central link between hemostasis and
inflammation. We studied the roles of myeloid and airway epithelial TF in
acid-caused acute lung injury (ALI). TF on myeloid cells displays a
non-coagulatory role regulating the inflammatory response in ALI. Airway
epithelial TF contributes to hemostatic functions, but is dispensable in ALI
pathogenesis. SUMMARY: Introduction Acute lung injury (ALI) is a life-threatening
condition characterized by damaged alveolar-capillary structures and activation
of inflammatory and hemostatic processes. Tissue factor (TF) represents a crucial
link between inflammation and coagulation, as inflammatory mediators induce
myeloid TF expression, and TF initiates extrinsic coagulation. Objective As
pulmonary inflammation stimulates TF expression and TF modulates immune
responses, we aimed to elucidate its impact on ALI. In particular, we wanted to
distinguish the contributions of TF expressed on airway epithelial cells and TF
expressed on myeloid cells. Methods Mice with different cell type-specific TF
deficiency and wild-type littermates were intratracheally treated with
hydrochloric acid, and leukocyte recruitment, cytokine levels,
thrombin-antithrombin (TAT) complexes and pulmonary protein-rich infiltrates were
analyzed. Results Our data demonstrate that a lack of epithelial TF did not
influence acute responses, as bronchoalveolar neutrophil accumulation 8 h after
ALI induction was unaltered. However, it led to mild, prolonged inflammation, as
pulmonary leukocyte and erythrocyte numbers were still increased after 24 h,
whereas those in wild-type mice had returned to basal levels. In contrast,
myeloid TF was primarily involved in regulating the acute phase of ALI without
affecting local coagulation, as indicated by increased bronchoalveolar neutrophil
infiltration, pulmonary interleukin-6 levels, and edema formation, but equal TAT
complex formation, 8 h after ALI induction. This augmented inflammatory response
associated with myeloid TF deficiency was confirmed in vitro, as
lipopolysaccharide-stimulated TF-deficient alveolar macrophages released
increased levels of chemokine (C-X-C motif) ligand 1 and tumor necrosis factor-?
as compared with wild-type macrophages. Conclusion We conclude that myeloid TF
dampens inflammation in acid-induced ALI.
|*Hydrochloric Acid
[MESH]
|Acute Lung Injury/chemically induced/immunology/metabolism/*prevention & control
[MESH]