Abstract
Objective
Long pentraxin PTX3 is an inflammatory mediator and a component of the humoral arm of innate immunity. PTX3 expression is increased in animals with acute lung injury (ALI) and in patients with sepsis or acute respiratory distress syndrome and is considered to be a potential biomarker for these diseases. However, the role of PTX3 in the pathogenesis of ALI is not fully understood. We hypothesized that PTX3, as an important immune modulator, may determine the severity of ALI.
Methods
Lipopolysaccharide (LPS) was intra-tracheally administrated to PTX3 knock-out (PTX3-KO) and wild-type (WT) mice. Lung injury, neutrophil infiltration, cell death, fibrin deposition, and tissue factor expression in the lung were determined. Local and systemic inflammatory responses were assessed by measuring cytokines in the lung and plasma.
Results
LPS instillation induced ALI in both PTX3-KO and WT mice. Interestingly, PTX3 deficiency significantly increased the magnitude/extent of lung injury compared to that in WT mice. The severe lung injury was accompanied by elevated neutrophil infiltration, cell death, and fibrin deposition in the lung. PTX3 deficiency also enhanced LPS-induced tissue factor expression/activation in the lung and increased tumor necrosis factor-alpha and monocyte chemoattractant protein-1 levels in the plasma.
Conclusion
Our data suggest that the endogenously expressed PTX3 plays a protective role in the pathogenesis of ALI and that a lack of PTX3 may enhance neutrophil recruitment, cell death, activation of coagulation cascades, and inflammatory responses in the lung.
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Acknowledgments
We thank Ms. Zhihong Yun for technical assistance, Dr. Martin M. Matzuk (Baylor College of Medicine, Houston) for the ptx3+/− mice, and Dr. J. H. Morrissey (University of Illinois at Urbana-Champaign) for the anti-TF antibody. This work is supported by the Canadian Institutes of Health Research (operating grants: MOP-13270 and MOP-42546).
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The authors have no financial conflict of interest.
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Han, B., Haitsma, J.J., Zhang, Y. et al. Long pentraxin PTX3 deficiency worsens LPS-induced acute lung injury. Intensive Care Med 37, 334–342 (2011). https://doi.org/10.1007/s00134-010-2067-2
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DOI: https://doi.org/10.1007/s00134-010-2067-2