The role of transglutaminase-2 in fibroproliferation after lipopolysaccharide-induced acute lung injury
- Authors
- Kim, J.H.
- Issue Date
- 2010
- Keywords
- Acute lung injury; Fibrosis; Inflammation; Lipopolysaccharides
- Citation
- Tuberculosis and Respiratory Diseases, v.69, no.5, pp.337 - 347
- Indexed
- SCOPUS
KCI
- Journal Title
- Tuberculosis and Respiratory Diseases
- Volume
- 69
- Number
- 5
- Start Page
- 337
- End Page
- 347
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/118254
- DOI
- 10.4046/trd.2010.69.5.337
- ISSN
- 1738-3536
- Abstract
- Background: Transglutaminase-2 (TG-2) has been reported to play an important role in the process of fibrosis. However, TG-2 studies on fibroproliferation of acute lung injury (ALI) are absent. The purpose of this study was to investigate the role of TG-2 in the fibroproliferation of lipopolysaccharide (LPS)-induced ALI. Methods: The male C57BL/6 mice of 5 weeks age were divided into 3 groups; control group (n=30) in which 50 μL of saline was given intratracheally (IT), LPS group (n=30) in which LPS 0.5 mg/kg/50 μL of saline was given IT, and LPS+Cyst group treated with intraperitoneal 200 mg/kg of cystamine, competitive inhibitor of TG-2, after induction of ALI by LPS. TG-2 activity and nuclear factor (NF)-κB were measured in lung tissue homogenate. Tumor necrosis factor (TNF)-α, interleukin (IL)-1β, IL-6, myeloperoxidase (MPO), and transforming growth factor (TGF)-β1 were measured using bronchoalveolar lavage fluids. Histopathologic ALI score and Mallory's phosphotunisticacid hematoxylin (PTAH) for collagen and fibronectin deposition were performed.Results: The TG-2 activities in the LPS group were significantly higher than the control and LPS+Cyst groups(p<0.05). The TNF-α and IL-1β concentrations and NF-κB activity were lower in the LPS+Cyst group than theLPS group (p<0.05). The LPS+Cyst group showed lower MPO, ALI score, TGF-β1 concentration, and Mallory'sPTAH stain than the LPS group, but the differences were not significant (p>0.05).Conclusion: Inhibition of TG-2 activity in the LPS-induced ALI prevented early inflammatory parameters, but hadlimited effects on late ALI and fibroproliferative parameters. Copyright©2010. The Korean Academy of Tuberculosis and Respiratory Diseases. All rights reserved.
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