Suppression of plasminogen activator inhibitor-1 by RNA interference attenuates pulmonary fibrosis
Thorax Volume 65 Issue 4
Page 334-340
published_at 2010
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Title ( eng ) |
Suppression of plasminogen activator inhibitor-1 by RNA interference attenuates pulmonary fibrosis
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Creator |
Hattori Noboru
Tanimoto Takuya
Furonaka Makoto
Ishikawa Nobuhisa
Yokoyama Akihito
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Source Title |
Thorax
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Volume | 65 |
Issue | 4 |
Start Page | 334 |
End Page | 340 |
Abstract |
Background and aim: There is a growing body of evidence demonstrating that plasminogen activator inhibitor-1 (PAI-1) is involved in the progression of pulmonary fibrosis. In fact, PAI-1 knockout mice are protected from bleomycin-induced pulmonary fibrosis. This study was conducted to determine whether the intrapulmonary administration of small interfering RNA (siRNA) targeting PAI-1 (PAI-1-siRNA) limits the development of bleomycin-induced pulmonary fibrosis.
Methods: Lung biopsies from patients with idiopathic pulmonary fibrosis (IPF) were stained for PAI-1. The distribution of siRNA in the lung, the PAI-1 level in bronchoalveolar (BAL) fluid and the extent of fibrotic changes in the lung were evaluated following the intranasal administration of PAI-1-siRNA in a mouse model of bleomycin-induced pulmonary fibrosis. The effect of PAI-1-siRNA on the epithelial to mesenchymal transition (EMT) was also evaluated using a mouse lung epithelial cell line, LA-4. Results: PAI-1 was overexpressed in the hyperplastic type 2 pneumocytes lining the honeycomb lesions of patients with IPF. The single intranasal instillation of PAI-1-siRNA resulted in the diffuse uptake of siRNA into the epithelial cells lining the dense fibrotic lesions. The repeated administration of PAI-1-siRNA initiated during either the inflammatory or the fibrotic phase into bleomycin-injured mice reduced the PAI-1 level in BAL fluid and limited the accumulation of collagen in the lungs. EMT induced by transforming growth factor β (TGFβ) in LA-4 cells was inhibited by transfection with PAI-1-siRNA. Conclusions: The direct suppression of PAI-1 in the lung by the intrapulmonary administration of PAI-1-siRNA attenuated the development and progression of pulmonary fibrosis. The inhibition of EMT may be, at least in part, involved in this effect. |
NDC |
Medical sciences [ 490 ]
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Language |
eng
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Resource Type | journal article |
Publisher |
BMJ Publishing Group
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Date of Issued | 2010 |
Rights |
Copyright (c) 2010 BMJ Publishing Group & British Thoracic Society
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Publish Type | Version of Record |
Access Rights | open access |
Source Identifier |
[ISSN] 0040-6376
[DOI] 10.1136/thx.2009.119974
[NCID] AA00863090
[DOI] http://dx.doi.org/10.1136/thx.2009.119974
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