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BioMed Research International
Volume 2014, Article ID 231012, 9 pages
http://dx.doi.org/10.1155/2014/231012
Research Article

Histone Deacetylase Inhibitor Impairs Plasminogen Activator Inhibitor-1 Expression via Inhibiting TNF-α-Activated MAPK/AP-1 Signaling Cascade

1Graduate Institute of Medical Sciences and Department of Pharmacology, College of Medicine, Taipei Medical University, 250 Wu-Hsing Street, Taipei 110-31, Taiwan
2School of Respiratory Therapy, College of Medicine, Taipei Medical University, Taipei 110-31, Taiwan
3Division of Pulmonary Medicine, Department of Internal Medicine, Taipei Medical University Hospital, Taipei 110-31, Taiwan

Received 13 November 2013; Accepted 6 January 2014; Published 23 February 2014

Academic Editor: Philip Aloysius Thomas

Copyright © 2014 Wei-Lin Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Tumor necrosis factor-(TNF-)- upregulates plasminogen activator inhibitor-(PAI-) 1 expression in pleural mesothelial cells (PMCs), contributing to fibrin deposition and pleural fibrosis. Histone deacetylases (HDACs) have been found implicated in fibrogenesis. However, the roles of TNF- or HDAC in the regulation of PAI-1 expression have not been well investigated. We aimed to examine the effects and mechanisms of HDAC inhibition on TNF--induced PAI-1 expression in human PMCs. MeT-5A human PMCs were treated with TNF- in the presence or absence of the m-carboxycinnamic acid bishydroxamide (CBHA), an HDAC class II inhibitor, and the HDAC activity, PAI-1 protein expression, mRNA, and activated signalings were analyzed. CBHA abrogated TNF--induced HDAC activity, PAI-1 protein and, mRNA expression in MeT-5A cells. Moreover, CBHA significantly enhanced mitogen-activated protein kinase phosphatase-(MKP-) 5/MKP-1 expression and inhibited p38/JNK activations, ATF2/c-Jun translocation, and PAI-1 promoter activity. Altogether, our data suggest that HDAC inhibition may abrogate TNF--activated MAPK/AP-1 signaling and PAI-1 expression in human PMCs. Given the antifibrotic effect through PAI-1 abrogation, CBHA may be utilized as a novel agent in the treatment of fibrotic diseases.