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Maruyama H, Sakai S, Dewachter L, Dewachter C, Rondelet B, Naeije R, Ieda M. Endothelin-1 induces lysyl oxidase expression in pulmonary artery smooth muscle cells. Can J Physiol Pharmacol 2020; 98:629-636. [PMID: 32615041 DOI: 10.1139/cjpp-2019-0658] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The increase in thickening of the arterial wall of pulmonary arterial hypertension (PAH) includes cellular proliferation as well as matrix deposition and interrupted internal elastic lamina (IEL) consisting of a thick homogeneous sheet of elastin. Little is, although, known about the detail of IEL formation in PAH. Endothelin-1 is overexpressed in pulmonary arterioles of PAH. We aimed to examine the expression of genes contributing to IEL formation in pulmonary artery smooth muscle cells (PASMCs) especially focused on lysyl oxidase (LOx), an exreacellular matrix enzyme that catalyzes the cross-linking of collagens or elastin. We quantified mRNA expressions of genes contributing to IEL formation including LOx in PASMCs using real-time quantitative polymerase chain reaction. We stimulated human PASMCs with endothelin-1 with prostacyclin or trapidil. Endothelin-1 significantly increased LOx expression. Prostacyclin and trapidil restored endothelin-1-induced LOx expression to the basal level. Endothelin-1 increased LOx expression strongly in PASMCs from PAH patients compared to those from controls. Trapidil reduced LOx expression only in PASMCs from PAH patients. Overexpressed endothelin-1 in PAH patients can increase expression of LOx and agitate cross-linking of elastin and collagen, resulting in ectopic deposition of these in the vascular media.
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Affiliation(s)
- Hidekazu Maruyama
- Department of Cardiology, National Hospital Organization Kasumigaura Medical Center, Tsuchiura, Japan.,Faculty of Health Science, Tsukuba University of Technology, Tsukuba, Japan.,Division of Cardiovascular Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan.,Laboratory of Physiology and Pharmacology, Faculty of Medicine, Université Libre de Bruxelles, Brussels, Belgium
| | - Satoshi Sakai
- Faculty of Health Science, Tsukuba University of Technology, Tsukuba, Japan.,Division of Cardiovascular Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Laurence Dewachter
- Laboratory of Physiology and Pharmacology, Faculty of Medicine, Université Libre de Bruxelles, Brussels, Belgium
| | - Céline Dewachter
- Laboratory of Physiology and Pharmacology, Faculty of Medicine, Université Libre de Bruxelles, Brussels, Belgium.,Department of Cardiology, Erasme Academic Hospital, Brussels, Belgium
| | - Benoit Rondelet
- Department of Cardiac, Vascular and Thoracic Surgery, CHU UCL Namur, Yvoir, Belgium
| | - Robert Naeije
- Laboratory of Physiology and Pharmacology, Faculty of Medicine, Université Libre de Bruxelles, Brussels, Belgium
| | - Masaki Ieda
- Division of Cardiovascular Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
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