Universität zu Köln

Lau, Denise, Szoecs, Katalin, Klinke, Anna, Rudolph, Tanja, Rudolph, Volker, Streichert, Thomas, Blankenberg, Stefan and Baldus, Stephan (2014). Myeloperoxidase upregulates endothelin receptor type B expression. J. Mol. Cell. Cardiol., 69. S. 76 - 83. OXFORD: ELSEVIER SCI LTD. ISSN 1095-8584

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Abstract

Neutrophil recruitment and activation are principal events in inflammation. Upon activation neutrophils release myeloperoxidase (MPO), a heme enzyme, which binds to and transcytoses endothelial cells. Whereas the significance of the subendothelial deposition of MPO has evolved as a critical prerequisite for the enzyme's suppression of nitric oxide (NO center dot) bioavailability, the functional consequences of MPO binding to and interaction with endothelial and smooth muscle cells remain poorly understood. Cultured human endothelial cells (HUVECs) were exposed to MPO. Gene expression of the endothelin receptor type B (ETRB), which is critically involved not only in endothelin-1 clearance, but also in endothelin-mediated vasoconstriction, was significantly increased. Real time PCR, Western blotting and immunofluorescence confirmed up-regulation of ETRB in MPO-treated endothelial cells. Inhibition of MPO's enzymatic activity blunted the increase in ETRB protein expression. Treatment of the cells with the MAP kinase inhibitors PD98059 or SB203580 indicates that MPO activates ETRB expression via MAP kinase pathways. On human smooth muscle cells (HAoSMCs), which not only express the endothelin receptor type B (ETRB) but also express the endothelin receptor type A (ETRA), MPO also stimulated ETRB expression as opposed to ETRA expression, which remained unchanged. Functional ex vivo organ bath chamber studies with MPO-incubated rat femoral artery sections revealed increased ETRB agonist dependent constriction. Binding of MPO to endothelial and vascular smooth muscle cells increases expression of the endothelin receptor type B (ETRB) via classical MAP kinase pathways. This suggests that MPO not only affects vasomotion by reducing the bioavailability of vasodilating molecules but also by increasing responsiveness to vasoconstrictors, further advocating for MPO as a central, leukocyte-derived regulator of vascular tone. (C) 2013 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lau, Denise UNSPECIFIED UNSPECIFIED UNSPECIFIED Szoecs, Katalin UNSPECIFIED UNSPECIFIED UNSPECIFIED Klinke, Anna UNSPECIFIED UNSPECIFIED UNSPECIFIED Rudolph, Tanja UNSPECIFIED UNSPECIFIED UNSPECIFIED Rudolph, Volker UNSPECIFIED UNSPECIFIED UNSPECIFIED Streichert, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Blankenberg, Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED Baldus, Stephan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-441116
DOI:	10.1016/j.yjmcc.2013.12.007
Journal or Publication Title:	J. Mol. Cell. Cardiol.
Volume:	69
Page Range:	S. 76 - 83
Date:	2014
Publisher:	ELSEVIER SCI LTD
Place of Publication:	OXFORD
ISSN:	1095-8584
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HYPOCHLOROUS ACID; PROTEIN-KINASES; ETB RECEPTORS; ACTIVATION; RISK; NEUTROPHILS; DYSFUNCTION; MECHANISM; SYNTHASE; STRESS Multiple languages Cardiac & Cardiovascular Systems; Cell Biology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44111