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Up-regulation of endothelin receptor function and mRNA expression in airway smooth muscle cells following Sephadex-induced airway inflammation.

Abstract
The hypothesis that up-regulation of bronchial constrictor endothelin receptors in airway smooth muscle cells may contribute to hyperreactivity during airway inflammation was tested in the present study by quantitative endothelin receptor mRNA analysis and functional responses in ring segments of rat trachea and bronchi. Real time reverse transcription polymerase chain reaction was used to quantify endothelin receptor expression in rat airway smooth muscle cells following Sephadex-induced inflammation. Compared with controls, Sephadex-induced airway inflammation caused a significant increase (3.9 times P<0.05) of endothelin receptor type B mRNA expression in bronchial smooth muscle cells, but not in tracheal smooth muscle cells. Functional myograph studies of bronchial and tracheal ring segments without epithelium (mechanically denuded) revealed an increase of the maximum contractile effects of endothelin-1 (a dual agonist for both endothelin type A and B receptors) and sarafotoxin 6c (a selective agonist for endothelin B receptors) in bronchial smooth muscle cells in Sephadex-induced inflammation, but not in tracheal smooth muscle cells. The enhanced maximal responses of bronchial smooth muscle cells to endothelin-1 and sarafotoxin 6c in Sephadex-induced inflammation support our molecular findings and hence imply a role for endothelin B receptors in airway hyperreactivity during airway inflammation.
AuthorsBengt W Granström, Cang-Bao Xu, Elisabet Nilsson, Ursula Hultkvist Bengtsson, Lars Edvinsson
JournalBasic & clinical pharmacology & toxicology (Basic Clin Pharmacol Toxicol) Vol. 95 Issue 1 Pg. 43-8 (Jul 2004) ISSN: 1742-7835 [Print] Denmark
PMID15245576 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Endothelin-1
  • RNA, Messenger
  • Receptor, Endothelin A
  • Receptor, Endothelin B
  • Viper Venoms
  • sarafotoxins s6
  • sephadex
  • Dextrans
Topics
  • Animals
  • Bronchi (cytology, drug effects, metabolism)
  • Dextrans
  • Endothelin-1 (pharmacology)
  • In Vitro Techniques
  • Inflammation (chemically induced, metabolism)
  • Male
  • Myocytes, Smooth Muscle (drug effects, metabolism)
  • RNA, Messenger (biosynthesis)
  • Rats
  • Rats, Sprague-Dawley
  • Receptor, Endothelin A (biosynthesis, genetics)
  • Receptor, Endothelin B (biosynthesis, genetics)
  • Reverse Transcriptase Polymerase Chain Reaction
  • Trachea (cytology, drug effects, metabolism)
  • Up-Regulation
  • Viper Venoms (pharmacology)

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