title: Effects of specific endothelin-1 receptor antagonists on proliferation and fibronectin production of glomerular mesangial cells stimulated with Angiotensin II.
abstract: Angiotensin II (Ang-II) is a potent vasoactive hormone, which plays an important role in the pathogenesis of glomerulosclerosis. Ang-II activates many cytokine systems in the kidney. Recent studies indicate that Ang-II is closely related to the activation of the endothelin-1 (ET-1) system. The present study was designed to measure the [H3]-thymidine uptake and fibronectin production of cultured rat mesangial cells stimulated with Ang-II, and to evaluate the effects of specific ET-1 receptor antagonists, BQ123 (type A receptor antagonist) and IRL1038 (type B receptor antagonist) on the cells. ET-1 was measured by radioimmunoassay and fibronectin by Western blot analysis. The results were as follows: (1) Ang-II enhanced ET-1 production, [H3]-thymidine uptake, number of cells, and fibronectin production of mesangial cells; (2) all the baseline [H3]-thymidine uptake, number of cells, and fibronectin production of mesangial cells can be partly suppressed by BQ123, but not by IRL1038; (3) the increment of Ang-II-enhanced number of cells can be partly suppressed by BQ123, but not by IRL1038; and (4) the increment of Ang-II-enhanced fibronectin production can be partly suppressed by both BQ123 and IRL1038. Our results indicate that Ang-II is an active stimulant for the proliferation and fibronectin production of mesangial cells, and the effect is partly suppressed mainly by ET-1 type A receptor antagonists.
authors.affiliation: Division of Nephrology, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
authors.forename: Hung-Tien
authors.initials: HT
authors.lastname: Kuo
authors.forename: Shyi-Jang
authors.initials: SJ
authors.lastname: Shin
authors.forename: Mei-Chuan
authors.initials: MC
authors.lastname: Kuo
authors.forename: Hung-Chun
authors.initials: HC
authors.lastname: Chen
mesh_terms: D000804:Angiotensin II / Q000494:pharmacology*; D000818:Animals; D049109:Cell Proliferation / Q000187:drug effects; D065130:Endothelin A Receptor Antagonists; D019332:Endothelin-1 / Q000096:biosynthesis; D016232:Endothelins / Q000494:pharmacology; D005353:Fibronectins / Q000096:biosynthesis*; D005920:Glomerular Mesangium / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D010446:Peptide Fragments / Q000494:pharmacology; D010456:Peptides, Cyclic / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D065130:Endothelin A Receptor Antagonists; D019332:Endothelin-1; D016232:Endothelins; D005353:Fibronectins; D010446:Peptide Fragments; D010456:Peptides, Cyclic; D000804:Angiotensin II; C077420:Cys(11)-Cys(15)-endothelin-1 (11-21); C072247:cyclo(Trp-Asp-Pro-Val-Leu)