title: [Effects of urotensin II on cultured cardiac fibroblast proliferation and collagen type I mRNA expression].
abstract: OBJECTIVE
  To observe the effect of urotensin II on cultured cardiac fibroblast collagen type I mRNA expression and proliferation, thereby to explore the role of urotensin II in myocardial remodeling in the event of cardiac failure.
  
  
  METHODS
  Cardiac fibroblasts of neonatal Sprague-Dawley rats isolated by trypsin digestion method were stimulated by urotensin II at varied concentrations when the cells reached growth arrest. MTT assay was employed to measure the proliferation and determine the number of the cells, and reverse transcriptional (RT)-PCR used to detect the collagen mRNA expression.
  
  
  RESULTS
  With the increase of urotensin II concentration, the optical density at 570 nm of the fibroblasts as shown by MTT assay first increased but then decreased, and remained at a significantly higher level in the cells treated with 1x10(-8) or 1x10(-9) mol/L urotensin II as compared with the control (P<0.05). The collagen type I mRNA levels of the cells treated with 1x10(-7), 1x10(-8) or 1x10(-9) mol/L urotensin II were significantly higher than that of the control cells (P<0.01).
  
  
  CONCLUSIONS
  Urotensin II can directly induce cardiac fibroblast proliferation and significantly increase collagen type I mRNA expression, suggesting the crucial role of urotensin II in myocardial remodeling.
authors.affiliation: Department of Cardiology, Guangzhou Red-Cross Hospital/Fourth Affiliated Hospital of Jinan University, Guangzhou 510220, China. hyhdoctor0021@sina.com
authors.forename: Yan-hua
authors.initials: YH
authors.lastname: He
authors.forename: Jie-min
authors.initials: JM
authors.lastname: Hong
authors.forename: Heng-shan
authors.initials: HS
authors.lastname: Guo
authors.forename: Jian-rui
authors.initials: JR
authors.lastname: Wei
authors.forename: Hui
authors.initials: H
authors.lastname: Chen
authors.forename: Hui-hua
authors.initials: HH
authors.lastname: Zuo
authors.forename: Zhi-liang
authors.initials: ZL
authors.lastname: Li
mesh_terms: D000818:Animals; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D024042:Collagen Type I / Q000235:genetics*; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects; D032383:Myocytes, Cardiac / Q000166:cytology / Q000187:drug effects*; D012333:RNA, Messenger / Q000032:analysis*; D051381:Rats; D017207:Rats, Sprague-Dawley; D014579:Urotensins / Q000494:pharmacology*
chemical_list: D024042:Collagen Type I; D012333:RNA, Messenger; D014579:Urotensins; C029677:urotensin II