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Role of transient receptor potential vanilloid 4 in the effect of osmotic pressure on myocardial contractility in rat.
MedLine Citation:
PMID:  18425304     Owner:  NLM     Status:  In-Data-Review    
The aim of the present study was to investigate the influence of osmotic pressure on myocardial contractility and the possible mechanism. Electrical stimulation was used to excite papillary muscles of the left ventricle of Sprague-Dawley (SD) rats. The contractilities of myocardium in hyposmotic, isosmotic, and hyperosmotic perfusates were recorded. The influences of agonist and antagonist of the transient receptor potential vanilloid 4 (TRPV4) on the contractility of myocardium under hyposmotic, isosmotic and hyperosmotic conditions were observed. The results were as follows: (1) Compared with that under isosmotic condition (310 mOsm/L), the myocardial contractility was increased by 11.5%, 21.5% and 25.0% (P<0.05) under hyposmotic conditions when the osmotic pressure was at 290, 270 and 230 mOsm/L, respectively; and was decreased by 16.0%, 23.7% and 55.2% (P<0.05) under hyperosmotic conditions when the osmotic pressure was at 350, 370 and 390 mOsm/L, respectively. (2) When ruthenium red (RR), an antagonist of TRPV4, was added to the hyposmotic perfusate (270 mOsm/L), the positive inotropic effect of hyposmia was restrained by 36% (P<0.01); and when RR was added to the hyperosmotic perfusate (390 mOsm/L), the inhibitory effect of hyperosmia on myocardial contractility was increased by 56.1% (P<0.01). (3) When 4-α-phorbol-12,13-didecanoate (4α-PDD), an agonist of TRPV4, was added to the isosmotic perfusate (310 mOsm/L), the myocardial contractility did not change; and when 4α-PDD was added to the hyperosmotic perfusate (390 mOsm/L), the inhibition of myocardial contractility by hyperosmia was increased by 27.1% (P<0.01). These results obtained indicate that TRPV4 is possibly involved in the osmotic pressure-induced inotropic effect.
Jing Li; Ming-Huan Wang; Le Wang; Yang Tian; Ya-Qi Duan; Hong-Yan Luo; Xin-Wu Hu; Jüergen Hescheler; Ming Tang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Sheng li xue bao : [Acta physiologica Sinica]     Volume:  60     ISSN:  0371-0874     ISO Abbreviation:  Sheng Li Xue Bao     Publication Date:  2008 Apr 
Date Detail:
Created Date:  2008-04-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  20730130R     Medline TA:  Sheng Li Xue Bao     Country:  China    
Other Details:
Languages:  eng     Pagination:  181-8     Citation Subset:  IM    
Department of Physiology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
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