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BESTROPHIN IS IMPORTANT FOR THE RHYTHMIC BUT NOT THE TONIC CONTRACTION IN RAT MESENTERIC SMALL ARTERIES.
MedLine Citation:
PMID:  21498420     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Aims We have previously characterized a cGMP-dependent Ca(2+)-activated Cl(-) current in vascular smooth muscle cells (SMCs) and have shown its dependence on bestrophin-3 expression. We hypothesized the importance of this current for synchronization of SMCs in the vascular wall. In the present study we aimed to test this hypothesis by transfecting rat mesenteric small arteries in vivo with siRNA specifically targeting bestrophin-3. Methods and Results The arteries were tested 3 days after transfection in vitro for isometric force development and for intracellular Ca(2+) in SMCs. Bestrophin-3 expression was significantly reduced compared to arteries transfected with mutated siRNA. mRNA levels for bestrophin-1 and -2 were also significantly reduced by bestrophin-3 downregulation. This is suggested to be secondary to specific bestrophin-3 downregulation since siRNAs targeting different exons of the bestrophin-3 gene had identical effects on bestrophin-1 and -2 expression. The transfection did not affect either maximal contractile response or sensitivity to norepinephrine and arginine-vasopressin. The amplitude of agonist-induced vasomotion was significantly reduced in arteries downregulated for bestrophins compared to controls, and asynchronous Ca(2+) waves appeared in the SMCs. The average frequency of vasomotion was not different. 8Br-cGMP restored vasomotion in arteries where the endothelium was removed, but oscillation amplitude was still significantly less in bestrophin-downregulated arteries. Thus, vasomotion properties were consistent with those previously characterized for rat mesenteric small arteries. Data from our mathematical model are consistent with the experimental results. Conclusion This study demonstrates the importance of bestrophins for synchronization of SMCs and strongly supports our hypothesis for generation of vasomotion.
Authors:
Torbjoern Broegger; Jens Christian Brings Jacobsen; Vibeke Secher Dam; Donna M Briggs Boedtkjer; Henrik Kold-Petersen; Finn Skou Pedersen; Christian Aalkjaer; Vladimir V Matchkov
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-14
Journal Detail:
Title:  Cardiovascular research     Volume:  -     ISSN:  1755-3245     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-4-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0077427     Medline TA:  Cardiovasc Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Physiology and Biophysics, Aarhus University, Denmark.
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