Aarhus University Seal

Bestrophin-3 associated Ca2+-activated Cl- conductance is important for synchronization in the arterial wall

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperConference abstract in journalResearch

  • Department of Physiology and Biophysics

The cGMP-dependent Ca2+-activated Cl- current (IcGMP,Ca-Cl) has been previously suggested to be important for synchronization of smooth muscle cells (SMCs) in the vascular wall (Peng et al., Circ Res, 2001). We have characterized this current and we have shown its association with a member of bestrophin proteins family - Best-3. We have aimed here to explore the importance of Best-3 for vascular wall function.


Segments of the mesenteric small arteries were transfected in vivo in anaesthetized rats with siRNA against Best-3 and siRNA with mismatching nucleotides (mutated siRNA) as a control. The efficiency of transfection at molecular level was evaluated 3 days after transfection. Contractility, vasomotion and [Ca2+]i dynamic were tested in isometric myograph and using confocal microscope.


The specific Best-3 siRNA significantly reduced Best-3 expression in comparison to the control. Arteries from different groups were similar morphologically and no difference in contractility was seen. The arteries downregulated for Best-3 had significantly reduced amplitude of vasomotion without changes in the frequency. Endothelium denudation abolished vasomotion in both groups. Addition of 8Br-cGMP to the endothelium-denuded vessels restored vasomotion but did not change the difference between groups. SMCs in control endothelium-intact arteries were completely synchronized whereas in the siRNA-transfected arteries only partial synchronization was observed.


Our data suggest that the Best-3-associated IcGMP,Ca-Cl is important for the synchronization of SMCs and the generation of vasomotion.

Original languageEnglish
Number of pages1
Publication statusPublished - 2009
EventEuropean Council for Cardiovascular Research (ECCR) - Nice, France
Duration: 9 Oct 200911 Oct 2009
Conference number: 14


ConferenceEuropean Council for Cardiovascular Research (ECCR)

See relations at Aarhus University Citationformats

ID: 16602595