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Related Experiment Video

Updated: May 22, 2026

Simultaneous Measurements of Intracellular Calcium and Membrane Potential in Freshly Isolated and Intact Mouse Cerebral Endothelium
09:45

Simultaneous Measurements of Intracellular Calcium and Membrane Potential in Freshly Isolated and Intact Mouse Cerebral Endothelium

Published on: January 20, 2019

Elementary Ca2+ signals through endothelial TRPV4 channels regulate vascular function.

Swapnil K Sonkusare1, Adrian D Bonev, Jonathan Ledoux

  • 1Department of Pharmacology, College of Medicine, University of Vermont, Burlington, VT 05405, USA.

Science (New York, N.Y.)
|May 5, 2012
PubMed
Summary
This summary is machine-generated.

Researchers discovered that localized calcium signals, or sparklets, in blood vessels are key to regulating vascular smooth muscle tone. These signals, mediated by TRPV4 channels, activate potassium channels, leading to vasodilation and blood flow regulation.

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09:23

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Published on: November 25, 2013

Area of Science:

  • Physiology
  • Molecular Biology
  • Cardiovascular Research

Background:

  • Endothelium-dependent regulation of vascular smooth muscle tone is crucial for cardiovascular health.
  • The precise transcellular signaling mechanisms involved remain incompletely understood.

Purpose of the Study:

  • To elucidate the role of local calcium signals in the endothelium.
  • To identify the specific ion channels involved in endothelium-dependent vasodilation.

Main Methods:

  • Utilized advanced microscopy to observe local calcium signals (sparklets) in the vascular endothelium of resistance arteries.
  • Investigated the function of transient receptor potential vanilloid 4 (TRPV4) cation channels and their role in channel gating.
  • Examined the involvement of intermediate (IK) and small (SK)-conductance, calcium-sensitive potassium channels.

Main Results:

  • Identified sparklets as calcium (Ca2+) influx through single TRPV4 cation channels in the endothelium.
  • Demonstrated cooperative gating of TRPV4 channels, where activation of three channels sufficed for maximal vasodilation.
  • Showed that muscarinic receptor signaling primarily stimulates IK and SK channels via TRPV4 sparklets, promoting vasodilation.

Conclusions:

  • Local Ca2+ influx via single TRPV4 channels is amplified by cooperative gating.
  • High Ca2+ sensitivity of IK and SK channels, stimulated by TRPV4, is essential for vasodilation.
  • This mechanism provides a novel insight into transcellular signaling in vascular tone regulation.