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Related Experiment Videos

Endothelial K(+) channel lacks the Ca(2+) sensitivity-regulating beta subunit.

J Papassotiriou1, R Köhler, J Prenen

  • 1Abteilung für Nephrologie, Abteilung für Urologie, Institut für Klinische Pharmakologie, UKBF, Freie Universität Berlin, Germany.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|April 27, 2000
PubMed
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Endothelial large-conductance, Ca(2+)-activated K(+) channels (BK) lack beta subunits, unlike vascular smooth muscle. This alpha-subunit-only composition alters channel function and calcium sensitivity in endothelial cells.

Area of Science:

  • Physiology
  • Molecular Biology
  • Cardiovascular Research

Background:

  • Large-conductance, Ca(2+)-activated K(+) channels (BK) regulate vascular smooth muscle and endothelial cell function.
  • BK channels in vascular smooth muscle are composed of alpha and beta subunits.
  • The expression, composition, and function of BK subunits in the endothelium remain largely uncharacterized.

Purpose of the Study:

  • To investigate the subunit composition and functional characteristics of BK channels in the endothelium.
  • To determine the role of beta subunits in endothelial BK channel activity.
  • To compare BK channel regulation in endothelial cells versus vascular smooth muscle cells.

Main Methods:

  • Patch-clamp electrophysiology on porcine aortic tissue slices.

Related Experiment Videos

  • BK channel opener sensitivity assays (DHS-I and NS1619).
  • mRNA expression analysis for BK alpha and beta subunits.
  • Transfection of beta subunits into a human endothelial cell line (EA.hy 926).

    • Main Results:

    • BK channels (283 pS) were identified in intact endothelium.
    • Endothelial BK channels were activated by the alpha-subunit-selective opener NS1619 but not by the beta-subunit-dependent opener DHS-I.
    • mRNA expression analysis revealed the presence of alpha subunits but undetectable levels of beta subunits in endothelial tissue.
    • Transfection of beta subunits into endothelial cells increased Ca(2+) sensitivity of BK channels.

    Conclusions:

    • BK channels in the endothelium are primarily composed of alpha subunits, lacking associated beta subunits.
    • The absence of beta subunits results in distinct Ca(2+) sensitivity and regulation of BK channels in endothelial cells compared to vascular smooth muscle cells.
    • This finding highlights a significant difference in BK channel function and regulation between vascular endothelial and smooth muscle cells.