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Related Experiment Videos

Functional and molecular evidence of MaxiK channel beta1 subunit decrease with coronary artery ageing in the rat.

Kazuhide Nishimaru1, Mansoureh Eghbali, Rong Lu

  • 1Division of Molecular Medicine, Department of Anaesthesiology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1778, USA.

The Journal of Physiology
|July 24, 2004
PubMed
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Aging reduces large-conductance, voltage- and Ca2+-activated K+ channels (MaxiK) in coronary myocytes by decreasing both alpha and beta1 subunit expression. This age-related MaxiK reduction impacts coronary contraction and flow regulation.

Area of Science:

  • Cardiovascular Physiology
  • Ion Channel Biology
  • Aging Research

Background:

  • Large-conductance, voltage- and Ca2+-activated K+ channels (MaxiK, BK) regulate vascular tone.
  • MaxiK channels comprise alpha and beta1 subunits, influencing channel properties.
  • Age-related decline in alpha subunit expression is known, but beta1 subunit changes and mechanisms are unclear.

Purpose of the Study:

  • Investigate age-related changes in MaxiK channel expression and function in coronary myocytes.
  • Determine the mechanism of age-dependent alpha subunit reduction.
  • Examine the impact of aging on beta1 subunit expression and MaxiK channel properties.

Main Methods:

  • Compared MaxiK channel function, alpha and beta1 subunit transcript levels in young and old F344 rat coronary myocytes.

Related Experiment Videos

  • Assessed channel kinetics, Ca2+/voltage sensitivity, and pharmacology (dehydrosoyasaponin-I, iberiotoxin).
  • Evaluated coronary ring contraction and relaxation responses to iberiotoxin and 5-HT.

    • Main Results:

    • Age-dependent reduction in alpha subunit protein is linked to transcript downregulation.
    • Beta1 subunit transcripts also decreased proportionally with age.
    • MaxiK channel properties remained similar between young and old rats, suggesting preserved subunit coassembly.
    • Iberiotoxin-induced contraction of coronary rings was reduced by ~50% in old rats.
    • 5-HT contractile efficacy was reduced by iberiotoxin in young vs. old arteries.

    Conclusions:

    • Age-related MaxiK reduction involves parallel decreases in alpha and beta1 functional expression via transcript downregulation.
    • This reduction likely impacts basal and stimulated coronary contraction.
    • Altered coronary flow regulation and increased coronary morbidity in the elderly may result from these changes.