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Related Experiment Videos

Sodium--potassium pump current in rabbit sino-atrial node cells

R Sakai1, N Hagiwara, N Matsuda

  • 1Heart Institute of Japan, Tokyo Women's Medical College, Shinjuku-ku.

The Journal of Physiology
|January 1, 1996
PubMed
Summary

The Na(+)-K+ pump current (Ip) was investigated in rabbit SA node cells. This study demonstrates Ip

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Molecular Physiology

Background:

  • The sino-atrial (SA) node is crucial for cardiac rhythm.
  • Understanding ion channel function in SA node cells is key to cardiac electrophysiology.

Purpose of the Study:

  • To characterize the Na(+)-K+ pump current (Ip) in rabbit SA node cells.
  • To determine the contribution of Ip to the pacemaker potential.

Main Methods:

  • Whole-cell patch-clamp technique was employed on rabbit SA node cells.
  • Ion concentrations and temperature were systematically varied to study Ip.
  • Ouabain was used to confirm the identity of the Na(+)-K+ pump current.

Main Results:

  • The Na(+)-K+ pump current (Ip) was identified and characterized in SA node cells.

Related Experiment Videos

  • Ip exhibits voltage-dependent and time-independent properties.
  • Ip is activated by external potassium and internal sodium, with specific affinities and Hill coefficients determined.
  • Ip shows cation selectivity (K+ > Rb+ > Cs+ > Li+) and is temperature-dependent (Q10 = 2.1).
  • Ip significantly contributes to the background outward current during the SA node pacemaker potential.

    • Conclusions:

    • The Na(+)-K+ pump is functionally present and contributes significantly to the electrical activity of rabbit SA node cells.
    • Detailed characterization of Ip provides insights into its role in cardiac pacemaking.
    • Findings enhance understanding of ion transport mechanisms in cardiac pacemaker cells.