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Isolation of Human Atrial Myocytes for Simultaneous Measurements of Ca2+ Transients and Membrane Currents
10:53

Isolation of Human Atrial Myocytes for Simultaneous Measurements of Ca2+ Transients and Membrane Currents

Published on: July 3, 2013

Gap junction and Na+-H+ exchanger alternations in fibrillating and failing atrium

Yan hui, Chen junzhu, Zhu jianhua

    International Journal of Cardiology
    |July 28, 2007
    PubMed

    Insights

    Atrial fibrillation (AF) with congestive heart failure (CHF) alters atrial connexins and NHE1. These molecular changes may worsen cardiac function in patients with AF and CHF.

    Area of Science:

    • Cardiovascular Medicine
    • Molecular Cardiology

    Background:

    • Atrial fibrillation (AF) often co-occurs with congestive heart failure (CHF).
    • Investigating molecular alterations in the atria of patients with both conditions is crucial for understanding disease progression.

    Discussion:

    • This study analyzed atrial tissue from patients with AF and varying degrees of CHF undergoing mitral valve replacement.
    • Connexin 40 (Cx40) and Connexin 43 (Cx43) protein levels, along with Na(+)-H(+) exchanger isoform 1 (NHE1) activity and expression, were assessed.

    Key Insights:

    • Significant alterations in Cx40 and Cx43 protein expression were observed in relation to AF severity and CHF stage.
    • Na(+)-H(+) exchanger activity was notably elevated in patients with AF and severe CHF, correlating with increased NHE1 protein levels.

    Outlook:

    • These molecular changes, including altered connexin and NHE1 profiles, may directly contribute to the deterioration of cardiac function in the combined AF and CHF state.
    • Further research could explore therapeutic strategies targeting these specific molecular pathways to improve outcomes for patients with co-existing AF and CHF.

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