Key result
In guinea-pig ventricular myocytes, isoprenaline shifted the Na(+)-K+ pump current-voltage relationship by approximately -30 mV at high intracellular calcium, increasing current at negative voltages.
Beta-adrenergic activation modulates the Na+-K+ pump current-voltage relationship in a calcium-dependent manner, potentially impacting heart rate and cardiac contractility regulation.
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Hypothesis-generating for beta-adrenergic Na-K pump modulation in calcium-overloaded myocytes; human studies needed before clinical relevance.
Gao et al. (1996) studied this question. Isoprenaline vs. Absence of isoprenaline was evaluated on Current-voltage (I-V) relationship of the Na(+)-K+ pump current (Ip). In guinea-pig ventricular myocytes, isoprenaline shifted the Na(+)-K+ pump current-voltage relationship by approximately -30 mV at high intracellular calcium, increasing current at negative voltages.
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