What question did this study set out to answer?

The study aims to understand how PKA activation influences the trafficking and function of the human cardiac sodium channel hH1.

July 7, 2000Circulation Research

Activation of Protein Kinase A Modulates Trafficking of the Human Cardiac Sodium Channel in Xenopus Oocytes

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Population

Xenopus oocytes expressing recombinant human cardiac Na channel, with or without hbeta subunit coexpression…

Comparison

Activation of protein kinase A (PKA) vs Absence of PKA activation, or preincubation with…

Design

Preclinical

Authors

JZJingsong ZhouAnhui University JYJianxun YiThe University of Texas at Arlington NHNingNing HuVanderbilt University

Discussion

Member takes

Implication

Hypothesis-generating for PKA effects on cardiac Na+ channels; leaves open translation to human arrhythmias or therapy.

Key Points

The study aims to understand how PKA activation influences the trafficking and function of the human cardiac sodium channel hH1.
Examined effects of PKA activation on recombinant human cardiac Na(+) channel hH1 in Xenopus oocytes.
Investigated the voltage dependence and current characteristics in the presence and absence of hbeta(1) subunit coexpression.
Utilized chloroquine and monensin to explore membrane recycling and trafficking of sodium channels.
Activation of PKA increased Na(+) current without saturation over one hour (exact metrics not provided).
Chloroquine and monensin reduced hH1 current, indicating rapid channel turnover at the cell surface.
The I-II interdomain loop of hH1 was identified as responsible for the PKA effect on channel modulation.

Structured PICO

Population

Xenopus oocytes expressing recombinant human cardiac Na(+) channel (hH1), with or without hbeta(1) subunit coexpression, and chimeric constructs of hH1 and skeletal muscle Na(+) channel (hSKM1)

Intervention

Activation of protein kinase A (PKA)

Comparator

Absence of PKA activation, or preincubation with chloroquine and monensin

Outcome

Changes in Na(+) current and channel trafficking to the plasma membranesurrogate

Activation of PKA modulates both the trafficking and function of the human cardiac sodium channel (hH1), providing a molecular mechanism for beta-adrenergic regulation of cardiac conduction.

Cite This Study

Zhou et al. (2000) studied this question.

synapsesocial.com/papers/6a747fa6d93df8ecca091031 https://doi.org/10.1161/01.res.87.1.33

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Activation of Protein Kinase A Modulates Trafficking of the Human Cardiac Sodium Channel in Xenopus Oocytes

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Activation of Protein Kinase A Modulates Trafficking of the Human Cardiac Sodium Channel in Xenopus Oocytes

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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