What is the clinical evidence from this study?

Study design: Review. Population: Sino-atrial nodal cell electrophysiology.

What question did this study set out to answer?

This research aims to elucidate the ionic currents and gene expression involved in the pacemaker activity of sino-atrial nodal cells across different mammalian species.

January 1, 2003Journal of Smooth Muscle ResearchOpen Access

Sino-Atrial Nodal Cells of Mammalian Hearts: Ionic Currents and Gene Expression of Pacemaker Ionic Channels.

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Key result

The basal mechanism for spontaneous activity in SA nodal cells involves multiple ionic currents, with significant differences in pacemaker currents and their genetic expression observed across various mammalian species.

Population

Mammalian sino-atrial nodal cells from various species including mouse, rat, guinea pig, rabbit, cat…

Design

Review

Authors

HSHiroyasu SatohObayashi (Japan)

Discussion

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Implication

Species differences in SA nodal currents caution against animal model extrapolation to humans; leaves open precise human pacemaker mechanisms for targeted research.

Key Points

This research aims to elucidate the ionic currents and gene expression involved in the pacemaker activity of sino-atrial nodal cells across different mammalian species.
Examined ionic currents contributing to the depolarization of pacemaker potential in sino-atrial nodal cells.
Conducted morphological analysis under calcium overload conditions to study cellular responses.
Identified variations in pacemaker currents across species.
The I(f) current is prevalent in most species, with I(K1) currents masked in rat and monkey.
Guinea pig SA nodal cells exhibit both I(Kr) and I(Ks) currents, while porcine cells only show I(Ks) and rat/rabbit cells exhibit I(Kr) exclusively.
Differences in ionic channels arise from genetic expression variances.

Structured PICO

Population

Mammalian sino-atrial (SA) nodal cells from various species including mouse, rat, guinea pig, rabbit, cat, monkey, pig, and human.

This review highlights the complex interplay of multiple ionic currents in generating the cardiac pacemaker potential and details the species-specific differences in these currents and their underlying gene expressions.

Limitations

It is still unclear whether the same mechanisms are involved in human SA nodal cells.
Further extensive studies are needed to elucidate in more detail the as yet unknown mechanisms involved in spontaneous activity of SA nodal cells.

Cite This Study

Hiroyasu Satoh (2003) conducted a review in Sino-atrial nodal cell electrophysiology. The basal mechanism for spontaneous activity in SA nodal cells involves multiple ionic currents, with significant differences in pacemaker currents and their genetic expression observed across various mammalian species.

synapsesocial.com/papers/6a1fc1d9826ea940bb5fcab2 https://doi.org/10.1540/jsmr.39.175

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Implication

Species differences in SA nodal currents caution against animal model extrapolation to humans; leaves open precise human pacemaker mechanisms for targeted research.

Sino-Atrial Nodal Cells of Mammalian Hearts: Ionic Currents and Gene Expression of Pacemaker Ionic Channels.

Discussion

Member takes

Implication

Key Points

Structured PICO

Limitations

Cite This Study

Sino-Atrial Nodal Cells of Mammalian Hearts: Ionic Currents and Gene Expression of Pacemaker Ionic Channels.

Discussion

Member takes

Implication

Key Points

Structured PICO

Limitations

Cite This Study

Also Consider

Also Consider