What is the clinical evidence from this study?

Study design: Other. Intervention: Na+ channel cDNA cloning and hybridization. Primary outcome: Expression of Na+ channel mRNAs.

What question did this study set out to answer?

This study aims to investigate the diversity of Na+ channel gene expression in rat cardiac tissue and identify any cardiac-specific channels.

July 1, 1989Journal of Clinical InvestigationOpen Access

Expression of diverse Na+ channel messenger RNAs in rat myocardium. Evidence for a cardiac-specific Na+ channel.

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Key result

A novel putative rat cardiac Na+ channel cDNA (pCSC-1) was isolated and shown to be expressed in a cardiac-specific manner as a 7-kb transcript.

Population

Intact cardiac tissue and purified myocardial cells from neonatal rats

Comparison

Screening of cDNA libraries with a conserved rat… vs Rat brain, skeletal muscle, denervated skeletal…

Design

Preclinical

Authors

MSM N SillsUniversity of California, San Diego YXYou XuWestlake University EBE. BaracchiniScripps Research Institute

Discussion

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Implication

Provides a molecular tool for studying cardiac Na+ channels; leaves open its physiologic significance and therapeutic potential.

Key Points

This study aims to investigate the diversity of Na+ channel gene expression in rat cardiac tissue and identify any cardiac-specific channels.
Examined Na+ channel gene expression in intact cardiac tissue and purified myocardial cells.
Used cDNA libraries from neonatal rat myocardial cells with a conserved Na+ channel probe for screening.
Conducted Northern blot analysis to assess expression levels of identified Na+ channel transcripts.
Identified the pCSC-1 cDNA probe, showing high homology with other Na+ channels.
Detected a 7-kb CSC-1 transcript specifically in rat cardiac tissue, with minimal expression in non-cardiac tissues.
Observed expression of the rat brain-1 Na+ channel in rat myocardium, but not the rat brain-2 gene.

Structured PICO

Population

Basic science study examining the diversity of Na+ channel gene expression in intact rat cardiac tissue and purified myocardial cells.

Exposure

Screening of cDNA libraries with a conserved rat brain Na+ channel cDNA probe, Northern blot analysis, and RNase protection

Comparator

Rat brain, skeletal muscle, denervated skeletal muscle, and liver tissue

Outcome

Isolation, characterization, and expression profile of a putative rat cardiac Na+ channel cDNA probe (pCSC-1)surrogate

The study identifies a novel, cardiac-specific Na+ channel gene (CSC-1) expressed in rat myocardium, distinct from brain and skeletal muscle isoforms.

Limitations

Definitive assignment of the 7-kb CSC-1 transcript as a Na+ channel mRNA and determination of its pharmacological properties awaits expression of the full-length mRNA in surrogate systems.

Cite This Study

Sills et al. (1989) studied this question. Na+ channel cDNA cloning and hybridization was evaluated on Expression of Na+ channel mRNAs. A novel putative rat cardiac Na+ channel cDNA (pCSC-1) was isolated and shown to be expressed in a cardiac-specific manner as a 7-kb transcript.

synapsesocial.com/papers/6a50382bc71e86453cce58fb https://doi.org/10.1172/jci114158

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Expression of diverse Na+ channel messenger RNAs in rat myocardium. Evidence for a cardiac-specific Na+ channel.

Discussion

Member takes

Implication

Key Points

Structured PICO

Limitations

Cite This Study

Expression of diverse Na+ channel messenger RNAs in rat myocardium. Evidence for a cardiac-specific Na+ channel.

Discussion

Member takes

Implication

Key Points

Structured PICO

Limitations

Cite This Study

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