What is the clinical evidence from this study?

Study design: Other. Population: Explanted cardiac tissue. Intervention: Immunolocalization of Kv1.5 K+ channel. Primary outcome: Localization of Kv1.5 K+ channel protein in cardiac tissue.

What question did this study set out to answer?

This research aims to confirm the localization of the Kv1.5 K+ channel in cardiac tissue and understand its role in the cardiac action potential.

July 1, 1995Journal of Clinical InvestigationOpen Access

Localization of the Kv1.5 K+ channel protein in explanted cardiac tissue.

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Key result

The Kv1.5 K+ channel protein is highly localized at intercalated disk regions in adult human atrial and ventricular myocytes, with a more dispersed pattern in newborn tissue.

Population

Explanted human cardiac tissue (atrium and ventricle) and newborn tissue

Design

Preclinical

Authors

DMDeborah J. MaysVanderbilt University JFJ M FooseVanderbilt University LPLouis H. PhilipsonPacific Northwest Diabetes Research Institute

Discussion

Member takes

Implication

Extends knowledge of Kv1.5 developmental localization in human myocytes; leaves open its functional role in adult electrophysiology.

Key Points

This research aims to confirm the localization of the Kv1.5 K+ channel in cardiac tissue and understand its role in the cardiac action potential.
Utilized antibodies against Kv1.5 epitopes to localize the isoform in human atrium and ventricle.
Conducted colocalization studies with connexin and N-cadherin specific antibodies.
Assessed Kv1.5 expression differences in newborn versus adult cardiac tissue.
Kv1.5 was highly localized at intercalated disk regions in adult cardiac myocytes.
Selective staining of vascular smooth muscle indicates variations in channel structure between cardiac and vascular myocytes.
Expression of Kv1.5 was less in newborn tissue, showing a progression of organization with age similar to connexin.

Structured PICO

Population

Explanted human heart tissue from neonates and adults, as well as rat heart tissue, used to localize the Kv1.5 K+ channel protein.

Exposure

Immunohistochemical localization using antibodies directed against two distinct Kv1.5 channel epitopes

Outcome

Localization of the Kv1.5 isoform in cardiac myocytessurrogate

The Kv1.5 K+ channel is highly localized at intercalated disk regions in human cardiac myocytes, with expression patterns that change during development.

Limitations

Immunolocalization data on rare membrane proteins must be evaluated critically due to potential epitope crossreactivity.
Western analysis of human atrial and ventricular membrane preparations were not successful.
Tissue was derived from diseased organs, which may not perfectly reflect normal physiological distribution.

Cite This Study

Mays et al. (1995) studied Explanted cardiac tissue. Immunolocalization of Kv1.5 K+ channel was evaluated on Localization of Kv1.5 K+ channel protein in cardiac tissue. The Kv1.5 K+ channel protein is highly localized at intercalated disk regions in adult human atrial and ventricular myocytes, with a more dispersed pattern in newborn tissue.

synapsesocial.com/papers/6a39cd7fc5135fa86afa1e4e https://doi.org/10.1172/jci118032

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Localization of the Kv1.5 K+ channel protein in explanted cardiac tissue.

Discussion

Member takes

Implication

Key Points

Structured PICO

Limitations

Cite This Study

Localization of the Kv1.5 K+ channel protein in explanted cardiac tissue.

Discussion

Member takes

Implication

Key Points

Structured PICO

Limitations

Cite This Study

Also Consider

Also Consider