What question did this study set out to answer?

To clone hKChIP2 and its splice variants, determine their cardiac distribution, and characterize how they functionally modulate the human cardiac potassium channel hKv4.3.

November 1, 2001Cardiovascular ResearchOpen Access

hKChIP2 is a functional modifier of hKv4.3 potassium channels Cloning and expression of a short hKChIP2 splice variant

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Population

Xenopus oocytes and human heart tissue

Design

Preclinical

Authors

NDNiels DecherPhilipps University of Marburg

Discussion

Member takes

Implication

Does not inform clinical practice; leaves open KChIP2 modulation of Ito1 in human disease models.

Key Points

To clone hKChIP2 and its splice variants, determine their cardiac distribution, and characterize how they functionally modulate the human cardiac potassium channel hKv4.3.
Cloned human hKChIP2 and a short splice variant (hKCNIP2), mapping the gene locus to chromosome 10q24.
Assessed spatial and developmental gene expression across human adult and fetal cardiac tissues using Northern blot analysis.
Coexpressed hKv4.3 with hKChIP2 isoforms in Xenopus oocytes to quantify current amplitude, inactivation kinetics, and recovery parameters.
Northern blot analysis revealed hKChIP2 expression in adult human atria and ventricles, whereas transcripts were absent in fetal cardiac tissue.
Coexpression of hKChIP2 isoforms with hKv4.3 increased peak current amplitude, slowed channel inactivation, and accelerated recovery from inactivation.
Both hKChIP2 isoforms shifted the voltage of half-maximal channel inactivation toward more positive potentials to differing degrees.

Structured PICO

Population

Xenopus oocytes and human heart tissue

Intervention

Coexpression of hKChIP2 isoforms (including a short splice variant) with hKv4.3 potassium channels

Outcome

Electrophysiological properties of hKv4.3 currents (current amplitude, inactivation kinetics, recovery from inactivation, and voltage of half-maximal inactivation)surrogate

hKChIP2 functions as a true beta-subunit of human cardiac Ito1 by modulating hKv4.3 potassium channels, which may have implications for cardiac diseases involving Ito1 downregulation.

Cite This Study

Niels Decher (2001) studied this question.

synapsesocial.com/papers/6a83e155b0b8dfdc4c62de4d https://doi.org/10.1016/s0008-6363(01)00374-1

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hKChIP2 is a functional modifier of hKv4.3 potassium channels Cloning and expression of a short hKChIP2 splice variant

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

hKChIP2 is a functional modifier of hKv4.3 potassium channels Cloning and expression of a short hKChIP2 splice variant

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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