Key result
In cardiac-specific NCX knockout mice, peak transient outward current (Ito) was increased by 78% compared to wild-type, serving as the major mechanism for action potential shortening.
Population
Cardiac-specific Na-Ca exchanger knockout mice and wild-type mice
Comparison
Na(+)-Ca(2+) exchanger (NCX) knockout vs Wild-type (WT) mice
Design
Preclinical
Authors
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May suggest protective AP shortening against Ca overload in NCX KO models; leaves open translation to human arrhythmias or therapies.
Effect estimate: 78% increase
In NCX knockout mice, upregulation of the transient outward current (I(to)) is the primary mechanism for action potential shortening, likely serving as a regulatory mechanism to limit calcium influx and prevent calcium overload.
Pott et al. (2006) studied Na+-Ca2+ exchanger (NCX) knockout. Na+-Ca2+ exchanger (NCX) knockout vs. Wild-type (WT) mice was evaluated on Peak transient outward current (Ito) (78% increase). In cardiac-specific NCX knockout mice, peak transient outward current (Ito) was increased by 78% compared to wild-type, serving as the major mechanism for action potential shortening.
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