Key result
CaMKII inhibitory peptides reversed the positive I(Ca-L)-frequency relationship and slowed recovery from inactivation, indicating endogenous CaMKII accelerates I(Ca-L) recovery at fast heart rates.
Population
Rat ventricular myocytes
Comparison
CaMKII inhibitory peptides vs Control conditions without AIP
Design
Preclinical
Authors
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Animal data link CaMKII to rate-dependent calcium currents; hypothesis-generating for arrhythmia mechanisms before any clinical translation.
Endogenous CaMKII activity accelerates L-type Ca2+ current recovery from inactivation, compensating for the direct inhibitory effect of intracellular Ca2+ at fast heart rates.
Guo et al. (2006) studied this question. CaMKII inhibitory peptides (AIP and myristoylated AIP) was evaluated on L-type Ca2+ current (I(Ca-L)) recovery from inactivation and frequency relationship. CaMKII inhibitory peptides reversed the positive I(Ca-L)-frequency relationship and slowed recovery from inactivation, indicating endogenous CaMKII accelerates I(Ca-L) recovery at fast heart rates.
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