Key result
SEA0400 has no effect on mitochondrial Ca2+, suggesting protection stems from plasmalemmal NCX inhibition.
Why the study?
The mitochondrial effects of SEA0400, a plasmalemmal Na+/Ca2+ exchanger inhibitor that reduces mitochondrial Ca2+ overload during myocardial ischemia, were unclear.
Population
Digitonin-permeabilized H9c2 cardiomyocytes expressing mitochondrial-targeted Ca2+ indicator yellow cameleon 3.1
Comparison
SEA0400 vs control under normal and ischemic conditions
Design
Preclinical experimental study
Authors
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Prioritizes plasmalemmal NCX targets for future inhibitors; animal data leave mitochondrial contributions unresolved for clinical testing.
The mitochondria-protective effects of SEA0400 are likely mediated by inhibition of plasmalemmal NCX rather than mitochondrial NCX.
Namekata et al. (2017) studied Myocardial ischemia (in vitro model). SEA0400 vs. Control was evaluated on Mitochondrial Ca2+ concentration (yellow cameleon fluorescence ratio). SEA0400 had no direct effect on mitochondrial Ca2+ concentration under normal or ischemic conditions, suggesting its protective effects stem from plasmalemmal rather than mitochondrial NCX inhibition.
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