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Myocytes from failing hearts produce slower and smaller Ca(2+) transients associated with reduction in expression of sarcoplasmic reticulum (SR) Ca(2+) ATPase and an overexpression of Na(+)/Ca(2+) exchanger. Since the physiological role of both these proteins is competing for, and removing, Ca(2+) from the cytoplasm, overexpression of the exchanger may compensate for less effective SR Ca(2+) uptake. This study demonstrates this compensatory effect and provides a quantitative description of the results.

Overexpression of the Na+/Ca2+ exchanger and inhibition of the sarcoplasmic reticulum Ca2+-ATPase in ventricular myocytes from transgenic mice