CaMKII does not control mitochondrial Ca2+ uptake in cardiac myocytes

Mitochondrial Ca2+ uptake stimulates the Krebs cycle to regenerate the reduced forms of pyridine nucleotides (NADH, NADPH and FADH2) required for ATP production and reactive oxygen species (ROS) elimination. Ca2+/calmodulin‐dependent protein kinase II (CaMKII) has been proposed to regulate mitochondrial Ca2+ uptake via mitochondrial Ca2+ uniporter phosphorylation. We used two mouse models with either global deletion of CaMKIIδ (CaMKIIδ knockout) or cardiomyocyte‐specific deletion of CaMKIIδ and γ (CaMKIIδ/γ double knockout) to interrogate whether CaMKII controls mitochondrial Ca2+ uptake in isolated mitochondria and during β‐adrenergic stimulation in cardiac myocytes. CaMKIIδ/γ did not control Ca2+ uptake, respiration or ROS emission in isolated cardiac mitochondria, nor in isolated cardiac myocytes, during β‐adrenergic stimulation and pacing. The results of the present study do not support a relevant role of CaMKII for mitochondrial Ca2+ uptake in cardiac myocytes under physiological conditions.

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