1. ATPase Inhibitory Factor-1 Disrupts Mitochondrial Ca 2+ Handling and Promotes Pathological Cardiac Hypertrophy through CaMKIIδ.
- Author
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Pavez-Giani MG, Sánchez-Aguilera PI, Bomer N, Miyamoto S, Booij HG, Giraldo P, Oberdorf-Maass SU, Nijholt KT, Yurista SR, Milting H, van der Meer P, Boer RA, Heller Brown J, Sillje HWH, and Westenbrink BD
- Subjects
- Animals, Animals, Newborn, Apoptosis, Calcium-Calmodulin-Dependent Protein Kinase Type 2 genetics, Cardiomegaly genetics, Cardiomegaly metabolism, Humans, Mice, Mice, Transgenic, Mitochondria metabolism, Myocardial Ischemia genetics, Myocardial Ischemia metabolism, Myocytes, Cardiac metabolism, Proteins genetics, Rats, Sarcoplasmic Reticulum metabolism, Signal Transduction, ATPase Inhibitory Protein, Calcium metabolism, Calcium-Calmodulin-Dependent Protein Kinase Type 2 metabolism, Cardiomegaly pathology, Mitochondria pathology, Myocardial Ischemia pathology, Myocytes, Cardiac pathology, Proteins metabolism
- Abstract
ATPase inhibitory factor-1 (IF1) preserves cellular ATP under conditions of respiratory collapse, yet the function of IF1 under normal respiring conditions is unresolved. We tested the hypothesis that IF1 promotes mitochondrial dysfunction and pathological cardiomyocyte hypertrophy in the context of heart failure (HF). Methods and results: Cardiac expression of IF1 was increased in mice and in humans with HF, downstream of neurohumoral signaling pathways and in patterns that resembled the fetal-like gene program. Adenoviral expression of wild-type IF1 in primary cardiomyocytes resulted in pathological hypertrophy and metabolic remodeling as evidenced by enhanced mitochondrial oxidative stress, reduced mitochondrial respiratory capacity, and the augmentation of extramitochondrial glycolysis. Similar perturbations were observed with an IF1 mutant incapable of binding to ATP synthase (E55A mutation), an indication that these effects occurred independent of binding to ATP synthase. Instead, IF1 promoted mitochondrial fragmentation and compromised mitochondrial Ca
2+ handling, which resulted in sarcoplasmic reticulum Ca2+ overloading. The effects of IF1 on Ca2+ handling were associated with the cytosolic activation of calcium-calmodulin kinase II (CaMKII) and inhibition of CaMKII or co-expression of catalytically dead CaMKIIδC was sufficient to prevent IF1 induced pathological hypertrophy. Conclusions: IF1 represents a novel member of the fetal-like gene program that contributes to mitochondrial dysfunction and pathological cardiac remodeling in HF. Furthermore, we present evidence for a novel, ATP-synthase-independent, role for IF1 in mitochondrial Ca2+ handling and mitochondrial-to-nuclear crosstalk involving CaMKII.- Published
- 2021
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