Cardiovascular homeostasis dependence on MICU2, a regulatory subunit of the mitochondrial calcium uniporter.

Comparative analyses of transcriptional profiles from humans and mice with cardiovascular pathologies revealed consistently elevated expression of MICU2 , a regulatory subunit of the mitochondrial calcium uniporter complex. To determine if MICU2 expression was cardioprotective, we produced and characterized Micu2 -/- mice. Mutant mice had left atrial enlargement and Micu2 -/- cardiomyocytes had delayed sarcomere relaxation and cytosolic calcium reuptake kinetics, indicating diastolic dysfunction. RNA sequencing (RNA-seq) of Micu2 -/- ventricular tissues revealed markedly reduced transcripts encoding the apelin receptor ( Micu2 -/- vs. wild type, P = 7.8 × 10-40 ), which suppresses angiotensin II receptor signaling via allosteric transinhibition. We found that Micu2 -/- and wild-type mice had comparable basal blood pressures and elevated responses to angiotensin II infusion, but that Micu2 -/- mice exhibited systolic dysfunction and 30% lethality from abdominal aortic rupture. Aneurysms and rupture did not occur with norepinephrine-induced hypertension. Aortic tissue from Micu2 -/- mice had increased expression of extracellular matrix remodeling genes, while single-cell RNA-seq analyses showed increased expression of genes related to reactive oxygen species, inflammation, and proliferation in fibroblast and smooth muscle cells. We concluded that Micu2 -/- mice recapitulate features of diastolic heart disease and define previously unappreciated roles for Micu2 in regulating angiotensin II-mediated hypertensive responses that are critical in protecting the abdominal aorta from injury.