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Cardiovascular Homeostasis Dependence on MICU2, a Regulatory Subunit of the Mitochondrial Calcium Uniporter

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Cardiovascular Homeostasis Dependence on MICU2, a Regulatory Subunit of the Mitochondrial Calcium Uniporter Cardiovascular homeostasis dependence on MICU2, a regulatory subunit of the mitochondrial calcium uniporter Alexander G. Bicka, Hiroko Wakimotoa, Kimberli J. Kamerb,c, Yasemin Sancakb,c, Olga Goldbergerb,c, Anna Axelssona, Daniel M. DeLaughtera, Joshua M. Gorhama, Vamsi K. Moothab,c,d, J. G. Seidmana, and Christine E. Seidmana,d,e,1 aDepartment of Genetics, Harvard Medical School, Boston, MA 02115; bDepartment of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114; cDepartment of Systems Biology, Harvard Medical School, Boston, MA 02115; dHoward Hughes Medical Institute, Chevy Chase, MD 20815; and eCardiovascular Division, Brigham and Women’s Hospital, Boston, MA 02115 Contributed by Christine E. Seidman, September 8, 2017 (sent for review June 26, 2017; reviewed by Kenneth E. Bernstein and Elizabeth Murphy) Comparative analyses of transcriptional profiles from humans and dosis, and stroke-like episodes) and MERRF (myoclonic epi- mice with cardiovascular pathologies revealed consistently ele- lepsy with ragged-red fibers) (21). Likewise, cardiomyopathy vated expression of MICU2, a regulatory subunit of the mitochon- occurs from mutations in nuclear-encoded mitochondrial genes drial calcium uniporter complex. To determine if MICU2 expression that function in oxidative phosphorylation, including TMEM70 −/− was cardioprotective, we produced and characterized Micu2 [mitochondrial complex V ATP synthase deficiency (22)], AGK −/− mice. Mutant mice had left atrial enlargement and Micu2 car- [Sengers or mitochondrial depletion syndrome (23)], and AARS2 diomyocytes had delayed sarcomere relaxation and cytosolic [infantile hypertrophic mitochondrial cardiomyopathy (24)]. In calcium reuptake kinetics, indicating diastolic dysfunction. RNA addition to heart disease, the abnormal mitochondrial responses Micu2−/− sequencing (RNA-seq) of ventricular tissues revealed mark- in these disorders cause diabetes, neurological disease, vision Micu2−/− edly reduced transcripts encoding the apelin receptor ( vs. loss, deafness (20), and, less commonly, aortic dilation (25) and wild type, P = 7.8 × 10−40), which suppresses angiotensin II receptor Micu2−/− rupture (26). signaling via allosteric transinhibition. We found that and We hypothesized that key mediators of altered calcium ho- wild-type mice had comparable basal blood pressures and elevated Micu2−/− meostasis and energetics, processes in which mitochondria play responses to angiotensin II infusion, but that mice exhibited central roles, might be consistently dysregulated across many systolic dysfunction and 30% lethality from abdominal aortic rupture. cardiomyopathies. To identify these, we performed bioinformatic Aneurysms and rupture did not occur with norepinephrine-induced −/− comparisons of cardiac transcriptional datasets from humans hypertension. Aortic tissue from Micu2 mice had increased expres- and mouse ventricular tissues with HCM or DCM. Among sion of extracellular matrix remodeling genes, while single-cell RNA- MICU2 seq analyses showed increased expression of genes related to reactive these, we identified one consistently dysregulated gene, ,a oxygen species, inflammation, and proliferation in fibroblast and calcium-sensing regulatory subunit of the mitochondrial cal- −/− smooth muscle cells. We concluded that Micu2 mice recapitulate cium uniporter complex. Here we test the hypothesis that MICU2 is a critical responder to cardiovascular stress. From features of diastolic heart disease and define previously unappreciated −/− roles for Micu2 in regulating angiotensin II-mediated hypertensive re- studies of Micu2 mice, we report unexpected phenotypes sponses that are critical in protecting the abdominal aorta from injury. that link mitochondrial calcium sensing and cardiovascular stress responses. mitochondrial calcium uniporter | diastolic dysfunction | aortic aneurysms | hypertension | calcium Significance he heart adapts to a variety of different stresses throughout Hypertension increases the risk for development of abdominal Tlife by adopting strategies to maintain excitation–contraction aortic aneurysms, a silent pathology that is prone to rupture and coupling and balance energy utilization and production. Genetic cause sudden cardiac death. Male gender, smoking, and hyper- cardiomyopathies that cause ventricular hypertrophy (HCM) or tension appear to increase risk for development of abdominal dilatation (DCM) evoke chronic stress responses that have been aortic aneurysms by provoking oxidative stress responses in car- identified in biochemical studies and transcriptional analyses of diovascular tissues. Here we uncovered unexpected linkages be- diseased cardiac tissues derived from human patients and model tween the calcium-sensing regulatory subunit MICU2 of the mitochondrial calcium uniporter and stress responses. We show systems. Over a thousand genes with differential expression have −/− been implicated in these responses, including molecules involved that naive Micu2 mice had abnormalities of cardiac relaxation in cellular calcium flux (1–3). but, with modest blood pressure elevation, developed abdominal Altered cardiac energetics is also a fundamental mechanistic aortic aneurysms with spontaneous rupture. These findings im- component of HCM and DCM that is caused by mutations in plicate mitochondrial calcium homeostasis as a critical pathway sarcomere protein genes (4–8), and pharmacologic strategies are involved in protecting cardiovascular tissues from oxidative stress. under study to correct energy deficits in patients with these disorders (9–11). Mutations in sarcomere proteins impact exci- Author contributions: A.G.B., V.K.M., and C.E.S. designed research; A.G.B., H.W., K.J.K., – – Y.S., O.G., A.A., D.M.D., and J.M.G. performed research; Y.S., O.G., A.A., and V.K.M. tation contraction coupling (12 15) and can alter cellular cal- contributed new reagents/analytic tools; A.G.B., H.W., K.J.K., Y.S., D.M.D., V.K.M., J.G.S., cium flux, which in turn perturbs the balance of energy utilization and C.E.S. analyzed data; and A.G.B., Y.S., V.K.M., J.G.S., and C.E.S. wrote the paper. and production in cardiomyocytes (16, 17). Changes in energy Reviewers: K.E.B., Cedars-Sinai Medical Center; and E.M., NIH. homeostasis can also reactivate fetal gene programs and pro- The authors declare no conflict of interest. mote profibrotic pathways and maladaptive remodeling that re- Freely available online through the PNAS open access option. sult in overt cardiomyopathy (18, 19). 1To whom correspondence should be addressed. Email: [email protected]. Mutations that directly impact mitochondrial function also edu. cause cardiomyopathies (20). These include mtDNA disorders This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10. such as MELAS (mitochondrial encephalomyopathy, lactic aci- 1073/pnas.1711303114/-/DCSupplemental. E9096–E9104 | PNAS | Published online October 9, 2017 www.pnas.org/cgi/doi/10.1073/pnas.1711303114 Downloaded by guest on September 26, 2021 Results isoproterenol infusion or transverse aortic constriction, rapid PNAS PLUS We performed a bioinformatic screen to identify stress-responsive physiologic fight-or-flight responses were impaired (34–38). More- molecules in cardiomyopathy by intersecting differentially expressed over, mice expressing a dominant-negative Mcu had altered cardiac 2+ genes from nine left ventricle (LV) transcriptome datasets: seven oxygen utilization, cytoplasmic Ca homeostasis, and pathologic from human heart tissue from patients with HCM (SI Appendix, responses to ischemia-reperfusion injury (39). MICU2 Table S1), and two from mouse models of HCM (Myh6 p.R403Q) These data prompted us to prioritize for further study. MICU2 (1) and DCM (Pln p.R9C) (27). Approximately 300 genes were We hypothesized that if increased expression was car- MICU2 differentially expressed in both mouse cardiomyopathy datasets. dioprotective, deletion of would promote cardiovascular Micu2−/− Intersecting this list with the seven human transcriptomes identified dysfunction. To test this model, we generated a mouse using a gene-trap vector (Fig. 1A and SI Appendix, Fig. S1A). only 6 genes that were consistently expressed in the same direction Micu2+/− Micu2−/− among all nine transcriptome profiles that could plausibly function and mice bred and produced offspring in Mendelian ratios, had comparable sizes and activity levels to in the stress response. Three of these genes participate in pathways > Micu2+/− involving cell growth and metabolism, including IGFBP6 (insulin wild-type littermates, and routinely lived for 18 mo. mice had ∼50% normal levels of Micu2 transcripts in hepatic, growth factor binding protein 6), PRKAB2 (the beta-2 non- renal, and cardiac tissue. Transcript levels were further reduced catalytic subunit of AMP-activated protein kinase), and RHEB −/− in Micu2 mice (SI Appendix, Fig. S1B). We did not detect (a small GTPase superfamily member that functions in insulin/ −/− Micu2 protein in LV, aorta, or liver tissues from Micu2 mice TOR/S6K signaling). Another gene, DAPK3 (expression of the by immunoblotting (Fig. 1 B and C and SI Appendix, Fig. S2). death-associated protein kinase 3), participates in apoptosis path- Micu2 UCP2 Consistent with prior results of RNAi targeting in mouse ways. Two mitochondrial proteins were also identified: (mi- liver (28), both Micu1 and Mcu protein levels were significantly tochondrial uncoupling protein), that encodes an inner-membrane Micu2−/− SI Appendix MICU2
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