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Cardiology

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Salt-inducible kinase 1 maintains HDAC7 stability to promote pathologic cardiac remodeling
Austin Hsu, … , Benoit G. Bruneau, Saptarsi M. Haldar
Austin Hsu, … , Benoit G. Bruneau, Saptarsi M. Haldar
Published February 27, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI133753.
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Salt-inducible kinase 1 maintains HDAC7 stability to promote pathologic cardiac remodeling

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Abstract

Salt inducible kinases (SIKs) are key regulators of cellular metabolism and growth, but their role in cardiomyocyte plasticity and heart failure pathogenesis remains unknown. Here, we showed that loss of SIK1 kinase activity protected against adverse cardiac remodeling and heart failure pathogenesis in rodent models and human iPSC-derived cardiomyocytes. We found that SIK1 phosphorylated and stabilized histone deacetylase 7 (HDAC7) protein during cardiac stress, an event that is required for pathologic cardiomyocyte remodeling. Gain- and loss-of-function studies of HDAC7 in cultured cardiomyocytes implicated HDAC7 as a pro-hypertrophic signaling effector that can induce c-Myc expression, indicating a functional departure from the canonical MEF2 co-repressor function of class IIa HDACs. Taken together, our findings reveal what we believe to be a previously unrecognized role for a SIK1-HDAC7 axis in regulating cardiac stress responses and implicate this pathway as a potential target in human heart failure.

Authors

Austin Hsu, Qiming Duan, Sarah McMahon, Yu Huang, Sarah A.B. Wood, Nathanael S. Gray, Biao Wang, Benoit G. Bruneau, Saptarsi M. Haldar

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Erythrocyte-derived microvesicles induce arterial spasms in JAK2V617F myeloproliferative neoplasm
Johanne Poisson, … , Chantal M. Boulanger, Pierre-Emmanuel Rautou
Johanne Poisson, … , Chantal M. Boulanger, Pierre-Emmanuel Rautou
Published February 11, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI124566.
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Erythrocyte-derived microvesicles induce arterial spasms in JAK2V617F myeloproliferative neoplasm

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Abstract

Arterial cardiovascular events are the leading cause of death in patients with JAK2V617F myeloproliferative neoplasms (MPN). However, their mechanisms are poorly understood. The high prevalence of myocardial infarction without significant coronary stenosis or atherosclerosis in patients with MPN suggests that vascular function is altered. Consequences of JAK2V617F mutation on vascular reactivity are unknown. We observe here increased responses to vasoconstrictors in arteries from Jak2V617F mice, resulting from disturbed endothelial nitric oxide pathway and increased endothelial oxidative stress. This response was reproduced in wild-type mice by circulating microvesicles isolated from patients carrying JAK2V617F and by erythrocyte-derived microvesicles from transgenic mice. Microvesicles of other cellular origins had no effect. This effect was observed ex vivo on isolated aortas, but also in vivo on femoral arteries. Proteomic analysis of microvesicles derived from JAK2V617F erythrocytes identified increased expression of myeloperoxidase as the likely mechanism accounting for microvesicles effect. Myeloperoxidase inhibition in microvesicles derived from JAK2V617F erythrocytes supressed their effect on oxidative stress. Antioxidants, such as simvastatin and N-acetyl-cysteine, improved arterial dysfunction in Jak2V617F mice. In conclusion, JAK2V617F MPN are characterized by exacerbated vasoconstrictor responses resulting from increased endothelial oxidative stress caused by circulating erythrocyte-derived microvesicles. Simvastatin appears as promising therapeutic strategy in this setting.

Authors

Johanne Poisson, Marion Tanguy, Hortense Davy, Fatoumata Camara, Marie-Belle El Mdawar, Marouane Kheloufi, Tracy Dagher, Cécile Devue, Juliette Lasselin, Aurelie Plessier, Salma Merchant, Olivier Blanc-Brude, Michele Souyri, Nathalie Mougenot, Florent Dingli, Damarys Loew, Stephane N. Hatem, Chloe James, Jean-Luc Villeval, Chantal M. Boulanger, Pierre-Emmanuel Rautou

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Cardioprotective GLP-1 metabolite prevents ischemic cardiac injury by inhibiting mitochondrial trifunctional protein-α
M. Ahsan Siraj, … , Peter Backx, Mansoor Husain
M. Ahsan Siraj, … , Peter Backx, Mansoor Husain
Published January 27, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI99934.
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Cardioprotective GLP-1 metabolite prevents ischemic cardiac injury by inhibiting mitochondrial trifunctional protein-α

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Abstract

Mechanisms mediating the cardioprotective actions of glucagon-like peptide 1 (GLP-1) were unknown. Here, we show in both ex vivo and in vivo models of ischemic injury that treatment with GLP-1(28–36), a neutral endopeptidase–generated (NEP-generated) metabolite of GLP-1, was as cardioprotective as GLP-1 and was abolished by scrambling its amino acid sequence. GLP-1(28–36) enters human coronary artery endothelial cells (caECs) through macropinocytosis and acts directly on mouse and human coronary artery smooth muscle cells (caSMCs) and caECs, resulting in soluble adenylyl cyclase Adcy10–dependent (sAC-dependent) increases in cAMP, activation of protein kinase A, and cytoprotection from oxidative injury. GLP-1(28–36) modulates sAC by increasing intracellular ATP levels, with accompanying cAMP accumulation lost in sAC–/– cells. We identify mitochondrial trifunctional protein-α (MTPα) as a binding partner of GLP-1(28–36) and demonstrate that the ability of GLP-1(28–36) to shift substrate utilization from oxygen-consuming fatty acid metabolism toward oxygen-sparing glycolysis and glucose oxidation and to increase cAMP levels is dependent on MTPα. NEP inhibition with sacubitril blunted the ability of GLP-1 to increase cAMP levels in coronary vascular cells in vitro. GLP-1(28–36) is a small peptide that targets novel molecular (MTPα and sAC) and cellular (caSMC and caEC) mechanisms in myocardial ischemic injury.

Authors

M. Ahsan Siraj, Dhanwantee Mundil, Sanja Beca, Abdul Momen, Eric A. Shikatani, Talat Afroze, Xuetao Sun, Ying Liu, Siavash Ghaffari, Warren Lee, Michael B. Wheeler, Gordon Keller, Peter Backx, Mansoor Husain

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Prevention of Connexin43 remodeling protects against duchenne muscular dystrophy cardiomyopathy
Eric Himelman, … , Jorge E. Contreras, Diego Fraidenraich
Eric Himelman, … , Jorge E. Contreras, Diego Fraidenraich
Published January 7, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI128190.
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Prevention of Connexin43 remodeling protects against duchenne muscular dystrophy cardiomyopathy

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Abstract

Aberrant expression of the cardiac gap junction protein connexin-43 (Cx43) has been suggested to play a role in the development of cardiac disease in the mdx mouse model of Duchenne muscular dystrophy (DMD), however a mechanistic understanding of this association is lacking. Here, we identified a reduction of phosphorylation of Cx43 serines S325/S328/S330 in human and mouse DMD hearts. We hypothesized that hypo-phosphorylation of Cx43 serine-triplet triggers pathological Cx43 redistribution to the lateral sides of cardiomyocytes (remodeling). Therefore, we generated knock-in mdx mice in which the Cx43 serine-triplet was replaced with either phospho-mimicking glutamic acids (mdxS3E) or non-phosphorylatable alanines (mdxS3A). The mdxS3E but not mdxS3A mice were resistant to Cx43 remodeling with a corresponding reduction of Cx43 hemichannel activity. MdxS3E cardiomyocytes displayed improved intracellular Ca2+ signaling and a reduction of NOX2/reactive oxygen species (ROS) production. Furthermore, mdxS3E mice were protected against inducible arrhythmias, related lethality and the development of cardiomyopathy. Inhibition of microtubule polymerization by colchicine reduced both NOX2/ROS and oxidized CaMKII, increased S325/S328/S330 phosphorylation and prevented Cx43 remodeling in mdx hearts. Together, these results demonstrate a mechanism of dystrophic Cx43-remodeling and suggest that targeting Cx43 may be a therapeutic strategy to prevent heart dysfunction and arrhythmias in DMD patients.

Authors

Eric Himelman, Mauricio A. Lillo, Julie Nouet, J. Patrick Gonzalez, Qingshi Zhao, Lai-Hua Xie, Hong Li, Tong Liu, Xander H.T. Wehrens, Paul D. Lampe, Glenn I. Fishman, Natalia Shirokova, Jorge E. Contreras, Diego Fraidenraich

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Glibenclamide reverses cardiovascular abnormalities of Cantu Syndrome driven by KATP channel overactivity
Conor McClenaghan, … , Maria S. Remedi, Colin G. Nichols
Conor McClenaghan, … , Maria S. Remedi, Colin G. Nichols
Published December 10, 2019
Citation Information: J Clin Invest. 2019. https://doi.org/10.1172/JCI130571.
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Glibenclamide reverses cardiovascular abnormalities of Cantu Syndrome driven by KATP channel overactivity

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Abstract

Cantu Syndrome (CS) is a complex disorder caused by gain-of-function (GoF) mutations in ABCC9 and KCNJ8, which encode the SUR2 and Kir6.1 subunits, respectively, of vascular smooth muscle (VSM) KATP channels. CS includes dilated vasculature, marked cardiac hypertrophy, and other cardiovascular abnormalities. There is currently no targeted therapy, and it is unknown whether cardiovascular features can be reversed once manifest. Using combined transgenic and pharmacological approaches in a knock-in mouse model of CS, we have shown that reversal of vascular and cardiac phenotypes can be achieved (1) by genetic downregulation of KATP channel activity specifically in VSM, and (2) by chronic administration of the clinically-used KATP channel inhibitor, glibenclamide. These findings demonstrate (i) that VSM KATP channel GoF underlies CS cardiac enlargement, (ii) reversibility of CS-associated abnormalities and (iii) evidence of in vivo efficacy of glibenclamide as a therapeutic agent in CS.

Authors

Conor McClenaghan, Yan Huang, Zihan Yan, Theresa Harter, Carmen M. Halabi, Rod Chalk, Attila Kovacs, Gijs van Haaften, Maria S. Remedi, Colin G. Nichols

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Apelin directs endothelial cell differentiation and vascular repair following immune-mediated injury
Andrew G. Masoud, … , Gavin Y. Oudit, Allan G. Murray
Andrew G. Masoud, … , Gavin Y. Oudit, Allan G. Murray
Published November 18, 2019
Citation Information: J Clin Invest. 2019. https://doi.org/10.1172/JCI128469.
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Apelin directs endothelial cell differentiation and vascular repair following immune-mediated injury

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Abstract

Sustained, indolent immune injury of the vasculature of a heart transplant limits long-term graft and recipient survival. This injury is mitigated by a poorly characterized, maladaptive repair response. Vascular endothelial cells respond to proangiogenic cues in the embryo by differentiation to specialized phenotypes, associated with expression of apelin. In the adult, the role of developmental proangiogenic cues in repair of the established vasculature is largely unknown. We found that human and minor histocompatibility–mismatched donor mouse heart allografts with alloimmune-mediated vasculopathy upregulated expression of apelin in arteries and myocardial microvessels. In vivo, loss of donor heart expression of apelin facilitated graft immune cell infiltration, blunted vascular repair, and worsened occlusive vasculopathy in mice. In vitro, an apelin receptor agonist analog elicited endothelial nitric oxide synthase activation to promote endothelial monolayer wound repair, and reduce immune cell adhesion. Thus, apelin acted as an autocrine growth cue to sustain vascular repair and mitigate the effects of immune injury. Treatment with an apelin receptor agonist after vasculopathy was established markedly reduced progression of arterial occlusion in mice. Together, these initial data identify proangiogenic apelin as a key mediator of coronary vascular repair and a pharmacotherapeutic target for immune-mediated injury of the coronary vasculature.

Authors

Andrew G. Masoud, Jiaxin Lin, Abul K. Azad, Maikel A. Farhan, Conrad Fischer, Lin F. Zhu, Hao Zhang, Banu Sis, Zamaneh Kassiri, Ronald B. Moore, Daniel Kim, Colin C. Anderson, John C. Vederas, Benjamin A. Adam, Gavin Y. Oudit, Allan G. Murray

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Targetable cellular signaling events mediate vascular pathology in vascular Ehlers-Danlos syndrome
Caitlin J. Bowen, … , Elena Gallo MacFarlane, Harry C. Dietz
Caitlin J. Bowen, … , Elena Gallo MacFarlane, Harry C. Dietz
Published October 22, 2019
Citation Information: J Clin Invest. 2019. https://doi.org/10.1172/JCI130730.
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Targetable cellular signaling events mediate vascular pathology in vascular Ehlers-Danlos syndrome

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Abstract

Vascular Ehlers-Danlos syndrome (vEDS) is an autosomal-dominant connective tissue disorder caused by heterozygous mutations in the COL3A1 gene, which encodes the pro-alpha 1 chain of collagen III. Loss of structural integrity of the extracellular matrix is believed to drive the signs and symptoms of this condition, including spontaneous arterial dissection and/or rupture, the major cause of mortality. We created two mouse models of vEDS that carry heterozygous mutations in Col3a1 that encode glycine substitutions analogous to those found in patients, and showed that signaling abnormalities in the PLC/IP3/PKC/ERK pathway (phospholipase C/inositol 1,4,5-triphosphate/protein kinase C/extracellular signal-regulated kinase) are major mediators of vascular pathology.Treatment with pharmacologic inhibitors of ERK1/2 or PKC-beta prevented death due to spontaneous aortic rupture. Additionally, we found that pregnancy- and puberty-associated accentuation of vascular risk, also seen in vEDS patients, is rescued by attenuation of oxytocin and androgen signaling, respectively. Taken together, our results provide evidence that targetable signaling abnormalities contribute to the pathogenesis of vEDS, highlighting unanticipated therapeutic opportunities.

Authors

Caitlin J. Bowen, Juan Francisco Calderón Giadrosic, Zachary Burger, Graham Rykiel, Elaine C. Davis, Mark R. Helmers, Kelly Benke, Elena Gallo MacFarlane, Harry C. Dietz

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Atrial fibrillation risk loci interact to modulate Ca2+-dependent atrial rhythm homeostasis
Brigitte Laforest, … , Christopher R. Weber, Ivan P. Moskowitz
Brigitte Laforest, … , Christopher R. Weber, Ivan P. Moskowitz
Published October 14, 2019
Citation Information: J Clin Invest. 2019. https://doi.org/10.1172/JCI124231.
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Atrial fibrillation risk loci interact to modulate Ca2+-dependent atrial rhythm homeostasis

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Abstract

Atrial fibrillation (AF), defined by disorganized atrial cardiac rhythm, is the most prevalent cardiac arrhythmia worldwide. Recent genetic studies have highlighted a major heritable component and identified numerous loci associated with AF risk, including the cardiogenic transcription factor genes TBX5, GATA4, and NKX2-5. We report that Tbx5 and Gata4 interact with opposite signs for atrial rhythm controls compared with cardiac development. Using mouse genetics, we found that AF pathophysiology caused by Tbx5 haploinsufficiency, including atrial arrhythmia susceptibility, prolonged action potential duration, and ectopic cardiomyocyte depolarizations, were all rescued by Gata4 haploinsufficiency. In contrast, Nkx2-5 haploinsufficiency showed no combinatorial effect. The molecular basis of the TBX5/GATA4 interaction included normalization of intra-cardiomyocyte calcium flux and expression of calcium channel genes Atp2a2 and Ryr2. Furthermore, GATA4 and TBX5 showed antagonistic interactions on an Ryr2 enhancer. Atrial rhythm instability caused by Tbx5 haploinsufficiency was rescued by a decreased dose of phospholamban, a sarco/endoplasmic reticulum Ca2+-ATPase inhibitor, consistent with a role for decreased sarcoplasmic reticulum calcium flux in Tbx5-dependent AF susceptibility. This work defines a link between Tbx5 dose, sarcoplasmic reticulum calcium flux, and AF propensity. The unexpected interactions between Tbx5 and Gata4 in atrial rhythm control suggest that evaluating specific interactions between genetic risk loci will be necessary for ascertaining personalized risk from genetic association data.

Authors

Brigitte Laforest, Wenli Dai, Leonid Tyan, Sonja Lazarevic, Kaitlyn M. Shen, Margaret Gadek, Michael T. Broman, Christopher R. Weber, Ivan P. Moskowitz

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Myocardial infarction triggers cardioprotective antigen-specific T helper cell responses
Max Rieckmann, … , Ulrich Hofmann, Gustavo Campos Ramos
Max Rieckmann, … , Ulrich Hofmann, Gustavo Campos Ramos
Published August 13, 2019
Citation Information: J Clin Invest. 2019. https://doi.org/10.1172/JCI123859.
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Myocardial infarction triggers cardioprotective antigen-specific T helper cell responses

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Abstract

T cell autoreactivity is a hallmark of autoimmune diseases but can also benefit self-maintenance and foster tissue repair. Herein, we investigated whether heart-specific T cells exert salutary or detrimental effects in the context of myocardial infarction (MI), the leading cause of death worldwide. After screening more than 150 class-II-restricted epitopes, we found that myosin heavy chain alpha (MYHCA) was a dominant cardiac antigen triggering post-MI CD4+ T cell activation in mice. Transferred MYHCA614-629-specific CD4+ T (TCR-M) cells selectively accumulated in the myocardium and mediastinal lymph nodes (med-LN) of infarcted mice, acquired a Treg phenotype with a distinct pro-healing gene expression profile, and mediated cardioprotection. Myocardial Treg cells were also detected in autopsies from patients who suffered a MI. Noninvasive PET/CT imaging using a CXCR4 radioligand revealed enlarged med-LNs with increased cellularity in MI-patients. Notably, the med-LN alterations observed in MI patients correlated with the infarct size and cardiac function. Taken together, the results obtained in our study provide evidence showing that MI-context induces pro-healing T cell autoimmunity in mice and confirms the existence of an analogous heart/med-LN/T cell axis in MI patients.

Authors

Max Rieckmann, Murilo Delgobo, Chiara Gaal, Lotte Büchner, Philipp Steinau, Dan Reshef, Cristina Gil-Cruz, Ellis N. ter Horst, Malte Kircher, Theresa Reiter, Katrin G. Heinze, Hans W.M. Niessen, Paul A.J. Krijnen, Anja M. van der Laan, Jan J. Piek, Charlotte Koch, Hans-Jürgen Wester, Constantin Lapa, Wolfgang R. Bauer, Burkhard Ludewig, Nir Friedman, Stefan Frantz, Ulrich Hofmann, Gustavo Campos Ramos

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Ankyrin-B dysfunction predisposes to arrhythmogenic cardiomyopathy and is amenable to therapy
Jason D. Roberts, … , Melvin M. Scheinman, Peter J. Mohler
Jason D. Roberts, … , Melvin M. Scheinman, Peter J. Mohler
Published July 2, 2019
Citation Information: J Clin Invest. 2019. https://doi.org/10.1172/JCI125538.
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Ankyrin-B dysfunction predisposes to arrhythmogenic cardiomyopathy and is amenable to therapy

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Abstract

Arrhythmogenic cardiomyopathy (ACM) is an inherited arrhythmia syndrome characterized by severe structural and electrical cardiac phenotypes, including myocardial fibrofatty replacement and sudden cardiac death. Clinical management of ACM is largely palliative, owing to an absence of therapies that target its underlying pathophysiology, which stems partially from our limited insight into the condition. Following identification of deceased ACM probands possessing ANK2 rare variants and evidence of ankyrin-B loss of function on cardiac tissue analysis, an ANK2 mouse model was found to develop dramatic structural abnormalities reflective of human ACM, including biventricular dilation, reduced ejection fraction, cardiac fibrosis, and premature death. Desmosomal structure and function appeared preserved in diseased human and murine specimens in the presence of markedly abnormal β-catenin expression and patterning, leading to identification of a previously unknown interaction between ankyrin-B and β-catenin. A pharmacological activator of the WNT/β-catenin pathway, SB-216763, successfully prevented and partially reversed the murine ACM phenotypes. Our findings introduce what we believe to be a new pathway for ACM, a role of ankyrin-B in cardiac structure and signaling, a molecular link between ankyrin-B and β-catenin, and evidence for targeted activation of the WNT/β-catenin pathway as a potential treatment for this disease.

Authors

Jason D. Roberts, Nathaniel P. Murphy, Robert M. Hamilton, Ellen R. Lubbers, Cynthia A. James, Crystal F. Kline, Michael H. Gollob, Andrew D. Krahn, Amy C. Sturm, Hassan Musa, Mona El-Refaey, Sara Koenig, Meriam Åström Aneq, Edgar T. Hoorntje, Sharon L. Graw, Robert W. Davies, Muhammad Arshad Rafiq, Tamara T. Koopmann, Shabana Aafaqi, Meena Fatah, David A. Chiasson, Matthew R.G. Taylor, Samantha L. Simmons, Mei Han, Chantal J.M. van Opbergen, Loren E. Wold, Gianfranco Sinagra, Kirti Mittal, Crystal Tichnell, Brittney Murray, Alberto Codima, Babak Nazer, Duy T. Nguyen, Frank I. Marcus, Nara Sobriera, Elisabeth M. Lodder, Maarten P. van den Berg, Danna A. Spears, John F. Robinson, Philip C. Ursell, Anna K. Green, Allan C. Skanes, Anthony S. Tang, Martin J. Gardner, Robert A. Hegele, Toon A.B. van Veen, Arthur A. M. Wilde, Jeff S. Healey, Paul M. L. Janssen, Luisa Mestroni, J. Peter van Tintelen, Hugh Calkins, Daniel P. Judge, Thomas J. Hund, Melvin M. Scheinman, Peter J. Mohler

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