• Rafael Blanco-Domínguez, Raquel Sánchez-Díaz, Hortensia de la Fuente, Luis J Jiménez-Borreguero, Adela Matesanz-Marín, Marta Relaño, Rosa Jiménez-Alejandre, Beatriz Linillos-Pradillo, Katerina Tsilingiri, María L Martín-Mariscal, Laura Alonso-Herranz, Guillermo Moreno, Roberto Martín-Asenjo, Marcos M García-Guimaraes, Katelyn A Bruno, Esteban Dauden, Isidoro González-Álvaro, Luisa M Villar-Guimerans, Amaia Martínez-León, Ane M Salvador-Garicano, Sam A Michelhaugh, Nasrien E Ibrahim, James L Januzzi, Jan Kottwitz, Sabino Iliceto, Mario Plebani, Cristina Basso, Anna Baritussio, Mara Seguso, Renzo Marcolongo, Mercedes Ricote, DeLisa Fairweather, Héctor Bueno, Leticia Fernández-Friera, Fernando Alfonso, CaforioAlida L PALPFrom the Vascular Pathophysiology Area (R.B.-D., R.S.-D., A.M.-M., M. Relaño, R.J.-A., B.L.-P., K.T., D.A.P.-F., V.F., F.S.-M., P.M.) and the Myocardial Pathophysiology Area (L.A.-H., M. Ricote, H.B., L.F.-F., B.I.), Centro Nacional de , Domingo A Pascual-Figal, Bettina Heidecker, Thomas F Lüscher, Saumya Das, Valentín Fuster, Borja Ibáñez, Francisco Sánchez-Madrid, and Pilar Martín.
• From the Vascular Pathophysiology Area (R.B.-D., R.S.-D., A.M.-M., M. Relaño, R.J.-A., B.L.-P., K.T., D.A.P.-F., V.F., F.S.-M., P.M.) and the Myocardial Pathophysiology Area (L.A.-H., M. Ricote, H.B., L.F.-F., B.I.), Centro Nacional de Investigaciones Cardiovasculares (CNIC), the Department of Immunology (H.F., F.S.-M.), the Department of Cardiology (L.J.J.-B., M.M.G.-G., F.A.), the Department of Dermatology (E.D.), and the Department of Rheumatology (I.G.-A.), Instituto de Investigación Sanitaria, Hospital Universitario de la Princesa, Fundación Jiménez Díaz (M.L.M.-M., B.I.), the Cardiology Department, Hospital Universitario 12 de Octubre, and Instituto de Investigación Sanitaria Hospital 12 de Octubre (G.M., R.M.-A., H.B.), the Department of Immunology, Hospital Ramón y Cajal (L.M.V.-G.), HM Hospitales-Centro Integral de Enfermedades Cardiovasculares (L.F.-F.), and CIBER de Enfermedades Cardiovasculares (R.S.-D., H.F., L.J.J.-B., F.A., D.A.P.-F., B.I., F.S.-M., P.M.), Madrid, Hospital Universitario Central de Asturias, Oviedo (A.M.-L.), and the Cardiology Department, Hospital Universitario Virgen de la Arrixaca, Murcia (D.A.P.-F.) - all in Spain; the Department of Cardiovascular Medicine, Mayo Clinic, Jacksonville, FL (K.A.B., D.F.); the Cardiovascular Division and Corrigan Minehan Heart Center, Massachusetts General Hospital, and Harvard Medical School, Boston (A.M.S.-G., S.A.M., N.E.I., J.L.J., S.D.); Kanntonsspital St. Gallen Klinik für Anesthesiologie und Intensivmedizin, St. Gallen, Switzerland (J.K.); Cardiology (S.I., A.B., A.L.P.C.) and the Cardiovascular Pathology Unit (C.B.), the Department of Cardiac, Thoracic, Vascular Sciences and Public Health, the Department of Laboratory Medicine (M.P., M.S.), and the Department of Medicine, Hematology and Clinical Immunology (R.M.), University of Padua, Padua, Italy; Charite Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin (B.H.); Imperial College and Royal Brompton and Harefield Hospital, London (T.F.L.); and the Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York (V.F.).
• N. Engl. J. Med. 2021 May 27; 384 (21): 201420272014-2027.

BackgroundThe diagnosis of acute myocarditis typically requires either endomyocardial biopsy (which is invasive) or cardiovascular magnetic resonance imaging (which is not universally available). Additional approaches to diagnosis are desirable. We sought to identify a novel microRNA for the diagnosis of acute myocarditis.MethodsTo identify a microRNA specific for myocarditis, we performed microRNA microarray analyses and quantitative polymerase-chain-reaction (qPCR) assays in sorted CD4+ T cells and type 17 helper T (Th17) cells after inducing experimental autoimmune myocarditis or myocardial infarction in mice. We also performed qPCR in samples from coxsackievirus-induced myocarditis in mice. We then identified the human homologue for this microRNA and compared its expression in plasma obtained from patients with acute myocarditis with the expression in various controls.ResultsWe confirmed that Th17 cells, which are characterized by the production of interleukin-17, are a characteristic feature of myocardial injury in the acute phase of myocarditis. The microRNA mmu-miR-721 was synthesized by Th17 cells and was present in the plasma of mice with acute autoimmune or viral myocarditis but not in those with acute myocardial infarction. The human homologue, designated hsa-miR-Chr8:96, was identified in four independent cohorts of patients with myocarditis. The area under the receiver-operating-characteristic curve for this novel microRNA for distinguishing patients with acute myocarditis from those with myocardial infarction was 0.927 (95% confidence interval, 0.879 to 0.975). The microRNA retained its diagnostic value in models after adjustment for age, sex, ejection fraction, and serum troponin level.ConclusionsAfter identifying a novel microRNA in mice and humans with myocarditis, we found that the human homologue (hsa-miR-Chr8:96) could be used to distinguish patients with myocarditis from those with myocardial infarction. (Funded by the Spanish Ministry of Science and Innovation and others.).Copyright © 2021 Massachusetts Medical Society.

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