RT Journal Article T1 A Novel Circulating Noncoding Small RNA for the Detection of Acute Myocarditis A1 Blanco Domínguez, Rafael A1 Sánchez Díaz, Raquel A1 Fuente, Hortensia de la A1 Jiménez Borreguero, Luis J. A1 Matesanz Marín, Adela A1 Relaño, Marta A1 Jiménez Alejandre, Rosa A1 Linillos Pradillo, Beatriz A1 Tsilingiri, Katerina A1 Martín-Mariscal, María L. A1 Alonso Herranz, Laura A1 Moreno Muñoz, Guillermo A1 Martín Asenjo, Roberto A1 García Guimaraes, Marcos M. A1 Bruno, Katelyn A. A1 Dauden, Esteban A1 González Álvaro, Isidoro A1 Villar Guimerans, Luisa M. A1 Martínez León, Amaia A1 Salvador Garicano. Ane M., A1 Michelhaugh, Sam A. A1 Ibrahim, Nasrien E. A1 Januzzi, James L. A1 Kottwitz, Jan A1 Iliceto, Sabino A1 Plebani, Mario A1 Basso, Cristina A1 Baritussio, Anna A1 Seguso, Mara A1 Marcolongo, Renzo A1 Ricote, Mercedes A1 Fairweather, DeLisa A1 Bueno Zamora, Héctor José A1 Fernández Friera, Leticia A1 Alfonso Manterola, Fernando A1 Caforio, Alida L.P. A1 Pascual Figal, Domingo A. A1 Heidecker, Bettina A1 Lüscher, Thomas F. A1 Das, Saumya A1 Fuster, Valentín A1 Ibáñez, Borja A1 Sánchez Madrid, Francisco A1 Martín, Pilar AB The 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. METHODS To 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. RESULTS We 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. CONCLUSIONS After 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. PB NEJM Group SN 0028-4793 SN 1533-4406 YR 2021 FD 2021-05-26 LK https://hdl.handle.net/20.500.14352/109742 UL https://hdl.handle.net/20.500.14352/109742 LA eng NO Blanco-Domínguez R, Sánchez-Díaz R, de la Fuente H, Jiménez-Borreguero LJ, Matesanz-Marín A, Relaño M, et al. A novel circulating microRNA for the detection of acute myocarditis. New England Journal of Medicine. 2021;384(21):2014-27. DS Docta Complutense RD 10 abr 2025