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Single-cell RNA sequencing analysis reveals a crucial role for CTHRC1 (collagen triple helix repeat containing 1) cardiac fibroblasts after myocardial infarction

Autores: Ruiz Villalba, Adrián; Romero, J. P.; Hernández Velasco, Silvia Clara; Vilas Zornoza, Amaia; Fortelny, N.; Castro-Labrador, L.; San Martín Úriz, Patxi; Lorenzo Vivas, Erika; García Olloqui, Paula; Palacio Solis, Marcel Ernesto; Gavira Gómez, Juan José; Bastarrika Alemañ, Gorka; Janssens, S. ; Wu, M. ; Iglesias López, Elena; Abizanda Sarasa, Gloria María; Martínez de Morentín, X.; Lasaga, M. ; Planell, N. ; Bock, C. ; Alignani, Diego Oscar; Medal, G. ; Prudovsky, I. ; Jin, Y. R. ; Ryzhov, S. ; Yin, H. F. ; Pelacho Samper, Beatriz; Gomez-Cabrero, D. ; Lindner, V. ; LARA ASTIASO, David; Prosper Cardoso, Felipe (Autor de correspondencia)
Título de la revista: CIRCULATION
ISSN: 0009-7322
Volumen: 142
Número: 19
Páginas: 1831 - 1847
Fecha de publicación: 2020
BACKGROUND: Cardiac fibroblasts (CFs) have a central role in the ventricular remodeling process associated with different types of fibrosis. Recent studies have shown that fibroblasts do not respond homogeneously to heart injury. Because of the limited set of bona fide fibroblast markers, a proper characterization of fibroblast population heterogeneity in response to cardiac damage is lacking. The purpose of this study was to define CF heterogeneity during ventricular remodeling and the underlying mechanisms that regulate CF function. METHODS: Collagen1 alpha 1-GFP (green fluorescent protein)-positive CFs were characterized after myocardial infarction (MI) by single-cell and bulk RNA sequencing, assay for transposase-accessible chromatin sequencing, and functional assays. Swine and patient samples were studied using bulk RNA sequencing. RESULTS: We identified and characterized a unique CF subpopulation that emerges after MI in mice. These activated fibroblasts exhibit a clear profibrotic signature, express high levels of Cthrc1 (collagen triple helix repeat containing 1), and localize into the scar. Noncanonical transforming growth factor-beta signaling and different transcription factors including SOX9 are important regulators mediating their response to cardiac injury. Absence of CTHRC1 results in pronounced lethality attributable to ventricular rupture. A population of CFs with a similar transcriptome was identified in a swine model of MI and in heart tissue from patients with MI and dilated cardiomyopathy. CONCLUSIONS: We report CF heterogeneity and their dynamics during the course of MI and redefine the CFs that respond to cardiac injury and participate in myocardial remodeling. Our study identifies CTHRC1 as a novel regulator of the healing scar process and a target for future translational studies.