Thomas Moore-Morris1, Paola Cattaneo1, Nuno Guimarães-Camboa1, Julius Bogomolovas1, Marta Cedenilla1, Indroneal Banerjee1, Mercedes Ricote1, Tatiana Kisseleva1, Lunfeng Zhang1, Yusu Gu1, Nancy D Dalton1, Kirk L Peterson1, Ju Chen1, Michel Pucéat1, Sylvia M Evans2. 1. From the Aix Marseille Univ, INSERM, UMR_S910, GMGF, France (T.M.-M., M.P.); Skaggs School of Pharmacy and Pharmaceutical Sciences (P.C., N.G.-C., L.Z., S.M.E.), Department of Medicine (J.B., Y.G., N.D.D., K.L.P., J.C., S.M.E.), and Department of Pharmacology (I.B., S.M.E.), University of California at San Diego, La Jolla; National Research Council, Institute of Genetics and Biomedical Research, Milan Unit, Italy (P.C.); Humanitas Clinical and Research Center, Rozzano (MI), Italy (P.C.); and Cardiovascular Development and Repair Department, Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain (M.C., M.R.). 2. From the Aix Marseille Univ, INSERM, UMR_S910, GMGF, France (T.M.-M., M.P.); Skaggs School of Pharmacy and Pharmaceutical Sciences (P.C., N.G.-C., L.Z., S.M.E.), Department of Medicine (J.B., Y.G., N.D.D., K.L.P., J.C., S.M.E.), and Department of Pharmacology (I.B., S.M.E.), University of California at San Diego, La Jolla; National Research Council, Institute of Genetics and Biomedical Research, Milan Unit, Italy (P.C.); Humanitas Clinical and Research Center, Rozzano (MI), Italy (P.C.); and Cardiovascular Development and Repair Department, Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain (M.C., M.R.). syevans@ucsd.edu.
Abstract
RATIONALE: Myocardial infarction is a major cause of adult mortality worldwide. The origin(s) of cardiac fibroblasts that constitute the postinfarct scar remain controversial, in particular the potential contribution of bone marrow lineages to activated fibroblasts within the scar. OBJECTIVE: The aim of this study was to establish the origin(s) of infarct fibroblasts using lineage tracing and bone marrow transplants and a robust marker for cardiac fibroblasts, the Collagen1a1-green fluorescent protein reporter. METHODS AND RESULTS: Using genetic lineage tracing or bone marrow transplant, we found no evidence for collagen-producing fibroblasts derived from hematopoietic or bone marrow lineages in hearts subjected to permanent left anterior descending coronary artery ligation. In fact, fibroblasts within the infarcted area were largely of epicardial origin. Intriguingly, collagen-producing fibrocytes from hematopoietic lineages were observed attached to the epicardial surface of infarcted and sham-operated hearts in which a suture was placed around the left anterior descending coronary artery. CONCLUSIONS: In this controversial field, our study demonstrated that the vast majority of infarct fibroblasts were of epicardial origin and not derived from bone marrow lineages, endothelial-to-mesenchymal transition, or blood. We also noted the presence of collagen-producing fibrocytes on the epicardial surface that resulted at least in part from the surgical procedure.
RATIONALE: Myocardial infarction is a major cause of adult mortality worldwide. The origin(s) of cardiac fibroblasts that constitute the postinfarct scar remain controversial, in particular the potential contribution of bone marrow lineages to activated fibroblasts within the scar. OBJECTIVE: The aim of this study was to establish the origin(s) of infarct fibroblasts using lineage tracing and bone marrow transplants and a robust marker for cardiac fibroblasts, the Collagen1a1-green fluorescent protein reporter. METHODS AND RESULTS: Using genetic lineage tracing or bone marrow transplant, we found no evidence for collagen-producing fibroblasts derived from hematopoietic or bone marrow lineages in hearts subjected to permanent left anterior descending coronary artery ligation. In fact, fibroblasts within the infarcted area were largely of epicardial origin. Intriguingly, collagen-producing fibrocytes from hematopoietic lineages were observed attached to the epicardial surface of infarcted and sham-operated hearts in which a suture was placed around the left anterior descending coronary artery. CONCLUSIONS: In this controversial field, our study demonstrated that the vast majority of infarct fibroblasts were of epicardial origin and not derived from bone marrow lineages, endothelial-to-mesenchymal transition, or blood. We also noted the presence of collagen-producing fibrocytes on the epicardial surface that resulted at least in part from the surgical procedure.
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