Proliferation and Recruitment Contribute to Myocardial Macrophage Expansion in Chronic Heart Failure
Access StatusFull text of the requested work is not available in DASH at this time ("dark deposit"). For more information on dark deposits, see our FAQ.
Sager, Hendrik B.
Lavine, Kory J.
Moreira, Marina B.
Khan, Omar F.
Dahlman, James E.
MetadataShow full item record
CitationSager, Hendrik B., Maarten Hulsmans, Kory J. Lavine, Marina B. Moreira, Timo Heidt, Gabriel Courties, Yuan Sun, et al. 2016. “Proliferation and Recruitment Contribute to Myocardial Macrophage Expansion in Chronic Heart FailureNovelty and Significance.” Circulation Research 119 (7) (July 21): 853–864. doi:10.1161/circresaha.116.309001.
AbstractRationale: Macrophages reside in the healthy myocardium, participate in ischemic heart disease, and modulate myocardial infarction (MI) healing. Their origin and roles in post-MI remodeling of nonischemic remote myocardium, however, remain unclear.
Objective: This study investigated the number, origin, phenotype, and function of remote cardiac macrophages residing in the nonischemic myocardium in mice with chronic heart failure after coronary ligation.
Methods and Results: Eight weeks post MI, fate mapping and flow cytometry revealed that a 2.9-fold increase in remote macrophages results from both increased local macrophage proliferation and monocyte recruitment. Heart failure produced by extensive MI, through activation of the sympathetic nervous system, expanded medullary and extramedullary hematopoiesis. Circulating Ly6Chigh monocytes rose from 64±5 to 108±9 per microliter of blood (P<0.05). Cardiac monocyte recruitment declined in Ccr2−/− mice, reducing macrophage numbers in the failing myocardium. Mechanical strain of primary murine and human macrophage cultures promoted cell cycle entry, suggesting that the increased wall tension in post-MI heart failure stimulates local macrophage proliferation. Strained cells activated the mitogen-activated protein kinase pathway, whereas specific inhibitors of this pathway reduced macrophage proliferation in strained cell cultures and in the failing myocardium (P<0.05). Steady-state cardiac macrophages, monocyte-derived macrophages, and locally sourced macrophages isolated from failing myocardium expressed different genes in a pattern distinct from the M1/M2 macrophage polarization paradigm. In vivo silencing of endothelial cell adhesion molecules curbed post-MI monocyte recruitment to the remote myocardium and preserved ejection fraction (27.4±2.4 versus 19.1±2%; P<0.05).
Conclusions: Myocardial failure is influenced by an altered myeloid cell repertoire.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:28979888
- HMS Scholarly Articles