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Local proliferation dominates lesional macrophage accumulation in atherosclerosis Robbins CS; Hilgendorf I; Weber GF; Theurl I; Iwamoto Y; Figueiredo JL; Gorbatov R; Sukhova GK; Gerhardt LM; Smyth D; Zavitz CC; Shikatani EA; Parsons M; van Rooijen N; Lin HY; Husain M; Libby P; Nahrendorf M; Weissleder R; Swirski FKNat Med 2013[Sep]; 19 (9): 1166-72During the inflammatory response that drives atherogenesis, macrophages accumulate progressively in the expanding arterial wall. The observation that circulating monocytes give rise to lesional macrophages has reinforced the concept that monocyte infiltration dictates macrophage buildup. Recent work has indicated, however, that macrophage accumulation does not depend on monocyte recruitment in some inflammatory contexts. We therefore revisited the mechanism underlying macrophage accumulation in atherosclerosis. In murine atherosclerotic lesions, we found that macrophages turn over rapidly, after 4 weeks. Replenishment of macrophages in these experimental atheromata depends predominantly on local macrophage proliferation rather than monocyte influx. The microenvironment orchestrates macrophage proliferation through the involvement of scavenger receptor A (SR-A). Our study reveals macrophage proliferation as a key event in atherosclerosis and identifies macrophage self-renewal as a therapeutic target for cardiovascular disease.|*Cell Proliferation[MESH]|Animals[MESH]|Atherosclerosis/*immunology/*pathology[MESH]|Cells, Cultured[MESH]|Inflammation[MESH]|Macrophages/immunology/*physiology[MESH]|Mice[MESH]|Mice, Inbred C57BL[MESH]|Mice, Knockout[MESH]|Monocytes/physiology[MESH] |
