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lüll Mechanisms and consequences of macrophage apoptosis in atherosclerosis Seimon T; Tabas IJ Lipid Res 2009[Apr]; 50 Suppl (Suppl): S382-7Macrophage apoptosis is an important feature of atherosclerotic plaque development. Research directed at understanding the functional consequences of macrophage death in atherosclerosis has revealed opposing roles for apoptosis in atherosclerotic plaque progression. In early lesions, macrophage apoptosis limits lesion cellularity and suppresses plaque progression. In advanced lesions, macrophages apoptosis promotes the development of the necrotic core, a key factor in rendering plaques vulnerable to disruption and in acute lumenal thrombosis. The first section of this review will examine the role of phagocytic clearance of apoptotic macrophages, a process known as efferocytosis, in the dichotomous roles of macrophage apoptosis in early vs. advanced lesions. The second section will focus on the molecular and cellular mechanisms that are thought to govern macrophage death during atherosclerosis. Of particular interest is the complex and coordinated role that the endoplasmic reticulum (ER) stress pathway and pattern recognition receptors (PRRs) may play in triggering macrophage apoptosis.|*Apoptosis[MESH]|Animals[MESH]|Atherosclerosis/genetics/metabolism/*pathology[MESH]|Endoplasmic Reticulum/metabolism[MESH]|Macrophages/*cytology/metabolism[MESH]|Receptors, Pattern Recognition/metabolism[MESH] |