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Macrophage neuronal nitric oxide synthase (NOS1) controls the inflammatory response and foam cell formation in atherosclerosis.
International Immunopharmacology 2020 March 17
Vascular inflammation plays a decisive role in the formation of foam cells and in the pathophysiology of atherosclerosis. However, the underlying mechanisms of these processes are not clearly understood. Macrophages engulf oxidized low-density lipoproteins (OxLDLs) via a scavenger receptor (SR), an event that mediates the elaboration of proinflammatory cytokines to initiate necrotic core formation in atherogenic plaques. In this study, we demonstrate that Nitric oxide synthase 1 (NOS1)-derived nitric oxide (NO) promotes OxLDL uptake and enhances the release of proinflammatory cytokines by macrophages. Conversely, we show that NOS1 inhibition by N(G)-nitro-L-arginine methyl ester (L-NAME) suppresses OxLDL uptake and proinflammatory cytokine expression. Current studies indicate that NOS1 plays a crucial role in vascular inflammation and in the progression of atherosclerosis. Therefore, interference with NOS1 enzymatic activity should serve as an effective strategy to reduce foam cell formation and limit the extent of atherosclerotic plaque expansion.
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