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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Alteration of a macrophages inflammatory protein-related protein-2 (MRP-2) response by high fat and cholesterol diet in mice.

Macrophage inflammatory protein-related protein-2 (MRP-2) is a new member of the CC chemokine family that is recently identified in murine macrophages. MRP-2 is involved in leukocyte trafficking and activation, which can be implicated in inflammatory diseases including atherosclerosis. Little is known about the involvement of this novel chemokine MRP-2 in the pathogenesis of atherosclerosis. To explore the possible association of the MRP-2 with atherosclerosis, we investigated the effects of atherogenic diet on MRP-2 expression in mice. Male C57BL/6 mice were fed a high fat and cholesterol diet (20% fat and 1.5% cholesterol) or a control diet based on AIN-76 for 5, 10, or 14 weeks. The levels of total cholesterol, LDL cholesterol, and F2-isoprostanes in plasma were measured using appropriate enzymatic assays. Tumor necrosis factor alpha (TNF alpha) and MCP-1 release by peritoneal macrophages was determined by ELISA. The mRNA expression level of the MRP-2 was measured by RT-PCR. The levels of total cholesterol, LDL-cholesterol, and 8-iso-prostaglandin F2 alpha in plasma, well-known indexes of atherosclerosis, were significantly increased in the high fat and cholesterol diet group compared to those in the control. A significant increase in the TNF alpha and MCP-1 production by macrophages was also observed in the group fed high fat and cholesterol diet. The mRNA expression of MRP-2 was upregulated by oxLDL treatment in vitro and feeding a high fat and cholesterol diet in vivo at the late stage of atherosclerosis. These results suggest that MRP-2 may be an important contributing factor in the development of atherosclerosis.[1]


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