کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5947537 | 1172371 | 2012 | 8 صفحه PDF | دانلود رایگان |

ObjectiveAtherosclerosis (AS) is widely accepted as an inflammatory disease and monocytes are particularly important in inflammatory immune responses. As an important biomarker of monocytes activation, Siglec-1 is highly expressed on circulating monocytes and atherosclerotic plaques of coronary artery disease (CAD) patients, but the exact role of Siglec-1 has not been elucidated.MethodsM-CSF, INF-α, IFN-γ, TNF-α and ox-LDL alone or in combination were used to stimulate Siglec-1 expression on monocytes, whereas small interfering RNA (si-RNA) or blocking antibody was used to down-regulate Siglec-1. Meanwhile, the role of Siglec-1 in chemokines secretion was determined. Then monocytes from CAD patients or healthy controls were cocultured with CD4+ or CD8+ T cells from a third healthy individual, and lymphocyte proliferation and activation were determined.ResultsAll the stimuluses could enhance Siglec-1 expression on monocytes in a dose-dependent manner, and M-CSF could synergistically stimulate Siglec-1 expression with ox-LDL. Moreover, the secretion of MCP-1, MIP-1α and MIP-2 were enhanced when Siglec-1 was up-regulated and down to normal level when Siglec-1 was blocked. More importantly, increased Siglec-1 expression on monocytes was related to the increased T cell proliferation and pro-inflammatory cytokines secretion in CAD patients. However, down-regulation of Siglec-1 could attenuate proliferation and activation of cocultured CD4+ and CD8+ T cells.ConclusionSiglec-1 can promote chemokines and pro-inflammatory cytokines secretion and influence the inflammatory process of AS.
⸠Siglec-1 is expressed in atherosclerotic plaque of ApoEâ/â mice. ⸠M-CSF, INF-α, IFN-γ, TNF-α and ox-LDL can up-regulate Siglec-1 expression. â¸Â Blockage of Siglec-1 can attenuate ox-LDL induced MCP-1, MIP-1 and MIP-2 expression. ⸠Siglec-1 has a positive role in stimulating both CD4+ and CD8+ T cells proliferation. ⸠Siglec-1 can stimulate pro-inflammatory cytokines secretion in cocultured CD4 cells.
Journal: Atherosclerosis - Volume 224, Issue 1, September 2012, Pages 58-65