期刊
JOURNAL OF CLINICAL INVESTIGATION
卷 122, 期 9, 页码 3114-3126出版社
AMER SOC CLINICAL INVESTIGATION INC
DOI: 10.1172/JCI61758
关键词
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资金
- NIH [HL58108]
- American Heart Association [10POST4160142-01]
- Deutsche Forschungsgemeinschaft
Atherosclerosis is a chronic inflammatory disease of large and medium-sized arteries characterized by leukocyte accumulation in the vessel wall. Both innate and adaptive immune responses contribute to atherogenesis, but the identity of atherosclerosis-relevant antigens and the role of antigen presentation in this disease remain poorly characterized. We developed live-cell imaging of explanted aortas to compare the behavior and role of APCs in normal and atherosclerotic mice. We found that CD4(+) T cells were capable of interacting with fluorescently labeled (CD11c-YFP+) APCs in the aortic wall in the presence, but not the absence, of cognate antigen. In atherosclerosis-prone Apoe(-/-)CD11c-YFP+ mice, APCs extensively interacted with CD4(+) T cells in the aorta, leading to cell activation and proliferation as well as secretion of IFN-gamma and TNF-alpha. These cytokines enhanced uptake of oxidized and minimally modified LDL by macrophages. We conclude that antigen presentation by APCs to CD4(+) T cells in the arterial wall causes local T cell activation and production of proinflammatory cytokines, which promote atherosclerosis by maintaining chronic inflammation and inducing foam cell formation.
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