LIGHT regulates inflamed draining lymph node hypertrophy.

LIGHT regulates inflamed draining lymph node hypertrophy.
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光调节发炎引流淋巴结肥大

DOI:
10.4049/jimmunol.1002097
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发表时间:
2011-06-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Fu YX
Fu YX
中科院分区:
其他
文献类型:
--
作者:
Zhu M;Yang Y;Wang Y;Wang Z;Fu YX

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淋巴结 (LN) 肥大(LN 细胞结构增加)是针对感染、疫苗接种、癌症或自身免疫的免疫反应启动和扩展的主要指标。淋巴结肥大的机制仍不清楚。在本文中,我们证明 LIGHT(与淋巴毒素同源,表现出诱导型表达,并与 HSV 糖蛋白 D 竞争 HVEM,淋巴细胞表达的受体)(TNFSF14) 是 CFA 免疫后 LN 肥大所必需的新因子。从机制上讲,淋巴细胞流入淋巴结而不是从淋巴结流出需要光。此外,树突状细胞从皮肤迁移到引流淋巴结需要光。与野生型小鼠相比,CFA免疫后,LIGHT−/−小鼠皮肤中的趋化因子和LN血管内皮细胞中的地址素表达水平较低。我们出乎意料地观察到,LN 肥大需要来自抗辐射细胞而不是辐射敏感细胞(可能是朗格汉斯细胞)的光。重要的是,Ag特异性T细胞反应在LIGHT−/−小鼠的LN引流中受损,这表明LIGHT调节LN肥大在适应性免疫反应的产生中的重要性。总的来说,我们的数据揭示了一种调节 LN 肥大的新细胞和分子机制及其对产生最佳适应性免疫反应的潜在影响。
Lymph node (LN) hypertrophy, the increased cellularity of LNs, is the major indication of the initiation and expansion of the immune response against infection, vaccination, cancer, or autoimmunity. The mechanisms underlying LN hypertrophy remain poorly defined. In this article, we demonstrate that LIGHT (homologous to lymphotoxins, exhibits inducible expression, and competes with HSV glycoprotein D for HVEM, a receptor expressed by lymphocytes) (TNFSF14) is a novel factor essential for LN hypertrophy after CFA immunization. Mechanistically, LIGHT is required for the influx of lymphocytes into but not egress out of LNs. In addition, LIGHT is required for dendritic cell migration from the skin to draining LNs. Compared with wild type mice, LIGHT−/− mice express lower levels of chemokines in skin and addressins in LN vascular endothelial cells after CFA immunization. We unexpectedly observed that LIGHT from radioresistant rather than radiosensitive cells, likely Langerhans cells, is required for LN hypertrophy. Importantly, Ag-specific T cell responses were impaired in draining LNs of LIGHT−/− mice, suggesting the importance of LIGHT regulation of LN hypertrophy in the generation of an adaptive immune response. Collectively, our data reveal a novel cellular and molecular mechanism for the regulation of LN hypertrophy and its potential impact on the generation of an optimal adaptive immune response.
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