开放访问
Giancarlo Bianchi,Giovanna d'Amico,Luisella Varone,Silvano Sozzani,Alberto Mantovania,Paola Allavena那 “通过内皮细胞和外细胞基质对树突细胞进行贩运的体外研究“,免疫学研究杂志那 卷。7.那 文章ID.039893那 11. 页面那 2000年。 https://doi.org/10.1155/2000/39893
通过内皮细胞和外细胞基质对树突细胞进行贩运的体外研究
抽象的
树突状细胞(DC)是抗原呈递细胞(APC),其具有引发免疫应答的独特能力。未成熟的DC在外围组织中局部化,在那里它们施加用于进入抗原的哨兵函数(AG)。在Ag捕获和暴露于炎症刺激DC后经过成熟并迁移到区域淋巴结,其中发生抗原肽对T淋巴细胞的呈现。因此,随着APC的正确功能涉及组织中的本地化,通过淋巴或血液贩运到淋巴器官。在本研究中,我们研究了DC与人类血管内皮细胞(EC)和细胞外基质(ECM)相互作用的能力。通过体外暴露于GM-CSF和IL-13,将DC与单核细胞相差7天。在粘合性中,测定相当大比例的DC与静止的EC单层结合,并且该粘附力被抗CD11a和CD11b抑制,但不抗CD11C mAb抑制。衍生自培养的EC的天然ECM结合涉及VLA-4和VLA-5整合蛋白。在迁移测定中,10%的输入细胞能够在没有外源刺激的情况下穿过EC单层。通过EC的单层翻转的DC的量增加2-3倍,C-C趋化因子咆哮,MIP1α和MIP-1β。 Most importantly, in view of the trafficking pattern of these cells, a significant proportion of DC can migrate in a reverse transmigration assay, i.e. across the endothelial basement membrane and subsequently, across endothelial cells. Upon exposure to immune or inflammatory signals peripheral DC undergo maturation and migration to lymphoid organs. Functional maturation is associated with loss of responsiveness to chemokines present at sites of inflammation (e.g. MIP1α, MIP1β and RANTES) and acquisition of a receptor repertoire which renders these cells responsive to signals which guide their localization in lymphoid organs (e.g. MIP3β). A better understanding of the molecular basis of DC trafficking may provide molecular and conceptual tools to direct and modulate DC localization as a strategy to upregulate and orient specific immunity.
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