Functional redundancy of Langerhans cells and Langerin+ dermal dendritic cells in contact hypersensitivity.

Functional redundancy of Langerhans cells and Langerin+ dermal dendritic cells in contact hypersensitivity.
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接触性超敏反应中朗格汉斯细胞和朗格林+真皮树突状细胞的功能冗余。

DOI:
10.1038/jid.2010.223
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发表时间:
2010-12
期刊:
The Journal of investigative dermatology
影响因子:
--
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中科院分区:
其他
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朗格汉斯细胞(LC)、真皮树突状细胞(DC),特别是最近发现的Langerhans+真皮DC亚群在诱导和控制接触性超敏反应(CHS)中的相对作用仍存在争议。在一个可诱导的小鼠模型中,LC和其他Langerin+DC可以通过注射白喉毒素来耗尽,我们先前报告了局部应用的抗原到引流淋巴结的运输受损,并且在没有全部Langerin+皮肤DC的情况下CHS减少。在这项研究中,我们证明了选择性耗尽LC的小鼠只在低半抗原剂量致敏时才表现出减弱的CHS,而不是高半抗原剂量时。相反,当在皮肤上涂抹更高浓度的半抗原,导致抗原扩散到真皮时,缺乏所有Langerin+皮肤DC的小鼠的CHS仍然减少。综上所述,这些数据表明CHS反应的大小取决于能够接触到半抗原的皮肤DC的数量,而不是特定皮肤DC群体的存在或不存在。因此,LC和(Langerin+)真皮DC似乎在调节CHS方面具有多余的功能。
The relative roles of Langerhans cells (LC), dermal dendritic cells (DC), and, in particular, the recently discovered Langerin+ dermal DC subset in the induction and control of contact hypersensitivity (CHS) responses remain controversial. Using an inducible mouse model, in which LC and other Langerin+ DC can be depleted by injection of diphtheria toxin, we previously reported impaired transport of topically applied antigen to draining lymph nodes and reduced CHS in the absence of all Langerin+ skin DC. In this study, we demonstrate that mice with a selective depletion of LC exhibit attenuated CHS only upon sensitization with a low hapten dose but not with a high hapten dose. In contrast, when painting a higher concentration of hapten onto the skin, which leads to increased antigen dissemination into the dermis, CHS is still diminished in mice lacking all Langerin+ skin DC. Taken together, these data suggest that the magnitude of a CHS reaction depends on the number of skin DC, which have access to the hapten, rather than on the presence or absence of a particular skin DC population. LC and (Langerin+) dermal DC thus seem to have a redundant function in regulating CHS.
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