Department of Immunotechnology, Lund University, Lund, Sweden.
Immunology. 2014 Jun;142(2):279-88. doi: 10.1111/imm.12252.
Dendritic cells (DCs) operate as the link between innate and adaptive immunity. Their expression of pattern recognition receptors (PRRs), such as Toll-like receptors (TLRs) and C-type lectin receptors (CLRs), enables antigen recognition and mediates appropriate immune responses. Distinct subsets of human DCs have been identified; however their expression of PRRs is not fully clarified. Expressions of CLRs by DC subpopulations, in particular, remain elusive. This study aimed to identify and compare PRR expressions on human blood DC subsets, including CD1c(+) , CD141(+) and CD16(+) myeloid DCs and CD123(+) plasmacytoid DCs, in order to understand their capacity to recognize different antigens as well as their responsiveness to PRR-directed targeting. Whole blood was obtained from 13 allergic and six non-allergic individuals. Mononuclear cells were purified and multi-colour flow cytometry was used to assess the expression of 10 CLRs and two TLRs on distinct DC subsets. PRR expression levels were shown to differ between DC subsets for each PRR assessed. Furthermore, principal component analysis and random forest test demonstrated that the PRR profiles were discriminative between DC subsets. Interestingly, CLEC9A was expressed at lower levels by CD141(+) DCs from allergic compared with non-allergic donors. The subset-specific PRR expression profiles suggests individual responsiveness to PRR-targeting and supports functional specialization.
树突状细胞 (DCs) 作为先天免疫和适应性免疫之间的联系。它们表达模式识别受体 (PRRs),如 Toll 样受体 (TLRs) 和 C 型凝集素受体 (CLRs),能够识别抗原并介导适当的免疫反应。已经鉴定出人类 DC 的不同亚群;然而,它们的 PRR 表达尚未完全阐明。特别是,DC 亚群的 CLR 表达仍然难以捉摸。本研究旨在鉴定和比较人类血液 DC 亚群(包括 CD1c(+)、CD141(+)和 CD16(+)髓样 DC 和 CD123(+)浆细胞样 DC)上的 PRR 表达,以了解它们识别不同抗原的能力以及对 PRR 靶向的反应性。从 13 名过敏患者和 6 名非过敏患者中获得全血。分离单核细胞并使用多色流式细胞术评估不同 DC 亚群上 10 种 CLR 和 2 种 TLR 的表达。结果表明,对于每种评估的 PRR,DC 亚群之间的 PRR 表达水平存在差异。此外,主成分分析和随机森林测试表明,PRR 谱可区分 DC 亚群。有趣的是,与非过敏供体相比,来自过敏患者的 CD141(+) DC 表达 CLEC9A 的水平较低。特定于亚群的 PRR 表达谱表明个体对 PRR 靶向的反应性不同,并支持功能专业化。