Flacher Vincent, Tripp Christoph H, Mairhofer David G, Steinman Ralph M, Stoitzner Patrizia, Idoyaga Juliana, Romani Nikolaus
Department of Dermatology and Venereology, Innsbruck Medical University, Innsbruck, Austria Oncotyrol Center for Personalized Cancer Medicine, Innsbruck, Austria.
Department of Dermatology and Venereology, Innsbruck Medical University, Innsbruck, Austria.
EMBO Mol Med. 2014 Sep;6(9):1191-204. doi: 10.15252/emmm.201303283.
Skin dendritic cells (DCs) control the immunogenicity of cutaneously administered vaccines. Antigens targeted to DCs via the C-type lectin Langerin/CD207 are cross-presented to CD8(+) T cells in vivo. We investigated the relative roles of Langerhans cells (LCs) and Langerin(+) dermal DCs (dDCs) in different vaccination settings. Poly(I:C) and anti-CD40 agonist antibody promoted cytotoxic responses upon intradermal immunization with ovalbumin (OVA)-coupled anti-Langerin antibodies (Langerin/OVA). This correlated with CD70 upregulation in Langerin(+) dDCs, but not LCs. In chimeric mice where Langerin targeting was restricted to dDCs, CD8(+) T-cell memory was enhanced. Conversely, providing Langerin/OVA exclusively to LCs failed to prime cytotoxicity, despite initial antigen cross-presentation to CD8(+) T cells. Langerin/OVA combined with imiquimod could not prime CD8(+) T cells and resulted in poor cytotoxicity in subsequent responses. This tolerance induction required targeting and maturation of LCs. Altogether, Langerin(+) dDCs prime long-lasting cytotoxic responses, while cross-presentation by LCs negatively influences CD8(+) T-cell priming. Moreover, this highlights that DCs exposed to TLR agonists can still induce tolerance and supports the existence of qualitatively different DC maturation programs.
皮肤树突状细胞(DCs)控制经皮接种疫苗的免疫原性。通过C型凝集素Langerin/CD207靶向DCs的抗原在体内可交叉呈递给CD8(+) T细胞。我们研究了朗格汉斯细胞(LCs)和Langerin(+)真皮DCs(dDCs)在不同疫苗接种环境中的相对作用。聚肌胞苷酸(Poly(I:C))和抗CD40激动剂抗体在用卵清蛋白(OVA)偶联抗Langerin抗体(Langerin/OVA)进行皮内免疫时可促进细胞毒性反应。这与Langerin(+) dDCs中CD70上调相关,但与LCs无关。在Langerin靶向仅限于dDCs的嵌合小鼠中,CD8(+) T细胞记忆增强。相反,尽管最初抗原可交叉呈递给CD8(+) T细胞,但仅向LCs提供Langerin/OVA未能引发细胞毒性。Langerin/OVA与咪喹莫特联合使用不能引发CD8(+) T细胞反应,且在后续反应中细胞毒性较差。这种耐受性诱导需要LCs的靶向和成熟。总之,Langerin(+) dDCs引发持久的细胞毒性反应,而LCs的交叉呈递对CD8(+) T细胞的启动产生负面影响。此外,这突出表明暴露于Toll样受体(TLR)激动剂的DCs仍可诱导耐受性,并支持存在性质不同种类的DC成熟程序。
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