Institute of Clinical Microbiology, Immunology and Hygiene, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.
Department of Infectious Disease, St. Jude Children's Research Hospital, Memphis, TN, United States.
Front Immunol. 2022 May 2;13:880474. doi: 10.3389/fimmu.2022.880474. eCollection 2022.
Successful subunit vaccination with recombinant proteins requires adjuvants. The glycolipid trehalose-dibehenate (TDB), a synthetic analog of the mycobacterial cord factor, potently induces Th1 and Th17 immune responses and is a candidate adjuvant for human immunization. TDB binds to the C-type lectin receptor Mincle and triggers Syk-Card9-dependent APC activation. In addition, interleukin (IL)-1 receptor/MyD88-dependent signaling is required for TDB adjuvanticity. The role of different innate immune cell types in adjuvant-stimulated Th1/Th17 responses is not well characterized. We investigated cell recruitment to the site of injection (SOI) and to the draining lymph nodes (dLNs) after immunization with the TDB containing adjuvant CAF01 in a protein-based vaccine. Recruitment of monocytes and neutrophils to the SOI and the dramatic increase in lymph node cellularity was partially dependent on both Mincle and MyD88. Despite their large numbers at the SOI, neutrophils were dispensable for the induction of Th1/Th17 responses. In contrast, CCR2-dependent monocyte recruitment was essential for the induction of Th1/Th17 cells. Transport of adjuvant to the dLN did not require Mincle, MyD88, or CCR2. Together, adjuvanticity conferred by monocytes can be separated at the cellular level from potential tissue damage by neutrophils.
成功的亚单位疫苗接种需要佐剂。糖脂海藻糖二硬脂酸酯(TDB)是一种分枝杆菌 cord 因子的合成类似物,能强烈诱导 Th1 和 Th17 免疫反应,是人类免疫接种的候选佐剂。TDB 与 C 型凝集素受体 Mincle 结合,并触发 Syk-Card9 依赖性 APC 激活。此外,白细胞介素(IL)-1 受体/MyD88 依赖性信号通路是 TDB 佐剂作用所必需的。不同固有免疫细胞类型在佐剂刺激 Th1/Th17 反应中的作用尚未得到很好的描述。我们研究了在含有佐剂 CAF01 的 TDB 蛋白疫苗免疫后,细胞向注射部位(SOI)和引流淋巴结(dLNs)的募集情况。单核细胞和中性粒细胞向 SOI 的募集和淋巴结细胞数量的急剧增加部分依赖于 Mincle 和 MyD88。尽管在 SOI 处数量众多,但中性粒细胞对于诱导 Th1/Th17 反应是可有可无的。相比之下,CCR2 依赖性单核细胞的募集对于诱导 Th1/Th17 细胞是必不可少的。佐剂向 dLN 的转运不需要 Mincle、MyD88 或 CCR2。综上所述,单核细胞的佐剂作用可以在细胞水平上与其潜在的组织损伤区分开来。
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