The second and third amino acids of Pam2 lipopeptides are key for the proliferation of cytotoxic T cells.

The second and third amino acids of Pam2 lipopeptides are key for the proliferation of cytotoxic T cells.
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DOI:
10.1177/1753425918777598
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发表时间:
2018-07
期刊:
影响因子:
3.2
通讯作者:
Seya T
Seya T
中科院分区:
生物学4区
文献类型:
--
作者:
Takeda Y;Azuma M;Hatsugai R;Fujimoto Y;Hashimoto M;Fukase K;Matsumoto M;Seya T

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TLR 2激动剂,二棕榈酰脂肽(Pam 2LP),已被用作免疫佐剂,但没有太大的成功。Pam 2LP在人类和小鼠中被TLR 2/6受体识别。本研究使用小鼠Ag呈递树突状细胞(DC)和OT-I测定系统检测细胞毒性T淋巴细胞(CTL)的增殖活性,其中利用来自金黄色葡萄球菌数据库的合成Pam 2LP文库。Ag特异性CTL扩增和IFN-γ水平在很大程度上依赖于Pam 2LP肽序列。第一个Aa是半胱氨酸(Cys),其具有桥接脂肪酸的活性SH残基,并且第二个和第三个Aa是亲水性的或非极性的。该序列在结构上适应于所报道的TLR 2/6口袋的残余构成。无活性序列在第一个Cys后含有脯氨酸或亮氨酸/异亮氨酸。值得注意的是,在没有DC的情况下,通过用具有Cys-Ser序列的活性Pam 2LP刺激没有检测到OT-I细胞的直接活化。DC中的MyD 88而不是TICAM-1或IFN途径参与DC成熟,其特征在于上调CD 40、CD 80和CD 86。因此,活性Pam 2LP似乎适合于DC上的二聚体TLR 2/6,导致DC成熟的诱导。
The TLR2 agonist, dipalmitoyl lipopeptide (Pam2LP), has been used as an immune adjuvant without much success. Pam2LP is recognised by TLR2/6 receptors in humans and in mice. This study examined the proliferative activity of cytotoxic T lymphocytes (CTL) using mouse Ag-presenting dendritic cells (DCs) and OT-I assay system, where a library of synthetic Pam2LP was utilised from the Staphylococcus aureus database. Ag-specific CTL expansion and IFN-γ levels largely depended on the Pam2LP peptide sequence. The first Aa is cysteine (Cys), which has an active SH residue to bridge fatty acids, and the second and third Aa are hydrophilic or non-polar. The sequence structurally adapted to the residual constitution of the reported TLR2/6 pocket. The inactive sequence contained proline or leucine/isoleucine after the first Cys. Notably, no direct activation of OT-I cells was detected without DCs by stimulation with the active Pam2LP having the Cys-Ser sequence. MyD88, but not TICAM-1 or IFN pathways, in DCs participates in DC maturation characterised by upregulation of CD40, CD80 and CD86. Hence, the active Pam2LPs appear suitable for dimeric TLR2/6 on DCs, resulting in induction of DC maturation.
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