Mechanisms for glycolipid antigen-driven cytokine polarization by Valpha14i NKT cells.

Mechanisms for glycolipid antigen-driven cytokine polarization by Valpha14i NKT cells.
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DOI:
10.4049/jimmunol.0902880
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发表时间:
2010-01-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Kronenberg M
Kronenberg M
中科院分区:
其他
文献类型:
--
作者:
Sullivan BA;Nagarajan NA;Wingender G;Wang J;Scott I;Tsuji M;Franck RW;Porcelli SA;Zajonc DM;Kronenberg M

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Vα14i NKT细胞的某些糖脂抗原可以指导免疫应答的整体细胞因子平衡。与已知的最有效的激动剂αGalCer相比,Th2偏置的Och具有较低的TCR亲和力。尽管Och和αGalCer的CD1d暴露部分是相同的,但结构分析表明,由于这两个AGs埋藏的脂类部分的不同,CD1d构象存在细微的差异,这可能是抗原效力不同的原因。Th1偏置C-糖苷/CD1d比Och/CD1d具有更弱的TCR相互作用。尽管如此,C-糖苷引起了NK细胞更大的下游激活以产生干扰素γ,这是其促进Th1应答的原因。我们发现,这种差异与C-糖苷/CD1d复合体在体内存活时间更长的发现有关。因此,我们认为糖脂的药代动力学特性是细胞因子偏斜的主要决定因素,这为设计用于调节iNKT细胞反应的治疗性糖脂提供了一条途径。
Certain glycolipid antigens (Ags) for Vα14i NKT cells can direct the overall cytokine balance of the immune response. TH2-biasing OCH has a lower TCR avidity than the most potent agonist known, αGalCer. Although the CD1d-exposed portions of OCH and αGalCer are identical, structural analysis indicates that there are subtle CD1d conformational differences due to differences in the buried lipid portion of these two Ags, likely accounting for the difference in antigenic potency. TH1 biasing C-glycoside/CD1d has even weaker TCR interactions than OCH/CD1d. Despite this, C-glycoside caused a greater downstream activation of NK cells to produce IFNγ, accounting for its promotion of TH1 responses. We found that this difference correlated with the finding that C-glycoside/CD1d complexes survive much longer in vivo. Therefore, we suggest that the pharmacokinetic properties of glycolipids are a major determinant of cytokine skewing, suggesting a pathway for designing therapeutic glycolipids for modulating iNKT cell responses.
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