Impaired selection of invariant natural killer T cells in diverse mouse models of glycosphingolipid lysosomal storage diseases.

Impaired selection of invariant natural killer T cells in diverse mouse models of glycosphingolipid lysosomal storage diseases.
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DOI:
10.1084/jem.20060921
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发表时间:
2006-10-02
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Cerundolo V
Cerundolo V
中科院分区:
其他
文献类型:
--
作者:
Gadola SD;Silk JD;Jeans A;Illarionov PA;Salio M;Besra GS;Dwek R;Butters TD;Platt FM;Cerundolo V

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不变自然杀伤T细胞(iNKT细胞)的糖脂配体被加载到晚期内体/溶酶体中的CD1d分子上。溶酶体贮积症中鞘糖脂(GSLs)的积聚可能潜在地影响内源性和外源性脂质的加载和/或呈递,从而影响iNKT细胞的选择或功能。在多种溶酶体GSL贮积症小鼠模型中,iNKT细胞的百分比和频率均降低,与特定的遗传缺陷或所贮积的脂质种类无关。iNKT细胞数量的减少导致在α -半乳糖神经酰胺(α -GalCer)刺激下细胞因子产生缺失,以及iNKT细胞介导的负载α -GalCer的野生型靶细胞裂解减少。iNKT细胞的减少并非由CD1d表达缺陷或抗原呈递细胞缺乏所致。尽管H - 2限制性CD4 + T细胞反应通常未受影响,但在所有受试小鼠品系中,一种依赖溶酶体的α -GalCer类似物的加工均受损。这些数据表明,GSL贮积可能导致因选择配体呈递受损而引起的iNKT细胞胸腺选择改变。
Glycolipid ligands for invariant natural killer T cells (iNKT cells) are loaded onto CD1d molecules in the late endosome/lysosome. Accumulation of glycosphingolipids (GSLs) in lysosomal storage diseases could potentially influence endogenous and exogenous lipid loading and/or presentation and, thus, affect iNKT cell selection or function. The percentages and frequency of iNKT cells were reduced in multiple mouse models of lysosomal GSL storage disease, irrespective of the specific genetic defect or lipid species stored. Reduced numbers of iNKT cells resulted in the absence of cytokine production in response to α-galactosylceramide (α-GalCer) and reduced iNKT cell–mediated lysis of wild-type targets loaded with α-GalCer. The reduction in iNKT cells did not result from defective expression of CD1d or a lack of antigen-presenting cells. Although H-2 restricted CD4+ T cell responses were generally unaffected, processing of a lysosome-dependent analogue of α-GalCer was impaired in all the strains of mice tested. These data suggest that GSL storage may result in alterations in thymic selection of iNKT cells caused by impaired presentation of selecting ligands.
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