Mrp1 is involved in lipid presentation and iNKT cell activation by Streptococcus pneumoniae.

Mrp1 is involved in lipid presentation and iNKT cell activation by Streptococcus pneumoniae.
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DOI:
10.1038/s41467-018-06646-8
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发表时间:
2018-10-15
影响因子:
16.6
通讯作者:
Kronenberg M
Kronenberg M
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Chandra S;Gray J;Kiosses WB;Khurana A;Hitomi K;Crosby CM;Chawla A;Fu Z;Zhao M;Veerapen N;Richardson SK;Porcelli SA;Besra G;Howell AR;Sharma S;Peters B;Kronenberg M

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不变的自然杀伤 T 细胞 (iNKT 细胞) 被 CD1d 呈递的脂质抗原激活,但导致脂质抗原呈递的途径仍未完全表征。在这里,我们展示了全基因组 siRNA 筛选,以阐明 CD1d 呈递途径。大多数减少抗原呈递的基因敲低会减少细胞表面糖脂-CD1d 复合物的形成,包括 HOPS 和 ESCRT 复合物的成员、影响细胞骨架重排的基因和 ABC 家族转运蛋白。我们验证了多药耐药蛋白 1 (Mrp1) 在 CD1d 抗原呈递中的体内作用。 Mrp1 缺陷会减少 CD1d 的表面聚集,从而减少 iNKT 细胞的激活。受感染的 Mrp1 敲除小鼠表现出 iNKT 细胞对肺炎链球菌抗原的反应降低,并与死亡率增加相关。我们的结果强调了脂质抗原呈递所涉及的独特细胞事件,并显示了对该途径的修改如何导致致命感染。 CD1d 途径呈递脂质抗原,导致 iNKT 细胞激活,但完整的途径仍有待完全阐明。在这里,钱德拉等人。使用 siRNA 筛选并确定 Mrp1 在肺炎链球菌感染的情况下对于 CD1d 脂质呈递和 iNKT 激活至关重要。
Invariant natural killer T cells (iNKT cells) are activated by lipid antigens presented by CD1d, but the pathway leading to lipid antigen presentation remains incompletely characterized. Here we show a whole-genome siRNA screen to elucidate the CD1d presentation pathway. A majority of gene knockdowns that diminish antigen presentation reduced formation of glycolipid-CD1d complexes on the cell surface, including members of the HOPS and ESCRT complexes, genes affecting cytoskeletal rearrangement, and ABC family transporters. We validated the role in vivo for the multidrug resistance protein 1 (Mrp1) in CD1d antigen presentation. Mrp1 deficiency reduces surface clustering of CD1d, which decreased iNKT cell activation. Infected Mrp1 knockout mice show decreased iNKT cell responses to antigens from Streptococcus pneumoniae and were associated with increased mortality. Our results highlight the unique cellular events involved in lipid antigen presentation and show how modification of this pathway can lead to lethal infection. The CD1d pathway present lipid antigens resulting in the activation of iNKT cells but the complete pathway remains to be fully elucidated. Here, Chandra et al. use an siRNA screen and identify Mrp1 as crucial for CD1d lipid presentation and activation of iNKT in the context of Streptococcus pneumoniae infection.
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