A role for lipid bodies in the cross-presentation of phagocytosed antigens by MHC class I in dendritic cells.

A role for lipid bodies in the cross-presentation of phagocytosed antigens by MHC class I in dendritic cells.
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DOI:
10.1016/j.immuni.2009.06.022
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发表时间:
2009-08-21
期刊:
影响因子:
32.4
通讯作者:
Guermonprez, Pierre
Guermonprez, Pierre
中科院分区:
医学1区
文献类型:
--
作者:
Bougneres, Laurence;Helft, Julie;Tiwari, Sangeeta;Vargas, Pablo;Chang, Benny Hung-Junn;Chan, Lawrence;Campisi, Laura;Lauvau, Gregoire;Hugues, Stephanie;Kumar, Pradeep;Kamphorst, Alice O.;Dumenil, Ana-Maria Lennon;Nussenzweig, Michel;MacMicking, John D.;Amigorena, Sebastian;Guermonprez, Pierre

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树突状细胞(DC)具有与MHC I类T细胞和CD8+T细胞交叉递呈外源性抗原的显著能力。然而,交叉呈现背后的细胞内通路仍然不清楚。目前的模型包括蛋白酶体对抗原的胞浆蛋白分解和TAP依赖的内质网(ER)或吞噬体腔的输入。在这里,我们发现DC表达内质网驻留的47 kDa免疫相关GTP酶IrgM3。IrgM3位于内质网和脂体(Lb)膜上,在那里它与LB膜成分adrp结合。IrgM3或adrp的基因去除会导致DC的LB形成缺陷,并严重损害吞噬的抗原向CD8+细胞的交叉提呈,而不是向CD4+T细胞的抗原提呈。因此,我们定义了一个新的作用,即在调节DC中外源性抗原与CD8+T淋巴细胞的交叉递呈中,LB细胞器扮演了一个新的角色。
Dendritic cells (DCs) have the striking ability to cross-present exogenous antigens in association with MHC class I to CD8+ T cells. However, the intracellular pathways underlying cross-presentation remain ill-defined. Current models involve cytosolic proteolysis of antigens by the proteasome and TAP-dependent import into Endoplasmic Reticulum (ER) or phagosomal lumen. Here, we show that DCs express an ER-resident 47kDa immune-related GTPase, Irgm3. Irgm3 resides on ER and lipid body (LB) membranes where it binds the LB coat component ADRP. Genetic removal of either Irgm3 or ADRP leads to defects in LB formation in DCs and severely impairs cross-presentation of phagocytozed antigens to CD8+ but not antigen presentation to CD4+ T cells. We thus define a new role for LB organelles in regulating cross-presentation of exogenous antigens to CD8+ T lymphocytes in DCs.
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