Tumor-derived extracellular vesicles regulate tumor-infiltrating regulatory T cells via the inhibitory immunoreceptor CD300a

被引:0
作者
Nakazawa, Yuta [1 ,2 ]
Nishiyama, Nanako [1 ,2 ]
Koizumi, Hitoshi [1 ,2 ]
Kanemaru, Kazumasa [1 ,3 ]
Nakahashi-Oda, Chigusa [1 ,3 ]
Shibuya, Akira [1 ,3 ,4 ]
机构
[1] Univ Tsukuba, Fac Med, Dept Immunol, Tsukuba, Ibaraki, Japan
[2] Univ Tsukuba, Grad Sch Comprehens Human Sci, Doctoral Program Biomed Sci, Tsukuba, Ibaraki, Japan
[3] Univ Tsukuba, R&D Ctr Innovat Drug Discovery, Tsukuba, Ibaraki, Japan
[4] Univ Tsukuba, Life Sci Ctr Survival Dynam, Tsukuba Adv Res Alliance TARA, Tsukuba, Ibaraki, Japan
来源
ELIFE | 2021年 / 10卷
基金
日本学术振兴会;
关键词
tumor-infiltrating regulatory T cells; tumor-derived extracellular vesicles; immunoreceptor; dendritic cells; IFN-b; CD300a; Mouse; I INTERFERONS; MAST-CELL; CANCER; RESPONSES; PHOSPHATIDYLSERINE; MICRORNAS; APOPTOSIS; EXOSOMES; GROWTH; TLR3;
D O I
10.7554/eLife.61999; 10.7554/eLife.61999.sa0; 10.7554/eLife.61999.sa1; 10.7554/eLife.61999.sa2
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Although tumor-infiltrating regulatory T (Treg) cells play a pivotal role in tumor immunity, how Treg cell activation are regulated in tumor microenvironments remains unclear. Here, we found that mice deficient in the inhibitory immunoreceptor CD300a on their dendritic cells (DCs) have increased numbers of Treg cells in tumors and greater tumor growth compared with wild-type mice after transplantation of B16 melanoma. Pharmacological impairment of extracellular vesicle (EV) release decreased Treg cell numbers in CD300a-deficient mice. Coculture of DCs with tumor-derived EV (TEV) induced the internalization of CD300a and the incorporation of EVs into endosomes, in which CD300a inhibited TEV-mediated TLR3-TRIF signaling for activation of the IFN-beta-Treg cells axis. We also show that higher expression of CD300A was associated with decreased tumor-infiltrating Treg cells and longer survival time in patients with melanoma. Our findings reveal the role of TEV and CD300a on DCs in Treg cell activation in the tumor microenvironment.
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页数:23
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