Ecto-5'-Nucleotidase (CD73) Regulates the Survival of CD8+ T Cells.

Ecto-5'-Nucleotidase (CD73) Regulates the Survival of CD8+ T Cells.
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DOI:
10.3389/fcell.2021.647058
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发表时间:
2021
影响因子:
5.5
通讯作者:
Sauma D
Sauma D
中科院分区:
生物学2区
文献类型:
--
作者:
Rosemblatt MV;Parra-Tello B;Briceño P;Rivas-Yáñez E;Tucer S;Saavedra-Almarza J;Hörmann P;Martínez BA;Lladser Á;Rosemblatt M;Cekic C;Bono MR;Sauma D

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外-5 ′-核苷酸酶(CD 73)是一种存在于肿瘤细胞表面的酶,其主要功能是产生细胞外腺苷。由于腺苷的免疫抑制特性,CD 73正被研究作为新的抗肿瘤疗法的靶点。我们和其他人已经描述了CD 73存在于不同CD 8 + T细胞亚群的表面。然而,关于CD 73是否影响CD 8 + T细胞增殖和存活的信息有限。在这项研究中,我们评估了CD 73缺陷对CD 8 + T细胞的影响,通过分析它们在抗原和稳态条件下的增殖和存活。从过继转移实验中获得的结果证明了CD 73的矛盾作用。一方面,它有利于CD 8 + T细胞上白细胞介素-7受体α链的表达及其稳态存活;另一方面,它降低了抗原刺激下活化的CD 8 + T细胞的存活。此外,在体外抗原刺激后,CD 73降低了白细胞介素-2受体α链和抗凋亡分子Bcl-2的表达,这一发现可能解释了在这种情况下观察到的CD 8 + T细胞存活率降低。这些结果表明,CD 73对CD 8 + T细胞具有双重作用,这取决于它们是否受到抗原或稳态刺激,因此,在设计新型抗肿瘤疗法时考虑CD 73阻断时,应特别注意这些方面。
Ecto-5′-nucleotidase (CD73) is an enzyme present on the surface of tumor cells whose primary described function is the production of extracellular adenosine. Due to the immunosuppressive properties of adenosine, CD73 is being investigated as a target for new antitumor therapies. We and others have described that CD73 is present at the surface of different CD8+ T cell subsets. Nonetheless, there is limited information as to whether CD73 affects CD8+ T cell proliferation and survival. In this study, we assessed the impact of CD73 deficiency on CD8+ T cells by analyzing their proliferation and survival in antigenic and homeostatic conditions. Results obtained from adoptive transfer experiments demonstrate a paradoxical role of CD73. On one side, it favors the expression of interleukin-7 receptor α chain on CD8+ T cells and their homeostatic survival; on the other side, it reduces the survival of activated CD8+ T cells under antigenic stimulation. Also, upon in vitro antigenic stimulation, CD73 decreases the expression of interleukin-2 receptor α chain and the anti-apoptotic molecule Bcl-2, findings that may explain the reduced CD8+ T cell survival observed in this condition. These results indicate that CD73 has a dual effect on CD8+ T cells depending on whether they are subject to an antigenic or homeostatic stimulus, and thus, special attention should be given to these aspects when considering CD73 blockade in the design of novel antitumor therapies.
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