Tumor masses support naive T cell infiltration, activation, and differentiation into effectors.

Tumor masses support naive T cell infiltration, activation, and differentiation into effectors.
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DOI:
10.1084/jem.20092454
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发表时间:
2010-08-02
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Engelhard VH
Engelhard VH
中科院分区:
其他
文献类型:
--
作者:
Thompson ED;Enriquez HL;Fu YX;Engelhard VH

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T 细胞对肿瘤反应的研究主要集中在引流淋巴结 (LN) 作为激活部位。我们检查了肿瘤块作为幼稚肿瘤特异性 CD8 T 细胞过继转移后的潜在激活位点。过继转移后 24 小时内,激活的 CD8 T 细胞出现在肿瘤中,并且在用 FTY720 治疗以防止 LN 中激活的细胞浸润的小鼠中,4-5 天后这些细胞的增殖也很明显。为了确认这些 T 细胞的激活发生在肿瘤中,而不是肿瘤引流的淋巴结中,我们使用了缺乏淋巴结的小鼠。在初始细胞移植后 24 小时和 4 天,这些小鼠中明显出现激活和增殖的肿瘤浸润淋巴细胞。肿瘤内激活的 T 细胞获得了离体和体内均明显的效应功能。肿瘤内交叉呈递抗原的呈递细胞和直接呈递抗原的肿瘤细胞都激活这些功能性CD8效应子。我们得出的结论是,尽管存在免疫抑制机制,肿瘤仍支持初始 CD8 T 细胞的浸润、激活和效应分化。因此,T细胞活化靶向肿瘤可能为癌症免疫疗法的发展提供一种工具。
Studies of T cell responses to tumors have focused on the draining lymph node (LN) as the site of activation. We examined the tumor mass as a potential site of activation after adoptive transfer of naive tumor-specific CD8 T cells. Activated CD8 T cells were present in tumors within 24 h of adoptive transfer and proliferation of these cells was also evident 4–5 d later in mice treated with FTY720 to prevent infiltration of cells activated in LNs. To confirm that activation of these T cells occurred in the tumor and not the tumor-draining LNs, we used mice lacking LNs. Activated and proliferating tumor-infiltrating lymphocytes were evident in these mice 24 h and 4 d after naive cell transfer. T cells activated within tumors acquired effector function that was evident both ex vivo and in vivo. Both cross-presenting antigen presenting cells within the tumor and tumor cells directly presenting antigen activated these functional CD8 effectors. We conclude that tumors support the infiltration, activation, and effector differentiation of naive CD8 T cells, despite the presence of immunosuppressive mechanisms. Thus, targeting of T cell activation to tumors may present a tool in the development of cancer immunotherapy.
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