Intratumoral IL-12 combined with CTLA-4 blockade elicits T cell-mediated glioma rejection.

Intratumoral IL-12 combined with CTLA-4 blockade elicits T cell-mediated glioma rejection.
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DOI:
10.1084/jem.20130678
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发表时间:
2013-12-16
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Becher B
Becher B
中科院分区:
其他
文献类型:
--
作者:
Vom Berg J;Vrohlings M;Haller S;Haimovici A;Kulig P;Sledzinska A;Weller M;Becher B

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T细胞是局部应用IL-12和阻断CTLA-4诱导的胶质瘤排斥反应的重要效应细胞。胶质母细胞瘤(GBs)是最具侵袭性的原发脑癌,几乎无法治愈。调节性T(T Reg)细胞在GBs中的聚集被认为是导致抗肿瘤免疫受抑的原因之一。使用GB的同基因小鼠模型,我们测试了细胞因子的局部传递是否可以使免疫抑制的GB微环境有利于抗肿瘤免疫反应。IL-12而不是IL-23逆转了GB诱导的免疫抑制并导致肿瘤清除。与皮肤癌或肺癌模型相比,IL-12介导的胶质瘤排斥反应是T细胞依赖性的,并引发了强大的免疫记忆。为了将这些发现转化为与临床相关的环境,我们在开始治疗之前考虑了GB进展。结合瘤内应用IL-12和全身阻断T细胞上的共抑制受体CTLA-4,即使在疾病晚期,用IL-12或CTLA-4阻断单一疗法失败时,肿瘤也能被根除。IL-12和CTLA-4联合阻断主要作用于CD4+细胞,导致FoxP3+T细胞急剧减少,效应性T细胞增加。我们的数据提供了令人信服的临床前发现,保证了快速转化为GB的临床试验,并代表了一种有希望的方法,以提高CTLA-4阻断在实体瘤中的应答率。
T cells are crucial effectors of glioma rejection induced by local IL-12 application and CTLA-4 blockade. Glioblastomas (GBs) are the most aggressive form of primary brain cancer and virtually incurable. Accumulation of regulatory T (T reg) cells in GBs is thought to contribute to the dampening of antitumor immunity. Using a syngeneic mouse model for GB, we tested whether local delivery of cytokines could render the immunosuppressive GB microenvironment conducive to an antitumor immune response. IL-12 but not IL-23 reversed GB-induced immunosuppression and led to tumor clearance. In contrast to models of skin or lung cancer, IL-12–mediated glioma rejection was T cell dependent and elicited potent immunological memory. To translate these findings into a clinically relevant setting, we allowed for GB progression before initiating therapy. Combined intratumoral IL-12 application with systemic blockade of the co-inhibitory receptor CTLA-4 on T cells led to tumor eradication even at advanced disease stages where monotherapy with either IL-12 or CTLA-4 blockade failed. The combination of IL-12 and CTLA-4 blockade acts predominantly on CD4+ cells, causing a drastic decrease in FoxP3+ T reg cells and an increase in effector T (T eff) cells. Our data provide compelling preclinical findings warranting swift translation into clinical trials in GB and represent a promising approach to increase response rates of CTLA-4 blockade in solid tumors.
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