T cell circuits that sense antigen density with an ultrasensitive threshold.

T cell circuits that sense antigen density with an ultrasensitive threshold.
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DOI:
10.1126/science.abc1855
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发表时间:
2021-03-12
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Lim WA
Lim WA
中科院分区:
其他
文献类型:
--
作者:
Hernandez-Lopez RA;Yu W;Cabral KA;Creasey OA;Lopez Pazmino MDP;Tonai Y;De Guzman A;Mäkelä A;Saksela K;Gartner ZJ;Lim WA

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过表达的肿瘤相关抗原[例如,表皮生长因子受体(EGFR)和人表皮生长因子受体2(HER 2)]是治疗性T细胞的有吸引力的靶点,但是与表达低水平靶抗原的正常组织的毒性“肿瘤外”交叉反应可以与嵌合抗原受体(CAR)-T细胞一起发生。受自然超灵敏反应电路的启发,我们设计了一个两步正反馈电路,允许人类细胞毒性T细胞根据S形抗原密度阈值来区分目标。在该回路中,针对HER 2的低亲和力合成Notch受体控制针对HER 2的高亲和力CAR的表达。因此,增加HER 2密度对T细胞具有协同作用-它增加CAR表达和激活-导致S形反应。具有这种电路的T细胞在体外和体内都显示出表达正常量的HER 2的靶细胞和表达100倍HER 2的癌细胞之间的明显区分。
Overexpressed tumor-associated antigens [for example, epidermal growth factor receptor (EGFR) and human epidermal growth factor receptor 2 (HER2)] are attractive targets for therapeutic T cells, but toxic “off-tumor” cross-reaction with normal tissues that express low levels of target antigen can occur with chimeric antigen receptor (CAR)-T cells. Inspired by natural ultrasensitive response circuits, we engineered a two-step positive-feedback circuit that allows human cytotoxic T cells to discriminate targets on the basis of a sigmoidal antigen-density threshold. In this circuit, a low-affinity synthetic Notch receptor for HER2 controls the expression of a high-affinity CAR for HER2. Increasing HER2 density thus has cooperative effects on T cells–it increases both CAR expression and activation–leading to a sigmoidal response. T cells with this circuit show sharp discrimination between target cells expressing normal amounts of HER2 and cancer cells expressing 100 times as much HER2, both in vitro and in vivo.
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