Enhanced T cell effector activity by targeting the Mediator kinase module.

Enhanced T cell effector activity by targeting the Mediator kinase module.
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通过靶向介体激酶模块来增强T细胞效应子活性。

DOI:
10.1126/science.abn5647
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发表时间:
2022-11-11
期刊:
Science (New York, N.Y.)
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其他
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T细胞是免疫系统的主要分支,负责控制和消退癌症。为了鉴定限制T细胞功能的基因,我们在人类CAR-T细胞中进行了全基因组CRISPR敲除筛选。最高命中是MED 12和CCNC,介体细胞周期蛋白依赖性激酶(CDK)模块的组分。靶向MED 12缺失增强了抗肿瘤活性并维持了CAR和TCR工程化T细胞中的效应子表型,并且抑制CDK 8/19激酶活性增加了非工程化T细胞的扩增。MED 12缺陷型T细胞在转录活性增强子处表现出核心Meditator染色质占据率增加,对于STAT和AP 1转录因子最明显,并且IL 2 RA表达和IL-2敏感性增加。这些结果暗示了T细胞效应物编程中的介体,并鉴定了CDK模块作为增强抗肿瘤T细胞应答效力的靶标。介体激酶模块是T细胞效应子功能的主要调节物,并且该模块的遗传或化学抑制增强T细胞效力。
T cells are the major arm of the immune system responsible for controlling and regressing cancers. To identify genes limiting T cell function, we conducted genome-wide CRISPR knock-out screens in human CAR-T cells. Top hits were MED12 and CCNC, components of the Mediator cyclin-dependent kinase (CDK) module. Targeted MED12 deletion enhanced anti-tumor activity and sustained the effector phenotype in CAR- and TCR-engineered T cells, and inhibition of CDK8/19 kinase activity increased expansion of non-engineered T cells. MED12 deficient T cells manifested increased core Meditator chromatin occupancy at transcriptionally active enhancers, most pronounced for STAT and AP1 transcription factors, and increased IL2RA expression and IL-2 sensitivity. These results implicate Mediator in T cell effector programming and identify the CDK module as a target for enhancing potency of anti-tumor T cell responses. The Mediator kinase module is a primary regulator of T cell effector function, and genetic or chemical inhibition of this module enhances T cell potency.
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