Tuberous sclerosis 1 promotes invariant NKT cell anergy and inhibits invariant NKT cell-mediated antitumor immunity.

Tuberous sclerosis 1 promotes invariant NKT cell anergy and inhibits invariant NKT cell-mediated antitumor immunity.
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结节性硬化症 1 促进恒定 NKT 细胞无反应性并抑制恒定 NKT 细胞介导的抗肿瘤免疫。

DOI:
10.4049/jimmunol.1302076
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发表时间:
2014-03-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Zhong XP
Zhong XP
中科院分区:
其他
文献类型:
--
作者:
Wu J;Shin J;Xie D;Wang H;Gao J;Zhong XP

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为癌症患者开发有效的免疫疗法需要更好地了解阻止产生有效的抗肿瘤免疫反应的障碍。动物体内给予α-半乳糖神经酰胺(α-GalCer)可通过激活不变的自然杀伤T细胞(INKT)来增强抗肿瘤免疫。然而,重复注射α-GalCer会导致iNKT细胞长期无反应或无能,严重限制了其根除肿瘤的效果。导致iNKT细胞无能的机制仍然知之甚少。我们在这里报道,结节性硬化症1(TSC1)是mTOR信号的负调控因子,在iNKT细胞无能中起着至关重要的作用。INKT细胞中Tsc1的缺失导致对α-GalCer诱导的无能的抵抗,表现为iNKT细胞对次级抗原刺激的反应增加和细胞因子的产生。它与PD-1、Egr2和Grail的表达受损有关。此外,在黑色素瘤肺转移模型中,缺乏TSC1的iNKT细胞显示出增强的抗肿瘤免疫能力。我们的数据建议将TSC1/2作为加强抗肿瘤免疫治疗的一种策略。
Development of effective immune therapies for cancer patients requires better understanding of hurdles that prevent the generation of effective anti-tumor immune responses. Administration of α-galactosylceramide (α-GalCer) in animals enhances anti-tumor immunity via activation of the invariant natural killer T (iNKT) cells. However, repeated injections of α-GalCer result in long-term unresponsiveness or anergy of iNKT cells, severely limiting its efficacy in tumor eradication. The mechanisms leading to iNKT cell anergy remain poorly understood. We report here that the tuberous sclerosis 1 (TSC1), a negative regulator of mTOR signaling, plays a crucial role in iNKT cell anergy. Deficiency of TSC1 in iNKT cells results in resistance to α-GalCer-induced anergy, manifested by increased expansion of and cytokine production by iNKT cells in response to secondary antigen stimulation. It is correlated with impaired upregulation of PD-1, Egr2, and Grail. Moreover, TSC1-deficient iNKT cells display enhanced anti-tumor immunity in a melanoma lung metastasis model. Our data suggest targeting TSC1/2 as a strategy for boosting anti-tumor immune therapy.
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