The role of toll-like receptor 4 in tumor microenvironment.

The role of toll-like receptor 4 in tumor microenvironment.
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Toll样受体4在肿瘤微环境中的作用

DOI:
10.18632/oncotarget.19105
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发表时间:
2017-09-12
期刊:
影响因子:
--
通讯作者:
Ren X
Ren X
中科院分区:
其他
文献类型:
--
作者:
Li J;Yang F;Wei F;Ren X

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肿瘤与慢性炎症密切相关,在慢性炎症过程中,炎症部位会发生各种变化,如免疫细胞浸润、促炎细胞因子产生、免疫细胞与组织细胞相互作用等。此外,外源性病因攻击的两种组织细胞释放的物质也作用于局部细胞。这些变化诱导有利于肿瘤生长、侵袭和转移的动态和复杂的微环境。Toll样受体4(TLR4)是Toll样受体家族中第一个识别病原体相关分子模式(PAMPs)和损伤相关分子模式(DAMPs)的成员。TLR4不仅在免疫细胞上表达,而且在肿瘤细胞上也有表达。越来越多的证据表明,肿瘤微环境中TLR4的激活不仅可以增强机体的抗肿瘤免疫,而且可以引起机体的免疫监视和肿瘤的进展。本文就肿瘤微环境中TLR 4在树突状细胞(DCs)、肿瘤相关巨噬细胞(TAMs)、T细胞、髓源性抑制细胞(MDSCs)、肿瘤细胞以及基质细胞上的表达和功能进行综述。TLR4在肿瘤中的多重作用的验证可以为抗肿瘤免疫治疗的发展铺平道路。
Tumors are closely related to chronic inflammation, during which there are various changes in inflammatory sites, such as immune cells infiltration, pro-inflammation cytokines production, and interaction between immune cells and tissue cells. Besides, substances, released from both tissue cells attacked by exogenous etiologies, also act on local cells. These changes induce a dynamic and complex microenvironment favorable for tumor growth, invasion, and metastasis. The toll-like receptor 4 (TLR4) is the first identified member of the toll-like receptor family that can recognize pathogen-associated molecular patterns (PAMPs) and damage-associated molecular pattern (DAMPs). TLR4 expresses not only on immune cells but also on tumor cells. Accumulating evidences demonstrated that the activation of TLR4 in tumor microenvironment can not only boost the anti-tumor immunity but also give rise to immune surveillance and tumor progression. This review will summarize the expression and function of TLR4 on dendritic cells (DCs), tumor-associated macrophages (TAMs), T cells, myeloid-derived suppressor cells (MDSCs), tumor cells as well as stromal cells in tumor microenvironment. Validation of the multiple role of TLR4 in tumors could primarily pave the road for the development of anti-tumor immunotherapy.
吸收到细胞载体的TLR4激动剂的肿瘤内给药可改善抗肿瘤反应。
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