E3 ligase FBXW7 restricts M2-like tumor-associated macrophage polarization by targeting c-Myc.

E3 ligase FBXW7 restricts M2-like tumor-associated macrophage polarization by targeting c-Myc.
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E3 连接酶 FBXW7 通过靶向 c-Myc 限制 M2 样肿瘤相关巨噬细胞极化

DOI:
10.18632/aging.202293
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发表时间:
2020-12-01
期刊:
Aging
影响因子:
--
通讯作者:
Chen Z
Chen Z
中科院分区:
其他
文献类型:
--
作者:
Zhong L;Zhang Y;Li M;Song Y;Liu D;Yang X;Yang D;Qu H;Lai L;Wang Q;Chen Z

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FBXW 7作为E3泛素连接酶,通过癌细胞中的泛素-蛋白酶体系统介导癌蛋白降解,有效抑制肿瘤细胞的生长和存活。然而,关于FBXW 7在巨噬细胞和肿瘤免疫微环境中的功能知之甚少。在这项研究中,我们发现FBXW 7抑制M2样肿瘤相关巨噬细胞(TAM)极化,以限制肿瘤进展。通过皮下接种刘易斯肺癌细胞(LLC),我们发现骨髓FBXW 7缺陷小鼠中M2样TAM的比例显著增加,肿瘤生长加剧。当在体外用LLC上清液刺激时,FBXW 7敲除的巨噬细胞显示增加的M2巨噬细胞极化和增强的支持癌细胞生长的能力。在机制上,我们证实FBXW 7通过介导c-Myc降解经由泛素-蛋白酶体系统抑制M2样TAM极化。这些发现突出了FBXW 7在M2样TAM极化中的作用,并为癌症免疫治疗的潜在靶点提供了新的见解。
FBXW7 functions as an E3 ubiquitin ligase to mediate oncoprotein degradation via the ubiquitin-proteasome system in cancer cells, effectively inhibiting the growth and survival of tumor cells. However, little is known about the functions of FBXW7 in macrophages and the tumor immune microenvironment. In this study, we find that FBXW7 suppresses M2-like tumor-associated macrophage (TAM) polarization to limit tumor progression. We identified a significant increase in the proportion of M2-like TAMs and aggravated tumor growth in mice with myeloid FBXW7 deficiency by subcutaneous inoculation with Lewis lung carcinoma cells (LLCs). When stimulated with LLCs supernatant in vitro, FBXW7-knockout macrophages displayed increased M2 macrophage polarization and enhanced ability of supporting cancer cells growth. In mechanism, we confirmed that FBXW7 inhibited M2-like TAM polarization by mediating c-Myc degradation via the ubiquitin-proteasome system. These findings highlight the role of FBXW7 in M2-like TAM polarization and provide new insights into the potential targets for cancer immunotherapies.
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