N-Glycosylation at Asn291 Stabilizes TIM-4 and Promotes the Metastasis of NSCLC.

N-Glycosylation at Asn291 Stabilizes TIM-4 and Promotes the Metastasis of NSCLC.
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DOI:
10.3389/fonc.2022.730530
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发表时间:
2022
影响因子:
4.7
通讯作者:
--
中科院分区:
医学3区
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T细胞免疫球蛋白结构域和粘蛋白结构域4(TIM-4)是促进上皮-间质转化(EMT)、非小细胞肺癌(NSCLC)细胞的迁移和侵袭的跨膜蛋白。大多数跨膜蛋白都是通过N-糖基化修饰的,并且蛋白质N-糖基化在癌细胞转移中的重要性已经被充分认识。然而,TIM-4是否被N-糖基化修饰以及TIM-4 N-糖基化在NSCLC中的作用在很大程度上仍然未知。在目前的研究中,我们报道了TIM-4在Asn 291处被广泛的N-糖基化。在去除N-糖基化后,TIM-4蛋白的稳定性降低,并且TIM-4更容易被ER定位的泛素连接酶介导的ERAD降解。因此,TIM-4在细胞表面上的表达降低,这抑制了TIM-4介导的NSCLC转移。总之,本研究鉴定了TIM-4 N-糖基化及其在NSCLS迁移中的作用,这将为开发靶向TIM-4上Asn 291处N-糖基化的药物提供有价值的生物标志物。
T-cell immunoglobulin domain and mucin domain 4 (TIM-4) is a transmembrane protein that promotes epithelial-mesenchymal transition (EMT), migration and invasion of non-small cell lung cancer (NSCLC) cells. Most transmembrane proteins are modified by N-glycosylation and the importance of protein N-glycosylation in cancer cell metastasis has been well appreciated. However, whether TIM-4 is modified by N-glycosylation and the role of TIM-4 N-glycosylation in NSCLC remains largely unknown. In the current study, we reported that TIM-4 was extensively N-glycosylated at Asn291. After the removal of N-glycosylation, the stability of TIM-4 protein was decreased and TIM-4 was more susceptible to degradation by ER-localized ubiquitin ligase-mediated ERAD. Thus, the expression of TIM-4 on the cell surface was decreased, which suppressed TIM-4-mediated metastasis in NSCLC. In summary, the present study identifies TIM-4 N-glycosylation and its role in NSCLS migration, which would provide a valuable biomarker for developing drugs targeting N-glycosylation at Asn291 on TIM-4.
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