SUMOylation is essential for Sirt2 tumor-suppressor function in neuroblastoma.

SUMOylation is essential for Sirt2 tumor-suppressor function in neuroblastoma.
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SUMO化对于神经母细胞瘤中 Sirt2 肿瘤抑制功能至关重要

DOI:
10.1016/j.neo.2020.11.013
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发表时间:
2021-01
期刊:
Neoplasia (New York, N.Y.)
影响因子:
--
通讯作者:
Xu M
Xu M
中科院分区:
其他
文献类型:
--
作者:
Lu W;Wang Q;Xu C;Yuan H;Fan Q;Chen B;Cai R;Wu D;Xu M

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苏莫化是真核细胞中一种重要的翻译后修饰,参与了多种细胞的生理和病理过程。SIRT2是一种依赖NAD+的脱乙酰酶,通常发挥肿瘤抑制功能。然而,SUMO化在癌细胞中的作用还不完全清楚。在这项研究中,我们发现SIRT2蛋白在赖氨酸183和赖氨酸340位都可以发生SUMO化。苏莫化不影响SIRT2的定位或稳定性,但通过在新的底物MAPK/P38上直接去乙酰化参与P38-mTORC2-AKT细胞信号转导。在神经母细胞瘤细胞中,苏莫化缺陷的SIRT2失去了抑制肿瘤进程的能力,并对SIRT2特异性抑制剂AK-7表现出耐药性。在这里,我们揭示了SIRT2-SUMO化的重要功能,它与细胞信号转导密切相关,对于抑制神经母细胞瘤的肿瘤发生至关重要。
SUMOylation is an important post-translational modification that participates in a variety of cellular physiological and pathological processes in eukaryotic cells. Sirt2, a NAD+-dependent deacetylase, usually exerts a tumor-suppressor function. However, the role of SUMOylation in cancer cells is not fully known. In this study, we found that SUMOylation can occur in the Sirt2 protein at both lysine 183 and lysine 340 sites. SUMOylation did not affect Sirt2 localization or stability but was involved in P38-mTORC2-AKT cellular signal transduction via direct deacetylation on a new substrate MAPK/P38. SUMOylation-deficient Sirt2 lost the capability of suppressing tumor processes and showed resistance to the Sirt2-specific inhibitor AK-7 in neuroblastoma cells. Here, we revealed the important function of Sirt2-SUMOylation, which is closely associated with cellular signal transduction and is essential for suppressing tumorigenesis in neuroblastoma.
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