Manganese superoxide dismutase mediates anoikis resistance and tumor metastasis in nasopharyngeal carcinoma.

Manganese superoxide dismutase mediates anoikis resistance and tumor metastasis in nasopharyngeal carcinoma.
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锰超氧化物歧化酶介导鼻咽癌失巢凋亡抵抗和肿瘤转移。

DOI:
10.18632/oncotarget.8717
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发表时间:
2016-05-31
期刊:
影响因子:
--
通讯作者:
Yang X
Yang X
中科院分区:
其他
文献类型:
--
作者:
Li S;Mao Y;Zhou T;Luo C;Xie J;Qi W;Yang Z;Ma J;Gao G;Yang X

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转移性癌细胞能够通过对失巢凋亡(一种特殊形式的细胞凋亡)产生抵抗力,在失去与细胞外基质 (ECM) 的附着后存活下来。在这里,我们研究了鼻咽癌细胞(NPC)对失巢凋亡的抵抗力。当在培养物中分离时,与低转移性的S26 NPC细胞系相比,高转移性的S18 NPC细胞系表现出对失巢凋亡的强抵抗性。随着附着的丧失,S18 细胞的活性氧 (ROS) 水平较低,而锰超氧化物歧化酶 (MnSOD)(一种重要的线粒体抗氧化酶)水平较高。 MnSOD 敲除增加了 S18 细胞中 ROS 的水平并降低了对失巢凋亡的抵抗力。相反,使用 NAC 去除活性氧 (ROS) 或在 S26 细胞中过度表达 MnSOD 会诱导对失巢凋亡的抵抗。通过RNA干扰阻断β-连环蛋白可下调S18细胞中的MnSOD表达并增强失巢凋亡,而β-连环蛋白过表达可增强S26细胞中的MnSOD表达并抑制失巢凋亡。此外,敲除S18细胞中的MnSOD可减少体外集落形成并改善体内肺转移。在鼻咽癌患者中,MnSOD 表达与肿瘤病理分期呈正相关,与总生存期呈负相关。这些结果表明 MnSOD 是失巢凋亡抵抗和肿瘤转移的关键介质,并表明 β-catenin/MnSOD 可能成为 NPC 的治疗靶点。
Metastatic cancer cells are able to survive the loss of attachment to the extracellular matrix (ECM) by developing resistance to anoikis, a specialized form of apoptosis. Here we investigated resistance to anoikis in nasopharyngeal carcinoma cells (NPC). When detached in culture, the highly metastatic S18 NPC cell line exhibited strong resistance to anoikis, as compared to the poorly metastatic S26 NPC cell line. With loss of attachment, S18 cells had lower levels of reactive oxygen species (ROS) and higher levels of manganese superoxide dismutase (MnSOD), an essential mitochondrial antioxidant enzyme. MnSOD knockdown increased the levels of ROS and diminished resistance to anoikis in S18 cells. Conversely, removal of reactive oxygen species (ROS) using NAC or overexpression of MnSOD in S26 cells induced resistance to anoikis. Blocking β-catenin through RNA interference down-regulated MnSOD expression and enhanced anoikis in S18 cells, while β-catenin overexpression enhanced MnSOD expression and suppressed anoikis in S26 cells. In addition, knockdown of MnSOD in S18 cells reduced colony formation in vitro and ameliorated lung metastasis in vivo. In patients with NPC, MnSOD expression was positively correlated with pathologic tumor stages and negatively correlated with overall survival. These results establish MnSOD as a key mediator of anoikis resistance and tumor metastasis and suggest that β-catenin/MnSOD could be a therapeutic target in NPC.
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