hTERT promotes tumor angiogenesis by activating VEGF via interactions with the Sp1 transcription factor.

hTERT promotes tumor angiogenesis by activating VEGF via interactions with the Sp1 transcription factor.
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hTERT 通过与 Sp1 转录因子相互作用激活 VEGF,从而促进肿瘤血管生成

DOI:
10.1093/nar/gkw549
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发表时间:
2016-10-14
影响因子:
14.9
通讯作者:
Cong YS
Cong YS
中科院分区:
生物学2区
文献类型:
--
作者:
Liu N;Ding D;Hao W;Yang F;Wu X;Wang M;Xu X;Ju Z;Liu JP;Song Z;Shay JW;Guo Y;Cong YS

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血管生成被认为是癌症的重要标志。虽然端粒酶被认为参与了肿瘤血管生成,但证据和潜在机制仍不清楚。在这里,我们证明,人端粒酶逆转录酶(hTERT)激活血管上皮生长因子(VEGF)基因的表达,通过与VEGF启动子和转录因子Sp1的相互作用。hTERT在体外和体内与Sp1结合,并以依赖于Sp1的方式刺激血管生成。在第一代Tert缺失小鼠中mTert基因的缺失损害了肿瘤生长,降低了VEGF表达。此外,我们发现hTERT表达水平与人胃肿瘤样本中VEGF的表达水平呈正相关。总之,我们的研究结果表明,hTERT促进肿瘤血管生成通过上调VEGF的表达,通过直接与VEGF基因和Sp1转录因子的相互作用。这些结果提供了新的见解hTERT在肿瘤进展中的功能,除了其在端粒维持的作用。
Angiogenesis is recognized as an important hallmark of cancer. Although telomerase is thought to be involved in tumor angiogenesis, the evidence and underlying mechanism remain elusive. Here, we demonstrate that human telomerase reverse transcriptase (hTERT) activates vascular epithelial growth factor (VEGF) gene expression through interactions with the VEGF promoter and the transcription factor Sp1. hTERT binds to Sp1 in vitro and in vivo and stimulates angiogenesis in a manner dependent on Sp1. Deletion of the mTert gene in the first generation of Tert null mice compromised tumor growth, with reduced VEGF expression. In addition, we show that hTERT expression levels are positively correlated with those of VEGF in human gastric tumor samples. Together, our results demonstrate that hTERT facilitates tumor angiogenesis by up-regulating VEGF expression through direct interactions with the VEGF gene and the Sp1 transcription factor. These results provide novel insights into hTERT function in tumor progression in addition to its role in telomere maintenance.
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