Survivin enhances telomerase activity via up-regulation of specificity protein 1-and c-Myc-mediated human telomerase reverse transcriptase gene transcription

被引:115
作者
Endoh, T [1 ]
Tsuji, N [1 ]
Asanuma, K [1 ]
Yagihashi, A [1 ]
Watanabe, N [1 ]
机构
[1] Sapporo Med Univ, Dept Clin Lab Med, Sch Med, Chuo Ku, Sapporo, Hokkaido 0608543, Japan
关键词
survivin; colon cancer cells; telomerase; human telomerase reverse transcriptase (hTERT); specificity protein 1 (Sp1); c-Myc; phosphatidylinositol 3 kinase (PI3 kinase);
D O I
10.1016/j.yexcr.2004.12.014
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Suppression of apoptosis is thought to contribute to carcinogenesis. Survivin, a member of the inhibitor-of-apoptosis family, blocks apoptotic signaling activated by various cellular stresses. Since elevated expression of survivin observed in human cancers of varied origin was associated with poor patient survival, survivin has attracted growing attention as a potential target for cancer treatment. Immortalization of cells also is required for carcinogenesis; telomere length maintenance by telomerase is required for cancer cells to proliferate indefinitely. Yet how cancer cells activate telomerase remains unclear. We therefore examined possible interrelationships between survivin expression and telomerase activity. Correlation between survivin and human telomerase reverse transcriptase (hTERT) expression was observed in colon cancer tissues, and overexpression of survivin enhanced telomerase activity by up-regulation of hTERT expression in LS 180 human colon cancer cells. DNA-binding activities of specificity protein 1 (Sp1) and c-Myc to the hTERT core promoter were increased in survivin gene transfectant cells. Phosphorylation of Sp I and c-Myc at serine and threonine residues was enhanced by survivin, while total amounts of these proteins were unchanged. Further, "knockdown" of survivin by a small inhibitory RNA decreased Sp1 and c-Myc phosphorylation. Thus survivin participates not only in inhibition of apoptosis, but also in prolonging cellular lifespan. (c) 2005 Elsevier Inc. All rights reserved.
引用
收藏
页码:300 / 311
页数:12
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