Telomerase deficiency and telomere dysfunction inhibit mammary tumors induced by polyomavirus middle T oncogene

Telomerase deficiency and telomere dysfunction inhibit mammary tumors induced by polyomavirus middle T oncogene
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DOI:
10.1038/onc.2009.268
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发表时间:
2009-12-03
期刊:
影响因子:
8
通讯作者:
Gong, J.
Gong, J.
中科院分区:
医学1区
文献类型:
--
作者:
Jaskelioff, M.;Song, W.;Gong, J.

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MUC1(粘蛋白1)和多瘤病毒中T(PyMT)转基因小鼠在15周内形成乳腺癌,外显率100%。 PyMT 诱导的乳腺肿瘤发生与端粒酶的强表达和活性密切相关。为了评估端粒酶激活和端粒维持在乳腺癌肿瘤发生中的作用,我们在 C57BL/6 背景上生成了表达 MUC1 和 PyMT 的小鼠(MMT 小鼠),但缺乏端粒酶 RNA 成分 mTerc。 mTerc(-/-)MMT 小鼠的连续代间杂交产生了端粒逐渐变短的群体,并对其乳腺肿瘤的形成进行了审核。相对于MMT(N=14)和G0 mTerc(+/-)雌性对照(G0=14),mTerc(-/-)MMT雌性(G1=11,G2=15,G3=15和G4=5)表现出肿瘤体积减小和肿瘤潜伏期增加-MMT=95.6天; G0 mTerc(+/-) MMT=98.6 天,而 G1、G2、G3 和 G4 mTerc(-/-) MMT 小鼠的潜伏期分别为 122.6、138.9、140.7 和 220.9 天(对照与 G1-G4、P
Mice transgenic for MUC1 (mucin 1) and polyomavirus middle T (PyMT) develop mammary carcinomas within 15 weeks with 100% penetrance. PyMT-induced mammary tumorigenesis is closely correlated with robust telomerase expression and activity. To assess the role of telomerase activation and telomere maintenance in mammary carcinoma tumorigenesis, we generated mice expressing MUC1 and PyMT (MMT mice) but deficient in the telomerase RNA component, mTerc, on the C57BL/6 background. Successive generational intercrosses of mTerc(-/-)MMT mice produced cohorts with progressively shorter telomeres that were audited for mammary tumor formation. Relative to MMT (N=14) and G0 mTerc(+/-) female controls (G0=14), mTerc(-/-)MMT females (G1=11, G2=15, G3=15 and G4=5) showed decreased tumor volumes and increased tumor latency-MMT=95.6 days; G0 mTerc(+/-) MMT=98.6 days versus G1, G2, G3 and G4 mTerc(-/-)MMT mice with latencies of 122.6, 138.9, 140.7 and 220.9 days, respectively (controls versus G1-G4, P