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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Telomerase extends the lifespan of virus-transformed human cells wirthout net telomere lengthening
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Telomerase extends the lifespan of virus-transformed human cells wirthout net telomere lengthening

机译:端粒酶可延长病毒转化的人类细胞的寿命,而不会延长端粒

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摘要

Human fibroblasts whose lifespan in culture Ias been extended by expression of a viral oncogene eventually undergo a growth crisis marked by failure to proliferate. It has been Proposed that telomere shortening in these cells is the froperty that limits their proliferation. Here we report that ectopic expression of the wild-type reverse transcriptase protein (hTERT) of human telomerase averts crisis, at the same time reducing the frequency of dicentric and abnormal chromosomes. Surprisingly, as the resulting immortalized cells containing active telomerase continue to proliferate, their telomeres continue to shorten to mean lengths below those in control cells that enter crisis. These results Provide evidence for a protective function of human telomerase that allows cell groliferation without requiring net lengthening of telomeres.
机译:通过病毒癌基因的表达延长了其在文化中的寿命的人类成纤维细胞最终经历了以增殖失败为标志的生长危机。已经提出,这些细胞中端粒的缩短是限制它们增殖的热熔。在这里我们报告人类端粒酶的野生型逆转录酶蛋白(hTERT)的异位表达避免了危机,同时减少了双着丝粒和异常染色体的频率。令人惊讶的是,随着含有活性端粒酶的永生化细胞继续增殖,其端粒继续缩短至平均长度,使其低于进入危机的对照细胞的平均长度。这些结果提供了人类端粒酶的保护功能的证据,该功能允许细胞增殖而不需要端粒的净延长。

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