Complex roles for telomeres and telomerase in breast carcinogenesis.

Complex roles for telomeres and telomerase in breast carcinogenesis.
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DOI:
10.1186/bcr553
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发表时间:
2003
期刊:
Breast cancer research : BCR
影响因子:
--
通讯作者:
Artandi SE
Artandi SE
中科院分区:
其他
文献类型:
--
作者:
Artandi SE

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端粒酶是一种赋予细胞无限增殖潜力的酶,它在癌细胞和正常细胞中的表达存在差异。尽管大多数原代人类细胞缺乏端粒酶,但90%以上的浸润性乳腺癌中端粒酶表达上调。因此,在从端粒酶阴性到端粒酶阳性的关键转变过程中,大部分乳腺癌发生在端粒酶重新激活之前。在这一转变过程中,伴随着细胞分裂的端粒缩短可能通过激活检查点和损害染色体稳定性来预防或促进肿瘤的发生。在成熟的癌症中,端粒酶可能通过稳定端粒和支持乳腺癌细胞的不朽生长在肿瘤的进展和维持中发挥关键作用。
Telomerase – an enzyme that endows cells with unlimited proliferative potential – is differentially expressed in cancer cells and in normal cells. Although most primary human cells lack telomerase, the enzyme is upregulated in more than 90% of invasive breast cancers. As a result, much of breast cancer development occurs before telomerase is reactivated during a critical transition from a telomerase-negative to a telomerase-positive state. During this transition, the telomere shortening that accompanies cell division may either prevent or facilitate tumorigenesis by activating checkpoints and impairing chromosomal stability. In mature cancers, telomerase probably serves a crucial role in tumor progression and maintenance by stabilizing telomeres and supporting the immortal growth of breast cancer cells.
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发表时间: 2000-01-01
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