C/EBPdelta regulates cell cycle and self-renewal of human limbal stem cells.

C/EBPdelta regulates cell cycle and self-renewal of human limbal stem cells.
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DOI:
10.1083/jcb.200703003
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发表时间:
2007-06-18
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
De Luca M
De Luca M
中科院分区:
其他
文献类型:
--
作者:
Barbaro V;Testa A;Di Iorio E;Mavilio F;Pellegrini G;De Luca M

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人的角膜缘干细胞产生向心迁移的运输扩增祖细胞,以再生角膜上皮。CCAAT增强子结合蛋白δ(C/EBPδ)、Bmi1和ΔNp63α的共同表达鉴定了有丝分裂静止的角膜缘干细胞,这些细胞在培养中产生全克隆。在角膜损伤时,这些细胞中的一部分关闭C/eBPδ和Bmi1,增殖并分化为成熟的角膜细胞。强制表达C/eBPδ可通过激活p27Kip1和p57kip2抑制角膜缘原代细胞生长,延长细胞周期。这些影响是可逆的;不会改变角膜缘细胞的增殖能力;也不是由于细胞凋亡、衰老或分化所致。C/eBPδ,而不是ΔNp63α,无限期地促进全克隆自我更新并阻止克隆进化,这表明自我更新和增殖在角膜缘干细胞中是不同的,尽管是相关的过程。C/eBPδ被招募到正调控基因(p27Kip1和p57Kip2)和负调控基因(p16INK4A和总蛋白)的染色质中,提示该转录因子在决定角膜缘干细胞特性方面起着直接作用。
Human limbal stem cells produce transit amplifying progenitors that migrate centripetally to regenerate the corneal epithelium. Coexpression of CCAAT enhancer binding protein δ (C/EBPδ), Bmi1, and ΔNp63α identifies mitotically quiescent limbal stem cells, which generate holoclones in culture. Upon corneal injury, a fraction of these cells switches off C/EBPδ and Bmi1, proliferates, and differentiates into mature corneal cells. Forced expression of C/EBPδ inhibits the growth of limbal colonies and increases the cell cycle length of primary limbal cells through the activity of p27Kip1 and p57Kip2. These effects are reversible; do not alter the limbal cell proliferative capacity; and are not due to apoptosis, senescence, or differentiation. C/EBPδ, but not ΔNp63α, indefinitely promotes holoclone self-renewal and prevents clonal evolution, suggesting that self-renewal and proliferation are distinct, albeit related, processes in limbal stem cells. C/EBPδ is recruited to the chromatin of positively (p27Kip1 and p57Kip2) and negatively (p16INK4A and involucrin) regulated gene loci, suggesting a direct role of this transcription factor in determining limbal stem cell identity.
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