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:
影响因子:
--
通讯作者:
De Luca M
中科院分区:
文献类型:
--
作者:
Barbaro V;Testa A;Di Iorio E;Mavilio F;Pellegrini G;De Luca M
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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DOI:
10.1073/pnas.82.16.5390
发表时间:
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影响因子:
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作者:
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通讯作者:
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