Ablation of coactivator Med1 switches the cell fate of dental epithelia to that generating hair.

Ablation of coactivator Med1 switches the cell fate of dental epithelia to that generating hair.
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共激活剂 Med1 的消融将牙上皮细胞的命运转变为生成毛发的细胞。

DOI:
10.1371/journal.pone.0099991
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Oda Y
Oda Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yoshizaki K;Hu L;Nguyen T;Sakai K;He B;Fong C;Yamada Y;Bikle DD;Oda Y

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细胞命运由特定的转录程序决定。在这里,我们提供的证据表明,转录辅激活因子,介体1(Med1),是必不可少的细胞命运的决定外胚层上皮。Med1在体内的条件性缺失将牙上皮转化为表皮上皮,导致釉质器官发育缺陷,同时促进切牙中的毛发形成。我们确定了在Med1缺陷的切牙中产生毛发的多个过程:1)缺乏Med1的牙上皮干细胞不能定向于牙谱系,2)Sox 2表达干细胞延伸到分化区并由于减少的Notch 1信号传导而保持多能性,以及3)如在牙上皮细胞培养物中所证明的,表皮命运由钙诱导。这些结果表明,Med1是成体干细胞中支配上皮细胞命运的主要调节因子。
Cell fates are determined by specific transcriptional programs. Here we provide evidence that the transcriptional coactivator, Mediator 1 (Med1), is essential for the cell fate determination of ectodermal epithelia. Conditional deletion of Med1 in vivo converted dental epithelia into epidermal epithelia, causing defects in enamel organ development while promoting hair formation in the incisors. We identified multiple processes by which hairs are generated in Med1 deficient incisors: 1) dental epithelial stem cells lacking Med 1 fail to commit to the dental lineage, 2) Sox2-expressing stem cells extend into the differentiation zone and remain multi-potent due to reduced Notch1 signaling, and 3) epidermal fate is induced by calcium as demonstrated in dental epithelial cell cultures. These results demonstrate that Med1 is a master regulator in adult stem cells to govern epithelial cell fate.
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