Rapamycin rescues BMP mediated midline craniosynostosis phenotype through reduction of mTOR signaling in a mouse model.

Rapamycin rescues BMP mediated midline craniosynostosis phenotype through reduction of mTOR signaling in a mouse model.
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雷帕霉素通过减少小鼠模型中的 mTOR 信号传导来挽救 BMP 介导的中线颅缝早闭表型

DOI:
10.1002/dvg.23220
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发表时间:
2018-06
期刊:
Genesis (New York, N.Y. : 2000)
影响因子:
--
通讯作者:
Mishina Y
Mishina Y
中科院分区:
其他
文献类型:
--
作者:
Kramer K;Yang J;Swanson WB;Hayano S;Toda M;Pan H;Kim JK;Krebsbach PH;Mishina Y

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颅缝早闭是指一条或多条颅缝的先天性过早融合。虽然大约30%的病例的遗传基础是已知的,但其余病例的不同表现的致病基因是未知的。最近发现的颅缝干细胞群提供了一个机会,以确定早期信号通路,有助于颅缝早闭。我们以前证明,神经嵴细胞(caA3突变体)中增强的BMP信号传导导致过早的颅缝融合,导致中线颅缝早闭。由于神经嵴细胞中增强的mTOR信号传导导致颅面骨病变,我们研究了mTOR信号传导通过影响缝线干细胞群参与BMP介导的颅缝早闭发病机制的程度。我们的研究结果表明,在新生阶段的caA3突变小鼠的缝合干细胞的损失。我们已经发现在胚胎阶段caA3突变小鼠中mTOR信号的激活增加,但在新生儿阶段没有。我们的研究表明,通过雷帕霉素以时间特异性方式抑制mTOR信号传导部分挽救了缝线干细胞群的损失。这项研究提供了深入了解如何增强BMP信号调节缝线干细胞通过mTOR激活。
Craniosynostosis is defined as congenital premature fusion of one or more cranial sutures. While the genetic basis for about 30% of cases is known, the causative genes for the diverse presentations of the remainder of cases are unknown. The recently discovered cranial suture stem cell population affords an opportunity to identify early signaling pathways that contribute to craniosynostosis. We previously demonstrated that enhanced BMP signaling in neural crest cells (caA3 mutants) leads to premature cranial suture fusion resulting in midline craniosynostosis. Since enhanced mTOR signaling in neural crest cells leads to craniofacial bone lesions, we investigated the extent to which mTOR signaling is involved in the pathogenesis of BMP‐mediated craniosynostosis by affecting the suture stem cell population. Our results demonstrate a loss of suture stem cells in the caA3 mutant mice by the newborn stage. We have found increased activation of mTOR signaling in caA3 mutant mice during embryonic stages, but not at the newborn stage. Our study demonstrated that inhibition of mTOR signaling via rapamycin in a time specific manner partially rescued the loss of the suture stem cell population. This study provides insight into how enhanced BMP signaling regulates suture stem cells via mTOR activation.
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