Noggin inactivation affects the number and differentiation potential of muscle progenitor cells in vivo.

Noggin inactivation affects the number and differentiation potential of muscle progenitor cells in vivo.
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DOI:
10.1038/srep31949
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发表时间:
2016-08-30
期刊:
影响因子:
4.6
通讯作者:
Tylzanowski P
Tylzanowski P
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Costamagna D;Mommaerts H;Sampaolesi M;Tylzanowski P

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在小鼠中,Noggin(骨形态发生蛋白(BMP)的分泌拮抗剂)的失活导致,除其他外,无骨骨骼的严重畸形和有缺陷的骨骼肌纤维。为了确定表型的分子基础,我们对发育中的肌肉Noggin−/−小鼠进行了组织形态学和分子分析。我们发现,在18.5 dpc的胚胎有一个显着的肌纤维的大小和细胞核迁移到细胞膜的失败减少。在分子上,Noggin的缺乏导致肌肉组织中BMP信号传导增加,如SMAD 1/5/8磷酸化的增加所示,伴随着BMP靶基因如Id 1、2、3以及Msx 1的诱导。最后,去除Noggin后,间充质Pax 7+肌肉前体细胞的数量减少,并且它们更容易在体外分化为脂肪细胞。因此,我们的研究结果强调了头蛋白/BMP平衡对早期胎儿祖细胞肌源性承诺的重要性。
Inactivation of Noggin, a secreted antagonist of Bone Morphogenetic Proteins (BMPs), in mice leads, among others, to severe malformations of the appendicular skeleton and defective skeletal muscle fibers. To determine the molecular basis of the phenotype, we carried out a histomorphological and molecular analysis of developing muscles Noggin−/− mice. We show that in 18.5 dpc embryos there is a marked reduction in muscle fiber size and a failure of nuclei migration towards the cell membrane. Molecularly, the absence of Noggin results in an increased BMP signaling in muscle tissue as shown by the increase in SMAD1/5/8 phosphorylation, concomitant with the induction of BMP target genes such as Id1, 2, 3 as well as Msx1. Finally, upon removal of Noggin, the number of mesenchymal Pax7+ muscle precursor cells is reduced and they are more prone to differentiate into adipocytes in vitro. Thus, our results highlight the importance of Noggin/BMP balance for myogenic commitment of early fetal progenitor cells.
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