Inducible lineage tracing of Pax7-descendant cells reveals embryonic origin of adult satellite cells.

Inducible lineage tracing of Pax7-descendant cells reveals embryonic origin of adult satellite cells.
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DOI:
10.1002/dvg.20630
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发表时间:
2010-07
期刊:
影响因子:
1.5
通讯作者:
Fan, Chen-Ming
Fan, Chen-Ming
中科院分区:
生物学4区
文献类型:
--
作者:
Lepper, Christoph;Fan, Chen-Ming

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我们已经产生了在Pax 7基因座处携带Cre-ERT 2敲入等位基因(Pax 7 CE等位基因)的小鼠品系。结合Pax 7 CE和R26 RLacZ Cre报告等位基因,在这里,我们描述了时间特异性他莫昔芬(TMX)诱导谱系跟踪胚胎Pax 7表达细胞。特别是,我们专注于体节谱系。由Pax 7 CE等位基因指导的Tmx诱导的Cre活性与内源性Pax 7表达模式相似。在胚胎第9.5天(E9.5)选择性标记的体细胞Pax 7表达细胞产生背部真皮和棕色脂肪组织,除了躯干肌肉和膈肌的背部方面。然而,它们对腹侧体壁和肢体肌肉没有贡献。在E12.5之后,标记的Pax 7表达细胞变得谱系局限于肌肉。这些早期标记的Pax 7表达细胞的后代开始占据与E16.5周围的肌纤维相关的层下位置,这是胚胎卫星细胞的特征。此外,他们有助于成人肌纤维和再生能力的卫星细胞在胫骨前肌,提供证据表明,一些成人卫星细胞是胚胎起源的。
We have generated a mouse strain carrying a Cre-ERT2 knock-in allele at the Pax7 locus, the Pax7CE allele. Combining Pax7CE and the R26RLacZ Cre reporter allele, here we describe temporal-specific tamoxifen (tmx)-inducible lineage tracing of embryonic Pax7-expressing cells. In particular, we focus on the somitic lineage. Tmx-inducible Cre activity directed by the Pax7CE allele is similar to the endogenous Pax7 expression pattern. The somitic Pax7-expressing cells selectively marked at embryonic day 9.5 (E9.5) give rise to dorsal dermis and brown adipose tissue, in addition to dorsal aspects of trunk muscles and the diaphragm muscle. However, they do not contribute to ventral body wall and limb muscles. After E12.5, marked Pax7-expressing cells become lineage restricted to muscles. Descendants of these early marked Pax7-expressing cells begin to occupy sublaminal positions associated with the myofibers around E16.5, characteristic of embryonic satellite cells. Furthermore, they contribute to adult myofibers and regeneration competent satellite cells in the tibialis anterior muscle, providing evidence that some adult satellite cells are of embryonic origin.
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