Misexpression of Pknox2 in mouse limb bud mesenchyme perturbs zeugopod development and deltoid crest formation.

Misexpression of Pknox2 in mouse limb bud mesenchyme perturbs zeugopod development and deltoid crest formation.
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小鼠肢芽间充质中 Pknox2 的错误表达扰乱了 Zeugopod 的发育和三角肌嵴的形成

DOI:
10.1371/journal.pone.0064237
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Guo X
Guo X
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zhou W;Zhu H;Zhao J;Li H;Wan Y;Cao J;Zhao H;Yu J;Zhou R;Yao Y;Zhang L;Wang L;He L;Ma G;Yao Z;Guo X

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由Meis、Pbx和Pknox蛋白组成的TALE(三氨基酸环延伸)家族是一组具有非典型同源结构域的转录辅因子,其在肢体发育中起关键作用。与Meis和Pbx蛋白功能的深入研究相比,Pknox 2在肢体发育中的作用仍不清楚。在这里,我们发现Pknox 2主要在E10.5和E11.5的小鼠肢体的zeugopod结构域中表达。Pknox 2在转基因小鼠肢芽间充质中的错误表达导致了zeugopod和前肢茎足动物三角肌嵴的畸形,但使autopod和其他茎足动物骨骼基本完整。这些zeugopod骨骼中的畸形在骨软骨祖细胞中过表达Pknox 2的小鼠中重演。分子和细胞分析表明,Pknox 2在肢芽间充质中的错误表达扰乱了Hox 10 -11基因的表达谱,降低了肢芽中Col 2的表达和Bmp/Smad信号活性。这些结果表明,Pknox 2的错误表达影响间充质凝聚和早期软骨形成分化的zeugopod骨骼的转基因胚胎,这表明Pknox 2作为一个潜在的调节zeugopod和三角肌嵴的形成。
The TALE (Three Amino acid Loop Extension) family consisting of Meis, Pbx and Pknox proteins is a group of transcriptional co-factors with atypical homeodomains that play pivotal roles in limb development. Compared to the in-depth investigations of Meis and Pbx protein functions, the role of Pknox2 in limb development remains unclear. Here, we showed that Pknox2 was mainly expressed in the zeugopod domain of the murine limb at E10.5 and E11.5. Misexpression of Pknox2 in the limb bud mesenchyme of transgenic mice led to deformities in the zeugopod and forelimb stylopod deltoid crest, but left the autopod and other stylopod skeletons largely intact. These malformations in zeugopod skeletons were recapitulated in mice overexpressing Pknox2 in osteochondroprogenitor cells. Molecular and cellular analyses indicated that the misexpression of Pknox2 in limb bud mesenchyme perturbed the Hox10-11 gene expression profiles, decreased Col2 expression and Bmp/Smad signaling activity in the limb. These results indicated that Pknox2 misexpression affected mesenchymal condensation and early chondrogenic differentiation in the zeugopod skeletons of transgenic embryos, suggesting Pknox2 as a potential regulator of zeugopod and deltoid crest formation.
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