Analysis of sphingosine-1-phosphate signaling mutants reveals endodermal requirements for the growth but not dorsoventral patterning of jaw skeletal precursors.

Analysis of sphingosine-1-phosphate signaling mutants reveals endodermal requirements for the growth but not dorsoventral patterning of jaw skeletal precursors.
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分析鞘氨醇1-磷酸信号传导突变体揭示了颌骨骨骼前体的生长,但没有背腹形图案。

DOI:
10.1016/j.ydbio.2011.12.010
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发表时间:
2012-02-15
影响因子:
2.7
通讯作者:
Crump JG
Crump JG
中科院分区:
生物学3区
文献类型:
--
作者:
Balczerski B;Matsutani M;Castillo P;Osborne N;Stainier DY;Crump JG

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头部骨骼的发育涉及到颅神经脊细胞(CNCC)与周围的咽内胚层和外胚层之间的相互作用。尽管在鸟类身上的优雅实验已经显示内胚层在面部骨骼发育中的突出作用,但内胚层在骨骼前体的生长与区域身份识别中的相对功能仍然不清楚。在这里,我们描述了斑马鱼中新的头面部缺陷,该缺陷含有鞘氨醇-1-磷酸(S1P)2型受体(S1PR2)或S1P转运体Spinster 2(Spns2)突变,并表明S1P信号在内胚层中对颌骨的正常生长和定位起作用。令人惊讶的是,对S1PR2和spns2突变体以及完全缺乏内胚层的sox32突变体的分析表明,即使在没有内胚层的情况下,颌骨前体的背腹(DV)模式也基本不受影响。相反,我们观察到成纤维细胞生长因子8a(Fgf8a)的外胚层表达减少,转基因ShHA的错误表达恢复了Fgf8a的表达,并部分挽救了颌骨前体细胞的生长和分化。因此,我们认为S1P依赖的前肠前内胚层主要通过Shh来调节斑马鱼颌骨前体的生长,而不是DV模式。
Development of the head skeleton involves reciprocal interactions between cranial neural crest cells (CNCCs) and the surrounding pharyngeal endoderm and ectoderm. Whereas elegant experiments in avians have shown a prominent role for the endoderm in facial skeleton development, the relative functions of the endoderm in growth versus regional identity of skeletal precursors have remained unclear. Here we describe novel craniofacial defects in zebrafish harboring mutations in the Sphingosine-1-phospate (S1P) type 2 receptor (s1pr2) or the S1P transporter Spinster 2 (spns2), and we show that S1P signaling functions in the endoderm for the proper growth and positioning of the jaw skeleton. Surprisingly, analysis of s1pr2 and spns2 mutants, as well as sox32 mutants that completely lack endoderm, reveals that the dorsal-ventral (DV) patterning of jaw skeletal precursors is largely unaffected even in the absence of endoderm. Instead, we observe reductions in the ectodermal expression of Fibroblast growth factor 8a (Fgf8a), and transgenic misexpression of Shha restores fgf8a expression and partially rescues the growth and differentiation of jaw skeletal precursors. Hence, we propose that the S1P-dependent anterior foregut endoderm functions primarily through Shh to regulate the growth but not DV patterning of zebrafish jaw precursors.
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