Suppressor of Hairless (Su(H)) is Required for Foregut Development in the Sea Urchin Embryo

Suppressor of Hairless (Su(H)) is Required for Foregut Development in the Sea Urchin Embryo
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海胆胚胎前肠发育需要无毛抑制剂 (Su(H))

DOI:
10.2108/zsj.26.686
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发表时间:
2009
期刊:
The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society
影响因子:
--
通讯作者:
Takashi Yamamoto
Takashi Yamamoto
中科院分区:
--
文献类型:
--
作者:
K. Karasawa;N. Sakamoto;Kazumasa Fujita;H. Ochiai;T. Fujii;K. Akasaka;Takashi Yamamoto

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在海胆胚胎中,Notch信号传导需要将非骨骼发育中胚层与早期内中胚层分离,并且参与内胚层发育。为了进一步研究Notch信号传导在内胚层细胞谱系中的作用,我们克隆了无毛抑制因子(HpSu(H))的马粪海胆(Hemicentrotus pulcherrimus)直系同源物的cDNA,其是Notch信号传导途径的主要介质,检查了发育过程中的表达并进行了功能分析。HpSu(H)mRNA在未孵化的囊胚期普遍表达,从孵化的囊胚期开始只在营养板区域表达,然后在原肠胚期在原肠中表达。通过向受精卵中注射HpSu(H)(dn-HpSu(H))mRNA的显性阴性形式来干扰HpSu(H),导致原肠胚中原肠顶端的次级间充质细胞和pluteus幼虫中的色素细胞消失,证实Notch信号传导是非骨骼发生中胚层特化所需的。此外,注射相对高量的dn-HpSu(H)mRNA导致在pluteus阶段的原肠中的前肠的缺陷或萎缩。这一结果强烈表明,Notch信号参与海胆发育过程中的前肠发育。
In sea urchin embryos, Notch signaling is required to segregate non-skeletogenic mesoderm from early endomesoderm, and is involved in endoderm development. To further investigate the role of Notch signaling in the endoderm cell lineage, we cloned a cDNA for the Hemicentrotus pulcherrimus ortholog of Suppressor of Hairless (HpSu(H)), which is a major mediator of the Notch signaling pathway, examined the expression during development and performed a functional analysis. HpSu(H) mRNA was ubiquitously expressed up to the unhatched blastula stage, and expression was exclusively detected in the vegetal plate region from the hatched blastula stage and then in the archenteron at the gastrula stage. Perturbation of HpSu(H) by injection of the dominant negative form of HpSu(H) (dn-HpSu(H)) mRNA into fertilized eggs led to the disappearance of secondary mesenchyme cells at the tip of the archenteron in the gastrula and pigment cells in the pluteus larva, confirming that Notch signaling is required for non-skeletogenic mesoderm specification. In addition, injection of relatively high amounts of dn-HpSu(H) mRNA caused a defect or atrophy of the foregut in the archenteron at the pluteus stage. This result strongly suggests that Notch signaling is involved in foregut development during sea urchin development.
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