Insulin-like factor regulates neural induction through an IGF1 receptor-independent mechanism.

Insulin-like factor regulates neural induction through an IGF1 receptor-independent mechanism.
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胰岛素样因子通过IGF1受体独立的机制调节神经诱导。

DOI:
10.1038/srep11603
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发表时间:
2015-06-26
期刊:
影响因子:
4.6
通讯作者:
Asashima M
Asashima M
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Haramoto Y;Takahashi S;Oshima T;Onuma Y;Ito Y;Asashima M

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胰岛素受体(IR)和胰岛素样生长因子 - 1受体(IGF1R)信号传导是正常胚胎生长和发育所必需的。先前的报道表明,IGF/IGF1R/MAPK通路有助于神经诱导,而IGF/IGF1R/PI3K/Akt通路有助于眼睛发育。在此,我们报道了胰岛素3(insulin3)的分离,它编码一种参与神经诱导的新型胰岛素样配体。胰岛素3与胰岛素原和成熟的IGF配体具有相似的结构,但不能激活IGF1受体。然而,与IGFs类似,胰岛素3通过抑制Wnt信号传导诱导了前神经标记物otx2的基因表达,并使前头结构增大。当otx2被胰岛素3诱导时,胰岛素3主要定位于内质网。胰岛素3减少了细胞外Wnt和细胞表面定位的Lrp6。这些结果表明,胰岛素3是一种新型的Wnt信号传导的细胞自主性抑制剂。这项研究首次提供了证据,表明一种胰岛素样因子通过一种不依赖IGF1R的机制调节神经诱导。
Insulin receptor (IR) and insulin-like growth factor-1 receptor (IGF1R) signalling is required for normal embryonic growth and development. Previous reports indicated that the IGF/IGF1R/MAPK pathway contributes to neural induction and the IGF/IGF1R/PI3K/Akt pathway to eye development. Here, we report the isolation of insulin3 encoding a novel insulin-like ligand involved in neural induction. Insulin3 has a similar structure to pro-insulin and mature IGF ligands, but cannot activate the IGF1 receptor. However, similar to IGFs, Insulin3 induced the gene expression of an anterior neural marker, otx2, and enlarged anterior head structures by inhibiting Wnt signalling. Insulin3 are predominantly localised to the endoplasmic reticulum when otx2 is induced by insulin3. Insulin3 reduced extracellular Wnts and cell surface localised Lrp6. These results suggest that Insulin3 is a novel cell-autonomous inhibitor of Wnt signalling. This study provides the first evidence that an insulin-like factor regulates neural induction through an IGF1R-independent mechanism.
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