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首页> 外文期刊>Development >Formation of corneal endothelium is essential for anterior segment development - a transgenic mouse model of anterior segment dysgenesis.
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Formation of corneal endothelium is essential for anterior segment development - a transgenic mouse model of anterior segment dysgenesis.

机译:角膜内皮的形成对于前节发育至关重要-前节发育不良的转基因小鼠模型。

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摘要

The anterior segment of the vertebrate eye is constructed by proper spatial development of cells derived from the surface ectoderm, which become corneal epithelium and lens, neuroectoderm (posterior iris and ciliary body) and cranial neural crest (corneal stroma, corneal endothelium and anterior iris). Although coordinated interactions between these different cell types are presumed to be essential for proper spatial positioning and differentiation, the requisite intercellular signals remain undefined. We have generated transgenic mice that express either transforming growth factor (alpha) (TGF(alpha)) or epidermal growth factor (EGF) in the ocular lens using the mouse (alpha)A-crystallin promoter. Expression of either growth factor alters the normal developmental fate of the innermost corneal mesenchymal cells so that these cells often fail to differentiate into corneal endothelial cells. Both sets of transgenic mice subsequently manifest multiple anterior segment defects, including attachment of the iris and lens to the cornea, a reduction in the thickness of the corneal epithelium, corneal opacity, and modest disorganization in the corneal stroma. Our data suggest that formation of a corneal endothelium during early ocular morphogenesis is required to prevent attachment of the lens and iris to the corneal stroma, therefore permitting the normal formation of the anterior segment.
机译:脊椎动物眼睛的前段是由表面外胚层衍生的细胞在适当的空间发育而构成的,这些细胞变成角膜上皮和晶状体,神经外胚层(后虹膜和睫状体)和颅神经c(角膜基质,角膜内皮和前虹膜) 。尽管推测这些不同细胞类型之间的协同相互作用对于正确的空间定位和分化至关重要,但所需的细胞间信号仍然不确定。我们已经生成了使用小鼠αA-crystallin启动子在眼晶状体中表达转化生长因子α(TGFα)或表皮生长因子(EGF)的转基因小鼠。任一种生长因子的表达都会改变最内侧角膜间充质细胞的正常发育命运,因此这些细胞通常无法分化为角膜内皮细胞。两组转基因小鼠随后均表现出多个前节缺损,包括虹膜和晶状体与角膜的附着,角膜上皮厚度的减少,角膜混浊和角膜基质中的适度混乱。我们的数据表明,在早期眼部形态发生过程中需要形成角膜内皮,以防止晶状体和虹膜附着在角膜基质上,因此可以正常形成前节。

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