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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Notch signaling directly controls cell proliferation in the prosophila wng disc
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Notch signaling directly controls cell proliferation in the prosophila wng disc

机译:Notch信号直接控制益生菌wng盘中的细胞增殖

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摘要

NOtCh signaling is involved in cell differentiation and patterning during morphogenesis. In the Drosophila wing, Notch activity regulates the expression of several genes at the dorsal/ventral boundary, and this is thought to elicit wing-cell proliferation. In this work, we show the effect of clones of cells expressing different forms of several members of the Notch signaling pathway, which result in an alteration of Notch activity. The ectopic expression in clones of activated forms of Notch or of its ligands (Delta or Serrate) in the wing causes outgrowths associated with the ap- pearance of ectopic wing margins. These outgrowths consist of mutant territories and of surrounding wild-type cells. However. the ectopic expression of DelIte. at low levels in ventral clones, causes large outgrowths that are associated neither with the generation of wing margin structures nor with the expression of genes characteristic of the dorsal/ventral boundary. These results suggest that Notch activity is directly involved in cell proliferation. independently of its role in the formation of the dorsal/ventral boundary. We propose that the nonautonomous effects (induction of extraproliferation and vein differentiation in the surrounding wild-type cells) result from pattern accommodation to positional values caused by the ectopic expression of Notch.
机译:NOtCh信号传导参与形态发生过程中的细胞分化和模式。在果蝇的机翼中,Notch活性调节了背侧/腹侧边界上几个基因的表达,这被认为引起了机翼细胞的增殖。在这项工作中,我们显示了表达不同形式的Notch信号通路的几个成员的细胞克隆的效果,这导致Notch活性的改变。异位在机翼的Notch激活形式或其配体(δ或锯齿状)的克隆中异位表达会导致与异位翼缘出现相关的生长。这些产物由突变区和周围的野生型细胞组成。然而。 DelIte的异位表达。在腹侧克隆中水平较低时,会导致较大的生长,这既与机翼边缘结构的产生也不与背/腹边界特征基因的表达相关。这些结果表明Notch活性直接参与细胞增殖。与其在背/腹边界形成中的作用无关。我们提出非自治效应(在周围的野生型细胞中诱导过度增殖和静脉分化)是由模式调节到Notch异位表达引起的位置值引起的。

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