Forces generated by cell intercalation tow epidermal sheets in mammalian tissue morphogenesis.

Forces generated by cell intercalation tow epidermal sheets in mammalian tissue morphogenesis.
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在哺乳动物组织形态发生中,细胞嵌入产生的力牵引表皮片。

DOI:
10.1016/j.devcel.2014.02.011
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发表时间:
2014-03-31
期刊:
影响因子:
11.8
通讯作者:
Fuchs, Elaine
Fuchs, Elaine
中科院分区:
生物学1区
文献类型:
--
作者:
Heller, Evan;Kumar, K. Vijay;Grill, Stephan W.;Fuchs, Elaine

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虽然原肠胚形成运动为集体细胞运动如何塑造发育中的胚胎提供了机械范例,但对发育后期发生的协调细胞运动知之甚少。研究眼睑闭合,我们探讨了一种情况下,上皮局部重塑,扩大,并在另一个上皮移动。实时成像,基因靶向和细胞周期抑制剂揭示,关闭不需要覆盖peridendum,增殖或超细胞肌动蛋白电缆组装。激光消融和组织变形的定量分析进一步区分了创伤修复和背侧闭合的机制。相反,平行于组织前部的细胞夹层局部地垂直压缩它,沿着闭合轴沿着拉动周围的表皮。体内功能分析表明,该机制需要局部肌球蛋白-IIA和α5β1-纤连蛋白介导的迁移,以及可能由Wnt信号刺激的E-钙粘蛋白下调。这些研究揭示了上皮闭合的一种模式,其中细胞嵌入产生的力被用来牵引周围组织。
While gastrulation movements offer mechanistic paradigms for how collective cellular movements shape developing embryos, far less is known about coordinated cellular movements that occur later in development. Studying eyelid closure, we explore a case where an epithelium locally reshapes, expands, and moves over another epithelium. Live imaging, gene targeting and cell cycle inhibitors reveal that closure does not require overlying periderm, proliferation or supracellular actin cable assembly. Laser ablation and quantitative analyses of tissue deformations further distinguish the mechanism from wound-repair and dorsal closure. Rather, cell intercalations parallel to the tissue front locally compress it perpendicularly, pulling the surrounding epidermis along the closure axis. Functional analyses in vivo show that the mechanism requires localized myosin-IIA and α5β1-fibronectin-mediated migration, and E-cadherin downregulation likely stimulated by Wnt signaling. These studies uncover a mode of epithelial closure in which forces generated by cell intercalation are leveraged to tow the surrounding tissue.
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