The biomechanical properties of an epithelial tissue determine the location of its vasculature

The biomechanical properties of an epithelial tissue determine the location of its vasculature
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上皮组织的生物力学特性决定其脉管系统的位置

DOI:
10.1038/ncomms13560
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发表时间:
2016
影响因子:
16.6
通讯作者:
Lammert
Lammert
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Schubert;Karsjens;Bartosinska;Eberhard;Jeruschke;Alsteens;Speier;Müller;Lammert

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一个重要的问题是生长的组织如何建立血管网络。在这里,我们研究血管网络的形成,胰岛,内分泌组织来源于胰腺上皮。我们发现,小鼠胰腺上皮细胞中整合素相关激酶(ILK)的耗竭导致葡萄糖耐受不良,这是由于胰岛内血管系统的丧失。反过来,血管聚集在胰岛周围。生物物理实验表明,胰岛细胞的生物力学特性,如肌动球蛋白介导的皮质张力和对内皮细胞的粘附力,均发生了显著变化,但内皮细胞增殖、凋亡、形态、VEGF α表达和VEGF-A分泌均未发生改变,血管基底膜也未出现“空袖”。这些结果表明,分选事件正在驱动内皮细胞和上皮细胞的分离,并表明上皮生物力学性质决定了血管系统是否侵入或破坏生长中的上皮组织。
An important question is how growing tissues establish a blood vessel network. Here we study vascular network formation in pancreatic islets, endocrine tissues derived from pancreatic epithelium. We find that depletion of integrin-linked kinase (ILK) in the pancreatic epithelial cells of mice results in glucose intolerance due to a loss of the intra-islet vasculature. In turn, blood vessels accumulate at the islet periphery. Neither alterations in endothelial cell proliferation, apoptosis, morphology,Vegfaexpression and VEGF-A secretion nor ‘empty sleeves’ of vascular basement membrane are found. Instead, biophysical experiments reveal that the biomechanical properties of pancreatic islet cells, such as their actomyosin-mediated cortex tension and adhesive forces to endothelial cells, are significantly changed. These results suggest that a sorting event is driving the segregation of endothelial and epithelial cells and indicate that the epithelial biomechanical properties determine whether the blood vasculature invades or envelops a growing epithelial tissue.
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