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Tetanus neurotoxin-mediated cleavage of cellubrevin impairs epithelial cell migration and integrin-dependent cell adhesion

机译:破伤风神经毒素介导的纤维素尿素裂解会损害上皮细胞迁移和整联蛋白依赖性细胞粘附

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摘要

A role for endocytosis and exocytosis in cell migration has been proposed but not yet demonstrated. Here, we show that cellubrevin (Cb), an early endosomal v-SNARE, mediates trafficking in the lamellipod of migrating epithelial cells and partially colocalizes with markers of focal contacts. Expression of tetanus neurotoxin, which selectively cleaves Cb, significantly reduced the speed of migrating epithelial cells. Furthermore, expression of tetanus neurotoxin enhanced the adhesion of epithelial cells to collagen, laminin, fibronectin, and E-cadherin; altered spreading on collagen; and impaired the recycling of β1 integrins. These results suggest that Cb-dependent membrane trafficking participates in cell motility through the regulation of cell adhesion.
机译:已经提出了内吞作用和胞吐作用在细胞迁移中的作用,但尚未证明。在这里,我们表明cellubrevin(Cb),一种早期的内体v-SNARE,介导了迁移上皮细胞的lamellipod中的运输,并与局部接触标记物部分共定位。选择性切割Cb的破伤风神经毒素的表达显着降低了上皮细胞的迁移速度。此外,破伤风神经毒素的表达增强了上皮细胞对胶原蛋白,层粘连蛋白,纤连蛋白和E-钙粘蛋白的粘附。改变了胶原蛋白的扩散;并损害了β1整联蛋白的回收。这些结果表明,依赖Cb的膜运输通过调节细胞粘附参与细胞运动。

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