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Apoptotic regulation of epithelial cellular extrusion

机译:上皮细胞挤压的凋亡调控

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摘要

Cellular extrusion is a mechanism that removes dying cells from epithelial tissues to prevent compromising their barrier function. Extrusion occurs in all observed epithelia in vivo and can be modeled in vitro by inducing apoptosis in cultured epithelial monolayers. We established that actin and myosin form a ring that contracts in the surrounding cells that drives cellular extrusion. It is not clear, however, if all apoptotic pathways lead to extrusion and how apoptosis and extrusion are molecularly linked. Here, we find that both intrinsic and extrinsic apoptotic pathways activate cellular extrusion. The contraction force that drives cellular extrusion requires caspase activity. Further, necrosis does not trigger the cellular extrusion response, but instead necrotic cells are removed from epithelia by a passive, stochastic movement of epithelial cells.
机译:细胞挤压是一种从上皮组织中去除濒死细胞以防止损害其屏障功能的机制。挤出发生在体内所有观察到的上皮中,并且可以通过在培养的上皮单层中诱导细胞凋亡在体外进行建模。我们确定肌动蛋白和肌球蛋白形成一个环,该环在周围细胞中收缩,从而驱动细胞挤出。但是,尚不清楚是否所有的凋亡途径都导致挤压以及细胞凋亡和挤压如何分子连接。在这里,我们发现内在和外在的凋亡途径都激活细胞挤压。驱动细胞挤压的收缩力需要胱天蛋白酶活性。此外,坏死并不触发细胞挤出反应,而是通过上皮细胞的被动,随机运动将坏死细胞从上皮中去除。

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