Apoptotic regulation of epithelial cellular extrusion.

Apoptotic regulation of epithelial cellular extrusion.
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DOI:
10.1007/s10495-011-0587-z
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发表时间:
2011-05
期刊:
影响因子:
7.2
通讯作者:
Rosenblatt, Jody
Rosenblatt, Jody
中科院分区:
生物学2区
文献类型:
--
作者:
Andrade, Daniel;Rosenblatt, Jody

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细胞挤出是一种从上皮组织中去除垂死细胞以防止损害其屏障功能的机制。挤出发生在所有观察到的上皮细胞在体内,并可以在体外培养的上皮细胞单层诱导细胞凋亡。我们确定肌动蛋白和肌球蛋白形成一个环,在周围细胞中收缩,驱动细胞挤出。然而,目前尚不清楚是否所有的凋亡途径都导致挤压,以及凋亡和挤压是如何在分子上联系起来的。在这里,我们发现,内在和外在的凋亡途径激活细胞挤压。驱动细胞挤出的收缩力需要半胱天冬酶活性。此外,坏死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细胞中去除。
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.
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