Apoptosis propagates through the cytoplasm as trigger waves.
Apoptosis propagates through the cytoplasm as trigger waves.
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DOI:
10.1126/science.aah4065
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发表时间:
2018-08-10
期刊:
影响因子:
--
通讯作者:
Ferrell JE Jr
中科院分区:
文献类型:
--
作者:
Cheng X;Ferrell JE Jr
Apoptosis is an evolutionarily conserved form of programmed cell death critical for development and tissue homeostasis in animals. There are several positive feedback loops in the apoptotic control network, which could allow apoptosis to spread through the cytoplasm in self-regenerating trigger waves. We tested this possibility in cell-free Xenopus laevis egg extracts, and observed apoptotic trigger waves with speeds of ~30 μm/min. Fractionation and inhibitor studies implicated multiple feedback loops in generating the waves. Apoptotic oocytes and eggs exhibited surface waves with speeds of ~30 μm/min, which were tightly correlated with caspase activation. Thus apoptosis spreads through trigger waves in both extracts and intact cells. Our findings emphasize the importance of trigger waves in cell signaling, allowing diverse all-or-none decisions to propagate over large distances without decreasing in speed or amplitude. Apoptosis propagates through cytoplasm as self-regenerating trigger waves, which spread without slowing down or petering out.
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