The plasma membrane flattens out to fuel cell-surface growth during Drosophila cellularization.

The plasma membrane flattens out to fuel cell-surface growth during Drosophila cellularization.
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DOI:
10.1016/j.devcel.2013.11.006
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发表时间:
2013-12-23
期刊:
影响因子:
11.8
通讯作者:
Sokac, Anna Marie
Sokac, Anna Marie
中科院分区:
生物学1区
文献类型:
--
作者:
Figard, Lauren;Xu, Heng;Garcia, Hernan G.;Golding, Ido;Sokac, Anna Marie

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Cell shape change demands cell surface growth, but how growth is fueled and choreographed is still debated. Here, we use cellularization, the first complete cytokinetic event in Drosophila embryos, to show that cleavage furrow ingression is kinetically coupled to the loss of surface microvilli. We modulate furrow kinetics with RNAi against the Rho1-GTPase regulator slam, and show that furrow ingression controls the rate of microvillar depletion. Finally, we directly track microvillar membrane and see it move along the cell surface and into ingressing furrows, independent of endocytosis. Together, our results demonstrate that the kinetics of the ingressing furrow regulate the utilization of a microvillar membrane reservoir. Since the membrane of the furrow and microvilli are contiguous, we suggest that ingression drives unfolding of the microvilli and incorporation of microvillar membrane into the furrow. We conclude that plasma membrane folding/unfolding can contribute to the cell shape changes that promote embryonic morphogenesis.
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