Tissue elongation requires oscillating contractions of a basal actomyosin network.

Tissue elongation requires oscillating contractions of a basal actomyosin network.
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组织伸长需要振荡基底肌球蛋白网络的收缩。

DOI:
10.1038/ncb2124
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发表时间:
2010-12
影响因子:
21.3
通讯作者:
Montell, Denise J.
Montell, Denise J.
中科院分区:
生物学1区
文献类型:
--
作者:
He, Li;Wang, Xiaobo;Tang, Ho Lam;Montell, Denise J.

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Understanding how molecular dynamics lead to cellular behaviors that ultimately sculpt organs and tissues is a major challenge not only in basic developmental biology but also in tissue engineering and regenerative medicine. Here we use live imaging to show that the basal surfaces of Drosophila follicle cells undergo a series of directional, oscillating contractions driven by periodic myosin accumulation on a polarized actin network. Inhibition of the actomyosin contractions or their coupling to extracellular matrix (ECM) blocked elongation of the whole tissue, whereas enhancement of the contractions exaggerated it. Myosin accumulated in a periodic manner prior to each contraction and was regulated by the small GTPase Rho, its downstream kinase ROCK and cytosolic calcium. Disrupting the link between the actin cytoskeleton and the ECM decreased, while enhancing cell-ECM adhesion increased, the amplitude and period of the contractions. In contrast, disrupting cell-cell adhesions resulted in loss of the actin network. Our findings reveal a novel mechanism controlling organ shape and a new model for the study of the effects of oscillatory actomyosin activity within a coherent cell sheet.
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