Regulated actin cytoskeleton assembly at filopodium tips controls their extension and retraction.

Regulated actin cytoskeleton assembly at filopodium tips controls their extension and retraction.
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丝状足尖端的调节肌动蛋白细胞骨架组装控制着它们的伸展和收缩。

DOI:
10.1083/jcb.146.5.1097
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发表时间:
1999-09-06
影响因子:
7.8
通讯作者:
Mitchison, T
Mitchison, T
中科院分区:
生物学1区
文献类型:
--
作者:
Mallavarapu, A;Mitchison, T

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丝状伪足响应细胞外信号的伸展和收缩被认为是决定生长锥前进方向的重要初始步骤。我们试图了解肌动蛋白细胞骨架的动态行为如何被调节以产生延伸或收缩。通过观察神经母细胞瘤细胞系生长锥中肌动蛋白丝上基准标记的运动,我们发现丝状伪足的伸展和收缩是由尖端肌动蛋白细胞骨架组装速率和逆行流动之间的平衡控制的。在单个丝状伪足中以及在单个生长锥中的丝状伪足之间,组装和流速都可以随时间变化。组装率的调节是控制我们系统中丝状伪足行为的主导因素。
The extension and retraction of filopodia in response to extracellular cues is thought to be an important initial step that determines the direction of growth cone advance. We sought to understand how the dynamic behavior of the actin cytoskeleton is regulated to produce extension or retraction. By observing the movement of fiduciary marks on actin filaments in growth cones of a neuroblastoma cell line, we found that filopodium extension and retraction are governed by a balance between the rate of actin cytoskeleton assembly at the tip and retrograde flow. Both assembly and flow rate can vary with time in a single filopodium and between filopodia in a single growth cone. Regulation of assembly rate is the dominant factor in controlling filopodia behavior in our system.
DOI: 10.1016/0959-4388(94)90030-2
发表时间: 1994-01-01
影响因子: 5.7
作者:
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