Mechanism of lateral movement of filopodia and radial actin bundles across neuronal growth cones.

Mechanism of lateral movement of filopodia and radial actin bundles across neuronal growth cones.
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丝状伪足和放射状肌动蛋白束穿过神经元生长锥的横向运动机制。

DOI:
10.1016/s0006-3495(00)76675-6
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发表时间:
2000
影响因子:
3.4
通讯作者:
Danuser,G
Danuser,G
中科院分区:
生物学3区
文献类型:
--
作者:
Oldenbourg,R;Katoh,K;Danuser,G

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我们使用偏振光图像的延时序列研究了运动细胞板状伪足中丝状伪足和肌动蛋白束的运动。我们测量了肌动蛋白网络的逆行速度以及片状足的丝状伪足和肌动蛋白束的横向运动。注意到横向移动的丝状伪足和肌动蛋白束总是相对于逆流方向倾斜,我们提出了一个简单的横向运动机制的几何模型。该模型建立了肌动蛋白束横向运动的速度、它们相对于逆行流方向的倾斜角以及板状足中逆行流的速度之间的关系。我们的实验结果验证了模型的定量预测。此外,我们的观察结果支持这样的假设:丝状伪足的横向运动是由倾斜肌动蛋白束的逆行流动及其通过丝状伪足内肌动蛋白束顶端的肌动蛋白聚合而生长引起的。因此,我们得出结论,倾斜丝状伪足和肌动蛋白束的横向运动不需要单独的运动机制,而是逆行流动以及片状伪足前缘附近肌动蛋白丝和肌动蛋白束组装的结果。
We investigated the motion of filopodia and actin bundles in lamellipodia of motile cells, using time-lapse sequences of polarized light images. We measured the velocity of retrograde flow of the actin network and the lateral motion of filopodia and actin bundles of the lamellipodium. Upon noting that laterally moving filopodia and actin bundles are always tilted with respect to the direction of retrograde flow, we propose a simple geometric model for the mechanism of lateral motion. The model establishes a relationship between the speed of lateral motion of actin bundles, their tilt angle with respect to the direction of retrograde flow, and the speed of retrograde flow in the lamellipodium. Our experimental results verify the quantitative predictions of the model. Furthermore, our observations support the hypothesis that lateral movement of filopodia is caused by retrograde flow of tilted actin bundles and by their growth through actin polymerization at the tip of the bundles inside the filopodia. Therefore we conclude that the lateral motion of tilted filopodia and actin bundles does not require a separate motile mechanism but is the result of retrograde flow and the assembly of actin filaments and bundles near the leading edge of the lamellipodium.
DOI: 10.1091/mbc.10.1.197
发表时间: 1999-01-01
影响因子: 3.3
作者:
Katoh, K;Hammar, K;Oldenbourg, R
通讯作者: Oldenbourg, R
用偏振光观察有丝分裂纺锤体精细结构。
DOI: 10.1086/bblv191n2p271
发表时间: 1996
期刊: The Biological bulletin
影响因子: --
作者:
P. Tran;E. Salmon;R. Oldenbourg
通讯作者: R. Oldenbourg
DOI: 10.1111/j.1365-2818.1995.tb03669.x
发表时间: 1995-11-01
期刊: JOURNAL OF MICROSCOPY-OXFORD
影响因子: --
作者:
OLDENBOURG, R;MEI, G
通讯作者: MEI, G
边缘双折射分析。
DOI: 10.1016/s0006-3495(91)82092-6
发表时间: 1991
影响因子: 3.4
作者:
Oldenbourg,R
通讯作者: Oldenbourg,R
神经元生长锥上微刺运动的分析
DOI: --
发表时间: 1985
影响因子: 5.3
作者:
D. Bray;K. Chapman
通讯作者: K. Chapman