Autonomous right-screw rotation of growth cone filopodia drives neurite turning.

Autonomous right-screw rotation of growth cone filopodia drives neurite turning.
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DOI:
10.1083/jcb.200906043
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发表时间:
2010-02-08
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Kamiguchi H
Kamiguchi H
中科院分区:
其他
文献类型:
--
作者:
Tamada A;Kawase S;Murakami F;Kamiguchi H

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神经突的顺时针旋转是由丝状伪足在延伸和扫过基底层时的旋转引起的。神经突延伸的方向是由各种环境线索控制的。然而,据报道,即使在没有任何外在的方向信号,神经突顺时针旋转的二维基板上。在这项研究中,我们发现了自主旋转运动的生长锥,这提供了一个细胞的基础,固有的神经突转向。我们已经开发出一种技术,用于监测三维运动的生长锥丝状伪足,并证明,一个单独的丝状伪足旋转自己的纵轴上的右螺旋方向的生长锥体的观点。我们还表明,丝足旋转涉及肌球蛋白Va和Vb,并可能是由他们的螺旋相互作用与丝状肌动蛋白。此外,我们提供的证据表明,单方向旋转的丝状伪足的原因偏转神经突伸长,最有可能通过不对称定位的丝状伪足上的基板。虽然生长锥本身被认为是功能对称的,我们的研究揭示了生长锥运动的不对称性。
The clockwise turning of neurites is caused by the rotations of filopodia as they extend and sweep across the substratum. The direction of neurite elongation is controlled by various environmental cues. However, it has been reported that even in the absence of any extrinsic directional signals, neurites turn clockwise on two-dimensional substrates. In this study, we have discovered autonomous rotational motility of the growth cone, which provides a cellular basis for inherent neurite turning. We have developed a technique for monitoring three-dimensional motility of growth cone filopodia and demonstrate that an individual filopodium rotates on its own longitudinal axis in the right-screw direction from the viewpoint of the growth cone body. We also show that the filopodial rotation involves myosins Va and Vb and may be driven by their spiral interactions with filamentous actin. Furthermore, we provide evidence that the unidirectional rotation of filopodia causes deflected neurite elongation, most likely via asymmetric positioning of the filopodia onto the substrate. Although the growth cone itself has been regarded as functionally symmetric, our study reveals the asymmetric nature of growth cone motility.
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