Properties of the force exerted by filopodia and lamellipodia and the involvement of cytoskeletal components.

Properties of the force exerted by filopodia and lamellipodia and the involvement of cytoskeletal components.
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DOI:
10.1371/journal.pone.0001072
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发表时间:
2007-10-24
期刊:
影响因子:
3.7
通讯作者:
Torre V
Torre V
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Cojoc D;Difato F;Ferrari E;Shahapure RB;Laishram J;Righi M;Di Fabrizio EM;Torre V

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在神经元分化过程中,板状伪足和丝状伪足探索环境,寻找通往轴突最终目的地的正确路径。虽然板状伪足和丝状伪足的运动已经在一定程度上得到了表征,但对它们所施加的力知之甚少。在这项研究中,我们使用光镊测量力的丝状伪足和板状伪足与毫秒的时间分辨率。我们发现,一个单一的丝状伪足施加的力不超过3 pN,而片状伪足可以施加的力高达20 pN。使用代谢抑制剂,我们发现,没有力产生的肌动蛋白聚合的情况下,大于3 pN的力的发展需要微管聚合。这些结果表明,肌动蛋白聚合是必要的力的产生,并表明,不仅做神经元处理信息,但他们也对他们的环境施加力从十分之一pN到几十pN不等。
During neuronal differentiation, lamellipodia and filopodia explore the environment in search for the correct path to the axon's final destination. Although the motion of lamellipodia and filopodia has been characterized to an extent, little is known about the force they exert. In this study, we used optical tweezers to measure the force exerted by filopodia and lamellipodia with a millisecond temporal resolution. We found that a single filopodium exerts a force not exceeding 3 pN, whereas lamellipodia can exert a force up to 20 pN. Using metabolic inhibitors, we showed that no force is produced in the absence of actin polymerization and that development of forces larger than 3 pN requires microtubule polymerization. These results show that actin polymerization is necessary for force production and demonstrate that not only do neurons process information, but they also act on their environment exerting forces varying from tenths pN to tens of pN.
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