Calcium flickers steer cell migration.

Calcium flickers steer cell migration.
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钙闪烁引导细胞迁移

DOI:
10.1038/nature07577
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发表时间:
2009-02-12
期刊:
影响因子:
64.8
通讯作者:
Cheng, Heping
Cheng, Heping
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wei, Chaoliang;Wang, Xianhua;Chen, Min;Ouyang, Kunfu;Song, Long-Sheng;Cheng, Heping

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在空间、时间和浓度上组织良好的钙信号对于定向运动是必不可少的,这在发育期间对所有细胞类型都是常见的,并且对于损伤后的组织重塑和再生至关重要。然而,迄今为止,它仍然令人困惑的钙如何调节的动态领先的板层,这是一个迁移细胞的信号和运动中心,包含许多效应蛋白,需要高水平的钙激活。在这里,我们第一次看到了高钙微区(“钙闪烁”),它在迁移成纤维细胞的前板层最活跃,显示出与整体钙梯度相反的4:1的前后极化(图)。钙闪烁活性与膜张力(通过TRPM 7,瞬时受体电位超家族的牵张激活的Ca 2+渗透通道)和化学引诱物信号转导(通过2型肌醇1,4,5-三磷酸受体)双重偶联。有趣的是,当暴露于与细胞运动垂直的PDGF梯度时,不对称的钙闪烁活性在整个板层中发展,并促进迁移成纤维细胞的转向。这些发现说明了钙微区的精致时空组织如何协调复杂的细胞过程,如细胞迁移。
Well-organized calcium signal in space, time and concentration is essential to directional movement, which is common to all cell types during development and critical to tissue remodeling and regeneration after damage. However, to date, it remains perplexing how calcium regulates the dynamics of leading lamella, which is the signalling and motility centre of a migrating cell, contains numerous effector proteins that require high levels of calcium for activation. Here we visualise, for the first time, high-calcium microdomains (‘‘calcium flickers’’), which are most active at the leading lamella of migrating fibroblasts, displaying a 4: 1 front-to-rear polarisation opposite to the global calcium gradient (Fig). Calcium flicker activity is dually coupled to membrane tension (via TRPM7, a stretch-activated Ca2+-permeant channel of the transient receptor potential superfamily) and chemoattractant signal transduction (via type 2 inositol 1, 4, 5-trisphosphate receptors). Interestingly, when exposed to a PDGF gradient perpendicular to cell movement, asymmetric calcium flicker activity develops across the lamella and promotes the turning of migrating fibroblasts. These findings illustrate how the exquisite spatiotemporal organisation of calcium microdomains can orchestrate complex cellular processes such as cell migration.
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