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Microinjection microscope

Company: Leica
Catalog#: DMIL
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Application of Mechanical Forces on Drosophila Embryos by Manipulation of Microinjected Magnetic Particles
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2020-05-05
[Abstract]  Cells generate mechanical forces to shape tissues during morphogenesis. These forces can activate several biochemical pathways and trigger diverse cellular responses by mechano-sensation, such as differentiation, division, migration and apoptosis. Assessing the mechano-responses of cells in living organisms requires tools to apply controlled local forces within biological tissues. For this, we have set up a method to generate controlled forces on a magnetic particle embedded within a chosen tissue of Drosophila embryos. We designed a protocol to inject an individual particle in early embryos and to position it, using a permanent magnet, within the tissue of our choice. Controlled forces in the range of pico to nanonewtons can be applied on the particle with the use of an ... [摘要]  [ 摘要] 电池产生的机械力塑造组织形态发生过程。这些力量可以激活一些生化途径和触发多元化Ç Ellular回应机械性-感,如分化,分裂,迁移和凋亡。评估的机械性-响应细胞在活生物体需要在生物组织内施加受控局部力的工具,为此,我们建立了一种方法来对嵌入果蝇胚胎所选组织内的磁性粒子产生受控力,并设计了将单个粒子注入早期胚胎的方案。并使用永久磁铁将其定位在我们选择的组织内。可以使用事先已校准的电磁体,将微微至纳牛顿范围内的控制力施加到微粒上。施加力后上皮变形可通过实时成像进行跟踪,并使用简单分析进行进一步分析 该工具已成功用于识别胃胚形成之前胚盘中的力学变化。该协议提供了以下细节:(i)在果蝇胚胎中注入磁性粒子,(ii)校准电磁体,以及(iii)在活体组织中施加控制力。

[ 背景] 果蝇胚胎发育是一个经典模型对于形态(坎波斯,奥尔特加和哈滕斯坦,1985年)。尽管许多工具已经开发评估具体蛋白质形态的作用,评估细胞部队或力学仍然具有挑战性。在过去的十五年来,激光解剖是评估细胞力最常用的方法(Colombelli和Solon,2013; Shivakumar和Lenne,2016)。然而,激光解剖是侵入性的,会伤及组织,不利于异位力的施加。。为了克服这些限制,一些方法已经发展到探头的磁流体或通过光阱蜂窝结组织通过诱导变形以液滴的力学(Bambardekar ...

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