High speed, three-dimensional imaging reveals chemotactic behavior specific to human-infective Leishmania parasites

High speed, three-dimensional imaging reveals chemotactic behavior specific to human-infective Leishmania parasites
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高速三维成像揭示了人类感染性利什曼原虫寄生虫特有的趋化行为

DOI:
10.1101/2020.07.30.220541
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发表时间:
2020
期刊:
--
影响因子:
--
通讯作者:
Findlay R
Findlay R
中科院分区:
--
文献类型:
--
作者:
Findlay R

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细胞运动是一个古老的真核生物特征,在整个门中普遍存在,在捕食者避免、资源获取和竞争中扮演着重要角色。鞭毛在各种寄生原生动物中都有运动,在寄生虫生活史中观察到鞭毛的形态变化。我们研究了这些变化对生命周期各阶段运动性的影响,以及这些变化如何有助于人类感染。我们使用全息显微镜对利什曼原虫不同周期阶段的游动细胞进行了三维成像。我们发现,人类感染(超环型前鞭毛体)在没有刺激的情况下表现出“奔跑和翻滚”的行为,这让人想起细菌的运动,并且它们特异性地改变游泳方向和速度,以针对宿主免疫细胞来反应巨噬细胞衍生的刺激。非感染性(原循环前鞭毛体)细胞沿着蜿蜒的螺旋路径游得更慢。这些发现表明游泳表型和对人类细胞的趋化性是适应的。
Cellular motility is an ancient eukaryotic trait, ubiquitous across phyla with roles in predator avoidance, resource access, and competition. Flagellar motility is seen in various parasitic protozoans, and morphological changes in flagella during the parasite life cycle have been observed. We studied the impact of these changes on motility across life cycle stages, and how such changes might serve to facilitate human infection. We used holographic microscopy to image swimming cells of differentLeishmania mexicanalife cycle stages in three dimensions. We find that the human-infective (metacyclic promastigote) forms display ‘run and tumble’ behaviour in the absence of stimulus, reminiscent of bacterial motion, and that they specifically modify swimming direction and speed to target host immune cells in response to a macrophage-derived stimulus. Non-infective (procyclic promastigote) cells swim more slowly, along meandering helical paths. These findings demonstrate adaptation of swimming phenotype and chemotaxis towards human cells.
DOI: 10.1002/adfm.201706660
发表时间: 2018-06-20
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