A dual-labeling probe to track functional mitochondria-lysosome interactions in live cells.

A dual-labeling probe to track functional mitochondria-lysosome interactions in live cells.
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DOI:
10.1038/s41467-020-20067-6
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发表时间:
2020-12-08
影响因子:
16.6
通讯作者:
Diao J
Diao J
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Chen Q;Fang H;Shao X;Tian Z;Geng S;Zhang Y;Fan H;Xiang P;Zhang J;Tian X;Zhang K;He W;Guo Z;Diao J

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线粒体-溶酶体相互作用对于维持细胞内稳态是必不可少的。虽然已经开发了各种荧光探针来可视化这种相互作用,但它们仍然无法同时标记线粒体和溶酶体并动态跟踪它们的相互作用。在这里,我们介绍了一种细胞渗透性,生物相容性,粘度响应,小的有机分子探针,Coupa,监测线粒体和溶酶体在活细胞中的相互作用。通过功能性荧光转换,Coupa可以同时用蓝色荧光标记线粒体和用红色荧光标记溶酶体,红-蓝色荧光强度之间的相关性表明线粒体-溶酶体相互作用在线粒体自噬过程中的进展。此外,由于其荧光对粘度敏感,Coupa使我们能够精确定位线粒体-溶酶体接触的位点,并揭示与线粒体-溶酶体接触相关的线粒体局部粘度增加。因此,我们的探针是一个有吸引力的工具,在活细胞中的功能性溶酶体相互作用的本地化和动态跟踪。动态标记和跟踪细胞器-细胞器接触对于理解这些相互作用的形成和功能至关重要。在这里,作者提出了一种小分子探针Coupa,分别用蓝色和红色荧光标记线粒体和溶酶体。
Mitochondria–lysosome interactions are essential for maintaining intracellular homeostasis. Although various fluorescent probes have been developed to visualize such interactions, they remain unable to label mitochondria and lysosomes simultaneously and dynamically track their interaction. Here, we introduce a cell-permeable, biocompatible, viscosity-responsive, small organic molecular probe, Coupa, to monitor the interaction of mitochondria and lysosomes in living cells. Through a functional fluorescence conversion, Coupa can simultaneously label mitochondria with blue fluorescence and lysosomes with red fluorescence, and the correlation between the red–blue fluorescence intensity indicates the progress of mitochondria–lysosome interplay during mitophagy. Moreover, because its fluorescence is sensitive to viscosity, Coupa allowed us to precisely localize sites of mitochondria–lysosome contact and reveal increases in local viscosity on mitochondria associated with mitochondria–lysosome contact. Thus, our probe represents an attractive tool for the localization and dynamic tracking of functional mitochondria–lysosome interactions in living cells. Dynamic labeling and tracking of organelle–organelle contacts is essential to understand the formation and function of these interactions. Here the authors present a small molecule probe, Coupa, that labels mitochondria and lysosomes with blue and red fluorescence, respectively.
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