Optically resolving individual microtubules in live axons.

Optically resolving individual microtubules in live axons.
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DOI:
10.1016/j.str.2009.09.008
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发表时间:
2009-11-11
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Cui B
Cui B
中科院分区:
其他
文献类型:
--
作者:
Mudrakola HV;Zhang K;Cui B

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Microtubules are essential cytoskeletal tracks for cargo transportation in axons and also serve as the primary structural scaffold of neurons. Structural assembly, stability, and dynamics of axonal microtubules are of great interest for understanding neuronal functions and pathologies. However, microtubules are so densely packed in axons that their separations are well below the diffraction limit of light, which precludes using optical microscopy for live-cell studies. Here, we present a single-molecule imaging method capable of resolving individual microtubules in live axons. In our method, unlabeled microtubules are revealed by following individual axonal cargos that travel along them. We resolved more than six microtubules in a 1 μm diameter axon by real-time tracking of endosomes containing quantum dots. Our live-cell study also provided direct evidence that endosomes switch between microtubules while traveling along axons, which has been proposed to be the primary means for axonal cargos to effectively navigate through the crowded axoplasmic environment.
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