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Single-Janus Rod Tracking Reveals the “Rock-and-Roll” of Endosomes in Living Cells

Journal Article · · Langmuir
Endosomes in cells are known to move directionally along microtubules, but their rotational dynamics have rarely been investigated. Even less is known, specifically, about the rotation of nonspherical endosomes. Here we report a single-Janus rod rotational tracking study to reveal the rich rotational dynamics of rod-shaped endosomes in living cells. The rotational reporters were Janus rods that display patches of different fluorescent colors on opposite sides along their long axes. When the Janus rods are wrapped tightly inside endosomes, their shape and optical anisotropy allow the simultaneous measurements of all three rotational angles (in-plane, out-of-plane, and longitudinal) and the translational motion of single endosomes with high spatiotemporal resolutions. We demonstrate that endosomes undergo in-plane rotation and rolling during intracellular transport and that such rotational dynamics are driven by rapid microtubule fluctuations. We reveal for the first time the “rock-and-roll” of endosomes in living cells and how the intracellular environment modifies such rotational dynamics. As a result, this study demonstrates a unique application of Janus particles as imaging probes in the elucidation of fundamental biological questions.
Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1466758
Report Number(s):
SAND--2018-8864J; 667025
Journal Information:
Langmuir, Journal Name: Langmuir Journal Issue: 3 Vol. 34; ISSN 0743-7463
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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3D rotational motion of an endocytic vesicle on a complex microtubule network in a living cell journal January 2019

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