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research article

Multicolor Bleach-Rate Imaging Enlightens in vivo Sterol Transport

Wüstner, D.
•
Sage, D.  
2010
Communicative & Integrative Biology

Elucidation of in vivo cholesterol transport and its aberrations in cardiovascular diseases requires suitable model organisms and the development of appropriate monitoring technology. We recently presented a new approach to visualize transport of the intrinsically fluorescent sterol, dehydroergosterol (DHE) in the genetically tractable model organism Caenorhabditis elegans (C. elegans). DHE is structurally very similar to cholesterol and ergosterol, two sterols used by the sterol-auxotroph nematode. We developed a new computational method measuring fluorophore bleaching kinetics at every pixel position, which can be used as a fingerprint to distinguish rapidly bleaching DHE from slowly bleaching autofluorescence in the animals. Here, we introduce multicolor bleach-rate sterol imaging. By this method, we demonstrate that some DHE is targeted to a population of basolateral recycling endosomes (RE) labelled with GFP-tagged RME-1 (GFP-RME-1) in the intestine of both, wild-type nematodes and mutant animals lacking intestinal gut granules (glo1-mutants). DHE-enriched intestinal organelles of glo1-mutants were decorated with GFP-rme8, a marker for early endosomes. No co-localization was found with a lysosomal marker, GFP-LMP1. Our new methods hold great promise for further studies on endosomal sterol transport in C. elegans.

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Type
research article
DOI
10.4161/cib.3.4.11972
Author(s)
Wüstner, D.
Sage, D.  
Date Issued

2010

Publisher

Landes Bioscience

Published in
Communicative & Integrative Biology
Volume

3

Issue

4

Start page

370

End page

373

URL

URL

http://bigwww.epfl.ch/publications/wuestner1002.html
Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LIB  
Available on Infoscience
February 17, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/64513
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