期刊
JOURNAL OF CELL BIOLOGY
卷 179, 期 4, 页码 635-641出版社
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.200705146
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资金
- NCRR NIH HHS [P41 RR013186, RR13186] Funding Source: Medline
- NIGMS NIH HHS [R01 GM062290, GM-62290] Funding Source: Medline
Intracellular transport of membrane organelles occurs along microtubules (MTs) and actin. laments (AFs). Although transport along each type of the cytoskeletal tracks is well characterized, the switching between the two types of transport is poorly understood because it cannot be observed directly in living cells. To gain insight into the regulation of the switching of membrane organelles between the two major transport systems, we developed a novel approach that combines live cell imaging with computational modeling. Using this approach, we measured the parameters that determine how fast membrane organelles switch back and forth between MTs and AFs (the switching rate constants) and compared these parameters during different signaling states. We show that regulation involves a major change in a single parameter: the transferring rate from AFs onto MTs. This result suggests that MT transport is the de. ning factor whose regulation determines the choice of the cytoskeletal tracks during the transport of membrane organelles.
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