Switching of membrane organelles between cytoskeletal transport systems is determined by regulation of the microtubule-based transport.
J Cell Biol
; 179(4): 635-41, 2007 Nov 19.
Article
em En
| MEDLINE
| ID: mdl-17998399
ABSTRACT
Intracellular transport of membrane organelles occurs along microtubules (MTs) and actin filaments (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 defining factor whose regulation determines the choice of the cytoskeletal tracks during the transport of membrane organelles.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Citoesqueleto
/
Citoesqueleto de Actina
/
Organelas
/
Microtúbulos
Idioma:
En
Ano de publicação:
2007
Tipo de documento:
Article