Dynamics and spatial organization of endosomes in mammalian cells.
We combine particle tracking and stochastic simulations to analyze the dynamics and organization of early endocytic vesicles in mammalian cells. At short time scales (<10(1) sec) vesicles exhibit 1D symmetric bidirectional motor-driven transport on microtubules such that the mean squared displacement (MSD) scales as t3/2, but the MSD shows a crossover to facilitated diffusion at longer times (>10(1) sec). Facilitated diffusion results in rapid equilibration of vesicles on microtubules. The asterlike organization of microtubules causes perinuclear accumulation of vesicles despite symmetric transport.
Pangarkar
Chinmay
C
Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, California 93106, USA.
Dinh
Anh Tuan
AT
Mitragotri
Samir
S
D002478:Cells, Cultured; D003198:Computer Simulation; D004705:Endocytosis / Q000502:physiology*; D011992:Endosomes / Q000000981:diagnostic imaging* / Q000502:physiology*; D005347:Fibroblasts / Q000166:cytology / Q000502:physiology; D006801:Humans; D007700:Kinetics; D008954:Models, Biological; D009068:Movement / Q000502:physiology*; D014463:Ultrasonography