Abstract:
:Glucose-stimulated mobilization of large dense-core vesicles (LDCVs) to the plasma membrane is essential for sustained insulin secretion. At present, the cytoskeletal structures and molecular motors involved in vesicle trafficking in beta-cells are poorly defined. Here, we describe simultaneous imaging of enhanced green fluorescent protein (EGFP)-tagged LDCVs and microtubules in beta-cells. Microtubules exist as a tangled array, along which vesicles describe complex directional movements. Whilst LDCVs frequently changed direction, implying the involvement of both plus- and minus-end directed motors, inactivation of the minus-end motor, cytoplasmic dynein, inhibited only a small fraction of all vesicle movements which were involved in vesicle recovery after glucose-stimulated exocytosis. By contrast, selective silencing of the plus-end motor, kinesin I, with small interfering RNAs substantially inhibited all vesicle movements. We conclude that the majority of LDCV transport in beta-cells is mediated by kinesin I, whilst dynein probably contributes to the recovery of vesicles after rapid kiss-and-run exocytosis.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Varadi A,Tsuboi T,Johnson-Cadwell LI,Allan VJ,Rutter GAdoi
10.1016/j.bbrc.2003.09.208subject
Has Abstractpub_date
2003-11-14 00:00:00pages
272-82issue
2eissn
0006-291Xissn
1090-2104pii
S0006291X03020473journal_volume
311pub_type
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