Mechanisms of dense core vesicle recapture following "kiss and run" ("cavicapture") exocytosis in insulin-secreting cells

The Journal of Biological Chemistry
Takashi TsuboiGuy A Rutter

Abstract

The molecular mechanisms underlying "kiss and run" or "cavicapture" exocytosis of dense core secretory vesicles are presently unclear. Although dynamin-1 has previously been implicated in the recapture process in neurons, the recruitment of this fission protein to a single exocytosing vesicle has not been examined in real time during peptide release from pancreatic beta-cells. Imaged simultaneously in clonal insulin-secreting cells by dual color total internal reflection fluorescence microscopy, monomeric red fluorescent protein (mRFP)-tagged neuropeptide Y and green fluorescent protein (GFP)-tagged synaptotagmin-1 or synaptobrevin-2 rapidly diffused from sites of exocytosis, whereas the vesicle membrane protein phogrin and tissue plasminogen activator (tPA) were retained, consistent with fusion pore closure. Vesicle recovery frequently involved the recruitment of enhanced GFP-tagged dynamin-1, and GTPase-defective dynamin-1(K44E) increased the dwell time of tPA-mRFP at the plasma membrane. By contrast, recruitment of GFP chimeras of clathrin, epsin, and amphiphysin was not observed. Expression of dynamin-1(K535A), mutated in the pleckstrin homology domain, caused the apparent full fusion of vesicles, as reported by the additio...Continue Reading

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