the functional significance of synaptotagmin diversity in neuroendocrine secretion
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2013
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Abstract
Synaptotagmins (syts) are abundant, evolutionarily-conserved integral membrane proteins that play essential roles in regulated exocytosis in nervous and endocrine systems. There are at least 17 syt isoforms in mammals, all with tandem C-terminal C2 domains with highly variable capacities for Ca2+ binding. Many syts play roles in neurotransmitter release or hormone secretion or both, and a growing body of work supports a role for some syts as Ca2+ sensors of exocytosis. Work in many types of endocrine cells has documented the presence of a number of syt isoforms on dense-core vesicles containing various hormones. Syts can influence the kinetics of exocytotic fusion pores and the choice of release mode between kiss-and-run and full-fusion. Vesicles harboring different syt isoforms can preferentially undergo distinct modes of exocytosis with different forms of stimulation. The diverse properties of syt isoforms enable these proteins to shape Ca2+ sensing in endocrine cells, thus contributing to the regulation of hormone release and the organization of complex endocrine functions.
| Reference Key |
moghadam2013frontiersthe
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|---|---|
| Authors | ;Paanteha K Moghadam;Meyer B Jackson |
| Journal | aip advances |
| Year | 2013 |
| DOI |
10.3389/fendo.2013.00124
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| URL | |
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