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Journal of Cell Science, Vol 114, Issue 9 1709-1716, Copyright © 2001 by Company of Biologists
JOURNAL ARTICLES |
A Gut, CE Kiraly, M Fukuda, K Mikoshiba, CB Wollheim and J Lang
Division de Biochimie Clinique, Departement de Medecine, Universite de Geneve, CH-1211 Geneve 4, Switzerland. j.lang@iecb-polytechnique.u-bordeaux.fr
Exocytosis of insulin containing Large Dense Core Vesicles (LDCVs) from pancreatic (&bgr;)-cells and derived cell lines is mainly controlled by Ca(2+). Several lines of evidence have demonstrated a role of the Ca(2+)- and phospholipid-binding protein synaptotagmin (syt) in this event. Synaptotagmins form a large protein family with distinct affinities for Ca(2+) determined by their two C(2) domains (C(2)A/B). Except for the well-characterized isoforms I and II, their role is still unclear. We have used here insulin-secreting cells as a model system for LDCV exocytosis to gain insight into the function of synaptotagmins. Immunocytochemical analysis revealed that of the candidate Ca(2+) sensors in LDCV exocytosis, syt III was not expressed in primary (&bgr;)-cells, whereas syt IV was only found adjacent to the TGN. However, syt V-VIII isoforms were expressed at different levels in various insulin-secreting cells and in pancreatic islet preparations. In streptolysin-O permeabilized primary (&bgr;)-cells the introduction of recombinant peptides (100 nM) corresponding to the C(2) domains of syt V, VII and VIII, but not of syt III, IV or VI, inhibited Ca(2+)-evoked insulin exocytosis by 30% without altering GTP*S-induced release. Our observations demonstrate that syt III and IV are not involved in the exocytosis of LDCVs from primary (&bgr;)-cells whereas V, VII and VIII may mediate Ca(2+)-regulation of exocytosis.
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