Opposing roles for SNAP23 in secretion in exocrine and endocrine pancreatic cells

• Published in: The Journal of cell biology Vol. 215; no. 1; pp. 121 - 138
• Main Authors: Kunii, Masataka, Ohara-Imaizumi, Mica, Takahashi, Noriko, Kobayashi, Masaki, Kawakami, Ryosuke, Kondoh, Yasumitsu, Shimizu, Takeshi, Simizu, Siro, Lin, Bangzhong, Nunomura, Kazuto, Aoyagi, Kyota, Ohno, Mitsuyo, Ohmuraya, Masaki, Sato, Takashi, Yoshimura, Shin-Ichiro, Sato, Ken, Harada, Reiko, Kim, Yoon-Jeong, Osada, Hiroyuki, Nemoto, Tomomi, Kasai, Haruo, Kitamura, Tadahiro, Nagamatsu, Shinya, Harada, Akihiro
• Format: Journal Article
• Language: English
• Published: United States Rockefeller University Press 10.10.2016; The Rockefeller University Press
• Subjects: Acinar Cells - metabolism; Acinar Cells - ultrastructure; Amylases - metabolism; Animals; Cell Fusion; Cells; Cellular biology; Enzymes; Exocytosis; Glucose Transporter Type 4 - metabolism; Insulin - metabolism; Insulin Secretion; Islets of Langerhans - cytology; Membranes; Mice, Knockout; Microscopy, Fluorescence, Multiphoton; Models, Biological; Molecular weight; Pancreas, Exocrine - cytology; Parotid Gland - cytology; Protein Transport; Proteins; Qb-SNARE Proteins - deficiency; Qb-SNARE Proteins - metabolism; Qc-SNARE Proteins - deficiency; Qc-SNARE Proteins - metabolism; Secretory Vesicles - metabolism; SNARE Proteins - metabolism; Synaptosomal-Associated Protein 25 - metabolism
• ISSN: 0021-9525; 1540-8140
• DOI: 10.1083/jcb.201604030

The membrane fusion of secretory granules with plasma membranes is crucial for the exocytosis of hormones and enzymes. Secretion disorders can cause various diseases such as diabetes or pancreatitis. Synaptosomal-associated protein 23 (SNAP23), a soluble N-ethyl-maleimide sensitive fusion protein attachment protein receptor (SNARE) molecule, is essential for secretory granule fusion in several cell lines. However, the in vivo functions of SNAP23 in endocrine and exocrine tissues remain unclear. In this study, we show opposing roles for SNAP23 in secretion in pancreatic exocrine and endocrine cells. The loss of SNAP23 in the exocrine and endocrine pancreas resulted in decreased and increased fusion of granules to the plasma membrane after stimulation, respectively. Furthermore, we identified a low molecular weight compound, MF286, that binds specifically to SNAP23 and promotes insulin secretion in mice. Our results demonstrate opposing roles for SNAP23 in the secretion mechanisms of the endocrine and exocrine pancreas and reveal that the SNAP23-binding compound MF286 may be a promising drug for diabetes treatment.