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Syncollin is required for efficient zymogen granule exocytosis
Barbara Wäsle1, Matthew Turvey, Olga Larina
1Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge CB2 1PD, UK.
The Biochemical Journal
|October 7, 2004
Summary
Syncollin protein is crucial for efficient pancreatic exocytosis. Knockout mice lacking syncollin exhibit impaired amylase release and delayed protein delivery, highlighting its role in pancreatic secretion.
Area of Science:
- Cell Biology
- Gastroenterology
- Molecular Biology
Background:
- Syncollin is a protein found in the exocrine pancreas, primarily attached to the zymogen granule membrane.
- Its precise physiological function in pancreatic secretion has not been fully elucidated.
Purpose of the Study:
- To investigate the physiological role of syncollin in pancreatic exocrine secretion.
- To determine the impact of syncollin deficiency on amylase release and exocytosis.
Main Methods:
- Generation and analysis of syncollin knockout (KO) mice.
- Measurement of pancreatic amylase levels and secretagogue-stimulated amylase release.
- Two-photon imaging to assess exocytotic events in pancreatic acini.
Main Results:
- Syncollin KO mice displayed pancreatic hypertrophy and elevated pancreatic amylase levels.
- A significant reduction (approx. 45%) in secretagogue-stimulated amylase release was observed in syncollin KO mice.
- Two-photon imaging revealed a 50% decrease in exocytotic events, particularly secondary fusion events, in syncollin KO acini.
- Delayed delivery of newly synthesized protein to zymogen granules indicated a pancreatic secretory defect.
Conclusions:
- Syncollin is essential for efficient exocytosis in pancreatic acinar cells.
- Syncollin plays a critical role in mediating compound exocytosis, involving sequential fusion events.