Related Experiment Videos
Tuning exocytosis for speed: fast and slow modes
1Department of Biochemistry, University of Wisconsin, 433 Babcock Drive, Madison, WI 53706, USA. tfmartin@facstaff.wisc.edu
Biochimica Et Biophysica Acta
|August 14, 2003
Summary
Calcium-triggered exocytosis varies in speed across cell types. This review examines molecular differences in synaptic vesicle (SV) and dense-core vesicle (DCV) exocytosis to explain these speed variations.
Area of Science:
- Cell biology
- Neuroscience
- Endocrinology
Background:
- Calcium-triggered exocytosis is a fundamental process in many cell types, including neural, endocrine, and exocrine cells.
- Significant variations exist in the time it takes for fusion to occur after a calcium rise and in the overall fusion rates.
Purpose of the Study:
- To review and analyze reported differences in exocytosis speed between synaptic vesicles (SV) and dense-core vesicles (DCV).
- To identify key molecular mechanisms underlying vesicle docking, priming, and fusion that contribute to observed speed differences.
Main Methods:
- Literature review of studies comparing SV and DCV exocytosis.
- Analysis of molecular components involved in vesicle trafficking and fusion.
Main Results:
- Differences in the molecular machinery for docking, priming, and fusion between SVs and DCVs are evident.
- Specific molecular features likely dictate the distinct kinetic properties of SV and DCV exocytosis.
Conclusions:
- The molecular mechanisms governing vesicle docking, priming, and fusion are critical determinants of exocytosis speed.
- Understanding these molecular differences provides insight into the functional diversity of exocytic processes.