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Updated: Aug 15, 2026

Methods for Cell-attached Capacitance Measurements in Mouse Adrenal Chromaffin Cell
Published on: October 22, 2014
Kinetics of exocytosis in adrenal chromaffin cells
1Department of Membrane Biophysics, Max-Planck Institute for Biophysical Chemistry, Am Fassberg, D-37077 Göttingen, Germany.
Abstract:
Upon repetitive or maintained stimulation, chromaffin cells secrete catecholamines initially at a very high rate which then relaxes with multiple kinetic components. The complex kinetics are often modeled as resulting from the successive depletion of several functional pools of secretory granules which may reflect specific protein-mediated steps in granule maturation. The fastest component represents granules fully primed for exocytosis. This 'readily releasable pool' may, under some circumstances, consist of only about a dozen granules which can be released within tens of milliseconds. Modulating the size of this pool may be an important way for cells to regulate secretion.
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