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The Journal of Neuroscience, January 15, 1999, 19(2):589-598
A Persistent Activity-Dependent Facilitation in Chromaffin Cells Is Caused by Ca2+ Activation of Protein Kinase C
Corey Smith Department of Membrane Biophysics, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany
Activity-dependent facilitation was studied in bovine adrenal chromaffin cells. Stimulation with a train of depolarizations caused subsequent triggered exocytotic activity to be significantly enhanced. After the facilitating stimulus train, the readily releasable vesicle pool (RRP) size was estimated from capacitance jumps in response to paired depolarizations and found to be elevated for a period of at least 10 min. The time dependency of onset and degree of facilitation could be well fitted assuming protein kinase C (PKC)-dependent and independent Ca2+-mediated processes. Both processes increase the recruitment of vesicles from the reserve pool to the RRP, resulting in an greater number of releasable vesicles. The data suggest that cell activity can act as a trigger to increase cytosolic Ca2+ to a level sufficient to cause an increase in the number of readily releasable secretory vesicles, with the more persistent component of the evoked facilitation being mediated through activity-dependent activation of PKC.
Key words: facilitation; exocytosis; vesicle pools; plasticity; membrane capacitance; chromaffin
Copyright © 1999 Society for Neuroscience 0270-6474/99/192589-10$05.00/0
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