Journal
ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS
Volume 477, Issue 1, Pages 146-154Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.abb.2008.04.039
Keywords
electrophysiology; capacitance; fusion pore; dynamin I; clathrin; chromaffin
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Funding
- NSF [IBN-0344768]
- NIH [11 R01 NS052123]
- [T32 HL 07653]
- [J32 HL 07887]
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Under low stimulation, adrenal chromaffin cells release freely soluble catecholamines through a restricted granule fusion pore while retaining the large neuropeptide-containing proteinacious granule core. Elevated activity causes dilation of the pore and release of all granule contents. Thus, physiological differential transmitter release is achieved through regulation of fusion pore dilation. We examined the mechanism for pore dilation utilizing a combined approach of peptide transfection, electrophysiology, electrochemistry and quantitative imaging techniques. We report that disruption of dynamin I function alters both fusion modes. Under low stimulation, interference with dynamin I does not affect granule fusion but blocks its re-internalization. In full collapse mode, disruption of dynamin I limits fusion pore dilation, but does not block membrane re-internalization. These data suggest that dynamin I is involved in both modes of exocytosis by regulating contraction or dilation of the fusion pore and thus contributes to activity-dependent differential transmitter release from the adrenal medulla. (c) 2008 Elsevier Inc. All rights reserved.
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