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Previous Article | Next Article
The Journal of Neuroscience, May 15, 1998, 18(10):3548-3553
Extrasynaptic Vesicular Transmitter Release from the Somata of Substantia Nigra Neurons in Rat Midbrain Slices
Erica H. Jaffe1, 2, Alain Marty2, Albert Schulte1, and Robert H. Chow3 1 Division of Molecular Biology of Neuronal Signaling, Max-Planck-Institut für Experimentelle Medizin, Göttingen, Germany D-37075, 2 Arbeitsgruppe Zelluläre Neurobiologie, Max-Planck-Institut für Biophysikalische Chemie, Göttingen, Germany D-37077, and 3 Membrane Biology Group and Department of Physiology, University of Edinburgh Medical School, Edinburgh, United Kingdom EH8 9AG
Substantia nigra neurons release dopamine from their somatodendritic regions. A long-unresolved question is whether this release occurs by exocytosis or by a nonvesicular mechanism. We used carbon fiber microelectrodes in a brainstem slice to assay secretion from single cell bodies that had been cleared of connective tissue. Amperometry at the carbon fiber microelectrodes revealed unitary events in ~90% of cells in resting conditions. These events had charge integrals ranging from a few femtocoulombs to several hundred femtocoulombs (fC). Local glutamate application enhanced the event frequency by 3.5-fold on average and up to 10-fold in highly responsive cells, although the mean charge integral was not modified. Local application of a high K+-containing saline had effects similar to those of glutamate. The frequency of resting and stimulated amperometric events was much lower at 21-22°C than at 32-35°C. The addition of Cd2+ (50 µM), a blocker of voltage-dependent Ca2+ channels, to the bath solution blocked the stimulatory effects of glutamate. These results suggest that dopamine is released from the somata of substantia nigra neurons by exocytosis and that this mechanism is regulated by neuronal electrical activity. More generally, this study demonstrates the applicability of carbon fiber microelectrodes to the measurement of quantal monoamine secretion in brain slices.
Key words: substantia nigra; carbon fiber; exocytosis; dopamine; amperometry, pars compacta
Copyright © 1998 Society for Neuroscience 0270-6474/98/18103548-06$05.00/0
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