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© The Rockefeller University Press, 0022-1295/1998//225/ $5.00
Journal of General Physiology, Volume 111, Number 2, 1998

Article

Adenosine Triphosphate and the Late Steps in Calcium-dependent Exocytosis at a Ribbon Synapse

Ruth Heidelberger

From the Department of Membrane Biophysics, Max-Planck-Institute for Biophysical Chemistry, 37077 Göttingen, Germany

The ATP dependence of the kinetics of Ca2+-dependent exocytosis after flash photolysis of caged Ca2+ was studied by capacitance measurements with submillisecond resolution in single synaptic terminals of retinal bipolar neurons. After control experiments verified that this combination of techniques is valid for the study of exocytosis in synaptic terminals, a comparison was made between the Ca2+ dependence of the rate of exocytosis in synaptic terminals internally dialyzed with MgATP, MgATP-{gamma}-S, or no added Mg2+ or nucleotide. The Ca2+ threshold for release, the maximum rate of release, and the overall relationship between the rate of synaptic vesicle fusion and [Ca2+]i were found to be independent of MgATP. A decrease in the average rate at near-threshold [Ca2+]i was observed in terminals with MgATP-{gamma}-S, but due to the small sample size is of unclear significance. The Ca2+ dependence of the delay between the elevation of [Ca2+]i and the beginning of the capacitance rise was also found to be independent of MgATP. In contrast, MgATP had a marked effect on the ability of terminals to respond to multiple stimuli. Terminals with MgATP typically exhibited a capacitance increase to a second stimulus that was >70% of the amplitude of the first response and to a third stimulus with a response amplitude that was >50% of the first, whereas terminals without MgATP responded to a second stimulus with a response <35% of the first and rarely responded to a third flash. These results suggest a major role for MgATP in preparing synaptic vesicles for fusion, but indicate that cytosolic MgATP may have little role in events downstream of calcium entry, provided that [Ca2+]i near release sites is elevated above {approx}30 µM.

Key Words: exocytosis • membrane fusion • priming • MgATP • synaptic vesicle

Address correspondence to Dr. Ruth Heidelberger, Dept. of Neurobiology and Anatomy, University of Texas at Houston Health Science Center, 6431 Fannin Street, Houston, TX 77030. Fax: 713-500-0621; E-mail: rheidel{at}nba19.med.uth.tmc.edu


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