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Facilitation of presynaptic calcium currents in the rat brainstem

J. G. G. Borst and B. Sakmann

To study use-dependent changes in the presynaptic Ca²⁺ influx and their contribution to transmitter release, we made simultaneous voltage clamp recordings from presynaptic terminals (the calyces of Held) and postsynaptic cells (the principal cells of the medial nucleus of the trapezoid body) in slices of the rat auditory brainstem.

Following a short (2 ms) prepulse to 0 mV, calcium channels opened faster during steps to negative test potentials. During trains of action potential waveforms the Ca²⁺ influx per action potential increased. At the same time, however, the amplitude of the EPSCs decreased.

The facilitation of the calcium currents appeared to depend on a build-up of intracellular Ca²⁺, since its magnitude was proportional to the Ca²⁺ influx and it was reduced in the presence of 10 mM BAPTA.

Facilitation of the presynaptic calcium currents may contribute to short-term facilitation of transmitter release, observed when quantal output is low. Alternatively, it may counteract processes that contribute to synaptic depression.

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