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Components of action potential repolarization in cerebellar parallel fibres

The presynaptic action potential waveform was investigated in cerebellar parallel fibres from rats. The spike repolarization was composed of a fast tetraethylammonium‐sensitive component and a slow margatoxin‐sensitive depolarized after‐potential (DAP). These components could be manipulated relatively independently, possibly offering independent control of synchronous and asynchronous transmitter release. Axonal electrical activation sometimes gave bursts of action potentials at the soma; these bursts were created by the axon because they invaded the soma at membrane potentials well below the somatic spike threshold. Axonal bursts could reliably be induced by increasing the DAP pharmacologically, suggesting that proper control of DAP amplitude is necessary to suppress axonal bursting. The fast repolarization was particularly well controlled because blockers of three groups of K+ channels (tetraethylammonium, margatoxin and quinine) were needed to abolish it.