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J Neurophysiol 73: 312-319, 1995;
0022-3077/95 $5.00
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Journal of Neurophysiology, Vol 73, Issue 1 312-319, Copyright © 1995 by APS

ARTICLES

Properties of ATP-gated channels recorded from rat sympathetic neurons: voltage dependence and regulation by Zn2+ ions

R. Cloues
Department of Pharmacology, University College London, United Kingdom.

1. I recorded ATP-gated channels from excised outside-out patches from rat sympathetic neurons. The channels had a unitary conductance of approximately 12 pS at -80 mV, were activated only when ATP was present in the bath, and could be blocked by the P2-purinoceptor antagonist suramin. 2. The open probability of the channels showed a strong voltage dependence, increasing significantly with hyperpolarization. This suggests that whole cell rectification of currents evoked by P2X receptor activation is a result of channel voltage dependence and not of properties of ion permeation. 3. Low concentrations of extracellular Zn2+, which has previously been shown to potentiate whole cell ATP-evoked currents, increased the open probability of ATP-gated channels without altering the unitary conductance. 4. Zn2+ increased both the opening frequency and the burst duration of ATP-gated channels. The results are consistent with Zn2+ acting as an allosteric modulator of the P2X receptor in sympathetic neurons.


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