The existence of large-conductance Ca(2+)-activated K(+) (BK) channels in substantia nigra pars compacta (SNc) has been a matter of debate. Using the patch-clamp technique in the inside-out configuration, we have recorded BK channel currents in SNc dopaminergic neurons. The channel has a conductance of 301 pS with a slight inward rectification and is both voltage- and calcium-dependent. Paxilline, a specific BK channel blocker, can completely block the channel, while tetraethylammonium (TEA), a nonspecific blocker of voltage-gated potassium channels, reduces its conductance and a high concentration of TEA (30 mM) inhibits its activity. ATP and GTP reduce the channel activity, while ADP is less potent, and AMP has no effect. The channel is also sensitive to changes in intracellular pH. Our results indicate that functional BK channels are expressed in SNc and suggest the possibility that the BK channel may be involved in the response of SNc dopaminergic neurons to metabolic stress.
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