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Patch-clamp experiments in the whole-cell mode have been performed in Swiss 3T3 mouse fibroblasts. Depolarizations from negative holding potential (Vh less than -60 mV) gave rise to a rapidly activating, fully inactivating, inward current of few tenths of nA in physiological saline at 35 degrees C. The current persisted when external Na+ was replaced by impermeant TMA+ and disappeared in 0 Ca2+, 1 mM EGTA. The current was reversible blocked by Co2+ and it was slightly reduced when external Ca2+ was substituted by Ba2+. Finally its reversal potential changed with Nernstian slope with increasing external Ca2+ concentrations. It is concluded that these cells possess a voltage-dependent Ca2+ channel.
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