Abstract
The kinetics and pharmacology of voltage-dependent calcium (Ca) currents in primary cultures of hippocampal neurons were studied using the whole cell clamp technique. The low voltage-activated (LVA) Ca current was activated at −50 mV and completely inactivated within 100 ms. This current was insensitive to ω-conotoxin (ω-CgTx) and to the calcium agonist Bay K 8644. The high-voltage-activated (HVA) Ca current was activated at −20 mV and inactivated incompletely during pulses of 200 ms duration. The snail toxin ω-CgTx revealed two pharmacological components of the HVA Ca current, one irreversibly blocked and the other insensitive to the toxin. Bay K 8644 had a clear agonistic action mainly on the ω-CgTx insensitive component of the HVA Ca current.
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