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Pharmacological characterisation of voltage‐sensitive calcium channels and neurotransmitter release from mouse cerebellar granule cells in culture

Using subtype‐specific Ca‐channel blockers, we have characterised the voltage‐sensitive Ca2+ currents as well as neurotransmitter release from cultured mouse cerebellar granule cells. The whole cell version of the patch clamp technique was adapted to monitor the isolated Ca‐channel currents. The currents were activated at potentials more positive than −40 mV and were composed of at least four pharmacological distinct components being sensitive to nifedipine (35%), ω‐conotoxin GVIA (10%), and ω‐agatoxin IVA (42%) corresponding to L‐, N‐, and P‐channel‐mediated currents. The insensitive fraction (13%) possibly represented R channels.