Fig. 4

TEA or quinidine alone did not significantly affect CPA-triggered Ca²⁺ influx in astrocytes. Astrocytes were bathed in Ca²⁺-free solution in the absence or presence of a Kv channel blocker (20 mM TEA or 30 μM quinidine); they were then exposed to 50 μM CPA followed by replenishment of 2 mM CaCl₂. Quantification of the Ca²⁺ release component (a) and the Ca²⁺ influx component (b) in the absence or presence of 20 mM TEA. Quantification of the Ca²⁺ release component (c) and the Ca²⁺ influx component (d) in the absence or presence of 30 μM quinidine. Results are mean ± SEM of 23–36 cells from 4 separate experiments