...+ and Na + , both of which were suppressed after depleting the intracellular Ca 2+ stores with cyclopiazonic acid (20 μmol l –1). Uncaging inositol-trisphosphate evoked a transient rise in cytosolic Ca 2+ and Na + but no change in membrane potential. Injection of the fast Ca 2+ chelator BAPTA or depletion...

... with leucokinin, does not affect the potential profile across the principal cells, showing that chloride must pass through another route. The cell-permeant Ca 2+ chelator BAPTA-AM was shown to suppress the action of leucokinins (insect peptides that induce rapid fluid secretion), but not those of cyclic AMP...