Purinergic control of intercellular communication between Hensen's cells of the guinea-pig cochlea

2. The slower responses were maintained in the absence of extracellular Ca(2+). Similar responses were produced by increasing the [Ca(2+)](i) via UV flash photolysis of intracellular D-myo-inositol 1,4,5-triphosphate, P4(5)-(1 -(2-nitrophenyl)ethyl) ester (caged InsP(3)) loaded at pipette concentrations of 8-16 muM.