“On the other hand, … cells were incubated with imipramine in … of Ni2+ (300 microM) or La3+ (0.3 microM), inorganic Ca(2+)-channel blockers, the IC50 values of inhibition of 25 … K(+)-induced [Ca2+]i increases were much lower than with imipramine alone (3.2 and 16 microM, respectively).”