Objective To investigate the underlying mechanism for the selective modulation of the permeability of blood-tumor barrier(BTB) by small dose of bradykinin(BK). Methods C6 glioma cells were treated with BK,and changes of intracellular nitric oxide(NO) and intracellular calcium level were measured with fluorescent spectrophotometer. Results The initial application of BK easily triggered extracellular calcium influx,which resulted in intracellular calcium store release in C6 glioma cells. The above mechanism w...