Influence of cadmium ions on endothelin-1 binding and calcium signaling in rat glioma C6 cells.

Cadmium ions did not influence the binding of endothelin-1 (ET-1) to its receptor on the surface of rat glioma C6 and rat aorta A10 cells. This was studied (a) by the binding of 1251-ET-1 to intact cells in the absence or presence of cadmium (Cd2+) and (b) by analysis of the receptor/ET-1 complex after crosslinking with disuccinimidyl suberate (DSS) or ethylene glycol-bis-(succinimidyl succinate) (EGS) on SDS PAGE. Using Fura-2 and Quin-2 loaded C6 rat glioma cells, it was shown that Cd2+ ions strongly interfered with the ET-1 induced Ca(2+)-influx in C6 glioma cells (IC50 approximately 10 microM).