Pertussis toxin stimulates both basal and nicotine-evoked catecholamine secretion from intact bovine adrenal chromaffin cells, as well as Ca2+-evoked release from permeabilized cells. Tetanus toxin inhibits all these effects; it reduces the secretion of intact cells treated with pertussis toxin to the basal level, and decreases by about 50% Ca2+-evoked release from permeabilized cells whether or not previously stimulated by pertussis toxin.
