title: Mechanism of palytoxin-induced [3H]norepinephrine release from a rat pheochromocytoma cell line.
abstract: Palytoxin, isolated from the zoanthid Palytoha species, is one of the most potent marine toxins. Palytoxin (1 nM-1 microM) caused a release of [3H]norepinephrine from clonal rat pheochromocytoma cells in a concentration-dependent manner. This releasing action of palytoxin was markedly inhibited or abolished by Co2+ or Ca2+ -free medium, but was not modified by tetrodotoxin. The release of [3H]norepinephrine induced by a low concentration (30 nM) of palytoxin was abolished in sodium-free medium and increased as the external Na+ concentrations were increased from 3 to 100 nM, but the release induced by a high concentration (1 microM) was unaffected by varying the concentration of external Na+ from 0 to 100 mM. The release of [3H]norepinephrine induced by both concentrations of palytoxin increased with increasing Ca2+ concentrations from 0 to 3 mM. Palytoxin caused a concentration-dependent increase in 22Na and 45Ca influxes into pheochromocytoma cells at concentrations of 0.1 nM-10 nM and 1 nM-1 microM, respectively. The palytoxin-induced 45Ca influx was markedly inhibited by Co2+, whereas the palytoxin-induced 22Na influx was not affected by tetrodotoxin. These results suggest that in pheochromocytoma cells the [3H]norepinephrine release induced by lower concentrations of palytoxin is primarily brought about by increasing tetrodotoxin-insensitive Na+ permeability across the cell membrane, whereas that induced by higher concentrations is mainly caused by a direct increase in Ca2+ influx into them.
mesh_terms: D000178:Acrylamides; D000310:Adrenal Gland Neoplasms / Q000378:metabolism*; D000818:Animals; D002118:Calcium / Q000378:metabolism / Q000494:pharmacology; D002460:Cell Line; D003064:Cnidarian Venoms / Q000494:pharmacology*; D007700:Kinetics; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D009638:Norepinephrine / Q000378:metabolism*; D010673:Pheochromocytoma / Q000378:metabolism*; D051381:Rats; D012964:Sodium / Q000378:metabolism; D014316:Tritium; D000095702:Polyether Toxins
chemical_list: D000178:Acrylamides; D002118:Calcium; D003064:Cnidarian Venoms; D007770:L-Lactate Dehydrogenase; D009638:Norepinephrine; D012964:Sodium; D014316:Tritium; C010272:palytoxin; D000095702:Polyether Toxins