title: Effect of hyperthermia in combination with vitamin E and cyclic AMP on neuroblastoma cells in culture.
abstract: The effect of heat in combination with DL-alpha-tocopheryl (vitamin E) succinate and adenosine 3', 5'-cyclic monophosphate (cAMP) stimulating agents on mouse neuroblastoma cells ( NBP2 ) in culture on the criterion of growth inhibition (due to cell death and inhibition of cell division) was studied. Heat (41 degrees-40 degrees) alone inhibited growth; however, the extent of growth inhibition was dependent upon the temperature and the time of heat treatment. Heat (41 degrees-40 degrees) in combination with vitamin E succinate (5 micrograms/ml) produced an additive effect on the criterion of growth inhibition. Vitamin C (100 micrograms/ml) failed to modify the effect of heat. Prostaglandin A2, a stimulator of adenylate cyclase, and 4 - (3-butoxy-4-methoxybenzyl)-2-imidazolidinone ( R020 -1724), an inhibitor of cyclic nucleotide phosphodiesterase, are known to induce irreversible differentiation in mouse neuroblastoma cells in culture. These agents, in combination with heat (40 degrees) produced a synergistic effect on the criterion of growth inhibition. These data suggest that the addition of vitamin E and cAMP stimulating agents may increase the effectiveness of hyperthermia protocol.
mesh_terms: D012368:4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinone / Q000494:pharmacology*; D000818:Animals; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D000242:Cyclic AMP / Q000378:metabolism*; D006358:Hot Temperature; D007093:Imidazoles / Q000494:pharmacology*; D007700:Kinetics; D051379:Mice; D009447:Neuroblastoma / Q000503:physiopathology*; D011454:Prostaglandins A / Q000494:pharmacology*; D024505:Tocopherols; D014810:Vitamin E / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D007093:Imidazoles; D011454:Prostaglandins A; D014810:Vitamin E; D012368:4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinone; D000242:Cyclic AMP; C100008:prostaglandin A2; D024505:Tocopherols