title: Toxicity of chloroprocaine and sodium bisulfite on human neuroblastoma cells.
abstract: The effects of commercial and crystalline solutions of chloroprocaine (CP) (1.6 X 10(-3)-0.4 X 10(-3)M) and sodium bisulfite (SB) (0.8 X 10(-3)-0.08 X 10(-3)M) were studied on the multiplication of human neuroblastoma cells. These cells were chosen because of putative neurotoxicity associated with CP; cell multiplication (measured as colony-forming ability-CFA) was studied because CFA is a reliable in vitro test for drug toxicity at the cellular level. CFA was dramatically reduced (86%) after 20-hr exposure to commercial solutions of CP. Shorter exposure times (3 hr) resulted in a marginal toxic effect (32%). At similar concentrations and after 20-hr exposure time, CP crystalline solutions induced a 37.5% inhibition that decreased with decreased time in culture. Sodium bisulfite reduced cell multiplication to a degree that varied with different samples of SB. With a 3-hr exposure time, CFA was reduced 72-92% by SB-1 and 57-72% by SB-2. The variability of SB toxicity and the difference in toxicity with commercial and crystalline solutions of CP are discussed in terms of possible clinical toxicity.
mesh_terms: D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D003114:Colony-Forming Units Assay; D006801:Humans; D066298:In Vitro Techniques; D009447:Neuroblastoma / Q000473:pathology*; D011343:Procaine / Q000031:analogs & derivatives* / Q000633:toxicity; D013447:Sulfites / Q000633:toxicity*
chemical_list: D013447:Sulfites; D011343:Procaine; C004616:chloroprocaine; C009279:sodium bisulfite