title: Antihemolytic and antiproteolytic properties of substituted thiosemicarbazidophenothiazines and thiazolidonylphenothiazines.
abstract: Antihemolytic and antiproteolytic properties of several 10-(1-acetyl-4-arylthiosemicarbazido) phenothiazines and their corresponding cyclized 10-(2-arylimino-3-acetylamino-4-thiazolidonyl) phenothiazines were investigated. In vitro protection of hypoosmotic hemolysis of human red blood cells by substituted thiosemicarbazidophenothiazines and substituted thiazolidonyl-phenothiazines was concentration dependent; the degree of protection ranged from 19 to 32 and 26 to 42%, respectively, at a final concentration of 0.1 mM. All phenothiazines exhibited antiproteolytic activity. The in vitro inhibition of trypsin-induced hydrolysis of bovine serum albumin by these phenothiazines was concentration dependent and competitive in nature; the degree of inhibition ranged from 30 to 50 and 32 to 79% for substituted thiosemicarbazidophenothiazines and substituted thiazolidonlyphenothiazines, respectively, at a concentration of 1mM. Cyclization of substituted thiosemicarbazidophenothiazines into the corresponding cyclized substitited thiazolidonlyphenothiazines increased the antihemolytic and antiproteolytic effectiveness of these phenothiazines.
mesh_terms: D003864:Depression, Chemical; D004912:Erythrocytes / Q000187:drug effects; D006461:Hemolysis / Q000187:drug effects*; D006801:Humans; D066298:In Vitro Techniques; D010640:Phenothiazines / Q000494:pharmacology*; D012663:Semicarbazides / Q000494:pharmacology; D013844:Thiazoles / Q000494:pharmacology; D013997:Time Factors; D014361:Trypsin Inhibitors / Q000494:pharmacology*
chemical_list: D010640:Phenothiazines; D012663:Semicarbazides; D013844:Thiazoles; D014361:Trypsin Inhibitors