title: Production of Shiga toxin and other cytotoxins by serogroups of Shigella.
abstract: We measured the cytotoxic activity of 119 strains of Shigella by using a quantitative [3H]thymidine-labeled HeLa cell assay. We assayed 13 strains of Shigella dysenteriae 1; 18 strains of S. dysenteriae types 2 and 3; and 88 strains of Shigella sonnei, Shigella flexneri, and Shigella boydii. Strains of S. dysenteriae 1 demonstrated high levels of cytotoxicity (geometric mean, 10(5.04) CD50/mg of protein; range, 10(3.95)-10(6.10). Cytotoxic activities of the non-type 1 strains of S. dysenteriae and of the other Shigella serogroups were approximately 1/1,000 that of the S. dysenteriae 1 strains (range, 10(1.09)-10(3.11) CD50/mg of protein). Neutralization of cytotoxicity by using rabbit antiserum to purified Shiga toxin revealed that in all strains of S. dysenteriae 1, greater than or equal to 99.5% of cytotoxic activity was attributable to Shiga toxin. In contrast, 88 of the other Shigella strains produced only nonneutralizable cytotoxic activity. Six of 18 strains of non-type 1 S. dysenteriae and 12 of 88 strains from other Shigella serogroups produced both Shiga toxin and nonneutralizable toxin.
mesh_terms: D001427:Bacterial Toxins / Q000096:biosynthesis* / Q000276:immunology; D003603:Cytotoxins / Q000096:biosynthesis*; D004926:Escherichia coli / Q000472:pathogenicity; D006367:HeLa Cells; D022603:Shiga Toxins; D012760:Shigella / Q000145:classification / Q000472:pathogenicity*; D013045:Species Specificity
chemical_list: D001427:Bacterial Toxins; D003603:Cytotoxins; D022603:Shiga Toxins