title: Synthesis, cytotoxicity and effects of some 1,2,4-triazole and 1,3,4-thiadiazole derivatives on immunocompetent cells.
abstract: Novel derivatives of 4,5-substituted-1,2,4-triazole-thiones and 2,5-substituted-1,3,4-thiadiazoles were synthesized and evaluated for their cytotoxicity. The biological study indicated that compounds 4-ethyl-5-(4,5,6,7-tetrahydro-1-benzothien-2-yl)-2,4-dihydro-3H-1,2,4-triazole-3-thione 13, N-ethyl-5-(4,5,6,7-tetrahydro-1-benzothien-2-yl)-1,3,4-thiadiazol-2-amine 16, 4-amino-5-(4,5,6,7-tetrahydro-1-benzothien-2-yl)-2,4-dihydro-3H-1,2,4-triazole-3-thione 20 and 4-amino-5-(5-phenylthien-2-yl)-2,4-dihydro-3H-1,2,4-triazole-3-thione 21 possessed high cytotoxicity in vitro against thymocytes. The corresponding IC(50) values were 0.46 microM, 5.2 x 10(-6)microM, 0.012 microM and 1.0 x 10(-6)microM. Most toxic against lymphocytes was compound 21, IC(50) - 0.012 microM. The tested compounds showed a general stimulation effect on B-cells' response.
authors.affiliation: Department of Organic Synthesis, University of Chemical Technology and Metallurgy, 8 Kliment Ohridski Boulevard, 1756 Sofia, Bulgaria. anmav@abv.bg
authors.forename: Anelia Ts
authors.initials: ATs
authors.lastname: Mavrova
authors.forename: Diana
authors.initials: D
authors.lastname: Wesselinova
authors.forename: Yordan A
authors.initials: YA
authors.lastname: Tsenov
authors.forename: Pavletta
authors.initials: P
authors.lastname: Denkova
mesh_terms: D001402:B-Lymphocytes / Q000187:drug effects; D006801:Humans; D007107:Immune System / Q000166:cytology / Q000187:drug effects*; D020128:Inhibitory Concentration 50; D008214:Lymphocytes / Q000187:drug effects; D013329:Structure-Activity Relationship; D013830:Thiadiazoles / Q000138:chemical synthesis* / Q000494:pharmacology; D013961:Thyroid Gland / Q000166:cytology / Q000187:drug effects; D014230:Triazoles / Q000138:chemical synthesis* / Q000494:pharmacology
chemical_list: D013830:Thiadiazoles; D014230:Triazoles