title: 2-Acetylpyridine thiosemicarbazones: cytotoxic activity in nanomolar doses against malignant gliomas.
abstract: 2-acetylpyridine N(4)-phenyl thiosemicarbazone (H2Ac4Ph), and its N(4)-ortho-tolyl (H2Ac4oT), N(4)-meta-tolyl (H2Ac4mT), N(4)-para-tolyl (H2Ac4pT), N(4)-ortho-chlorophenyl (H2Ac4oClPh), N(4)-meta-chlorophenyl (H2Ac4mClPh) and N(4)-para-chlorophenyl (H2Ac4pClPh) derivatives were assayed for their cytotoxicity against RT2 (expressing p53 protein) and against T98 (expressing mutant p53 protein) glioma cells. The compounds were highly cytotoxic against RT2 (IC50=24-1.4 nM) and T98 cells (IC50=50-1.0 nM). IC50 for cisplatin=5 (RT2) and 17 μM (T98). The thiosemicarbazones presented haemolytic activity with IC50>10(-3)M, indicating a very good therapeutic index. SAR studies suggested that stereo properties are critical to define the potential activity of the studied compounds against the RT2 cell line, while electronic properties seem to be important for interaction with the biological target in T98 cells.
authors.affiliation: Departamento de Química, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, MG, Brazil.
authors.forename: Josane A
authors.initials: JA
authors.lastname: Lessa
authors.forename: Isolda C
authors.initials: IC
authors.lastname: Mendes
authors.forename: Paulo R O
authors.initials: PR
authors.lastname: da Silva
authors.forename: Marcella A
authors.initials: MA
authors.lastname: Soares
authors.forename: Raquel G
authors.initials: RG
authors.lastname: dos Santos
authors.forename: Nivaldo L
authors.initials: NL
authors.lastname: Speziali
authors.forename: Nelilma C
authors.initials: NC
authors.lastname: Romeiro
authors.forename: Eliezer J
authors.initials: EJ
authors.lastname: Barreiro
authors.forename: Heloisa
authors.initials: H
authors.lastname: Beraldo
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects*; D018360:Crystallography, X-Ray; D004305:Dose-Response Relationship, Drug; D005910:Glioma / Q000188:drug therapy* / Q000473:pathology; D008958:Models, Molecular; D015394:Molecular Structure; D051381:Rats; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D013882:Thiosemicarbazones / Q000737:chemistry / Q000494:pharmacology*; D014407:Tumor Cells, Cultured
chemical_list: D013882:Thiosemicarbazones; C033836:2-acetylpyridine thiosemicarbazone