title: Activity of 2-acetylpyridine thiosemicarbazones against Trypanosoma rhodesiense in vitro.
abstract: Twenty-seven 2-acetylpyridine thiosemicarbazones and analogs were tested for antitrypanosomal activity against Trypanosoma rhodesiense using a semiautomated in vitro assay system. Activity was determined by relative inhibition of uptake of two radiolabeled macromolecular precursors, [methyl-3H]thymidine and L-[U-14C]leucine, as compared to untreated controls. It was observed that the nitrogen atom of the pyridyl moiety of the 2-acetylpyridine thiosemicarbazones was essential for antitrypanosomal activity. The 2-acetylpyridine thiosemicarbazones generally inhibited the uptake of L-[U-14C]leucine to a greater extent than they inhibited [methyl-3H]thymidine uptake. Twenty-four of the 27 compounds tested exhibited activity comparable to that found for the antitrypanosomal agent ethidium bromide.
mesh_terms: D000818:Animals; D066298:In Vitro Techniques; D014176:Protein Biosynthesis; D011725:Pyridines / Q000494:pharmacology*; D013329:Structure-Activity Relationship; D013882:Thiosemicarbazones / Q000494:pharmacology*; D013936:Thymidine / Q000378:metabolism; D014344:Trypanocidal Agents / Q000494:pharmacology*; D014345:Trypanosoma / Q000187:drug effects* / Q000378:metabolism
chemical_list: D011725:Pyridines; D013882:Thiosemicarbazones; D014344:Trypanocidal Agents; D013936:Thymidine