2-Acetylpyridine- and 2-benzoylpyridine-derived thiosemicarbazones and their antimony(III) complexes exhibit high anti-trypanosomal activity
摘要:
Complexes [Sb(2Ac4oClPh)Cl-2] (1), [Sb(2Ac4oFPh)Cl-2] (2), [Sb(2Ac4oNO(2)Ph)Cl-2] (3), [Sb(28z4oClPh)Cl-2] (4), [Sb(2Bz4oFPh)Cl-2] (5) and [Sb(2Bz4oNO(2)Ph)Cl-2] (6) were obtained with 2-acetylpyridine-N(4)-orthochlorophenyl thiosemicarbazone (H2Ac4oClPh) and its N(4)-ortho-fluor (H2Ac4oFPh) and N(4)-ortho-nitro (H2Ac4oNO(2)Ph) analogues, and with the corresponding 2-benzoylpyridine-derived thiosemicarbazones (H2Bz4oClPh, H2Bz4oFPh, H2Bz4oNO(2)Ph). The studied compounds are excellent inhibitors of Trypanosoma cruzi growth. H2Bz4oClPh and complexes (4) and (1) were the most trypanosomicidal.Upon coordination of H2Ac4oClPh to antimony(III) in 1, the therapeutic index (TI) goes from 10.58 to 14.35. However, the best values of TI were found for H2Bz4oClPh (TI = 1240) and H2Ac4oNO(2)Ph (TI = 773). Structure-activity relationship (SAR) studies did not allow the establishment of correlations between the anti-trypanosomal activity and physico-chemical parameters, but correlations were found between the cytotoxicities and physico-chemical properties. (C) 2011 Elsevier Ltd. All rights reserved.
Cytotoxic effects of indium(III) complexes with 2-acetylpyridine-N(4)-ortho-fluorophenylthiosemicarbazone and their radioactive 114mIn analogues against human glioma cells
作者:Andrea R. Aguirre、Gabrieli L. Parrilha、Renata Diniz、Beatriz Cancelier Ribeiro、Raquel G. Dos Santos、Heloisa Beraldo
DOI:10.1016/j.poly.2019.02.055
日期:2019.5
Complexes [ln(2Ac4oFPh)Cl-2(MeOH)] (1) and [In(2Ac4oFPh)Cl-2]center dot 0.5EtOH (2) were obtained with 2-acetylpyridine-N(4)-ortho-fluorophenyl thiosemicarbazone (H2Ac4oFPh). Neutron activation of I and 2 resulted in the formation of the In-114m/In-115m analogues (*1) and (*2). The thiosemicarbazone ligand, the non-radioactive and radioactive complexes were assayed for their cytotoxic effects against U87 human glioblastoma cells. While radioactive and non-radioactive InCl3 were devoid of cytotoxic activity, complexes (I) and (2) and their radioactive analogues (*1) and (*2) showed similar cytotoxic effects and were as active as the parent thiosemicarbazone against U87 glioma cells. Since the radioactive complexes revealed to keep the thiosemicarbazone cytotoxicity, if these complexes are produced with high specific activity, they might constitute an interesting platform for the development of prototype radiotracer drugs for treatment of glioma neoplasia by delivering high radiation dose to the tumor cells. (C) 2019 Elsevier Ltd. All rights reserved.