Details

Autor(en) / Beteiligte

• Moreira, Felipe Figueirôa
• Portes, Juliana de Araujo
• Barros Azeredo, Nathália Florência
• Fernandes, Christiane
• Horn, Adolfo
• Santiago, Cristina Pinheiro
• Segat, Bruna Barriquel
• Caramori, Giovanni Finoto
• Madureira, Letícia Maria Pequeno
• Candela, Dalber Ruben Sanchez
• Marques, Marcelo Monteiro
• Lamounier Camargos Resende, Jackson Antônio
• de Souza, Wanderley
• DaMatta, Renato Augusto
• Seabra, Sergio Henrique

Titel

Development of new dinuclear Fe() coordination compounds with nanomolar antitrypanosomal activity

Ist Teil von

• Dalton transactions : an international journal of inorganic chemistry, 2021-09, Vol.5 (35), p.12242-12264

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Chagas disease is a neglected tropical disease caused by the protozoan pathogen Trypanosoma cruzi . The disease is a major public health problem affecting about 6 to 7 million people worldwide, mostly in Latin America. The available therapy for this disease is based on two drugs, nifurtimox and benznidazole, which exhibit severe side effects, including resistance, severe cytotoxicity, variable efficacy and inefficiency in the chronic phase. Therefore, new drugs are urgently needed. Coordination compounds may be an interesting alternative for antiparasite therapy against Leishmania spp., Toxoplasma gondii and T. cruzi . Herein, we tested the in vitro effect on T. cruzi epimastigotes (Y strain) of two new μ-oxo Fe( iii ) dinuclear complexes: [(HL1)(Cl)Fe(μ-O)Fe(Cl)(HL2)](Cl) 2 ·(CH 3 CH 2 OH) 2 ·H 2 O (1) and [(HL2)(Cl)Fe(μ-O)Fe(Cl)(HL2)](Cl) 2 ·H 2 O (2) where HL1 and HL2 are ligands which contain two pyridines, amine and alcohol moieties with a naphthyl pendant unit yielding a N 3 O coordination environment. Complexes (1) and (2) , which are isomers, were completely characterized, including X-ray diffraction studies for complex (1) . Parasites were treated with the complexes and the outcome was analyzed. Complex (1) exhibited the lowest IC 50 values, which were 99 ± 3, 97 ± 2 and 110 ± 39 nM, after 48, 72 and 120 h of treatment, respectively. Complex (2) showed IC 50 values of 118 ± 5, 122 ± 6 and 104 ± 29 nM for the same treatment times. Low cytotoxicity to the host cell LLC-MK2 was found for both complexes, resulting in impressive selectivity indexes of 106 for complex (1) and 178 for (2) , after 120 h of treatment. Treatment with both complexes reduced the mitochondrial membrane potential of the parasite. Ultrastructural analysis of the parasite after treatment with complexes showed that the mitochondria outer membrane presented swelling and abnormal disposition around the kinetoplast; in addition, reservosomes presented anomalous spicules and rupture. The complexes showed low nanomolar IC 50 values affecting mitochondria and reservosomes, essential organelles for the survival of the parasite. The low IC 50 and the high selectivity index show that both complexes act as a new prototype of drugs against T. cruzi and may be used for further development in drug discovery to treat Chagas disease. Two new μ-oxo-diiron( iii ) complexes were synthesized and chemically characterized, and found to be active against T. cruzi epimastigotes at concentrations in the nanomolar range, showing low cytotoxicity to the host cell, resulting in an impressive SI.