RESUMEN
Platinum-based drugs have revolutionized cancer care, but are unfortunately associated with various adverse effects. Meanwhile, natural product scaffolds exhibit multifarious bioactivities and serve as an attractive resource for cancer therapy development. Thus, the conjugation of natural product scaffolds to metal complexes becomes an attractive strategy to reduce the severe side effects arising from the use of metal bearing drugs. This review aims to highlight the recent examples of natural product-conjugated metal complexes as cancer therapies with enhanced selectivity and efficacy. We discuss the mechanisms and features of different conjugate complexes and present an outlook and perspective for the future of this field.
Asunto(s)
Productos Biológicos/uso terapéutico , Complejos de Coordinación/uso terapéutico , Metales/uso terapéutico , Neoplasias/tratamiento farmacológico , Animales , Productos Biológicos/química , Complejos de Coordinación/química , Humanos , Metales/efectos adversosRESUMEN
trans-[Ru(16-TMC)(C[triple bond]N)2] (1; 16-TMC = 1,5,9,13-tetramethyl-1,5,9,13-tetraazacyclohexadecane) was prepared by the reaction of trans-[Ru(16-TMC)Cl2]Cl with KCN in the presence of zinc powder. The oxidation of 1 with bromine gave trans-[Ru(16-TMC)(CN)2]+ isolated as PF6 salt (2.PF6). The Ru-C/C-N distances are 2.061(4)/1.130(5) and 2.069(5)/1.140(7) A for 1 and 2, respectively. Both complexes show a Ru(III/II) couple at 0.10 V versus FeCp2+/0. The UV-vis absorption spectrum of 1 is dominated by an intense high-energy absorption at lambda(max) = 230 nm, which is mainly originated from dpi(RuII) --> pi*(N[triple bond]C-Ru-C[triple bond]N) charge-transfer transition. Complex 2 shows intense absorption bands at lambda(max)
Asunto(s)
Aminas/química , Cianuros/química , Compuestos Macrocíclicos/química , Compuestos Organometálicos/química , Rutenio/química , Aminas/síntesis química , Cristalografía por Rayos X , Cianuros/síntesis química , Electroquímica , Ligandos , Compuestos Macrocíclicos/síntesis química , Compuestos Organometálicos/síntesis química , Espectrofotometría Ultravioleta , Espectrometría RamanRESUMEN
Phosphorescent iridium(iii) complexes have gained increasing attention in biological applications owing to their excellent photophysical properties and efficient transportation into live cells. Their advantageous properties make them useful tools for enabling the intracellular detection of many different species for biological and medical applications. In this review, we summarize recent studies on the combination of iridium(iii) complexes and nanomaterials for intracellular sensing, drug delivery and photodynamic therapy. Various mechanisms and application modes are described and compared, and the outlook and future directions of this field are discussed as well.
RESUMEN
A sensitive turn-on luminescent sensor for H2O2 based on the silver nanoparticle (AgNP)-mediated quenching of an luminescent Ir(III) complex (Ir-1) has been designed. In the absence of H2O2, the luminescence intensity of Ir-1 can be quenched by AgNPs via non-radiative energy transfer. However, H2O2 can oxidize AgNPs to soluble Ag+ cations, which restores the luminescence of Ir-1. The sensing platform displayed a sensitive response to H2O2 in the range of 0-17 µM, with a detection limit of 0.3 µM. Importantly, the probe was successfully applied to monitor intracellular H2O2 in living cells, and it also showed high selectivity for H2O2 over other interfering substances.