Synthetic ease and exceptional in vivo performance of pyrazole-based cyclometallated iridium complexes
Redrado, Marta ; Romanos, Eduardo ; Benedi, Andrea (Universidad de Zaragoza) ; Canudo-Barreras, Guillermo ; Marzo, Isabel (Universidad de Zaragoza) ; Gimeno, M. Concepción ; Fernández-Moreira, Vanesa (Universidad de Zaragoza)
Resumen: Two luminescent cyclometallated IrIII complexes of the type [Ir(C^N)2(N^N)]x (X = 0 (1), and X = +1 (2)) were prepared using methyl 2-phenylquinoline-4-carboxylate as C^N ligands and either a deprotonated or protonated 3-(2-pyridyl)pyrazole as the N^N chelate. The synthesis followed a well-established and straightforward procedure. Photophysical analysis unveiled their remarkable properties, featuring phosphorescent red and orange emissions attributed to 3MLCT and 3LLCT transitions, with high emissive quantum yields in degassed DMSO solutions. Importantly, these complexes exhibited dual functionality as potent chemotherapeutic agents and photosensitisers, with their effectiveness tailored to specific cancer cell lines. Phototherapeutic treatment was particularly effective against lung cancer A549 cells, while a chemotherapeutic approach yielded superior results against breast cancer 4T1-luc2 cells. Both complexes primarily targeted lysosomes, leading to cell death through apoptotic pathways, with IC50 values in the nanomolar range. Importantly, they demonstrated no cytotoxicity against lymphocytes, mimicking the behaviour observed in healthy cells. Encouragingly, 1 and 2 exhibited minimal in vivo toxicity. The most striking finding was the exceptional chemotherapeutic efficacy of complexes 1 and 2 against 4T1-luc2 cells in BALB/c mice. These complexes surpassed the performance of the clinically employed 5-fluorouracil, especially at early tumor stages, significantly retarding 4T1-luc2 proliferation. Further investigations at vascularised and organised tumor stages revealed that complex 1 could reduce tumor size by half compared to untreated mice, which was also confirmed through tumoral weight analysis. While these findings are preliminary, the outstanding performance of these complexes at early tumor stages against breast cancer 4T1-luc2 in vivo, their selective therapeutic feasibility (chemotherapy vs. PDT) tailored to specific cancerous cell lines, and their straightforward synthetic design make them highly attractive candidates for cancer treatment.
Idioma: Inglés
DOI: 10.1039/d3qi02355a
Año: 2024
Publicado en: Inorganic Chemistry Frontiers 11 (2024), 1828-1838
ISSN: 2052-1545
Financiación: info:eu-repo/grantAgreement/ES/DGA/E07-23R
Financiación: info:eu-repo/grantAgreement/ES/MICINN AEI/PID2022-136861NB-I00
Financiación: info:eu-repo/grantAgreement/ES/MICINN AEI/PID2022-137862NB-I00
Tipo y forma: Article (Published version)
Área (Departamento): Área Química Inorgánica (Dpto. Química Inorgánica)
Área (Departamento): Área Biología Celular (Dpto. Bioq.Biolog.Mol. Celular)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes.
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Idioma: Inglés
DOI: 10.1039/d3qi02355a
Año: 2024
Publicado en: Inorganic Chemistry Frontiers 11 (2024), 1828-1838
ISSN: 2052-1545
Financiación: info:eu-repo/grantAgreement/ES/DGA/E07-23R
Financiación: info:eu-repo/grantAgreement/ES/MICINN AEI/PID2022-136861NB-I00
Financiación: info:eu-repo/grantAgreement/ES/MICINN AEI/PID2022-137862NB-I00
Tipo y forma: Article (Published version)
Área (Departamento): Área Química Inorgánica (Dpto. Química Inorgánica)
Área (Departamento): Área Biología Celular (Dpto. Bioq.Biolog.Mol. Celular)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes. Exportado de SIDERAL (2024-03-15-08:50:55)
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Articles > Artículos por área > Química Inorgánica
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Record created 2024-03-15, last modified 2024-03-15