ArticleInternational journal of molecular sciences2025
Imidazolinium-Based NHC-Metal Complexes Overcome Both Cancer Multidrug Resistance and Cisplatin Resistance In Vitro.
Article in International journal of molecular sciences, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
We report the synthesis and biological characterization of N-heterocyclic carbene (NHC) complexes with gold(I), silver(I), copper(I), and palladium(II) metal centers, and 3-(2,6-diisopropyl-phenyl) imidazolinium- and imidazolium-based ligands, including their biscarbene complexes, along with metal complexes of 4-(S)-tert-butyl-imidazolinium-derived carbenes carrying various substituents in position 1. Compared to the imidazolium complexes, the corresponding imidazolinium complexes displayed superior cytotoxicity against the Mes-Sa uterine sarcoma cell line, while the biscarbene complexes exhibited greatly enhanced cytotoxicity with nanomolar activity. The ABCB1-overexpressing multidrug-resistant sublines of Mes-Sa demonstrated only marginal resistance to monocarbene imidazolinium complexes lacking a 4-(S)-tert-butyl group, whereas significant resistance was observed for all other complexes, with its extent further influenced by the nature of the metal center. Probing a subset of the complexes confirmed their strong cytotoxicity against the CST murine breast cancer cell line and its cisplatin-resistant variant, with little or no cross-resistance observed. Within a defined subset, compounds triggered apoptosis, and intracellular ROS production was consistently induced by the copper complexes. Collectively, these results indicate that imidazolinium-based metal NHCs are promising anticancer drug candidates, with copper and silver centers standing out for their potent cytotoxicity and evasion of both ABCB1-mediated and cisplatin resistance.
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