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  • An Organometallic Gold(I) Bis-N-Heterocyclic Carbene Complex with Multimodal Activity in Ovarian Cancer Cells.

An Organometallic Gold(I) Bis-N-Heterocyclic Carbene Complex with Multimodal Activity in Ovarian Cancer Cells.

Chemistry (Weinheim an der Bergstrasse, Germany) (2020-09-10)
Samuel M Meier-Menches, Benjamin Neuditschko, Katja Zappe, Martin Schaier, Marlene C Gerner, Klaus G Schmetterer, Giorgia Del Favero, Riccardo Bonsignore, Margit Cichna-Markl, Gunda Koellensperger, Angela Casini, Christopher Gerner
ABSTRACT

The organometallic AuI bis-N-heterocyclic carbene complex [Au(9-methylcaffeine-8-ylidene)2 ]+ (AuTMX2 ) was previously shown to selectively and potently stabilise telomeric DNA G-quadruplex (G4) structures. This study sheds light on the molecular reactivity and mode of action of AuTMX2 in the cellular context using mass spectrometry-based methods, including shotgun proteomics in A2780 ovarian cancer cells. In contrast to other metal-based anticancer agents, this organogold compound is less prone to form coordinative bonds with biological nucleophiles and is expected to exert its drug effects mainly by non-covalent interactions. Global protein expression changes of treated cancer cells revealed a multimodal mode of action of AuTMX2 by alterations in the nucleolus, telomeres, actin stress-fibres and stress-responses, which were further supported by pharmacological assays, fluorescence microscopy and cellular accumulation experiments. Proteomic data are available via ProteomeXchange with identifier PXD020560.

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S(−)-Verapamil hydrochloride hydrate, ≥98% (HPLC), powder