Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz

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SHR Neuro Krebs Kardio Lipid Stoffw Microb

Hager, S; Korbula, K; Bielec, B; Grusch, M; Pirker, C; Schosserer, M; Liendl, L; Lang, M; Grillari, J; Nowikovsky, K; Pape, VFS; Mohr, T; Szakács, G; Keppler, BK; Berger, W; Kowol, CR; Heffeter, P.
The thiosemicarbazone Me₂NNMe₂ induces paraptosis by disrupting the ER thiol redox homeostasis based on protein disulfide isomerase inhibition.
Cell Death Dis. 2018; 9(11):1052-1052 Doi: 10.1038/s41419-018-1102-z [OPEN ACCESS]
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Co-Autor*innen der Med Uni Graz: Lang Magdalena
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Abstract:: Due to their high biological activity, thiosemicarbazones have been developed for treatment of diverse diseases, including cancer, resulting in multiple clinical trials especially of the lead compound Triapine. During the last years, a novel subclass of anticancer thiosemicarbazones has attracted substantial interest based on their enhanced cytotoxic activity. Increasing evidence suggests that the double-dimethylated Triapine derivative Me₂NNMe₂ differs from Triapine not only in its efficacy but also in its mode of action. Here we show that Me₂NNMe₂- (but not Triapine)-treated cancer cells exhibit all hallmarks of paraptotic cell death including, besides the appearance of endoplasmic reticulum (ER)-derived vesicles, also mitochondrial swelling and caspase-independent cell death via the MAPK signaling pathway. Subsequently, we uncover that the copper complex of Me₂NNMe₂ (a supposed intracellular metabolite) inhibits the ER-resident protein disulfide isomerase, resulting in a specific form of ER stress based on disruption of the Ca²⁺ and ER thiol redox homeostasis. Our findings indicate that compounds like Me₂NNMe₂ are of interest especially for the treatment of apoptosis-resistant cancer and provide new insights into mechanisms underlying drug-induced paraptosis.
Find related publications in this database (using NLM MeSH Indexing): Antineoplastic Agents - chemical synthesis; Antineoplastic Agents - pharmacology; Cell Death - drug effects; Cell Line, Tumor -; Cell Survival - drug effects; Coordination Complexes - chemistry; Coordination Complexes - pharmacology; Copper - chemistry; Copper - metabolism; Endoplasmic Reticulum - drug effects; Endoplasmic Reticulum - metabolism; Endoplasmic Reticulum - pathology; Endoplasmic Reticulum Stress - drug effects; Epithelial Cells - drug effects; Epithelial Cells - metabolism; Epithelial Cells - pathology; Gene Expression -; HCT116 Cells -; Humans -; MAP Kinase Signaling System - drug effects; MAP Kinase Signaling System - genetics; Mitochondria - drug effects; Mitochondria - metabolism; Mitochondria - pathology; Mitochondrial Swelling - drug effects; Oxidation-Reduction - drug effects; Protein Disulfide-Isomerases - antagonists & inhibitors; Protein Disulfide-Isomerases - genetics; Protein Disulfide-Isomerases - metabolism; Pyridines - pharmacology; Sulfhydryl Compounds - antagonists & inhibitors; Sulfhydryl Compounds - metabolism; Thiosemicarbazones - chemical synthesis; Thiosemicarbazones - pharmacology