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Published on: March 18, 2014
Deciphering the effect of an oxovanadium(iv) complex with the flavonoid chrysin (VOChrys) on intracellular cell
Ignacio E León1, Paula Díez2, Susana B Etcheverry1
1Chair of Patologic Biochemistry, Exact School Sciences, National University of La Plata, 47 y 115, 1900 La Plata, Argentina. etcheverry@biol.unlp.edu.ar and Inorganic Chemistry Center (CEQUINOR, CONICET), Exact School Sciences, National University of La Plata, 47 y 115, 1900 La Plata, Argentina.
Abstract:
Vanadium complexes were studied during recent years and considered as a representative of a new class of non-platinum metal antitumor agents in combination with their low toxicity. However, a few challenges still remain in the discovery of new molecular targets for these novel metal-based drugs. The study of cell signaling pathways related to vanadium drugs, which is highly critical for identifying specific targets that play an important role in the antitumor activity of vanadium compounds, is scarce. This research deals with the alterations in intracellular signaling pathways promoted by an oxovanadium(iv) complex with the flavonoid chrysin [VO(chrysin)2EtOH]2 (VOChrys) in a human osteosarcoma cell line (MG-63). Herein we report for the first time the effect of [VO(chrysin)2EtOH]2 on the relative abundance of 224 proteins, which are involved in the most common intracellular pathways. Besides, full-length human recombinant (FAK and AKT1) kinases are produced using an in situ IVTT system and then we have evaluated the variation of relative tyrosine-phosphorylation levels caused by the [VO(chrysin)2EtOH]2 compound. The results of the differential protein expression levels reveal that several proteins such as PKB/AKT, PAK, DAPK, Cdk 4, 6 and 7, FADD, AP2, NAK, and JNK, among others, were altered. Moreover, cell signaling pathways related to the PTK2B, FAK, PKC families suggests an important role associated with the antitumor activity of [VO(chrysin)2EtOH]2 was demonstrated. Finally, the effect of this compound on in situ expressed FAK and AKT1 is validated by determining the phosphorylation level, which decreased in the former and increased in the latter.
Insights
This study investigates a novel vanadium-chrysin complex, [VO(chrysin)2EtOH]2 (VOChrys), revealing its impact on intracellular signaling pathways and protein expression in human osteosarcoma cells. The findings highlight potential new molecular targets for vanadium-based antitumor drugs.
Area of Science:
- Biochemistry
- Pharmacology
- Oncology
Background:
- Vanadium complexes are emerging as promising low-toxicity antitumor agents.
- Identifying molecular targets for vanadium-based drugs is crucial for their clinical advancement.
- Research on cell signaling pathways affected by vanadium compounds remains limited.
Purpose of the Study:
- To investigate the effects of an oxovanadium(IV)-chrysin complex, [VO(chrysin)2EtOH]2 (VOChrys), on intracellular signaling pathways.
- To identify specific proteins and pathways modulated by VOChrys in human osteosarcoma cells (MG-63).
- To evaluate the impact of VOChrys on the tyrosine-phosphorylation levels of FAK and AKT1 kinases.
Main Methods:
- Proteomic analysis to determine the relative abundance of 224 intracellular proteins.
- In situ cell-free transcription/translation (IVTT) system to produce human recombinant FAK and AKT1 kinases.
- Assessment of tyrosine-phosphorylation levels of FAK and AKT1 in response to VOChrys treatment.
Main Results:
- VOChrys significantly altered the expression of key proteins involved in cell signaling, including PKB/AKT, PAK, DAPK, Cdk 4, 6 and 7, FADD, AP2, NAK, and JNK.
- Cell signaling pathways associated with PTK2B, FAK, and PKC families were implicated in the antitumor activity of VOChrys.
- Phosphorylation of FAK decreased, while AKT1 phosphorylation increased upon treatment with VOChrys.
Conclusions:
- The oxovanadium(IV)-chrysin complex VOChrys modulates critical intracellular signaling pathways in human osteosarcoma cells.
- The study identifies potential molecular targets and mechanisms underlying the antitumor activity of VOChrys.
- These findings support the development of novel vanadium-based metallodrugs for cancer therapy.
