Abstract
Background
Metabolic reprogramming within cancer cells has been recognized as a potential barrier to chemotherapy. Additionally, metabolic tumor heterogeneity is the one of factors behind discernible hallmarks such as drug resistance, relapse of the tumor and the formation of secondary tumors.
Methods
In this paper, cell-based assays including PI/annexin V staining and immunoblot assay were performed to show the apoptotic cell death in MCF-7 cells treated with DOX. Further, MCF-7 cells were lysed in a hypotonic buffer and the whole cell lysate was purified by a novel and specifically designed metabolite (~ 100 to 1000 Da) fractionation system called vertical tube gel electrophoresis (VTGE). Further, purified intracellular metabolites were subjected to identification by LC-HRMS technique.
Results
Cleaved PARP 1 in MCF-7 cells treated with DOX was observed in the present study. Concomitantly, data showed the absence of active caspase 3 in MCF-7 cells. Novel findings are to identify key intracellular metabolites assisted by VTGE system that include lipid (CDP-DG, phytosphingosine, dodecanamide), non-lipid (N-acetyl-D-glucosamine, N1-acetylspermidine and gamma-L-glutamyl-L-cysteine) and tripeptide metabolites in MCF-7 cells treated by DOX. Interestingly, we reported the first evidence of doxorubicinone, an aglycone form of DOX in MCF-7 cells that are potentially linked to the mechanism of cell death in MCF-7 cells.
Conclusion
This paper reported novel methods and processes that involve VTGE system based purification of hypotonically lysed novel intracellular metabolites of MCF-7 cells treated by DOX. Here, these identified intracellular metabolites corroborate to caspase 3 independent and mitochondria induced apoptotic cell death in MCF-7 cells. Finally, these findings validate a proof of concept on the applications of novel VTGE assisted purification and analysis of intracellular metabolites from various cell culture models.
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Acknowledgements
The authors acknowledge financial support from Dr. D.Y. Patil Vidyapeeth, Pune, India (DPU/05/01/2016). This manuscript has been released as a Pre-Print at “bioRxiv”.
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This study was funded by DPU, Pune, India (Grant Number DPU/2016).
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AK: Data collection and preparation of manuscript draft. SP: Data collection. DB: Preparation of manuscript draft. SCS: Design of experiment and preparation of manuscript draft. NKS: Conceptualization of work, design of experiment and preparation of manuscript draft.
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Kumar, A., Patel, S., Bhatkar, D. et al. A novel method to detect intracellular metabolite alterations in MCF-7 cells by doxorubicin induced cell death. Metabolomics 17, 3 (2021). https://doi.org/10.1007/s11306-020-01755-2
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DOI: https://doi.org/10.1007/s11306-020-01755-2