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Updated: Nov 23, 2025
Cellular Toxicity of Nanogenomedicine in MCF-7 Cell Line: MTT assay
Published on: April 3, 2009
A novel method to detect intracellular metabolite alterations in MCF-7 cells by doxorubicin induced cell death
Ajay Kumar1, Sheetal Patel1, Devyani Bhatkar1
1Cancer and Translational Research Lab, Dr. D.Y. Patil Biotechnology & Bioinformatics Institute, Dr. D.Y. Patil Vidyapeeth, Pune, Maharashtra, 411033, India.
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.
Insights
This study identifies novel intracellular metabolites in MCF-7 cells treated with doxorubicin (DOX), revealing a caspase-3 independent cell death pathway. These findings highlight metabolic reprogramming in chemotherapy resistance and introduce a new method for metabolite analysis.
Area of Science:
- Cancer Biology
- Metabolomics
- Cellular Biochemistry
Background:
- Metabolic reprogramming in cancer cells can impede chemotherapy effectiveness.
- Tumor metabolic heterogeneity contributes to drug resistance, relapse, and secondary tumor formation.
Purpose of the Study:
- To investigate the role of intracellular metabolites in doxorubicin (DOX)-induced cell death in MCF-7 cells.
- To identify novel metabolites and elucidate their connection to chemotherapy resistance mechanisms.
- To showcase the utility of the vertical tube gel electrophoresis (VTGE) system for metabolite purification and analysis.
Main Methods:
- MCF-7 cells were treated with DOX, and apoptotic cell death was assessed using PI/annexin V staining and immunoblot assays.
- A novel metabolite fractionation system, vertical tube gel electrophoresis (VTGE), was employed to purify intracellular metabolites (100–1000 Da) from cell lysates.
- Purified metabolites were identified using liquid chromatography-high-resolution mass spectrometry (LC-HRMS).
Main Results:
- Doxorubicin treatment induced cleaved PARP 1 but not active caspase 3 in MCF-7 cells, indicating a caspase-3 independent apoptotic pathway.
- Key intracellular metabolites, including lipids (CDP-DG, phytosphingosine, dodecanamide), non-lipids (N-acetyl-D-glucosamine, N1-acetylspermidine, gamma-L-glutamyl-L-cysteine), and tripeptides, were identified.
- The study reported the first evidence of doxorubicinone, an aglycone form of DOX, in MCF-7 cells, potentially linked to cell death.
Conclusions:
- The identified intracellular metabolites support a caspase-3 independent, mitochondria-induced apoptotic cell death mechanism in DOX-treated MCF-7 cells.
- The vertical tube gel electrophoresis (VTGE) system offers a novel and effective method for purifying and analyzing intracellular metabolites.
- These findings provide a proof of concept for applying VTGE in diverse cell culture models for metabolomic studies.
