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Profiling Ubiquitin and Ubiquitin-like Dependent Post-translational Modifications and Identification of Significant Alterations
Published on: November 7, 2019
[Proteomic approach to the effect of epirubicin on hepatoma cells at subcellular level]
1Chong Qing University of Medical sciences, Department of Laboratory Science, Chongqing 400016.
Abstract:
Epirubicin is an antineoplastic agent known as an anthracycline. It acts directly on DNA by blocking its replication and transcription, so apoptosis can be induced for cancer cells. The protein expression of cancer cells will be altered due to the induction of pharmacological action of epirubicin, so it is important to pay attention to the altered profiling of proteins. Here proteomic strategy was applied to the hepatoma cells at subcellular level, comparative proteome analysis of mitochondria and nucleus were conducted between the hepatoma cells administered with epirubicin and the not-administered. Centrifugation was used for the subcellular fractionation, then 2-DE for the separation of proteins, imaging analysis for the diction of expression-altered spots, and MALDI-TOF-MS for the identification of proteins. In total, 15 proteins were found to have altered their expression after the induction of epirubicin, among them, 5 proteins showed up-regulated expression and 10 showed down-regulated expression. These altered proteins are involved in life processes of cells such as energy metabolism, protein biosynthesis, structure of cell skeleton, processing and maturation of mRNA, heat shock of cells and apoptosis.
Insights
Epirubicin treatment alters protein expression in hepatoma cells, impacting key cellular processes. This proteomic study identified 15 differentially expressed proteins, offering insights into epirubicin
Area of Science:
- Molecular Biology
- Proteomics
- Cancer Research
Background:
- Epirubicin, an anthracycline antineoplastic agent, induces cancer cell apoptosis by interfering with DNA replication and transcription.
- Altered protein expression profiles in cancer cells are a consequence of epirubicin's pharmacological action, necessitating detailed proteomic investigation.
Purpose of the Study:
- To perform a comparative proteomic analysis of mitochondria and nucleus in hepatoma cells treated with epirubicin versus untreated controls.
- To identify specific proteins with altered expression levels following epirubicin administration at a subcellular level.
Main Methods:
- Subcellular fractionation using centrifugation to isolate mitochondria and nucleus.
- Two-dimensional gel electrophoresis (2-DE) for protein separation.
- MALDI-TOF-MS (Matrix-Assisted Laser Desorption/Ionization–Time of Flight Mass Spectrometry) for protein identification.
Main Results:
- A total of 15 proteins exhibited altered expression in epirubicin-treated hepatoma cells.
- Of these, 5 proteins were found to be up-regulated and 10 were down-regulated.
- Affected proteins are implicated in critical cellular functions including energy metabolism, protein biosynthesis, mRNA processing, heat shock response, and apoptosis.
Conclusions:
- Epirubicin significantly impacts the proteome of hepatoma cells at both mitochondrial and nuclear levels.
- The identified differentially expressed proteins provide potential biomarkers and targets for understanding epirubicin's mechanism of action and therapeutic efficacy.
