Dual Inhibition of PARP and Akt Induces Metabolic Collapse and Apoptosis in Breast Cancer Cells
Nasreldeen Mohamed Karshom Adam1, Eszter Vámos1, Hamid Ahmadi2
1Department of Biochemistry and Medical Chemistry, Medical School, University of Pécs, 7624 Pécs, Hungary.
Background:
Breast cancer is the most prevalent cancer among women worldwide, and therapeutic resistance represents a major clinical challenge. Mitochondria are key regulators of cancer metabolism, redox homeostasis, and apoptosis, making them potential therapeutic targets.
Aim:
This study aimed to evaluate the effects of combined Akt and PARP inhibition on mitochondrial metabolic function, energy production, and apoptosis in breast cancer cells.
Methodology:
The SRB assay was used to compare the viability of MDA-MB-231 and MCF7 cells. A colony formation assay was conducted to assess the capacity of individual cells to develop colonies, and ROS production was quantified using DHR123. Flow cytometric analysis was performed to evaluate cell death, and the Seahorse Mito stress test was used to measure ATP production and essential mitochondrial parameters.
Results:
The combination of Akt and PARP inhibitors impaired oxidative phosphorylation without inducing a compensatory shift to glycolysis, leading to reduced ATP production, increased ROS generation, and apoptotic cell death in breast cancer cells compared to monotherapy.
Conclusions And Recommendations:
These findings indicate that the combination of olaparib and capivasterib is a promising therapeutic strategy for breast cancer. Furthermore, evaluation of in vivo toxicity and antitumor effectiveness is essential to validate its potential.
Insights
Combining Akt and PARP inhibitors reduces breast cancer cell energy production and induces cell death. This dual inhibition strategy impairs mitochondrial function, offering a promising therapeutic approach for breast cancer treatment.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Breast cancer is a leading global cancer in women, with therapeutic resistance posing a significant clinical hurdle.
- Mitochondria play crucial roles in cancer cell metabolism, redox balance, and apoptosis, identifying them as key therapeutic targets.
Purpose of the Study:
- To investigate the impact of combined Akt and PARP inhibition on mitochondrial metabolism, energy generation, and apoptosis in breast cancer cells.
- To assess the synergistic effects of dual inhibition compared to monotherapy.
Main Methods:
- Cell viability was assessed using the SRB assay.
- Colony formation capacity, reactive oxygen species (ROS) production, and cell death were evaluated.
- Mitochondrial function, including ATP production, was measured using the Seahorse Mito stress test.
Main Results:
- Combined Akt and PARP inhibition disrupted oxidative phosphorylation without a compensatory increase in glycolysis.
- This led to significantly reduced ATP production and elevated ROS generation in breast cancer cells.
- The combination therapy induced apoptotic cell death more effectively than monotherapy.
Conclusions:
- The combination of olaparib and capivasterib presents a promising therapeutic strategy for breast cancer by targeting mitochondrial function.
- Further in vivo studies are necessary to confirm the antitumor effectiveness and safety of this combined therapeutic approach.
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