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Could 99mTc-MIBI be used to visualize the apoptotic MCF7 human breast cancer cells?
J Vergote1, M Di Benedetto, J L Moretti
1Department of Nuclear Medicine, Avicenne Hospital, Bobigny, France. jean-luc.moretti@avc.ap-hop-paris.fr
Abstract:
Defects in key components of apoptotic pathways provide a survival advantage to cells and have been implicated as important factors in tumorogenesis. As therapeutic drug-induced apoptosis is a key component in treatment of most cancers, alterations in apoptotic pathways may be critical to drug resistance. The question is: would it be possible to distinguish apoptotic cells and resistant cells with a same radiotracer? In this study, we investigated the ability of sodium phenylacetate (NaPa), a natural cytostatic proapoptotic metabolite, to induce apoptosis in MCF7 human breast cancer cells. Then, we tested the 99mTc-MIBI accumulation in these apoptotic cells. Annexin V-FITC was used to identify apoptotic cells by flow cytometry. Ours results demonstrated that a 72 hr treatment of MCF7 cells with 40 mM NaPa induced apoptosis in 60% of cells. In a parallel way, 99mTc-MIBI accumulation in NaPa treated cells decreased for concentrations higher than 20 mM NaPa. Thus, 99mTc-MIBI accumulation decreased correlatively with the increasing percentage of apoptotic cells obtained by treatment of MCF7 cells with NaPa. These data demonstrate that NaPa induced apoptosis in MCF7 cells and that 99mTc-MIBI is a negative tracer of apoptosis: the more MCF7 cells were engaged in the apoptotic pathway, the more 99mTc-MIBI accumulation decreased in these MCF7 apoptotic cells.
Insights
Sodium phenylacetate (NaPa) induces apoptosis in breast cancer cells. Technetium-99m-methoxyisobutyl-isonitrile (99mTc-MIBI) accumulation decreases as apoptosis increases, indicating it
Area of Science:
- Oncology
- Cell Biology
- Radiochemistry
Background:
- Apoptotic pathway defects promote tumor growth and drug resistance.
- Targeting apoptosis is crucial for cancer therapy.
- Distinguishing apoptotic from resistant cells using radiotracers is a clinical challenge.
Purpose of the Study:
- To investigate sodium phenylacetate (NaPa) as an apoptosis inducer in MCF7 breast cancer cells.
- To evaluate technetium-99m-methoxyisobutyl-isonitrile (99mTc-MIBI) as a potential apoptosis tracer.
- To determine if 99mTc-MIBI accumulation correlates with NaPa-induced apoptosis.
Main Methods:
- MCF7 human breast cancer cells were treated with NaPa.
- Apoptosis was quantified using Annexin V-FITC and flow cytometry.
- 99mTc-MIBI accumulation was measured in treated cells.
Main Results:
- NaPa treatment (40 mM, 72 hr) induced apoptosis in 60% of MCF7 cells.
- 99mTc-MIBI accumulation decreased with increasing NaPa concentrations (>20 mM).
- A negative correlation was observed between 99mTc-MIBI accumulation and the percentage of apoptotic cells.
Conclusions:
- NaPa effectively induces apoptosis in MCF7 breast cancer cells.
- 99mTc-MIBI serves as a negative tracer for apoptosis.
- Decreased 99mTc-MIBI accumulation indicates increased cellular apoptosis.