Exploring a natural MDR reversal agent: potential of medicinal food supplement Nerium oleander leaf distillate
Meltem Demirel Kars1, Ufuk Gündüz, Kamil Uney
1Selçuk University, Sarayönü Vocational High School, 42430 Konya, Turkey. meltem@selcuk.edu.tr
Objective:
To investigate the molecular effects of Nerium oleander leaf distillate on paclitaxel and vincristine resistant (MCF-7/Pac and MCF-7/Vinc) cells and sensitive (MCF-7/S) cell lines.
Methods:
Nerium oleander (N. oleander) leaf extract was obtained by hydrodistillation method. The toxicological effects of N. oleander distillate, previously suggested as medicinal food supplement, on drug resistant cells were evaluated by XTT tests. MDR modulation potential of the plant material was evaluated by flow cytometry and fluorescent microscopy. Paclitaxel and vincristine were applied to the sublines in combination with N. oleander distillate.
Results:
Fractional inhibitory indices show that N. oleander distillate did not increase the antiproliferative effects of anticancer drugs. N. oleander treatment in to MCF-7/Pac and MCF-7/Vinc did not inhibit P-gp activity and MDR1 gene expression level.
Conclusions:
As a result it may be suggested that although N. oleander distillate has some medicinal effects as food supplement it may not be suitable as an MDR modulator for drug resistant breast cancer cells.
Insights
Nerium oleander leaf distillate did not enhance anticancer drug efficacy or overcome multidrug resistance (MDR) in breast cancer cells. This suggests it is not suitable as an MDR modulator for drug-resistant breast cancer.
Area of Science:
- Pharmacology
- Molecular Biology
- Cancer Research
Background:
- Multidrug resistance (MDR) is a major challenge in cancer chemotherapy.
- Nerium oleander (N. oleander) has been explored for potential medicinal properties.
- Investigating natural compounds for MDR modulation is crucial for improving treatment outcomes.
Purpose of the Study:
- To evaluate the molecular effects of N. oleander leaf distillate on drug-resistant (MCF-7/Pac, MCF-7/Vinc) and sensitive (MCF-7/S) breast cancer cell lines.
- To determine if N. oleander distillate can modulate multidrug resistance mechanisms.
Main Methods:
- Hydrodistillation was used to obtain N. oleander leaf extract.
- XTT assays assessed the toxicological effects of the distillate on drug-resistant cells.
- Flow cytometry and fluorescent microscopy evaluated MDR modulation potential, with paclitaxel and vincristine used in combination with N. oleander distillate.
Main Results:
- N. oleander distillate did not increase the antiproliferative effects of paclitaxel or vincristine.
- Treatment with N. oleander distillate did not inhibit P-glycoprotein (P-gp) activity.
- N. oleander distillate did not affect MDR1 gene expression levels in resistant cell lines.
Conclusions:
- N. oleander distillate, while possessing some medicinal effects as a food supplement, is not effective as an MDR modulator for drug-resistant breast cancer cells.
- The study indicates N. oleander distillate's limitations in overcoming key mechanisms of chemotherapy resistance.