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Planta Med 2016; 82(04): 312-321
DOI: 10.1055/s-0035-1558289
Biological and Pharmacological Activity
Original Papers
Georg Thieme Verlag KG Stuttgart · New York

Thymoquinone from Nigella sativa Seeds Promotes the Antitumor Activity of Noncytotoxic Doses of Topotecan in Human Colorectal Cancer Cells in Vitro

Rana Khalife
1   Department of Natural Sciences, Lebanese American University of Beirut, Beirut, Lebanon
2   Faculty of Science, Beirut Arab University, Debbieh, Lebanon
,
Mohammad Hassan Hodroj
1   Department of Natural Sciences, Lebanese American University of Beirut, Beirut, Lebanon
,
Rajaa Fakhoury
2   Faculty of Science, Beirut Arab University, Debbieh, Lebanon
,
Sandra Rizk
1   Department of Natural Sciences, Lebanese American University of Beirut, Beirut, Lebanon
› Institutsangaben
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Publikationsverlauf

received 16. März 2015
revised 01. Oktober 2015

accepted 20. Oktober 2015

Publikationsdatum:
05. Februar 2016 (online)

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Abstract

Topotecan, a topoisomerase I inhibitor, is an anticancer drug widely used in the therapy of lung, ovarian, colorectal, and breast adenocarcinoma. Due to the primary dose-limiting toxicity of topotecan, which is myelosuppressive, it is necessary to identify other chemotherapeutic agents that can work synergistically with topotecan to increase its efficacy and limit its toxicity. Many studies have shown synergism upon the combination of topotecan with other chemotherapeutic agents such as gemcitabine. Other studies have demonstrated that pre-exposing cells to naturally occurring compounds such as thymoquinone, followed by gemcitabine or oxaliplatin, resulted in higher growth inhibition compared to treatment with gemcitabine or oxaliplatin alone. Our aim was to elucidate the underlying mechanism of action of topotecan in the survival and apoptotic pathways in human colon cancer cell lines in comparison to thymoquinone, to study the proapoptotic and antiproliferative effects of thymoquinone on the effectiveness of the chemotherapeutic agent topotecan, and to investigate the potential synergistic effect of thymoquinone with topotecan. Cells were incubated with different topotecan and thymoquinone concentrations for 24 and 48 hours in order to determine the IC50 for each drug. Combined therapy was then tested with ± 2 values for the IC50 of each drug. The reduction in proliferation was significantly dose- and time-dependent. After determining the best combination (40 µM thymoquinone and 0.6 µM topotecan), cell proteins were extracted after treatment, and the expression levels of B-cell lymphoma 2 and of its associated X protein, proteins p53 and p21, and caspase-9, caspase-3, and caspase-8 were studied by Western blot. In addition, cell cycle analysis and annexin/propidium iodide staining were performed. Both drugs induced apoptosis through a p53-independent mechanism, whereas the expression of p21 was only seen in thymoquinone treatment. Cell cycle arrest in the S phase was detected with each compound separately, while combined treatment only increased the production of fragmented DNA. Both compounds induced apoptosis through the extrinsic pathway after 24 hours; however, after 48 hours, the intrinsic pathway was activated by topotecan treatment only. In conclusion, thymoquinone increased the effectiveness of the chemotherapeutic reagent topotecan by inhibiting proliferation and lowering toxicity through p53- and Bax/Bcl2-independent mechanisms.

Key words

Nigella sativa - Ranunculaceae - topotecan - thymoquinone - colorectal cancer - apoptosis - caspases
 

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