Abstract
Purpose
Ivermectin is an antiparasitic drug that exhibits antitumor effects in preclinical studies, and as such is currently being repositioned for cancer treatment. However, divergences exist regarding its employed doses in preclinical works. Therefore, the aim of this study was to determine whether the antitumor effects of ivermectin are observable at clinically feasible drug concentrations.
Methods
Twenty-eight malignant cell lines were treated with 5 μM ivermectin. Cell viability, clonogenicity, cell cycle, cell death and pharmacological interaction with common cytotoxic drugs were assessed, as well as the consequences of its use on stem cell-enriched populations. The antitumor in vivo effects of ivermectin were also evaluated.
Results
The breast MDA-MB-231, MDA-MB-468, and MCF-7, and the ovarian SKOV-3, were the most sensitive cancer cell lines to ivermectin. Conversely, the prostate cancer cell line DU145 was the most resistant to its use. In the most sensitive cells, ivermectin induced cell cycle arrest at G0–G1 phase, with modulation of proteins associated with cell cycle control. Furthermore, ivermectin was synergistic with docetaxel, cyclophosphamide and tamoxifen. Ivermectin reduced both cell viability and colony formation capacity in the stem cell-enriched population as compared with the parental one. Finally, in tumor-bearing mice ivermectin successfully reduced both tumor size and weight.
Conclusion
Our results on the antitumor effects of ivermectin support its clinical testing.
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Acknowledgements
We thank Rocío Morales-Bárcenas for her technical support with the use of the flow cytometer at the National Institute of Oncology (Mexico City, Mexico). This work was supported by the National Council of Science and Technology (CONACYT) scholarship # 288278, provided to MJ. MJ is a student belonging to the Programa de Ciencias Bioquímicas, and ASC to the Plan de Estudios Combinados en Medicina, both from the UNAM.
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All animal experiments were approved and conducted under the guidelines of the Bioethical and Scientific committees of the National Institute of Oncology (protocol numbers CEI/1145/17 and 017/016/IBI, respectively), in Mexico City, Mexico.
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Supplementary file3 (TIFF 1853 kb) Fluorescence-activated cell sorting of the SKOV-3, MCF-7 and MDA-MB-468 cell lines. The parental cell line SKOV-3, MCF-7 and MDA-MB-468 had a cancer stem-like population in the range of 0.3% (A), 1.9% (C) and 5.5% (E), respectively, which increased to 30.8% (B), 34.8% (D), and 12.8% (F) after the sorting, respectively
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Juarez, M., Schcolnik-Cabrera, A., Dominguez-Gomez, G. et al. Antitumor effects of ivermectin at clinically feasible concentrations support its clinical development as a repositioned cancer drug. Cancer Chemother Pharmacol 85, 1153–1163 (2020). https://doi.org/10.1007/s00280-020-04041-z
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DOI: https://doi.org/10.1007/s00280-020-04041-z