Abstract
Indole-3-carbinol (I3C) is a naturally occurring glucosinolate found in Brassica vegetables that is usually converted in gastric acidic environment to the efficient metabolite 3,3′-diindolylmethane (DIM). Both indoles (I3C and DIM) are known chemopreventive agents for various cancers including breast cancer. This study aimed to investigate the influence of both indoles on the tumor suppressor miRNAs (let-7a-e, miR-15a, miR-16, miR-17-5p, miR-19a, and miR-20a) and oncomiRs (miR-181a, miR-181b, miR-210, miR-221, and miR-106a), which are controlling the cell cycle key regulators: cyclin-dependent kinases (CDKs), CDK inhibitor p27Kip1, and cyclin D1. Our results indicated that both indoles generally elevated the expression of the tumor suppressor miRNAs let-7a-e, miR-19a, miR-17-5p, and miR-20a and decreased the expression of the oncomiR list. Both indoles were able to significantly suppress the expression of CDK4 and CDK6 as well as the apoptotic markers Bcl-2 and survivin. Both indoles decreased cyclin-D1 protein, where I3C decreased cytoplasmic and nuclear cyclin-D1 significantly. Cytoplasmic and nuclear P27Kip1 showed overexpression following treatment with I3C higher than that detected following DIM treatment. This study provides a mechanistic elucidation of the previously reported cell cycle arrest by I3C and DIM in breast cancer cells suggesting that this effect could be through modulation of miRNAs expression that, in turn, regulates the genetic network controlling the G1/S phase in cell cycle progression.
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This research was financially supported by the National Research Centre, Cairo, Egypt (NRC project grant No# 11010332, Principle Investigator; Sherien M. El-Daly).
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S.M.E. is the principal investigator of the project; S.M.E. and A.M.G. planned for the project; S.M.E., S.A.G., and M.T.A. performed the required experiments; S.M.E. wrote the manuscript in consultation with A.M.G; S.M.E., A.M.G., and G.E. participated in drafting the article and reviewing the manuscript. All authors discussed the results and contributed to the final form of the manuscript.
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El-Daly, S.M., Gamal-Eldeen, A.M., Gouhar, S.A. et al. Modulatory Effect of Indoles on the Expression of miRNAs Regulating G1/S Cell Cycle Phase in Breast Cancer Cells. Appl Biochem Biotechnol 192, 1208–1223 (2020). https://doi.org/10.1007/s12010-020-03378-8
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DOI: https://doi.org/10.1007/s12010-020-03378-8