Abstract
Recently, we have isolated and identified several bioactive flavonoids and stilbenoids with potential anticancer activity from Thai orchids. In this study, we further investigated the cytotoxic and chemosensitizing activities of these phytochemicals (namely, pinocembrin, cardamonin, isalpinin, galangin, pinosylvin monomethyl ether, 2,3′-dihydroxy-5′-methoxystilbene, (E)-2,5′-dihydroxy-2′-(4-hydroxybenzyl)-3′-methoxystilbene, 2,3-dihydroxy-3′,5′-dimethoxystilbene, 2,3′-dihydroxy-5,5′-dimethoxystilbene, 3,4′-dihydroxy-5-methoxystilbene and batatasin III) against breast cancer MCF7 cells and its two multidrug resistant (MDR) sublines (MCF7/DOX and MCF7/MX). Cytotoxicity was determined with MTT assay for the estimation of the half maximal cytotoxic concentrations (IC50). Effects of the test compounds on activities of efflux transporters (BCRP, P-gp, MRP1, and MRP2) were evaluated with substrate accumulation assays using fluorometry and flow cytometry analysis. Out of these 11 test compounds, the stilbene pinosylvin monomethyl ether displayed its cytotoxicity specifically toward MCF7 cells (IC50 = 6.2 ± 1.2 μM, 72-h incubation) with 4.96 folds higher than normal fibroblast. Its potency decreased in MCF7/DOX and MCF7/MX cells by 3.94 and 7.38 folds, respectively. Our transporter assay indicated that this stilbene significantly reduced the activities of P-gp, MRP1, and MRP2, but not BCRP. After 48-h co-incubation, this stilbene (at 2 μM) synergistically increased doxorubicin- and mitoxantrone-mediated cytotoxicity in MCF7, MCF7/DOX, and MCF7/MX cells potentially by increasing the intracellular level of cytotoxic drug. Pinosylvin monomethyl ether could sensitize breast cancer cells to chemotherapy and overcome MDR, in part, via the inhibition of drug efflux transporters.
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Funding
This work was supported by a grant (Fundamental Fund No. CUFRB65 hea(53)-062–33-06) from Thailand Science Research and Innovation (TSRI), Thailand. We also received graduate scholarship from Chulalongkorn University for ASEAN and Non-ASEAN countries to KL Sein.
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Khin Lay Sein and Suree Jianmongkol conceived and designed research. Khin Lay Sein conducted experiments. Khin Lay Sein and Suree Jianmongkol conducted data analysis and interpretation. Nonthalert Lertnitikul and Rutt Suttisri contributed the test materials. Khin Lay Sein wrote the original draft of manuscript. Rutt Suttisri and Suree Jianmongkol reviewed and edited the final draft of manuscript. All authors read and approved the manuscript.
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Sein, K.L., Lertnitikul, N., Suttisri, R. et al. Anticancer and chemosensitizing activities of stilbenoids from three orchid species. Naunyn-Schmiedeberg's Arch Pharmacol 396, 749–758 (2023). https://doi.org/10.1007/s00210-022-02352-x
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DOI: https://doi.org/10.1007/s00210-022-02352-x