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Vernodalidimer L, a Sesquiterpene Lactone Dimer from Vernonia Extensa and Anti-Tumor Effects of Vernodalin, Vernolepin, and Vern

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Vernodalidimer L, a Sesquiterpene Lactone Dimer from Vernonia Extensa and Anti-Tumor Effects of Vernodalin, Vernolepin, and Vern Bioorganic Chemistry 92 (2019) 103197 Contents lists available at ScienceDirect Bioorganic Chemistry journal homepage: www.elsevier.com/locate/bioorg Vernodalidimer L, a sesquiterpene lactone dimer from Vernonia extensa and T anti-tumor effects of vernodalin, vernolepin, and vernolide on HepG2 liver cancer cells ⁎ Sanit Thongnesta, , Pornsuda Chawengrumb, Siriporn Keeratichamroenc, ⁎ Kriengsak Lirdprapamongkolc, Chatchakorn Eurtivongb, Jutatip Boonsombata, , Prasat Kittakoopb, Jisnuson Svastic, Somsak Ruchirawata,b,d a Laboratory of Natural Products, Chulabhorn Research Institute, Bangkok 10210, Thailand b Program of Chemical Biology, Chulabhorn Graduate Institute, Chulabhorn Royal Academy, Bangkok 10210, Thailand c Laboratory of Biochemistry, Chulabhorn Research Institute, Bangkok 10210, Thailand d The Center of Excellence on Environmental Health and Toxicology, Commission on Higher Education, Ministry of Education, Bangkok 10400, Thailand ARTICLE INFO ABSTRACT This manuscript honors Professor Dr. HRH Vernonia extensa, known as “Phim Phai Lin” in Thai, is distributed in most regions of Thailand. The plant has Princess Chulabhorn Mahidol on the occasion been used in Ayurveda and traditionally used to treat malaria and cancer, and possesses several sesquiterpene of HRH’s 60th Birthday Anniversary lactones. This study aimed to investigate and identify the active constituents by bioactivity-based analysis, as Celebration. well as to evaluate the cytotoxic activity of V. extensa by MTT or XTT assays in ten cancer cell lines (Liver HepG2 and S102; Bile duct HuCCA-1; Leukemia HL-60 and MOLT-3; Lung A549 and H69AR; Breast MDA-MB-231 and Keywords: T47D; Cervical HeLa). Bioactivity-guided fractionation and semi-preparative HPLC purification were used to Vernonia extensa separate the bioactive constituents. Apoptosis-inducing activity and cell cycle inhibitory effect of selected active Asteraceae Sesquiterpenoids compounds were determined on HepG2 cells by flow cytometric analysis. Bioactivity-guided fractionation ofthe Cytotoxicity CH2Cl2 extract and chemical investigation of the cytotoxic fractions led to the isolation of a new sesquiterpenoid Apoptosis pseudo-dimer named vernodalidimer L, together with eight known sesquiterpenoids from the aerial part of V. extensa. The structures of the isolates were elucidated based on spectroscopic analysis, including 1D and 2D NMR and HRMS. Vernolide has potent broad-spectrum cytotoxicity with IC50 values in the range of 0.91–13.84 μM, against all ten cancer cell lines. The annexin-V flow cytometric analysis showed that vernodalin, vernolepin, and vernolide induced apoptosis on HepG2 cells in a dose dependent manner and these effects correlated with G2/M phase cell cycle arrest. Our results indicated that vernodalin, vernolepin, and vernolide have potential to be used as lead compounds in the development of a therapeutic natural product for treatment of liver cancer. 1. Introduction reported in leaf extract against HepG2, SNU-182, and SNU-449 liver cancer cell lines [8]. The current studies and previous phytochemical The Vernonia genus is characteristically known to contain large research indicated that this plant produces several biologically active amounts of sesquiterpene lactones, with several reported biological sesquiterpene lactones [9–12], and other diverse groups of compounds activities [1–3]. Vernonia extensa (var. amygdalina syn. Gymnanthemum including flavonoids [13,14], steroids [7,15], and triterpenes [16–18]. extensum) with the common name of “Phim Phai Lin1” in Thai, belongs Preliminary bioactivity-guided fractionation experiments carried out in to the family of Asteraceae. This plant is a shrub with a characteristic our group revealed that only the CH2Cl2 aerial part extract (30 μg/mL) odor and a bitter taste, growing up to 5 m in height, and has been possessed strong cytotoxic effect against A549, HuCCA-1, HepG2, and cultivated for medicinal uses, including treatment of diarrhea, skin MOLT-3 cell lines with inhibition values of 89, 91, 96, and 100%, re- wounds, fever, malaria, hepatitis, worm infection, inflammation, viti- spectively. Additionally, the crude extract also expressed a high in- ligo, and cancer [4–7]. In particular, cytotoxicity activity has been hibitory effect on aromatase activity (85% inhibition), which requires ⁎ Corresponding authors. E-mail addresses: [email protected] (S. Thongnest), [email protected] (J. Boonsombat). 1 According to a taxonomic revision for Flora of Thailand, the plant “Phim Phai Lin” is now in the genus of Gymnanthemum. https://doi.org/10.1016/j.bioorg.2019.103197 Received 28 May 2019; Received in revised form 6 August 2019; Accepted 13 August 2019 Available online 16 August 2019 0045-2068/ © 2019 Elsevier Inc. All rights reserved. S. Thongnest, et al. Bioorganic Chemistry 92 (2019) 103197 Fig. 1. Structural compounds (1–9) isolated from V. extensa. further investigations. 2.2. Plant material Presently, we report the isolation of a new elemanolide sesqui- terpene lactone pseudo-dimer named vernodalidimer L (1), together The aerial part of Vernonia extensa (Gymnanthemum extensum) was with eight known compounds from the aerial part CH2Cl2 extract of V. collected in Lak-Si District, Bangkok (coordinates of the site extensa (Fig. 1). Exceptional cytotoxicity of some isolated compounds, 13°52′36.08″N 100°34′28.66″E), in March 2018. The plant was tax- vernodalin, vernodalol, 8-desacylvernodalol, and vernolepin, on A549, onomically identified by Prof. Dr. Wongsatit Chuakul, Department of HeLa, HL-60, and MDA-MB-231 cell lines has already been reported Pharmaceutical Botany, Faculty of Pharmacy, Mahidol University. A [19–21]. However, there has been no report of their cytotoxicity against voucher specimen (GE2018ST) was deposited at the Laboratory of HuCCA-1, HepG2, H69AR, T47-D, S102, HL-60, MOLT-3, and MRC-5 Natural Products, Chulabhorn Research Institute, Bangkok, Thailand. cell lines (data retrieved from SciFinder Scholar, January 2019). The samples were dried under the open-sun and shade to a constant Therefore, we performed the primary screening of the cytotoxic activ- weight and then ground. ities of these compounds in a panel of ten cancer cell lines (A549, H69AR, HuCCA-1, HepG2, S102, HeLa, HL-60, MOLT-3, T47-D, and 2.3. Extraction and isolation MDA-MB-231) and a normal human fibroblast cell line, MRC-5, by using in vitro assays. Described herein are the isolation, structural elu- The dried aerial part of V. extensa (1.3 kg) was extracted succes- cidation, and the cytotoxicity of the isolated compounds. Among them, sively at room temperature with CH2Cl2 (3 × 15 L), CH2Cl2/MeOH vernodalin (2), vernolepin (5), and vernolide (6) were chosen for in- (1:1) mixture (3 × 15 L), and MeOH (3 × 15 L), respectively. The vestigating the mechanism underlying the cytotoxic effects on the solvents were filtrated and evaporated under reduced pressure, yielding HepG2 liver cancer cell line. Furthermore, the effects of the active CH2Cl2 (29.2 g), CH2Cl2/MeOH (5.4 g), and MeOH (50.8 g) extracts. compounds on cell morphology changes, apoptosis, and cell cycle The CH2Cl2 extract (29.2 g) was further separated on silica gel progression of HepG2 cells were analyzed. column chromatography (CC), eluted with a stepwise gradient of hexane-CH2Cl2 (100:0–0:100, v/v) and CH2Cl2-MeOH (100:0 to 0:100), 2. Experimental section to provide four fractions (A–D). The portion of 4.1 g of fraction B was applied to Sephadex LH-20 column chromatography (CC) using CH2Cl2- 2.1. General experimental procedures MeOH (20:80) to give four subfractions (B1–B4). Subfraction B3 (2.5 g) was fractionated on silica gel column, eluting with hexane-EtOAc Optical rotations were determined on a JASCO P-1020 polarimeter. (95:5–0:100, v/v) to obtain four subfractions (B31–B34). Subfraction CD spectra were recorded on a JASCO J-180 CD spectrometer. FTIR B32 (1.4 g) was reapplied to a Sephadex LH-20 CC eluted with 100% spectra were recorded on a PerkinElmer Spectrum One spectrometer MeOH to give five subfractions (B321−B325). Subfraction B324 1 13 using UATR technique. The H and C NMR spectra were measured on (21 mg) was purified by TLC pre-coated plate RP-18, using2 MeCN-H O a Bruker AVANCE 400 and 600 MHz spectrometers in CDCl3 or CD3OD (55:45) to give 2 (6 mg, vernodalin). Subfraction B323 (1.1 g) was with TMS as the internal standard. HPLC purification was performed purified by using semi-preparative HPLC (YMC) with a gradient elution using Waters Delta 600 pumps, equipped with a Waters 2996 photo- (30–100% MeCN in H2O over 60 min, at a flow rate of 10 mL/min, and diode array detector. HRESIMS analyses were recorded on a Bruker UV monitoring at wavelength of 210 nm) to give three subfractions 26 Compact qTOF and Bruker Daltonics MicroTOFLC mass spectrometers. (B3231−3233) and 2 (662.5 mg, 2.3% crude extract, []D + 89.7 (c 2 S. Thongnest, et al. Bioorganic Chemistry 92 (2019) 103197 0.78, CHCl3), vernodalin, tR 17.9 min). Subfractions B3231 (48 mg) was 2.4. Cytotoxicity assay purified by HPLC using a gradient elution (30–100%2 MeCNinH O) to 27 give 4 (2.5 mg, 0.01% crude extract, []D + 28.3 (c 0.24, CHCl3), 8- Cytotoxic activity of tested compounds against human cancer cell 25 desacylvernodalol, tR 7.5 min), 5 (23 mg, 0.08% crude extract, []D + lines, including HL-60 (acute promyelocytic leukemia), MOLT-3 (T-cell 96.4 (c 0.41, CHCl3), vernolepin, tR 10.9 min.), subfraction B3232 acute lymphoblastic leukemia), A-549 (lung adenocarcinoma), HeLa (44 mg) yielded 3 (15.4 mg, 0.05% crude extract, + 126.1 (c 0.17, (cervical carcinoma), HuCCA-1 (cholangiocarcinoma derived from a CHCl3), vernodalol, tR 11.9 min), and subfraction B3233 (44 mg) Thai patient), S102 (hepatocellular carcinoma derived from a Thai yielded 6 (27 mg, 0.09% crude extract, = + 222.5 (c 1.34, CHCl3), patient), HepG2 (hepatocellular carcinoma), MDA-MB-231 (triple-ne- vernolide, tR 19.9 min), respectively. Subfraction B3234 (20 mg) was gative breast cancer), T-47D (hormone-dependent breast carcinoma), further purified by HPLC (YMC) using an isocratic elution (30% MeCN H69AR (multidrug-resistant small-cell lung carcinoma), and MRC-5 in H2O over 60 min, flow rate of 10 mL/min, and UV monitoring at (normal embryonic lung fibroblast).
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