Cytotoxic activities of phytochemicals from Ferula species
© Valiahdi et al.; licensee BioMed Central Ltd. 2013
Received: 8 April 2013
Accepted: 11 May 2013
Published: 23 May 2013
Ferula species are reputed in folk medicine for the treatment of a variety of disorders. There have been sporadic reports on the chemopreventive and chemosensitizing activities of some terpenoid coumarin derivatives from the genus Ferula. The present study investigated the cytotoxic activity of 11 phytochemicals (conferone, farnesiferol A, acantrifoside E, mogoltadone, diversin, galbanic acid, herniarin, 7-isopentenyloxycoumarin, umbelliprenin, stylosin and tschimgine) from Ferula species together with a newly synthesized prenylated derivative of curcumin (gercumin II).
Cytotoxic activity of phytochemicals was evaluated against ovarian carcinoma (CH1), lung cancer (A549) and melanoma (SK-MEL-28) cell lines using MTT assay.
Results and conclusion
Overall, moderate cytotoxic activity was observed from the tested compounds with IC50 values in the micromolar range. The highest activity against CH1 and A549 lines was from conferone while stylosin and tschimgine were the most potent compounds against SK-MEL-28 line. In conclusion, the findings of the present investigation did not support a potent cytotoxic activity of the tested phytochemicals against CH1, A549 and SK-MEL-28 cell lines. With respect to previous reports, the beneficial impact of these phytochemicals in cancer therapy may be more attributable to their chemopreventive or chemosensitizing activity rather than direct cytotoxic effects.
KeywordsCancer Cytotoxicity Phytochemical Ferula
During recent decades, there has been an increasing demand for finding newer and safer chemotherapeutic agents. Natural products, in particular plants, have long been used for their medicinal properties in several traditional systems of medicine. Over 60% of current cytotoxic agents have been derived from natural sources including plants, marine organisms and microorganisms, either directly or by chemical synthesis based on natural lead compounds [1, 2]. Therefore, natural products have a wide application in cancer chemotherapy .
Genus Ferula (Apiaceae) comprises about 170 species, of which 30 have been included in Iranian flora and some are endemic. Plants belonging to this genus are distributed throughout central Asia, Mediterranean region and Northern Africa, and are well reputed in traditional medicine for the treatment of a variety of disorders . To date, more than 70 Ferula species have been subjected to phytochemical analysis, and findings have led to the identification of this genus as a good source of bioactive compounds including terpenoid derivatives [4–7]. In the present work, we sought to determine the cytotoxic activity of phytochemicals isolated from Ferula species, and also a novel synthetic derivative of curcumin, against tumor cell lines originating from melanoma, ovarian and lung carcinoma.
Materials and methods
Monoterpene esters, stylosin and tschimgine, were isolated from F. ovina root extract. In brief, powdered roots of F. ovina (500 g) were extracted by dichloromethane (3 L) using maceration method (36 h), yielding a residue (93 g). Part of the extract (21 g) was subjected to column chromatography on silica gel (5 × 60 cm) using petroleum ether/ethyl acetate (20/1) as an initial solvent with gradual increasing of solvent polarity up to 100% ethyl acetate. Stylosin (706 mg; mp: 160-162°C) and tschimgine (1691 mg; mp: 158-159°C) were obtained as pure solid crystals from the column and their structures were confirmed by comparison of 1H- and 13C-NMR spectra as well as melting point value with those of a previous report  (Additional files 4, 5, 6, 7 and 8).
Galbanic acid (Additional file 9), farnesiferol A (Additional file 10), diversin (Additional file 11), conferone (Additional file 12), acantrifoside E (Additional files 13, 14 and 15) and mogoltadone (Additional file 16) were isolated from the roots of F. szowitsiana, F. persica, F. diversivittata, F. flabelliloba, F. gummosa and F. persica, respectively.
For the synthesis of gercumin II, curcumin (2 mmol ~ 736 mg) was dissolved in acetone (50 cc) and reacted with geranyl bromide (2 mmol ~ 400 μL) in the presence of DBU (2 mmol ~ 300 μL). Then, the mixture was refluxed for 150 minutes at 37°C. After the reaction was completed (confirmed by TLC), the products were isolated by decantation of the reaction mixture with distilled water (75 cc) and ethyl acetate (75 cc). After separation and solvent evaporation of the organic phase, the products were purified by Silica Gel column chromatography with petroleum ether/acetone/methanol (5/1/0.1 v/v) system as eluent. The fractions (80 mL each) were compared by TLC [petroleum ether/acetone/methanol (2.5/1/0.1 v/v)], and those giving similar spots were combined, solvent evaporated and crystallized. Gercumin II was obtained as yellow crystals (mp: 62-64 C; yield: 38%). The chemical structure of gercumin II was confirmed by 1H- and 13C-NMR experiments (Additional file 17).
Cell lines and culture conditions
CH1 (ovarian carcinoma, human) cells were donated by Lloyd R. Kelland (CRC Centre for Cancer Therapeutics, Institute of Cancer Research, Sutton, UK). A549 (non-small cell lung cancer, human) and SK-MEL-28 (malignant melanoma, human) cells were kindly provided by Brigitte Marian (Institute of Cancer Research, Department of Medicine I, Medical University of Vienna, Austria) and Christoph Hoeller (Dermatology Clinic, Medical University of Vienna, Austria). Cells were grown in 75 cm2 culture flasks (Iwaki/Asahi Technoglass) as adherent monolayer cultures in Minimal Essential Medium (MEM) supplemented with 10% heat-inactivated fetal bovine serum, 1 mM sodium pyruvate, and 2 mM L-glutamine (all purchased from Sigma-Aldrich) without antibiotics. Cultures were maintained at 37°C in a humidified atmosphere containing 5% CO2 and 95% air.
Cytotoxic activity tests in cancer cell lines
Cytotoxic activity in the cell lines mentioned above was determined by the colorimetric MTT assay (MTT = 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide, purchased from Fluka). Cells were harvested from culture flasks by trypsinization and seeded in 100 μL aliquots in MEM supplemented with 10% heat-inactivated fetal bovine serum, 1 mM sodium pyruvate, 2 mML-glutamine, and 1% non-essential amino acids (100x) into 96-well microculture plates (Iwaki/Asahi Technoglass). Cell densities per well were adjusted to 1.5 × 103 (CH1), 4.0 × 103 (A549), and 4.0 × 103 (SK-MEL-28), to ensure exponential growth of untreated cells. Cells were allowed to settle and resume exponential growth in drug-free complete culture medium for 24 h, followed by addition of dilutions of the test compounds in 100 μL/well of the same medium. Test compounds were used from fresh stock solutions in dimethylsulfoxide (DMSO) and diluted in media or buffer as appropriate to a maximum of 0.3% DMSO. After continuous exposure for 96 h, the medium was replaced by 100 μL/well RPMI 1640 medium (supplemented with 10% heat-inactivated fetal bovine serum and 4 mML-glutamine) plus 20 μL/well solution of MTT in phosphate-buffered saline (5 mg/mL) (all purchased from Sigma-Aldrich). After incubation for 4 h, medium/MTT mixtures were removed, and the formazan product formed by viable cells was dissolved in DMSO (150 μL/well). Optical densities were measured at 550 nm with a microplate reader (Tecan Spectra Classic), using a reference wavelength of 690 nm to correct for non-specific absorption. The quantity of viable cells was expressed as percentage of untreated controls, and 50% inhibitory concentrations (IC50) were calculated from concentration-effect curves by interpolation. Evaluation was based on means from three independent experiments, each comprising six replicates per concentration level.
Results and discussion
Cytotoxicity of tested phytochemicals on three human cancer cell lines
38.8 ± 7.0
63.8 ± 30.0
7.79 ± 3.49
53.7 ± 5.1
213 ± 17
25.7 ± 1.2
79.0 ± 5.9
44.3 ± 5.4
24.1 ± 4.3
89.1 ± 4.4
76.1 ± 5.4
46.3 ± 2.8
86.0 ± 18.2
159 ± 29
21.0 ± 3.1
46.6 ± 1.8
44.6 ± 0.7
38.4 ± 0.8
133 ± 6
58.1 ± 15.2
37.2 ± 2.7
1.3 ± 0.3
2.2 ± 0.05
0.2 ± 0.03
To our knowledge, data regarding cytotoxic activity of the compounds tested herein have been very few and for some of them lacking. All tested compounds displayed cytotoxic activity against the tumor cell lines. However, the obtained IC50 values for all evaluated compounds were markedly higher than that of the reference standard, cisplatin. In addition, no obvious structure-activity relationship was found for the tested compounds. Overall, conferone exhibited the highest activity among the tested compounds against A549 and CH1 cell lines. In previous investigations, Barthomeuf and colleagues demonstrated that conferone enhances the cytotoxic activity of vinblastine in MDCK-MDR1 cells. This activity was shown to be due to the potent inhibition of P-glycoprotein by this phytochemical and consequent reversal of multidrug resistance . The same effect of conferone has also been reported for vincristine against 5637 cell line . However, in both of these studies, treatment of cell lines with conferone alone did not result in any considerable cytotoxic activity. As for the SK-MEL-28 cell line, the highest activity was observed from stylosin and tschimgine. Previous investigations regarding the cytotoxic properties of these phytochemicals have been very scant. Findings of two previous studies have implied the anti-tumor activity of stylosin and tschimgine against 5637 and MCF-7 cell lines, respectively [17, 18]. The cytotoxic activities of these monoterpenes could be attributed, at least in part, to their phytoestrogenic properties as phytoestrogens have been postulated to possess cytotoxic effects [19, 20]. As for the umbelliprenin, previous investigations have shown that this phytochemical possesses in vitro and in vivo chemopreventive as well as in vitro anti-tumor properties [21–23]. The anti-tumor activity of this agent has been documented to be mediated through cell cycle arrest at G1 phase and induction of caspase-dependent apoptosis . Moreover, umbelliprenin has been reported to inhibit matrix metalloproteinases and therefore might be effective against tumor invasion, metastasis and angiogenesis . Nevertheless, it appears that direct cytotoxic activity of umbelliprenin varies based on the specificity of this phytochemical for different cell lines. Whilst the effects of umbelliprenin was found to be superior to cisplatin in M4Beu cells, no such an effect was found in other cell lines including DLD1, MCF7, PA1, PC3 and A549 . Galbanic acid has also been reported to inhibit VEGF-induced proliferation, migration and angiogenesis, thereby possessing anti-tumor activity . Finally, a recent report by Hanafi-Bojd et al. has indicated the inhibitory activity of galbanic acid and farnesiferol A against P-glycoprotein, thereby posing their potential efficacy in the treatment of multidrug resistant tumors . In accordance with our findings, a recent study by Iranshahi et al. did not found any significant activity of isolated sesquiterpene coumarins from F. gummosa against M14, MCF-7, T98G, A549, Saos-2, FRO, and U937 cell lines. The only exception was the cytotoxic effect of feselol against the U937 cell line . Another miscellaneous compound that was investigated in the present study was gercumin II, a novel synthetic derivative of curcumin. There has been a great deal of previous work indicating the anti-carcinogenic and chemopreventive activity of curcumin against a wide variety of cancers [27–34]. It appears that the cytotoxic activity of curcumin is mediated by multiple mechanisms including anti-inflammatory, free radical scavenging, anti-genotoxic, anti-angiogenic and anti-metastatic properties . Gercumin II is a synthetic germacryl derivative of curcumin which has 10 C prenyl moieties substituted on the phenolic hydroxyl groups of curcumin. However, this prenylation was not found to enhance the cytotoxic activity of curcumin as gercumin II was almost inactive against all tested cell lines. Nevertheless, the impact of curcumin prenylation on other related biological activities of curcumin such as chemopreventive, chemomodulatory and anti-angiogenic activities remain to be explored.
In summary, the findings of the present investigation did not support a potent cytotoxic activity of the tested phytochemicals against CH1, A549 and SK-MEL-28 cell lines. Lack of remarkable anti-tumor activity of the tested compounds in the present study, which is in contrast with some previous findings, might be attributed to the possible differential effects of these phytochemicals against different cell lines. Besides, since antioxidants have a dual role in fighting cancer , it remains to be determined if the antioxidant properties (in terms of altering intracellular content of reactive oxygen species) of compounds tested in this study differ among cancerous cell lines, and also there is any association between the observed cytotoxic properties and degree of antioxidant activity for each compound. Another issue that merits further investigation is the potential cytotoxic properties of crude Ferula extracts as these extracts are known to possess antioxidant properties which is mainly due to their phenolic constituents . Finally, it appears that the tested agents might be more effective in term of cancer therapy as chemopreventive or chemosensitizers, as previously shown for some.
NMR spectral data of tested compounds are available as supporting information.
The authors gratefully acknowledge the financial support for this work that was provided by the Institute of Inorganic Chemistry, University of Vienna, Vienna, Austria.
Seied Mojtaba Valiahdi and Mehrdad Iranshahi contributed equally to this work and ordering was determined arbitrarily.
- Newman DJ, Cragg GM, Snader KM: Natural products as sources of new drugs over the period 1981–2002. J Nat Prod. 2003, 66: 1022-1037. 10.1021/np030096l.View ArticlePubMedGoogle Scholar
- Cragg GM, Kingston DGI, Newman DJ: Anticancer Agents from Natural Products. 2005, Boca Raton, FL: CRC PressGoogle Scholar
- Pimenov MG, Leonov MV: The genera of the Umbelliferae. 1993, Kew, UK: Royal Botanic GardensGoogle Scholar
- Tamemoto K, Takais Y, Chen B, Kawazoe K, Shibata H, Higuti T, Honda G, Ito M, Takeda Y, Kodzhimatov OK, Ashurmetov O: Sesquiterpenoids from the fruits of Ferula kuhistanica and antibacterial activity of the constituents of F. kuhistanica. Phytochemistry. 2001, 58: 763-767. 10.1016/S0031-9422(01)00307-7.View ArticlePubMedGoogle Scholar
- Motai T, Daikonya A, Kitanaka S: Sesquiterpene Coumarins from Ferula fukanensis and Nitric Oxide Production Inhibitory Effects. J Nat Prod. 2004, 67: 432-436. 10.1021/np030408k.View ArticlePubMedGoogle Scholar
- Iranshahi M, Arfa P, Ramezani M, Jaafari MR, Sadeghian H, Bassarello C, Piacente S, Pizza C: Sesquiterpene coumarins from Ferula szowitsiana and in vitro antileishmanial activity of 7-prenyloxycoumarins against promastigotes. Phytochemistry. 2007, 68: 554-561. 10.1016/j.phytochem.2006.11.002.View ArticlePubMedGoogle Scholar
- Iranshahi M, Rezaee R, Sahebkar A, Bassarello C, Piacente S, Pizza C: Sesquiterpene coumarins from the fruits of Ferula badrakema. Pharm Biol. 2009, 47: 344-347. 10.1080/13880200902752884.View ArticleGoogle Scholar
- Askari M, Sahebkar A, Iranshahi M: Synthesis and purification of 7- prenyloxycoumarins and herniarin as bioactive natural coumarins. Iran J Basic Med Sci. 2009, 12: 63-69.Google Scholar
- Iranshahi M, Famili A, Bassarello C, Piacente S, Pizza C: Purification and structure elucidation of compounds from the roots of Ferula ovina Boiss. Journal of Medicinal Plants. 2010, 9: 72-80.Google Scholar
- Iranshahi M, Amin G, Shafiee A: A new coumarin from Ferula persica. Pharm Biol. 2004, 42: 440-442. 10.1080/13880200490886102.View ArticleGoogle Scholar
- Iranshahi M, Hosseini ST, Shahverdi AR, Molazade K, Khan SS, Ahmad VU: Diversolides A-G, guaianolides from the roots of Ferula diversivittata. Phytochemistry. 2008, 69: 2753-2757. 10.1016/j.phytochem.2008.08.009.View ArticlePubMedGoogle Scholar
- Iranshahi M, Kalategi F, Sahebkar A, Sardashti A, Schneider B: New sesquiterpene coumarins from the roots of Ferula flabelliloba. Pharm Biol. 2010, 48: 217-220. 10.3109/13880200903019226.View ArticlePubMedGoogle Scholar
- Iranshahi M, Masullo M, Asili A, Hamedzadeh A, Jahanbin B, Festa M, Capasso A, Piacente S: Sesquiterpene coumarins from Ferula gumosa. J Nat Prod. 2010, 73: 1958-1962. 10.1021/np100487j.View ArticlePubMedGoogle Scholar
- Iranshahi M, Mojarab M, Sadeghian H, Hanafi-Bojd MY, Schneider B: Polar secondary metabolites of Ferula persica roots. Phytochemistry. 2008, 69: 473-478. 10.1016/j.phytochem.2007.08.001.View ArticlePubMedGoogle Scholar
- Barthomeuf C, Demeule M, Grassi J, Saidkhodjaev A, Beliveau R: Conferone from Ferula schtschurowskiana enhances vinblastine cytotoxicity in MDCK-MDR1 cells by competitively inhibiting P-glycoprotein transport. Planta Med. 2006, 72: 634-639. 10.1055/s-2006-931574.View ArticlePubMedGoogle Scholar
- Neshati V, Matin MM, Iranshahi M, Bahrami AR, Behravan J, Mollazadeh S, Rassouli FB: Cytotoxicity of vincristine on the 5637 cell line is enhanced by combination with conferone. Z Naturforsch. 2009, C 64: 317-322.Google Scholar
- Rassouli FB, Matin MM, Iranshahi M, Bahrami AR: Investigating the cytotoxic and apoptosis inducing effects of monoterpenoid stylosin in vitro. Fitoterapia. 2011, 82: 742-749. 10.1016/j.fitote.2011.03.005.View ArticlePubMedGoogle Scholar
- Rounaghi F, Moghaddam Matin M, Bahrami AR, Iranshahi M: 12th Iranian Pharmaceutical Sciences Congress. Investigating the anti-cancer effects of tschimgine on MCF-7 cells in vitro. 2010, Available at: http://profdoc.um.ac.ir/articles/a/1019668.pdfGoogle Scholar
- Barnes S: Phytoestrogens and breast cancer. Baillieres. Clin Endocrinol Metab. 1998, 12: 559-579.Google Scholar
- Adlercreutz H: Phyto-oestrogens and cancer. Lancet Oncol. 2002, 3: 364-373. 10.1016/S1470-2045(02)00777-5.View ArticlePubMedGoogle Scholar
- Barthomeuf C, Lim S, Iranshahi M, Chollet P: Umbelliprenin from Ferula szowitsiana inhibits the growth of human M4Beu metastatic pigmented melanoma cells through cell-cycle arrest in G1 and induction of caspasedependent apoptosis. Phytomedicine. 2008, 15: 103-111. 10.1016/j.phymed.2007.04.001.View ArticlePubMedGoogle Scholar
- Iranshahi M, Kalategi F, Rezaee R, Shahverdi AR, Ito C, Furukawa H, Tokuda H, Itoigawa M: Cancer chemopreventive activity of terpenoid coumarins from Ferula species. Planta Med. 2008, 74: 147-150. 10.1055/s-2008-1034293.View ArticlePubMedGoogle Scholar
- Iranshahi M, Sahebkar A, Takasaki M, Konoshima T, Tokuda H: Cancer chemopreventive activity of the prenylated coumarin, umbelliprenin, in vivo. Eur J Cancer Prev. 2009, 18: 412-415. 10.1097/CEJ.0b013e32832c389e.View ArticlePubMedGoogle Scholar
- Shahverdi AR, Saadat F, Khorramizadeh MR, Iranshahi M, Khoshayand MR: Two matrix metalloproteinases inhibitors from Ferula persica var. persica. Phytomedicine. 2006, 13: 712-717. 10.1016/j.phymed.2006.01.003.View ArticlePubMedGoogle Scholar
- Kim KH, Lee HJ, Jeong SJ, Lee HJ, Lee EO, Kim HS, Zhang Y, Ryu SY, Lee MH, Lü J, Kim SH: Galbanic acid isolated from Ferula assafoetida exerts in vivo anti-tumor activity in association with anti-angiogenesis and anti-proliferation. Pharm Res. 2011, 28: 597-609. 10.1007/s11095-010-0311-7.View ArticlePubMedGoogle Scholar
- Hanafi-Bojd MY, Iranshahi M, Mosaffa F, Tehrani SO, Kalalinia F, Behravan J: Farnesiferol A from Ferula persica and Galbanic Acid from Ferula szowitsiana Inhibit P-Glycoprotein-Mediated Rhodamine Efflux in Breast Cancer Cell Lines. Planta Med. 2011, 77: 1590-1593. 10.1055/s-0030-1270987.View ArticlePubMedGoogle Scholar
- Hanif R, Qiao L, Schiff SJ, Rigas B: Curcumin, a natural plant phenolic food additive, inhibits cell proliferation and induces cell cycle changes in colon adenocarcinoma cell lines by a prostaglandin-independent pathway. J Lab Clin Med. 1997, 130: 576-584. 10.1016/S0022-2143(97)90107-4.View ArticlePubMedGoogle Scholar
- Mehta K, Pantazis P, McQueen T, Aggarwal BB: Antiproliferative effect of curcumin (diferuloylmethane) against human breast tumor cell lines. Anticancer Drugs. 1997, 8: 470-481. 10.1097/00001813-199706000-00010.View ArticlePubMedGoogle Scholar
- Elattar TM, Virji AS: The inhibitory effect of curcumin, genistein, quercetin and cisplatin on the growth of oral cancer cells in-vitro. Anticancer Res. 2000, 20: 1733-1738.PubMedGoogle Scholar
- Siwak DR, Shishodia S, Aggarwal BB, Kuzrock R: Curcumin-induced antiproliferative and proapoptotic effects in melanoma cells are associated with suppression of IkappaB kinase and nuclear factor kappaB activity and are independent of the B-Raf/mitogen-activated/extracellular signal-regulated protein kinase pathway and the Akt pathway. Cancer. 2005, 104: 879-890. 10.1002/cncr.21216.View ArticlePubMedGoogle Scholar
- Lin YG, Kunnumakkara AB, Nair A, Merritt WM, Han LY, Armaiz-Pena GN, Kamat AA, Spannuth WA, Gershenson DM, Lutgendorf SK, Aggarwal BB, Sood AK: Curcumin inhibits tumor growth and angiogenesis in ovarian carcinoma by targeting the nuclear factor-kappaB pathway. Clin Cancer Res. 2007, 13: 3423-3430. 10.1158/1078-0432.CCR-06-3072.View ArticlePubMedGoogle Scholar
- Basnet P, Skalko-Basnet N: Curcumin: An anti-inflammatory molecule from a curry spice on the path to cancer treatment. Molecules. 2011, 16: 4567-4598. 10.3390/molecules16064567.View ArticlePubMedGoogle Scholar
- Wilken R, Veena MS, Wang MB, Srivatsan ES: Curcumin: A review of anti-cancer properties and therapeutic activity in head and neck squamous cell carcinoma. Mol Cancer. 2011, 10: 12. 10.1186/1476-4598-10-12.PubMed CentralView ArticlePubMedGoogle Scholar
- Mukhopadhyay A, Bueso-Ramos C, Chatterjee D, Pantazis P, Aggarwal BB: Curcumin downregulates cell survival mechanisms in human prostate cancer cell lines. Oncogene. 2001, 20: 7597-7609. 10.1038/sj.onc.1204997.View ArticlePubMedGoogle Scholar
- Abdollahi M, Soodabeh S: Who plays dual role in cancerous and normal cells? natural antioxidants or free radicals or the cell environment. Int J Pharmacol. 2012, 8: 711-712. 10.3923/ijp.2012.711.712.View ArticleGoogle Scholar
- Dehghan G, Shafiee A, Ghahremani MH, Ardestani SK, Abdollahi M: Antioxidant potential of various extracts from Ferula szovitsiana in relation to their phenolic content. Pharm Biol. 2007, 45: 691-699. 10.1080/13880200701575098.View ArticleGoogle Scholar
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.