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Anti-cancer activity of Moringa oleifera Lam. seed oil on oral cancer

Abstract

Background

Despite recent advances in the diagnosis and treatment of oral cancer, relative survival rates have not changed significantly. Moringa oleifera (M. oleifera) Lam. is one such plant with its anticancer properties being proved in its leaves, stem, flowers but no studies are yet reported proving the anticancer property of its seed oil on oral cancer. This study aimed to evaluate the anti-proliferative and cytotoxic effect of M. oleifera seed oil against two Oral squamous cell carcinoma cell lines CAL27 and SCC15 using MTT assay.

Results

2D GC-TOF Mass spectrometry revealed a total of 199 compounds, among which the majority were alkanes (68.2016%) and fatty acid esters (11.1399%). The MTT assay report showed good dose-dependent activity. A significant reduction in cell viability within 24 h with IC50 value of 17.78 µg/mL and 24.28 µg/mL for all treatment groups was observed for both the cell lines CAL27 and SCC15.

Conclusion

MTT assay showed a significant decrease in cell viability with an increase in the oil dose, thereby revealing the cytotoxic and anti-proliferative activity of M. oleifera seed oil on oral cancer cell lines namely CAL27and SCC15. The results of this study indicate that M. oleifera seed oil can be used as a potent anti-cancer agent in the treatment of Oral cancer.

Graphical abstract

1 Background

The number of oral cancer cases in India is the highest worldwide and accounts for one-third of the total burden of the disease. Approximately one-fourth of all global incidences are reported in India, with 77,000 new cases and 52,000 deaths a year [1]. As a result of the disease's high prevalence, treating it has been a long and challenging endeavor. Systematic cancer therapy includes surgical removal, radiation, and chemotherapy [2]. The commonly used chemotherapeutic agents are DNA-interactive agents (e.g., doxorubicin, cisplatin,) anti-metabolites (e.g., methotrexate), molecular targeting agents, anti-tubulin agents (taxanes), and hormones. On the other hand, various disadvantages have been noticed with cancer therapy, like drug resistance, toxicity on normal body cells, and recurrence of cancer. There is a need for a better anti-cancer agent with fewer side effects to overcome the limitations of current cancer therapies [3].

Several ancient plant species are used in traditional medicine. Herbs like ginger, curcumin, saffron, and cinnamon have anti-cancer efficacy against OSCC cell lines [4]. Moringa oleifera (M. oleifera) is one such miracle plant, as it is rich in vitamins, proteins, carbohydrates, fatty acids, fibers, trace elements, and phytochemical compounds [5]. Various biological activities have already been studied, including the anti-cancer activity of leaves, fruits, flowers, bark, and roots of M. oleifera [6].

The anti-cancer activity of M. oleifera is accredited to niazimicin, Quercetin, niazinin, glycerol-1(9-octadecanote, (A-L-rhamnosyloxy) benzyl) carbamate [7]. Moringa oleifera exhibited an anti-proliferative effect on Hep-2 cells by initiating apoptosis by upregulating caspase 3 apoptotic marker [8]. Abd-Rabou et al. [9]. observed that M. oleifera seed oil induced apoptosis in colorectal cancer cells Caco-2 and HCT116 without affecting normal cells. Anti-cancer potency of M. oleifera leaf extract was found to regulate Caspase3, VEGF, HSF1 expression in mice induced with oral squamous cell carcinoma [10,11,12]. In this study, we aim to examine the anti-proliferation and cell cytotoxicity by MTT assay against SCC 15 and CAL 27 oral squamous cell carcinoma cell lines. To our knowledge, this study is the first of its kind.

2 Methods

2.1 Plant material collection

Fresh matured pods of M. oleifera were obtained from Keonjhar district of Odisha. The collected pods were cleansed 2–3 times with distilled water and shade dried. The seeds kernels were separated and ground into coarse powder.

2.2 Oil extraction and phytochemical analysis

Oil was extracted using Soxhlet apparatus (BOROSIL, India) at 30 °C. 100 g of powdered sample was taken in the thimble with 500 mL of ethanol (solvent). The extraction process continued for 8 h. The oil dissolved in ethanol was collected and evaporated using water bath. The extracted oil was then collected in sterile container and stored in 4 °C. The component identification was achieved by GCGC-TOF–MS analysis (Leco, Regasus 4D) with Agilent 7890B GC, and the compounds were identified from the NIST library following standardized methods.

2.3 Cell line culture

SCC 15 and CAL 27 human tongue squamous cell carcinoma cell lines were procured from American Type Culture Collection (ATCC). Cells were cultured in Dulbecco’s modified Eagle’s medium (DMEM) (AL007 HiMedia) and supplemented with Fetal Bovine Serum (FBS) 10% (L1006 HiMedia). Cells were incubated at 37 °C in CO2 incubator (Healforce, China) in CO as 5% and humidity atmosphere as 95% [13].

2.4 Cell viability assay (MTT assay)

Cytotoxic and anti-proliferation activity of M.oleifera seed oil was determined by MTT assay. The assay control included medium control (only medium), negative control (cells and medium) and a positive control (medium with Cisplatin − 5 mg and cells). SCC15 and CAL 27 cells were seeded into 96-well microtiter plate (Corning, USA) at cell density 20,000 cells per/200 μl DMEM medium without the test compounds and incubated overnight. Test agents were incubated in cell culture medium without addition of fetal bovine serum (RM10432, HiMedia) at 37 °C for 24 h (since the test samples were insoluble in nature). This made the test materials’ constituents to release into the medium, which was further used for cytotoxicity assay and cell proliferation assay. After removal of the spent medium from 96 well microtiter plate, the cells were left for incubation with serum free medium for 3 h. After serum starvation, the five concentrations of test samples were added as 31.25, 62.5, 125, 250, 500 µg/mL and incubated for 24 h at 37 °C in a 5% CO2 0.5 mg/mL of MTT reagent (4060 HiMedia) was added to the spent media after removing the spent media. The plate was then wrapped with aluminum foil and left for 3 h of incubation. After removal of MTT reagent, 100 μL of DMSO (solution for solubilisation) was added and dissolved properly until MTT formazan crystals appeared. The absorbance was recorded on a spectrophotometer at 570 nm as reference wavelength.

2.5 Statistical analysis

All data were analyzed using Minitab version 17 software. The data were presented in mean and Standard deviation. The significant difference was evaluated using regression analysis. A linear regression equation was used to determine the half maximal inhibitory concentration IC50 from the linear part of sigmoid curve in order to analyze cell viability, i.e. \(y=mx+c\), y = 50, M and C values were derived from the viability graph. R2 values ≥ 0.95 were considered to be statistically significant.

3 Results

3.1 GC × GC-TOF–MS analysis of M. oleifera seed

Light brown color oil was obtained from 100 g of dried seeds of M. oleifera with 28% of total oil yield. The oil was analyzed using two dimension gas chromatography time of flight mass spectrometry and chemical profiles were identified using NIST libraries and subsequently grouped under chemical classes with reference to PubChem and Human metabolome database (Fig. 1).

Fig. 1
figure 1

a Contour plot of 2D GC-TOF–MS showing the peaks of major phytochemicals; b 3 dimensional plot representing major compounds

The identified compounds were segregated into classes namely—Alkanes, Alkene, Aldehyde, Amine, Acid esters, Fatty acids, Alcohols, Carbohydrates, Terpenoids, Ketones, Esters and others (Table attached as Additional file 1). A total of 199 compounds constituting total area of 94.7298% among which majority were alkanes (68.2016%) and fatty acid esters (11.1399%). The complete list of all 199 phytochemicals is present in Additional file 1. The peaks in the 3D plot and contour plot represent the major phytochemicals with more concentration (Table 1).

Table 1 Major constituents identified from seed oil of M. oleifera by GC × GC TOF–MS analysis

3.2 Cellular toxicity of M. oleifera seed oil on CAL27 and SCC15 cells

Treatment with M. oleifera seed oil showed decrease in the cell viability with IC50 value is 17.78 µg/mL on CAL27 and 24.28 µg/mL on SCC15 cell line. Data illustrated in (Figs. 2, 3) show the percentage viabilities of both the cell lines after 24 h incubation with treatment versus controls. Figure 2 represents the regression graph for calculation of IC50 value, and the column graph represents the decrease in viability percentage with increase in concentration of the oil in comparison to the standard (Cisplatin). Figure 3 represents the microscopic images of both the cell lines showing decrease in cancer cells with increase in dose of the oil. 31.25 µg/mL of oil showed the minimum cytotoxicity and 500 µg/mL of oil showed maximum cytotoxicity on both the cell lines (Table 2).

Fig. 2
figure 2

Graphical representation showing cytotoxic effect of M. oleifera seed oil. a and b Cytotoxic effect of M. oleifera against cisplatin on SCC15 is represented by linear decrease in cell viability along with increase in concentration; c and d cytotoxic effect of M. oleifera against cisplatin on CAL 27 is represented by linear decrease in cell viability along with increase in concentration

Fig. 3
figure 3

(1) SCC 15 cell control (2) 5 mg cisplatin as standard (positive control) (3–5) SCC 15 cell toxicity activity in M. oleifera seed oil at concentration of 31.25, 250 and 500 ug/mL of test sample after 24 h incubation (6) CAL 27cell control (7) 5 mg cisplatin as standard (positive control) (8–10) CAL 27 cell toxicity activity in M. oleifera seed oil at concentration of 31.25, 250 and 500 ug/mL of test sample after 24 h incubation

Table 2 Percentage viability of SCC 15 and CAL 27 cells against M. oleifera seed oil showing its cytotoxic effect

3.3 Effect of M. oleifera seed oil on proliferation of CAL27 and SCC15 cell lines

The results of cell proliferation assay exhibited remarkable difference between the control groups and M. oleifera seed oil. A gradual and significant decrease in the cell viability was observed after 24 h incubation in both the cell lines when treated with M. oleifera seed oil in dose-dependent manner (Figs. 4, 5). Figure 4 represents the regression graph for calculation of IC50 value and the column graph represents the decrease in viability percentage with increase in concentration of the oil in comparison to the standard (Cisplatin). Figure 5 represents the microscopic images of both the cell lines showing decrease in cancer cells with increase in dose of the oil. 500 µg/mL of oil showed maximum anti-proliferative effect on both the cell lines with viability percentage of 7.5 in SCC15 and 1.2 in CAL27 (Table 3).

Fig. 4
figure 4

Graphical representation showing anti-proliferative effect of M. oleifera seed oil. a and b Anti-proliferative effect of M. oleifera against cisplatin on SCC15 is represented by linear decrease in cell viability along with increase in concentration; c and d anti-proliferative effect of M. oleifera against cisplatin on CAL 27 is represented by linear decrease in cell viability along with increase in concentration

Fig. 5
figure 5

(1) SCC 15 cell control (2) 5 mg cisplatin as standard (positive control) (3–5) SCC 15 cell proliferation activity in M. oleifera seed oil at concentration of 31.25, 250 and 500 ug/mL of test sample after 24 h incubation (6) CAL 27cell control (7) 5 mg cisplatin as standard (positive control) (8–10) CAL 27 cell proliferation activity in M. oleifera seed oil at concentration of 31.25, 250 and 500 ug/mL of test sample after 24 h incubation

Table 3 Percentage viability of SCC 15 and CAL 27 cells against M. oleifera seed oil showing its anti-proliferative effect

4 Discussion

Many studies have been conducted recently to support the beneficial effects of M. oleifera on health [6]. Moringa oleifera exhibits chemo-preventive properties, which help in inhibition of the growth of human cancer cells. Various studies have recognized the pro-apoptotic and anti-proliferative effects of M. oleifera extracts [14]. There are reports revealing the anti-cancer potential of different parts of M. oleifera, namely leaves, stem, flower and roots [15,16,17,18,19]. Studies have shown that pod extract has medicinally and biologically active compounds [20]. As compared to other parts, in M. oleifera seeds flavonoids, glucosides, and glucosinolates compounds are significantly high, which are responsible for various biological activities [21, 22]. The seed oil has shown strongest activity as antimicrobial, anti-oxidant, and anti-inflammatory properties as reported earlier [23, 24].

Moringa oleifera seed oil has also shown cytotoxicity on other cell lines, likely HeLa, HepG2, MCF-7, CACO-2, and L929 by MTT assay [25, 26]. Positive cytotoxic effects were studied in M. oleifera against EAC and Hep2 cell lines using MTT assay [16]. Other work on ethanolic extracts of M. oleifera exhibited anti-cancer activity and acted as potent growth suppressive agents against human breast cancer MDA-MB-231 cells [27]. The potential chemo-preventive activity of M. oleifera was demonstrated in a human tumor (KB) cell line [28].

In our study, cell proliferation and cytotoxicity assay results suggested that M. oleifera showed toxicity on CAL27, SCC15 cell line. Moringa oleifera oil exhibited anti-proliferation effect in both types of oral squamous cell carcinoma cells. Heptacosane (52% area) was found to be the major component in our sample which is similar to a study reported in Achyranthes aspera L, the chloroform leaf extract showed the highest anticancer activity, in which Heptacosane, 1-chlor exhibited anticancer activity [29]. Heptacosane also acts as a substrate and P-gp inhibitor, retaining the substrate chemotherapeutic drug inside the cell and thus enhancing its cytotoxic effects [30]. Many studies have reported and validated the anti-cancer property of M. oleifera leaves extracts on oral squamous cell carcinoma but to our knowledge, this is the first study proving the anti-cancer property of its seed oil on OSCC. This implies the application of M. oleifera seed oil on cancer therapy but with more quantitative testing to estimate the dose and further evaluation on in-vivo studies.

5 Conclusion

Anti-cancer activity of M. oleifera seed oil is yet to be reported on oral cancer. Since, the seeds shows more oil yield with wide range of phytoconstituents and is easy to obtain we tried to evaluate its anti-cancer activity on two oral cancer cell lines. Moringa oleifera seed oil exhibits anti-cancer activity by decreasing cell proliferation and exhibiting cytotoxicity in CAL27 and SCC15 cells. A low cell survival was detected on treatment with different concentrations in a dose-dependent manner. Thus, our findings provide growing evidence supporting the promising role of M. oleifera seed oil as a potent anti-cancer agent. Additionally, the present work provides a preliminary platform for further investigation of the possible mechanism and role of M. oleifera seed oil on Oral cancer.

Availability of data and materials

All the data generated or analysed during this study are included in this article.

Abbreviations

M. oleifera :

Moringa oleifera

MTT:

3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide

GLOBOCAN:

Global Cancer Observatory (GCO)

OSCC:

Oral squamous cell carcinoma

GCGC-TOF–MS:

2D-gas chromatography-Time of flight–Mass spectrometry

DMEM:

Dulbecco’s modified Eagle’s medium

FBS:

Fetal Bovine Serum

ATCC:

American Type Culture Collection

DMSO:

Dimethyl sulfoxide

IC50:

Half maximal inhibitory concentration

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Acknowledgements

The authors are highly grateful to the Chairman of Siksha ‘O’ Anusandhan (Deemed to be University), Prof (Dr). Manoj Ranjan Nayak for providing the support during the study. The authors are also thankful to the Dean, IMS and SUM Hospital, Siksha ‘O’ Anusandhan (Deemed to be University), Prof. (Dr). Sanghamitra Mishra for encouraging and supporting. We are thankful to the H.O.D, Centre for Biotechnology, Siksha ‘O’ Anusandhan (Deemed to be University) for facilitating oil extraction. We are also thankful to GCGCTOF mass Spectrometer Central facility, IIT Bombay for facilitating our sample analysis.

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RB and SKB contributed to conceptualization and supervision; RB and JNM done validation and review and editing; MD helped in original draft preparation.

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Correspondence to Ruchi Bhuyan.

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Supplementary Information

Additional file 1. 

Phytochemicals identified by 2D GC-TOF-MS analysis.

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Das, M., Mohanty, J.N., Bhuyan, S.K. et al. Anti-cancer activity of Moringa oleifera Lam. seed oil on oral cancer. Beni-Suef Univ J Basic Appl Sci 13, 25 (2024). https://doi.org/10.1186/s43088-024-00475-z

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