S Saradha¹, R Abitha², K Hari Prasath³, S Logithkumar^4*, R Vijayashree⁵, T Sobita Devi ⁶ and P Indhra⁷

¹Department of Pharmacology, Shri Sathya Sai Medical College and Research Institute (SSSMCRI), Sri Balaji Vidyapeeth (Deemed to be University), Ammapettai, Chengalpet district, Tamilnadu, India.

²Chettinad Hospital and Research Institute, Chettinad Academy of Research and Education, Kelambakkam, Chengalpet district, Tamil Nadu, India.

³Department of Pathology, Chettinad Hospital and Research Institute, Chettinad Academy of Research and Education, Kelambakkam, Chengalpet district, Tamil Nadu, India.

⁴Central animal house, Chettinad Hospital and Research Institute, Chettinad Academy of Research and Education, Kelambakkam, Chengalpet district, Tamil Nadu, India.

⁵Department of community medicine, Chettinad Hospital and Research Institute, Chettinad Academy of Research and Education, Kelambakkam, Chengalpet district, Tamil Nadu, India.

Corresponding Author E-mail: logithkumars2001@gmail.com

DOI : https://dx.doi.org/10.13005/bpj/2852

Abstract

Background and Objective: Carcinoma of the skin is the commonest cancer in the world. This study aims to assess the anti-cancer effect of the ethanolic pod and leaf extracts of Moringa Oleifera on 7,12 - dimethylbenz anthracene (DMBA) induced skin carcinoma in mice. Methodology: Animals were divided into 6 groups of 5 each. 7,12 - dimethylbenz anthracene (DMBA) was used topically for four weeks to induce tumour. Group 1 received placebo, Group 2 - standard drug 5- Fluorouracil, Groups 3, 4 received pod extract and Groups 5,6 received leaf extract of Moringa Oleifera of concentration 500 and 1000mg/kg respectively for 3 weeks. Hematological and biochemical parameters such as Hemoglobin, RBC, WBC and platelet counts, SGOT and SGPT, blood urea nitrogen and serum creatinine were done before cancer induction and at the end of 7 weeks. Histopathological examination of the skin, liver and kidney were done at the end of 7 weeks. Results: There was reduction in tumor size in the Moringa Oleifera pod and leaf extract treated groups. Histopathology revealed infiltration of the cells with scarring of epidermis in the extract treated groups indicating the healing of tissues more pronounced at higher concentration. Control group showed atypical squamous cells whereas the standard drug treated group showed infiltration and scarring. Conclusion: This study exhibits a dose dependent anticancer effect of Moringa oleifera pod and leaf extracts in mice which was comparable with the standard drug 5-Fluorouracil.

Keywords

Anti-cancer effect; DMBA, 5-Fluorouracil; Moringa Oleifera; Pod and Leaf extracts; Skin cancer

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Copy the following to cite this article: Saradha S, Abitha R, Prasath K. H, Logithkumar S, Vijayashree R, Devi T. S, Indhra P. Assessment of Anticancer Activity of Crude Ethanolic Extracts of Moringa Oleifera Pod and Leaves on 7,12 - Dimethylbenz Anthracene Induced Skin Cancer in Mice. Biomed Pharmacol J 2024;17(1).

Copy the following to cite this URL: Saradha S, Abitha R, Prasath K. H, Logithkumar S, Vijayashree R, Devi T. S, Indhra P. Assessment of Anticancer Activity of Crude Ethanolic Extracts of Moringa Oleifera Pod and Leaves on 7,12 - Dimethylbenz Anthracene Induced Skin Cancer in Mice. Biomed Pharmacol J 2024;17(1). Available from: https://bit.ly/4be7PuF

Introduction

Cancer is one of the deadliest diseases and its treatment is always challenging.The incidence of Cancer is expected to rise by around 70%, 20 years from now. According to the Cancer facts and figures 2022, it is predicted that 1.9 million patients are to be newly diagnosed and 6,09,360 deaths due to cancer is likely to occur in the United States.¹

Carcinoma of the skin is the commonest cancer in the world.² 1-2% of Cancers in India are skin cancers. There are various modalities of treatment available for the treatment of skin cancers such as surgery, chemotherapy, radiotherapy, immunotherapy but their cost and toxicity are the major concerns.

To overcome these difficulties researchers are constantly studying the anti-cancer effects of various natural plant sources.³Moringa Oleifera commonly called the Drumstick is traditionally used in ayurvedic medicine to treat several diseases. Moringa oleifera being an Indian medicinal plant easily cultivatable in the southern Asian continentis a great source of nutritional content with high economic importance.

Moringa oleifera has medicinal values in its every part like leaves, pods, flower, bark and root. Leaves serve as medicine for asthma, dyslipidemia and flowerscan be used in treatment of arthritis.⁴

Moringa oleifera has been found to have diverse medicinal activities and is studied in vitro and in vivo models of diabetes mellitus, hypertension, peptic ulcer, epilepsy, fever, inflammatory disorders, bacterial and fungal infections.^5,6

This study is done to investigate the anti-cancer effect of Moringa oleifera pod and leaf extracts in 7,12 –diethylbenzanthracene (DMBA) induced skin cancer in mice.

Materials and Methods

Animals

30 Swiss Albino mice, 4-6 weeks old and weighing approximately 20-35 grams were obtained from the animal house of the Institution. The animals were quarantined for one week before the study. Animals were housed in clean polypropylene cages availing free access to standard pellet diet and water at appropriate temperature with natural day-light cycle. The study procedures were done as per the guidelines of CCSEA.

Chemicals

7,12 – dimethylbenz anthracene (DMBA), was purchased from Sigma-Aldrich Ltd., Bangalore. Acetone was used as a solvent for DMBA.5-Fluoro uracil (0.5%), was used as the standard anticancer drug. Ethanol was used for pod and leaf extraction. Normal saline was used as a placebo for mice in control group.

Ethics

The study was conducted after being approved by the Institutional animal ethics committee.(IAEC2/Proposal:62/A.Lr:45/Dt:10.08.2021)

Extract preparation

Moringa oleifera leaves and pods were gathered from nearby locality and washed thoroughly and shade dried for a week. Dried specimen was crushed in a mixer grinder and extracted with ethanol for 72 hours. Extracts after filtration was evaporated completely on water bath. After extraction the residue obtained was dissolved in 65% ethanol and centrifuged at -4 degrees at 4000rotations per minute for 10 minutes and supernatant was used.

Figure 1: Preparation of Pod extract Click here to view Figure

Figure 2: Preparation of Leaf extract. Click here to view Figure

Experimental design

The study had 6 groups with 5 animals in each.

Table 1: Experimental Design

Groups	Induction + Treatment
I	DMBA + Normal saline (10ml/kg, p.o) for 21 days
II	DMBA + 0.5% 5-Fluoro uracil (topical application) for 21 days(7)
III	DMBA +Moringa Oleifera ethanolic pod extract (MOPE 500mg/kg p.o) for 21 days
IV	DMBA +Moringa Oleifera ethanolic pod extract (MOPE 1000mg/kg p.o) for 21 days
V	DMBA +Moringa Oleifera ethanolic leaf extract (MOLE 500 mg/kg p.o) for 21 days
VI	DMBA +Moringa Oleifera ethanolic leaf extract (MOLE 1000mg/kg p.o) for 21 days

DMBA – 7, 12DimethylBenzanthracene.p.o – per oral. MOPE – Moringa Oleifera Pod extract.  MOLE – Moringa Oleifera Leaf extract.

Dose of the extracts in groups III to VI were calculated based on previous study.⁸

Tumour induction

Tumour was induced as per the standard method suggested in previous literature.⁹ The dorsal aspect of each mouse was shaved for about 1 inch. 7,12 – dimethylbenz anthracene (DMBA)100µg, dissolved in 100µL acetone was used to induce tumour. The solution was painted topically over the shaved area twice weekly for 4 weeks to all animals. The appearance of palpable skin tumour was considered as tumour induction.

Following the 4th week, treatment was started to each group and continued for next 3 weeks. At the end of 7th week, the study was terminated. 0.3ml blood was collected under anaesthesia for estimation of haematological and biochemical parameters and all animals were euthanized and tumour tissue collected for histopathological examination.

Figure 3: Mice with hair removed on dorsum. Mice with tumour. Click here to view Figure

General parameters

Behaviour of the mice, movements, food and water intake was observed daily and body weight measured at weekly intervals.

Tumour assessment

Measurement of tumour size was done using the digital vernier calliper of 0.01mm precision with the mice held in hand. Tumour area is body surface area occupied by the tumour calculated by the formula π/4*length*width. Length of the tumour indicates the longest diameter along the vertical axis and width indicates the diameter along the horizontal axis.¹⁰ Measurements were taken at the end of 4th and 7th week of study.

Haematological and biochemical parameters

 The Haemoglobin, RBC, WBC and platelet count, liver enzymes – SGOT, SGPT, blood urea and serum creatinine were evaluated for all animals before the start of the study(baseline) and at completion (at the end of 7th week).

Histopathological examination

After study completion, euthanasia of animals was done and the tissues (skin with tumour, liver and kidney) were sent for histopathological examination. The tissues were processed and sectioned in microtome and stained with haematoxylin and eosin. Examination of the sectioned slides were done under light microscopy.

Statistical Analysis

Statistical Package for Social Sciences v-26was used for statistical analysis. Descriptive statistics was done to obtain the basic characteristics of the data. For the intragroup comparison, parametric paired t test was used to find the p value. For weight, Graphical representation was used to find the difference among the groups.

Results and Discussion:

Tumour size

There was progressive increase in tumour size in the control group. There was a decrease in tumour size in the groups receiving MOLE and MOPE at different concentration (500mg/kg and 1000mg/kg) which was comparable with the standard treated group. Table 2.

Table 2: Tumour Size in mm

	DMBA	DMBA +5-FU	DMBA+ MOPE (500 mg/kg)	DMBA+ MOPE (1000 mg/kg)	DMBA+ MOLE (500 mg/kg)	DMBA+ MOLE (1000 mg/kg)
4th week	9	8.5	7.8	8.6	8.4	9
7th week	13	0	2	0	1.5	0

Body Weight

The weight of mice measured over regular intervals during the study showed significant changes. The control group showed marked decline in their weight suggesting the effect of carcinogenesis. The standard treated group gained weight during the treatment after initial fall. The animals treated with ethanolic extracts of Moringa showed similar weight gain after treatment, preceded by loss after the induction.

Figure 4: Body Weight in Grams. Click here to view Figure

Haematological and Biochemical parameters

Haemoglobin (Hb), total erythrocyte count (RBC), total leukocyte (WBC) count, platelet count, liver enzymes – SGOT, SGPT, blood urea and serum creatinine were assessed before tumour induction and after the termination of the study. It was observed that there was a reduction in the Hb, RBC, WBC and platelet count and a rise in the liver enzymes and renal parameters in the control group when the baseline (before tumour induction) readings were compared with the week 7 values. The standard anti-cancer drug 5-FU and the MOPE and MOLE treated groups showed a rise in the haematological parameters and near normal biochemical parameters at the end of the study which were comparable with the baseline values.

Table 3: Hb and Platelet Count

	Hb gm/dL			Platelet Count 103/Cu.mm
	Baseline	Week 7	P value	Baseline	Week 7	P Value
Control	13.80±.556	11.14±.702	.004*	274.88±35.60	138.80±28.83	.000*
Standard(5-FU)	11.00±.341	14.00±.353	.003*	278.80±37.70	299.60±22.60	.010*
MOPE-500	14.48±.334	13.40±.367	.000*	264.20±75.85	272.40±55.50	.039*
MOPE-1000	11.10±.514	13.66±.511	.018*	272.00±79.90	296.60±66.22	.010*
MOLE-500	14.58±.221	12.22±.485	.009*	262.00±12.28	278.00±51.20	.015*
MOLE-1000	13.50±.393	14.44±.415	.004*	271.20±71.92	290.10±66.69	.013*

* P value <0.05 indicating Statistical significance

 Table 4: RBC Count and WBC Count

	RBC Count million/Cu.mm			WBC Count 103/Cu.mm
	Baseline	Week 7	P Value	Baseline	Week 7	P Value
Control	8.28±.030	7.93±.035	.000*	5.90±.578	3.66±.498	.006*
Standard(5-FU)	8.81±.087	8.94±.038	.039*	6.16±.089	6.86±.378	.023*
MOPE-500	8.76±.014	8.81±.032	.041*	6.44±.181	6.56±.240	.051
MOPE-1000	8.82±.038	8.93±.043	.023*	6.28±.286	6.64±.240	.036*
MOLE-500	8.57±.043	8.64±.045	.051	6.65±.556	6.75±.129	.069
MOLE-1000	8.85±.034	8.96±.040	.032*	6.54±.867	6.88±.311	.047*

* P value <0.05 indicating Statistical significance

Table 5: Liver Enzymes: SGOT, SGPT

	SGOT U/L			SGPT U/L
	Baseline	Week 7	P value	Baseline	Week 7	P value
Control	58.40±2.31	65.40±2.30	.000*	36.80±4.65	40.00±4.74	.000*
Standard	59.61±2.22	60.80±4.32	.071	35.23±6.49	35.21±3.42	.063
MOPE-500	58.23±3.20	59.13±5.24	.062	37.81±6.64	38.82±4.49	.059
MOPE-1000	57.29±2.96	58.52±5.24	.061	35.44±4.72	35.71±4.49	.051
MOLE-500	59.25±1.88	60.72±6.05	.050*	36.25±2.50	37.25±6.18	.052
MOLE-1000	58.43±2.20	59.60±5.41	.063	35.80±2.38	35.57±5.35	.049*

* P value <0.05 indicating Statistical significance

Table 6: Renal Function Tests: BUN, Serum creatinine

	BUN mg/dl			Creatinine mg/dl
	Baseline	Week 7	P value	Baseline	Week 7	P value
Control	15.04±.05	18.35±.03	.000*	.60±.02	.93±.03	.000*
Standard	15.01±.60	15.10±.14	.251	.62±.03	.64±.04	.085
MOPE-500	16.51±.73	16.76±.01	.167	.61±.02	.62±.02	.293
MOPE-1000	15.66±.49	15.76±.35	.272	.65±.05	.67±.03	.138
MOLE-500	16.06±.11	16.17±.12	.136	.64±.03	.67±.06	.037*
MOLE-1000	15.21±.03	15.30±.14	.121	.67±.06	.66±.05	.257

* P value <0.05 indicating Statistical significance

Histopathological examination

The skin section of the control group showed atypical squamous cells with keratin pearls on histopathological examination at the end of the study. There was also evidence of hyperkeratosis and chronic granulomatous tissues. The standard (5-FU) treated group exhibited signs of healing with significant scarring at the dermis. MOPE treated group showed infiltration of tissues with fibrosis signifying the process of healing from the inflammation. The MOLE treated group also showed fibrosis and signs of healing in skin tissues. The section taken from the kidney and liver from the control group showed marked congestion owing to the effect of DMBA. The sections of control kidney showed thickened glomerular basement membrane. The control hepatic cells exhibited hydropic degeneration associated with congestion. The standard and test groups had normal kidney and liver morphology in histopathological analysis. Based on the above findings it is suggestive that the carcinoma induced have produced marked changes in the skin, kidney and liver of mice in control group while the changes in the standard and test groups were less pronounced and showed signs suggestive of healing.

Figure 5: Control – Skin with tumour showing atypical squamous cells with hyper keratosis. Click here to view Figure

Figure 6: Standard – Skin with tumour showing dermis scarring. Click here to view Figure

Figure 7: MOPE 500mg – Skin with tumour showing atypical squamous cells with minimal scarring. Click here to view Figure

Figure 8: MOPE 1000mg –Skin with tumour showing scarring of dermis. Click here to view Figure

Figure 9: MOLE 500mg – Skin with tumour showing  fibrosis of dermis with minimal infiltration. Click here to view Figure

Figure 10: MOLE 1000mg – Skin with tumour showing scarring of dermis. Click here to view Figure

Figure 11: Control – Liver Tissue showing hydropic degeneration. Click here to view Figure

Figure 12: Control -Kidney tissue showing inflammatory infiltrates. Click here to view Figure

Figure 13: Site of tumour after treatment for each group. Click here to view Figure

The invitro antitumor effects of Moringa oleifera leaf extract by Methyl Thiazolyl Tetrazolium bromide (MTT) assay have already been studied. It was observed that chloroform fraction showed higher anticancer activity. The fractions exhibited a dose dependent inhibition of cancer cells with maximum activity at 416 µg mL-1.¹¹

It has earlier been observed that the polyphenolic fraction of Moringa Oleifera leaves had potent antioxidant effect and demonstrated the ability to scavenge free radicals, metal chelation properties and offered protection against DNA nicking. It was also evident that leaf extracts could prevent oxidative stress in rat tissues.¹²

The anticancer effects of Moringa Oleifera leaf and bark extracts in cancer cell lines of breast and colon have been explored and the extracts have found to have anticancer potential.¹³

The anti-tumour effect of Moringa oleifera leaf extract in immunodeficient nude mice has been assessed against human hepatocellular carcinoma (Hep G2) cells using a hollow fibre assay. Hollow fibres containing HepG2 cells were implanted subcutaneously in mice and leaf extract was given orally for four days. The recovered fibres were analyzed by trypan blue exclusion assay and it was observed that HepG2 cells decreased by 60% at a dose of 200mg/kg of moringa leaf extract.¹⁴

The cytotoxic effect of ethyl acetate leaf extract in lymphoma ascites model of Dalton has been evaluated. Lymphoma was induced in mice by intraperitoneal injection of DLA (Dalton’s Lymphoma ascites) and moringa ethyl acetate extract treatment given orally for ten days. It was observed that the treated mice had significantly longer survival rate when compared with the untreated mice.¹⁵

The active substances such as phenolic acid, flavonoids and niazimicin in M.oleifera prevent the progress of cancer by down regulation of genes controlling tumour progression and induction of apoptosis.⁵

Moringa oleifera flower is found to have trypsin inhibitors that has shown potent antitumor and antiangiogenic effects on sarcoma cells.¹⁶ Probably this could have been the cause of antitumor effect of Moringa oleifera pod and leaf, though in the current study the mechanisms of anti-tumour effect were not studied.

It is evident from our study that ethanolic extracts of Moringa Oleifera pod and leaf have anticancer effect against 7,12-DMBA induced skin cancer in mice. The tumour size reduced to zero, the body weight showed an improvement after the initial fall due to cancer induction. The haematological and biochemical parameters exhibited a response similar to the standard drug when treated with the pod and leaf extracts of Moringa Oleifera. The histopathological examination of the skin tissue after treatment revealed that the pod and leaf extracts had shown a complete tumour regression.

Moringa Oleifera pod and leaf extracts have shown reduction in skin tumour size and improvement in haematological, biochemical parameters and histopathological examination in the current study.

Conclusion

Skin carcinoma is one of the most common tumours in humans. Our study exhibits a dose dependent anticancer effect of Moringa oleifera pod and leaf extracts in mice which were comparable with the standard drug 5-Fluorouracil. Hence Moringa Oleifera pod and leaf can be considered as an adjuvant therapy for skin cancers along with the standard treatment if further studies are conducted on human subjects. 

Acknowledgement

All the authors are thankful to Chettinad Academy of Research and Education for providing the facilities for the conduct of this research.

Conflict of Interest

The authors declare no conflict of interest.

Funding Sources

 This research was not funded by any external agency.

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