Mutagenicity, cytotoxic and antioxidant activities of Ricinus communis different parts
Chemistry Central Journal volume 12, Article number: 3 (2018)
Ricinus communis (castor plant) is a potent medicinal plant, which is commonly used in the treatment of various ailments. The present study was conducted to appraise the cytotoxicity and mutagenicity of R. communis along with antioxidant and antimicrobial activities. Cytotoxicity was evaluated by hemolytic and brine shrimp assays, whereas Ames test (TA98 and TA100) was used for mutagenicity evaluation. Plant different parts were extracted in methanol by shaking, sonication and Soxhlet extraction methods. The R. communis methanolic extracts showed promising antioxidant activity evaluated as through total phenolic contents (TPC), total flavonoid content (TFC), DPPH free radical inhibition, reducing power and inhibition of linoleic acid oxidation. R. communis seeds, stem, leaves, fruit and root methanolic extracts showed mild to moderate cytotoxicity against red blood cells (RBCs) of human and bovine. Brine shrimp lethality also revealed the cytotoxic nature of extracts with LC50 in the range of 0.22–3.70 (µg/mL) (shaking), 1.59–60.92 (µg/mL) (sonication) and 0.72–33.60 (µg/mL) (Soxhlet), whereas LC90 values were in the range of 345.42–1695.81, 660.50–14,794.40 and 641.62–15,047.80 µg/mL for shaking, sonication and Soxhlet extraction methods, respectively. R. communis methanolic extracts revealed mild mutagenicity against TA98 (range 1975 ± 67 to 2628 ± 79 revertant colonies) and TA100 (range 2773 ± 92 to 3461 ± 147 revertant colonies) strains and these values were 3267 ± 278 and 4720 ± 346 revertant colonies in case of TA98 and TA100 positive controls, respectively. R. communis methanolic extracts prevented the H2O2 and UV to Plasmid pBR322 DNA oxidative damage. Results revealed that R. communis is a potential source of bioactive compounds and in future studies the bioactive compounds will be identified by advanced spectroscopic techniques.
Medicinal plants are commonly used to treat various ailments in most of the developing communities. Besides, these are a potent source of food, fodder and fuel, etc. Ethnopharmacology involves the investigation of those plants used by traditional communities without understanding the pharmacological basis of medicinal plants [1,2,3]. Ricinus communis (family Euphorbiaceae) is a soft wood small tree, located in tropical and warm temperate regions of the world and bioactivity has been studied well of this plant [4, 5]. R. communis plant is used for the treatment of hepatitis, skin and breast cancer . Naturally, plants synthesize phytochemicals as a part of their defense system under variable and harsh environmental conditions, which provide defense for plants against microorganism, pests and insects [7,8,9,10,11,12,13]. In developing country, plant derived herbal medicine are used commonly due to easy access and affordable, which are also regarded as safe versus synthetic drugs [14,15,16,17]. Moreover, it is believed that plant based bioactive compounds have no side effects as compared to synthetic drugs and has wide range of therapeutic applications [18, 19]. However, plant extracts may contain toxic compounds , which can harm the living organisms. R. communis seeds, leaves, fruit, stem and bark are used in different traditional therapeutic practices by local practitioner (Hakeem) . Therefore, the toxicity profiling (using bioassays) of such important plants is very helpful to appraise the safety [22,23,24,25,26,27,28,29,30,31,32,33]. In this regard, the bioassays (hemolytic and brine shrimp) are the standard tests to evaluate the cytotoxicity, whereas TA98 and TA100 (based on salmonella mutant strains) are the reference tests for mutagenicity evaluation. The shrimp lethality assay was developed by Michael , later Vanhaecke , and Sleet and Brendel . In this assay, Artemia nauplii are exposed to test compound and lethality is used to estimate cytotoxicity. This has been used as a useful tool for preliminary assessment of toxicity  i.e., fungal , extract [39, 40], metals , toxins , pesticides , wastewater [44,45,46,47,48], fumonisins  and dental materials . Various authors also utilized this hemolytic test for cytotoxicity evaluation of different systems [51,52,53,54,55,56]. The Ames test was proposed by Ames and coworker [57,58,59] and have been used for mutagenicity evaluation of tobacco smoke , wastewater , treated wastewater [44, 45], herbal extracts  and toxic chemicals .
In view of importance of R. communis as a medicinal plant, nevertheless, researcher focused on cytotoxicity and mutagenicity using standard assays. Therefore, the principal objectives of the present study were to investigate the cytotoxicity and mutagenicity of different parts of R. communis parts along with bioactivity profiling. Hydrogen peroxide induced DNA damage protective efficiency was also evaluated of the extracts.
Materials and methods
Ricinus communis plant was collected from the Botanical Garden, University of Agriculture, Faisalabad, Pakistan and seeds were purchased from local market, Faisalabad. The plants and seeds specimens were identified by Botanist, Dr. Mansoor Hameed, Department of Botany University of Agriculture Faisalabad, Pakistan.
Sample preparation and extraction
The collected leaves, stem, fruit, roots and seeds of R. communis were washed with distilled water and shade dried. Dried plant parts were ground and passed through 80 mm mesh size. Different parts (20 g) were extracted in methanol (100 mL) using shaking, Soxhlet and sonication extraction methods. In case of shaking, extraction was performed for 6 h at room temperature (Shaker Gallenkamp, UK). For sonication, ultrasonic treatment (42 kHz, 135 W; Branson ultrasonic corporation, USA) was applied for 30 min. For Soxhlet, extraction was performed in Soxhlet extractor for 3 h. After extraction, methanol was evaporated and concentrated extracts were stored at − 4 °C.
Total phenolic contents (TPC)
The TPC was assessed using Folin–Ciocalteu reagent following reported method elsewhere . The TPC was calculated using a calibration curve (gallic acid, 10–100 ppm) and data was expressed as GAE of dry plant matter.
Total flavonoid contents (TFC)
Extract (0.1 g/mL) was placed in 10 mL volumetric flask and 5 mL distilled water was added. Then, 0.3 mL of 5% NaNO2 was added and after 5 min, 0.6 mL of 10% AlCl3 was added. After another 5 min, 2 mL of 1 M NaOH was added, mixed well and absorbance was measured at 510 nm. TFC amount was evaluated as catechin equivalents (g/100 g of DM) .
DPPH Radical scavenging assay
For DPPH activity measurement, extract (0.1 mg/mL) were mixed with 1 mL of 90 µM DPPH solution and then, final volume was made to 4 mL by adding 95% methanol. After 1 h of incubation at room temperature, the absorbance was recorded at 515 nm and response was calculated as in Eq. 1 .
where, Ao is the absorbance of the control and A s is the absorbance of the extract (sample).
Antioxidant activity in linoleic acid system
The percent inhibition of peroxidation of linoleic acid system . Extract (5 mg) and linoleic acid (0.13 mL), 99.8% ethanol (10 mL) and 10 mL of 0.2 M sodium phosphate buffer (PH 7.0) were mixed thoroughly. Then, 25 mL with distilled water was added and incubated at 40 °C. The degree of oxidation was measured following thiocyanate method and percent inhibition of linoleic acid was calculated using Eq. 2.
where, As,175 h and A0,175 h are the absorbance values at 175 h of sample and control, respectively.
Reducing power determination
The reducing power was determined as described elsewhere . Sodium phosphate buffer (5.0 mL, 0.2 M, pH 6.6), and potassium ferricyanide (5.0 mL, 1.0%) and R. communis extract was mixed and incubated at 50 °C for 20 min. Then, 5 mL of trichloroacetic acid (10%) was added and centrifuged at 980×g for 10 min at 5 °C. The supernatant (5.0 mL) was collected and diluted with distilled water (5.0 mL) along with ferric chloride (1.0 mL, 0.1%) addition and absorbance was recorded at 700 nm (Hitachi U-2001, Tokyo, Japan).
Powell  method was adopted for hemolytic test. Blood sample (human and bovine, collected in heparinized tubes) was centrifuged for 5 min at 850×g for three to five times using chilled (4 °C) sterile isotonic phosphate buffer saline (PBS) having pH 7.4 and RBCs were separated. The separated RBCs were suspended in the PBS. Erythrocytes were counted using hemocytometer, which were 7.068 × 108 cells/mL. Then, 20 µL of plant extract was mixed with 180 µL blood cell suspension and samples were incubated with agitation for 30 min at 37 °C. The tubes were placed on ice for 5 min and contents were centrifuged for 5 min at 1310×g. A 100 µL supernatant was taken and 900 µL chilled PBS was added and eppendorfs were placed on ice for 5 min and absorbance was noted at 576 nm (BioTek, Winooski, VT, USA). The RBCs lysis (%) was calculated using relation shown in Eq. 3.
where As is absorbance of the sample and Atx−100 is the absorbance of Triton X-100. Triton X-100 (0.1%) was used as a positive control and PBS was used as negative control.
Brine shrimp lethality assay
Brine shrimp (Artemia sp.) eggs were hatched in a culture flask (15 × 15 × 15 cm) filled with sterile, artificial seawater (prepared using sea salt 38 g/L, the pH was adjusted to 8.5 with 1 M NaOH) under constant aeration (aquarium air pump) and illumination for 48 h at 25 °C. After 48 h the shrimp-larvae were collected and exposed extract under investigation. The brine shrimp lethality assay was performed following reported method [39, 70]. Plant extracts were diluted to concentrations of 10, 100, 1000 and 3000 µg/mL for cytotoxicity testing. Twenty brine shrimp larvae were placed in vials containing extract using a plastic pipette with a 2 mm diameter tip. The larvae survival was counted under the stereomicroscope after 24 h and percent death rate at each dose and control were calculated. Salt-water and cyclophosphamide were used as negative and positive controls, respectively, and LC50 and LC90 values were estimated.
Two S. typhimurium strains TA98 and TA100 were used . The extract was considered mutagenic, if the number of revertant colonies on the plates containing test compounds was twice the number of revertant colonies in control plates (background) (extract/control revertant colonies ≥ 2.0) . All the experiments were performed in triplicates and data, thus obtained was expressed as mean ± SD.
Results and discussion
The antioxidant activity results are shown in Table 1. It was observed that extraction methods showed variable antioxidant activities in spite of same plant parts were used, however, all plant parts furnished promising antioxidant activities. The sonication extraction method showed higher TPC followed by Soxhlet and shaking and a similar trend was observed in case of TFC, DPPH percentage inhibition, reducing power and linoleic acid inhibition. The TPC, TFC, DPPH percentage inhibition, reducing power and linoleic acid inhibition values in case of sonication (for seeds) were 361 ± 2 (mg/100 g), 171 ± 2.8 (mg/100 g), 8.8 ± 0.6 (%), 87.28 ± 0.1 (%) and 0.854 ± 0.3 (OD), whereas Soxhlet showed these values 149 ± 1.5 (mg/100 g), 94 ± 0.4 (mg/100 g), 7.42 ± 0.5 (%), 48.19 ± 0.3 (%) and 0.523 ± 0.7 (OD) and in case of shaking 122 ± 3 (mg/100 g), 15 ± 1 (mg/100 g), 7.25 ± 0.3 (%), 43.56 ± 0.3 (%) and 0.481 ± 0.8 (OD) were recorded, respectively. The antioxidant in case of extraction methods and among plant parts found significantly different (P < 0.05). in case of shaking extraction method, leaves showed higher TPC and TFC values followed by seed, fruit, stem and roots, whereas in case of DPPH the trend was as; stem > leaves > seeds > roots > fruit. The reducing power of plant parts extracts was found in following order; leaves > seeds > fruits > stem and roots and linoleic acid percentage inhibition was found in following order; leaves > seeds > fruit > stem > roots. The antioxidant activity trend for different parts for sonication and Soxhlet also showed same trend, i.e., in case of sonication, the TFC values were recorded to be 361 ± 2, 11 ± 0.3, 58 ± 1, 64 ± 2 and 12 ± 0.5 (mg/100 g), TFC values were 171 ± 2.8, 4 ± 0.6, 32 ± 1.2, 46 ± 1.2 and 2.8 ± 0.6 (mg/100 g) and 8.8 ± 0.6, 6.2 ± 0.9, 10.45 ± 0.7, 5.67 ± 0.1 and 13.29 ± 0.7 (%) of DPPH percentage inhibition for seeds, stem, leaves, fruit and roots. The reducing power of seeds, stem, leaves, fruits and roots were 87.28 ± 0.1, 8.14 ± 0.7, 20.64 ± 0.3, 23.54 ± 0.6 and 11.39 ± 0.2 (%) and linoleic acid percentage inhibition values were recorded to be 0.854 ± 0.3, 0.184 ± 0.2, 0.356 ± 0.8, 0.379 ± 0.3 and 0.234 ± 0.9 (OD) for seeds, stem, leaves, fruits and root extracts, respectively. Earlier, it is also reported that the aerial part of R. communis has potent antioxidant activity  and in present investigation, leaves and seeds showed considerable higher (P < 0.05) higher antioxidant activity versus other parts. Antioxidant activity of n-hexane, dichloromethane, acetone, and methanol extracts of R. communis was also quantified using ABTS+ method. Among all extracting solvents, methanol extract showed the highest percentage free radical scavenging activity (95%) followed by acetone (91%), dichloromethane (62%), and n-hexane (50%). The antioxidant activity of R. communis seeds have also been reported previously  and antioxidant activity was comparable with present investigation. Nevertheless, the comparative studies based on different parts using different extraction methods were performed. So far, present investigation indicates that R. communis different parts had promising antioxidant activities; however, antioxidant activities were variable depending upon plant parts and extracting methods.
The cytotoxicity of R. communis different methanolic extract was evaluated through hemolytic and brine shrimp assays. The hemolytic activity of the extracts was compared with Triton X-100 (positive control-100% RBCs lysis) and PBS (negative control-0% lysis). The lysis results of both human and bovine RBCs are shown in Table 2. In case of shaking, R. communis methanolic extracts showed cytotoxicity in the range of 3.51–50.9% (human RBCs % lysis) and 2.23–44.91% (bovine RBCs % lysis), whereas sonication revealed the cytotoxicity in the range of 0.76–15.56% (human RBCs) and 0.71–13.32% (bovine RBCs) and in case of Soxhlet method, the human RBCs and bovine RBCs lysis percentages were 0.70–34.20% and 0.07–41%, respectively. The R. communis plant parts also showed different cytotoxic effects and in case of In the case of human RBCs, the cytotoxicity was in following order; seeds > fruits > leaves > roots > stem (shaking), leaves > roots > fruits > seeds > stem (sonication) and leaves > fruits > stem > roots > seed (Soxhlet). Similar trend was observed in case of bovine RBCs lysis, however, R. communis all parts showed slightly less RBCs lysis in case of bovine RBCs versus human RBCs.
The brine shrimp lethality assay results are shown in Table 3. In case of shaking, the LC50 values were recorded of 0.40, 0.22, 1.49, 0.22, 3.71 concentrations (µg/mL) for seeds, stem, leaves, fruit and root, respectively, whereas seeds, stem, leaves, fruits and roots extracted by sonication method revealed the LC50 values of 9.92, 34.24, 2.12, 1.59, 60.92 (µg/mL), respectively and these values were 4.26, 0.72, 0.67, 8.62 and 33.60 (µg/mL) in case of Soxhlet extraction method. The LC90 values were found in the range of 345.42–1695.81 (µg/mL) (shaking), 660.50–14,794.40 (µg/mL) (sonication) and 641.62–15,047.80 (µg/mL) (Soxhlet). In case of brine shrimp assays, the plant different parts showed variable cytotoxicity level and extraction methods also affected the cytotoxicity level significantly. Overall, Soxhlet extracted samples showed higher cytotoxicity followed by sonication and shaking methods.
Ricinus communis methanolic extracts mutagenic results are shown in Table 4. In case of shaking extraction method, the TA98 revertant colonies were 2278, 2356, 2018, 2593 and 2628 (revertant colonies) for 50 µg extract/plate of seeds, stem, leaves, fruits and roots, respectively, whereas, 2139, 2072, 1975, 2471 and 2318 revertant colonies were recorded in case of sonication and for Soxhlet 1862, 1939, 2183, 2028 and 2319 revertant colonies were observed in response of seeds, stem, leaves, fruits and roots, respectively. TA100 strain showed a similar mutagenicity trend based on extraction methods and plant parts, however, the colonies reversion in case of TA100 were slightly higher than TA98 strain. In comparison to control, R. communis plant showed mutagenic nature. Regarding toxicity, there is lack of reports investigating the cytotoxicity and mutagenicity of R. communis using hemolytic, brine shrimp and Ames tests. However, these bioassays found to be short-term assays to evaluate the toxicity of extracts. These findings are in line with previous studies (Table 5), in which toxicity of this plant has also been reported in different models i.e., abrin and ricin (in R. communis extracts) reported to toxic by studying to SH- and S–S groups . In another study, R. communis toxicosis in a sheep flock was studied and R. communis showed intoxication, in which most of the animals showed profuse watery diarrhoea, dehydration, weakness, salivation, mydriasis, teeth grinding, hypothermia and recumbency. High haematocrit, creatinine, high concentration of serum BUN and phosphorus and high activity of serum CK and AST were also observed along with cardiac haemorrhage, severe gastroenteritis, necrosis and acute tubular necrosis in kidneys and hepatic necrosis . Antifeedant and toxic effects of leaf extracts of R. communis were also studied and results revealed that the extract had moderate effects towards these pests and author suggested the use of plant extract as a potential source of bioactive compounds for crop protectant against pest . Antidiabetic activity of ethanolic extract of roots of R. communis also studied and 500 mg/kg BW showed promising efficiency in lowering the fasting blood glucose . In view of results of the present investigation and reported studies, it can be concluded that R. communis is a potential source of bioactive compounds and could be used for the development of drugs for the treatment of various ailments.
DNA protection assay was performed by inducing DNA damage by UV light and H2O2. The NDA damage caused by H2O2 and UV radiation and extracts protection efficiency was studied using Plasmid pBR322. In DNA damage, H2O2 generates OH· as shown in Eq. 4, which are responsible for DNA breakage through oxidative reaction (Eq. 5) [84, 85]. The Plasmid pBR322 DNA damage and protective results are shown in Fig. 1. The Plasmid pBR322 DNA ladder band is clear (lane 1), whereas Plasmid pBR322 DNA treated with H2O2 revealed that DNA damage was damaged (lane 3). The UV light and H2O2 in combination also induced Plasmid pBR322 DNA (lane 4). The Plasmid pBR322 DNA treated with R. communis extracts (extracted by different methods) in the presence of H2O2 + UV results are shown in lanes 5–12. Results revealed that H2O2 + UV induced Plasmid pBR322 DNA damage was protected. The H2O2 + UV treated DNA converted the Plasmid pBR322 into open circular form, whereas upon treatment with the extract regained the native form of Plasmid pBR322 DNA, which revealed the R. communis extracts protected DNA from the OH· induced damage. As it is well known that OH· is a strong oxidative agent and can damage the DNA by oxidation process, which indicates that free radical induced DNA damage cab be protected using R. communis extract. Since Plasmid DNA is damaged by OH· radical by free radical-induced chain reaction mechanism and OH· react with nitrogenous bases producing base free radical and other radicals. The base radical in turn reacts with the sugar moiety causing breakage of sugar phosphate backbone of nucleic acid resulting in strand break [85, 86]. Previous studies also supported these results that plant extract can protect DNA damage, i.e., D. bipinnata extract prevented the oxidative damage to DNA in the presence of a DNA damaging agent (Fenton’s reagent) at a concentration of 50 μg/mL. Also, the presence of extract protected yeast cells in a dose-dependent manner from DNA damaging agent . Recently, the DNA damage inhibition potential of a methanolic extract of C. carandas leaves were also studied . It was reported that extract showed significant H2O2 scavenging activity (median inhibitory concentration, 84.03 μg/mL) and completely protected pBR322 Plasmid DNA from free radical-mediated oxidative stress. Authors correlated the DNA damage inhibition with high content of phenolic compounds in C. carandas extracts. In another study, the free-radical scavenging properties and potential to prevent DNA damage of 56 extracts from 14 medicinal plants were studied. The extracts protected DNA against photolyzed H2O2-induced oxidative damage by all plant extracts . So far, results revealed that the R. communis extract has ability to protect DNA damage and present study provides roadmap for identification and isolation of bioactive compounds and possible use to manage the free radical induced diseases.
Cytotoxicity, mutagenicity, antioxidant as well as DNA protective efficiency of R. communis (seeds, stem, leaves, fruit and root) methanolic extracts were evaluated. Extracts showed variable antioxidant activity among plant parts and extraction methods. The R. communis also protected Plasmid pBR322 DNA from H2O2 and UV damage. Bioassays (Hemolytic, brine shrimp and Ames test) revealed that the R. communis methanolic extracts have compounds responsible for mild to moderate to moderate toxicity. R. communis may be a potential source of compounds for the development of new medicine and future studies will be focused on the identification of compounds responsible for bioactivity.
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MA, AA, AA and IMT designed and performed experiments as well as collected the data, whereas MA, ZM and MI handled data analyses, interpreted results and preparation of the manuscript. All authors read and approved the final manuscript.
Authors are highly thankful to the Higher Education Commission Islamabad, Pakistan, for providing funds under IPFP program (No-356SRGP/R&DHEC/2014). We are also thankful to Dr. Ehtisham-ul-Haque and Dr. Tariq Hussain for their guidance in preparation of manuscript.
The authors declare that they have no competing interests.
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Abbas, M., Ali, A., Arshad, M. et al. Mutagenicity, cytotoxic and antioxidant activities of Ricinus communis different parts. Chemistry Central Journal 12, 3 (2018). https://doi.org/10.1186/s13065-018-0370-0