Hepatoprotective activity of aqueous methanolic extract of Morus nigra against paracetamol-induced hepatotoxicity in mice
Abstract
Morus nigra (Family Moraceae) is traditionally used injaundice, diabetes, hypertension, cough, fever and cancer. The current study was conducted to determine hepatoprotective activity of aqueous methanolic extract of leaves of M. nigra. Two doses of 250 and 500 mg/kg p.o showed that extract of M. nigra produced significant (p<0.001) reduction in liver enzymes (ALT, AST, ALP) and total bilirubin induced by paracetamol and the results are comparable to silymarin (p<0.001). Results were supported by histopathological investigations, phytochemical screening and detection of active constituents by HPLC. The current study showed that aqueous methanolic extract of M. nigra possess hepatoprotective activity that might be due to quercetin, luteolin and isorhamnetin. It was concluded from this study that M. nigra has hepatoprotective activity against paracetamol induced liver injury in mice.
Introduction
The problem of resistance and tolerance to the existing drugs has created a decreased efficacy of these drugs in use. This problem has been tried to be overcome by increasing the drug delivery to the target site by the use of polymers (Khalid et al., 2009; Hussain et al., 2011) or through nanotechnology (Naz et al., 2012; Ehsan et al., 2012), synthesis of new drugs, either by the use of proteomics (Qadir, 2011), or synthesis from lactic acid bacteria (Masood et al., 2011), or marine microorganisms (Javed et al., 2011). However, now-a-days, the trend is also being changed to the use of herbal products or extracts to control the diseases. The plant kingdom still holds many species containing substances of medicinal value which have yet to be discovered: large numbers of plants are constantly being screened for their possible pharmacological value particularly for their anti-inflammatory (Qadir, 2009), hypotensive (Qadir, 2010), hypoglycemic, amoebicidal, antifertility, cytotoxic, antibiotic (Amin et al., 2012), spasmolytic, bronchodilator (Janbaz et al., 2013), antioxidant (Janbaz et al., 2012) and hepatoprotective properties (Ahmad et al., 2012). Many plants have been identified as hepatoprotective like Trianthema decandra (Balamurugan and Muthusamy, 2008), Cocculus hirsutus (Thakare et al., 2009), Carica papaya (Sadeque and Begum, 2010), Carissa spinarum (Hegde and Joshi, 2010), Convolvulus arvensis (Ali et al., 2013), Dodonaea viscosa (Khan et al., 2013), Trichodesma sedgwickianum (Saboo et al., 2013), Ipomoea staphylina (Bag and Mumtaz, 2013) and Khamira Gaozaban Ambri Jadwar Ood Saleeb Wala (Akhtar et al., 2013).
Morus nigra (Moraceae) widely distributed in Asia, Africa, Europe, and America. It is commonly as Black Mulberry (English) and Shahtoot (Hindi/Urdu). Pharmacologically it has been reported that M. nigra is antioxidant (Ozgenet al., 2009), antinociceptive (Padilhaet al., 2009), anti-inflammatory (Padilhaet al., 2010), antidiabetic (Husseinzadehet al., 1999), antibacterial (Mazimbaet al., 2011), cardiac depressant (Malik et al., 2012), effective for maternal health (Volpetoet al., 2011), vermifuge and anti-cancer (Kumar and Chauhan, 2008).
Important phytoconstituents e.g. flavonoids, alkaloids and phenols have been reported in this plant (Malik et al., 2012; Özgen et al., 2009). Most of the flavonoids have hepatoprotective activity (Ali et al., 2013). Traditionally M. nigra is worthwhile to cure jaundice (Abbasiet al., 2009). Phytochemical profile and traditional use of M. Nigra in liver injury appealed us to scientifically evaluate its hepatoprotective potential.
Materials and Methods
Selection and collection of plant: The plant was selected on the basis of its traditional and phytochemical profile and collected from Allied hospital, Agriculture University, Local Nursery Farms from Faisalabad and identified by Dr. Mansoor Hameed, Associate Professor, Department of Botany, University of Agriculture Faisalabad. For future reference plant was kept in the department herbarium.
Preparation of plant extract: The leaves of the plant were washed and put to dry under shade which were finally grounded to powder (3.2 kg) with the help of commercial grinder. Powdered leaves were soaked in 8 L aqueous methanol (70:30) for 7-10 days with occasional shaking. Solution was filtered through muslin cloth and marc was pressed to achieve all filtrate. The filtrate was evaporated with the help of rotary evaporator at 70°C. At the end of evaporation dark brownish jelly like paste was obtained that was stored in amber colored glass bottle for further analysis.
Experimental animals: Swiss albino mice of both sexes weighing 22-35 g were used for study and all were kept in animal house of College of Pharmacy, GC University Faisalabad, Pakistan. The animals were housed in cages and maintained under standard laboratory conditions (temperature 25 ± 2°C) with dark and light cycle (12/12 hours). The acclimatization period was lasted for 10 days (Iwalokunet al., 2006). These were fed with standardized pellet diet and water ad libitum. All the experimental methods and materials were reviewed and approved by supervisory committee of College of Pharmacy, GC University Faisalabad. Research was conducted in accordance with the internationally accepted principles for laboratory animal use and cares as found in for example the European Community guidelines (EEC Directive of 1986; 86/609/EEC) or the US guidelines.
Experimental protocol: All the animals were divided into five groups having 5 animals each. Group I was control, receiving distilled water only, for seven days. Group II served as paracetamol control, receiving paracetamol p.o. 250 mg/kg dissolved in water for 7 days. Group III, silymarin control in which silymarin was given as reference drug 50 mg/kg daily for 7 days and paracetamol was administered 3 hours after silymarin (Girishet al., 2009). Group IV Received aqueous methanolic (70:30) extract of M. nigra (AMMN) at doses 250 mg/kg p.o. for 7 days and received paracetamol 250 mg/kg 3 hours after extract dose. Group V received aqueous methanolic extract of M. nigra (AMMN) at doses 500 mg/kg p.o. for 7 days and received paracetamol 250 mg/kg 3 hours after extract dose (Sabir and Rocha, 2008). Experimental protocol was reviewed by Supervisory and Ethical committee for animal research of College of Pharmacy of Institute.
All the animals were fasted for 12 hours and anesthetized with light chloroform and sacrificed by cervical decapitation on 8th day at same time of last day dose. Blood samples were collected in eppendorf tubes for serum preparation. Hepatotoxicity was indicated by a significant elevation in the activity of ALT, AST, ALP and total bilirubin (TBR) in acetaminophen-challenged mice compared with the controls throughout the experiment (Vimal and Devaki, 2004).
Biochemical investigation: After collection of blood, clotted blood was subjected to centrifugation for separation of serum at the rate of 4,000 for 20 min. Liver function tests e.g. ALT, AST, ALP and total bilirubin was evaluated by adopting standard operating procedures (Shanmugasundaram and Venkataraman, 2006).
Histopathological studies: The liver from animals was separated and placed in 10% buffered formalin (4% formaldehyde in phosphate buffer solution). The dyes used for histopathological examination was Hematoxylin and Eosin for nuclei and cytoplasm staining into blue/purple and pink respectively. Summary of methodology is shown in Figure 1.
Figure 1: Summary of study methodology
Phytochemical screening: The preliminary phytochemical screening of various active compounds were accomplished by methods used by Farhanet al., 2012 where filtered ethanolic extract (70%) and powdered plant were used as shown in Table I.
Table I:Protocols for phytochemical screening of Morus nigra
| Detection | Procedure | Observation |
|---|---|---|
| Tannins | Ferric chloride reagent (FeCl3) 1% drops were added to 10 ml of the extract | Appearance blue color |
| Resins | 20 mL HCl 4% were added in 10 mL of extract | Turbidity |
| Coumarins | 5 mL of extract in a test tube was covered by a filter paper saturated in NaOH and was putted in water bath, boiled for 10 min. The filter paper was taken and exposed to UV light | Appearance green bright yellow color |
| Saponins | Extract in test tube was shacked for 5 min using a vortex | Appearance of big foamy |
| Alkaloids | 0.2 g powder of the plant was dissolved in 10 mL of HCl 1% and they were transferred to a water bath for few min. 1 mL of the filtrated extract was treated with 2-4 drops of Dragendorff's reagent | Orange reddish precipitation |
| Phenols | In beakers, 5 mL of each extract was taken and 1 mL of FeCl3 1% and 1 mL of K3(Fe(CN)6) 1% were added | Fresh radish blue color |
| Terpenoids | 1 mL of acetic anhydride and 2 mL of concentrated sulphuric acid were added to beakers containing 1 mL of extract | Reddish brown on the interface |
| Volatile oils | l0 mL of extract was filtered by filter paper till saturation and then exposed for UV light | Appearance of a bright pinkish color |
| Flavonoids | Two solutions A and B from plant extract were prepared. The solution A contains 5 mL of ethanolic extract. The solution B consists of 5 mL of ethanolic solvent added to 5 mL of KOH 50%. Then the two solutions A and B were mixed together | Appearance of yellow color |
The results of phytochemical screening have been shown in Table II. Qualitative determination of flavornoid contents were determined by HPLC analysis of aqueous methanolic extract used in this study.
Table II:Effect of aqueous methanolic extract of Morus nigra (AMMN) on liver enzymes and total bilirubin
| Treatment Groups | ALT (IU/L) | AST (IU/L) | ALP (IU/L) | TBR(g/dL) |
|---|---|---|---|---|
| Normal (D/W) | 32.8 ± 2.1 | 36.5 ± 3.6 | 216.2 ± 10.0 | 0.9 ± 0.0 |
| Paracetamol Control (250 mg/kg) | 112.1 ± 4.2 | 101.2 ± 9.2 | 413.4 ± 21.7 | 2.0 ± 0.2 |
| Silymarin (50 mg/kg) + Paracetamol | 41.6 ± 3.1b | 39.8 ± 07.8b | 266.4 ± 32.7a | 0.9 ± 0.1a |
| AMMN (250 mg/kg) + Paracetamol | 50.6 ± 7.2b | 41.8 ± 5.0b | 288.0 ± 10.1a | 0.9 ± 0.1a |
| AMMN (500 mg/kg) + Paracetamol | 45.4 ± 5.0b | 40.6 ± 6.4b | 272.1 ± 11.2b | 0.9 ± 0.1a |
| ap<0.01, bp<0.001 | ||||
HPLC analysis for determination of phytoconstituents: For qualitative separation of compounds, SYKAM HPLC system was used equipped with S-1122 Solvent Delivery System, S-3210 UV/VIS Detector, S-5111 Injector Valve Bracket, pump (1500 series), Column oven and pre-packed C-18 column (250 × 4.5 mm, 5 um particle size). For sample injection glass syringe of 25 µL was used. Data was analyzed by using SampleClarity Light software installed in Laboratory computer attached with HP inkjet printer. HPLC protocol for determination of Flavonoids was followed according to Saddiqeet al., (2011) in which standard solutions were prepared in HPLC grade methanol at concentration 100 µg/mL and were stored in refrigerator at -20°C. All standard solutions were filtered by using 0.45 µm filters and further dilutions were made by adding methanol if needed. For concentration 100 µg/mL, 0.001 g extract was weighed on sensitive weight machine and dissolved in 10 mL of methanol (HPLC grade). All the prepared samples were stored in refrigerator at 4°C and filtered through 0.45 µm filters before HPLC analysis. Acetonitrile and water of HPLC grades were used to prepare mobile phase in 1:1 proportion. Final solution of mobile phase was acidified with 1%acetic acid by adding few drops. Mobile phase was filtered through 0.45 µm filters before use. Mobile phase was run at flow rate 1 mL/min and compounds were detected at 254 nm. HPLC system was thoroughly washed with methanol before use for about one hour. After analysis retention times was compared to that of standards for detection of flavonoid contents in aqueous methanolic extract (Saddiqe et al., 2011).
Statistical analysis: All the data were subjected to one-way ANOVA (Analysis of variance) by SPSS version 17.0 (SPSS Inc., Chicago, IL, USA) for statistical analysis. Results were represented as mean ± SE.
Results
The normal ALT value 32.8 ± 2.1 IU/L elevated to 112.1 ± 4.2 IU/L by paracetamol intoxication. After administration of 250 and 500 mg/kg of aqueous methanolic extract of M. nigrathe mean ALT values were observed as 50.6 ± 7.2 IU/L (p<0.001) and 45.4 ± 5.0 IU/L (p<0.001) respectively which was comparable to silymarin control 41.6 ± 3.1 IU/L (p<0.001). The normal mean value of AST 36.5 ± 3.6 IU/L was elevated to 101.2 ± 9.2 IU/L with paracetamol ingestion which was reduced to 41.8 ± 5.0 IU/L (p<0.001) and 40.6 ± 6.4 IU/L (p<0.001) with doses of 250 and 500 mg/kg of aqueous methanolic extract respectively. AST reduction is also comparable to that of silymarin control 39.8 ± 7.8 IU/L (p<0.001). The normal mean value of ALP 216.2 ± 10.0 IU/L increased by administration of paracetamol to 413.4 ± 21.8 IU/L. Aqueous methanolic extract 250 and 500 mg/kg brought the enzyme value of ALP to the 288.0 ± 10.1 IU/L (p<0.01) and 272.1 ± 11.2 IU/L (p<0.001) respectively which was comparable to the standard silymarin 266.4 ± 32.7 IU/L (p<0.01). Normal mean value of total bilirubin (TBR) in mice was raised from 0.9 ± 0.03 to 2.1 ± 0.2 g/dL by paracetamol administration. When these animals were treated with 250 and 500 mg/kg of aqueous methanolic extract the total bilirubin reduced to 0.2 ± 0.1 g/dL (p<0.01) and 0.9 ± 0.1 g/dL (p<0.01) respectively which were comparable to that of silymarin control 0.9 ± 0.1 g/dL (p<0.01). There were no significant differences in effects between two doses of the extract, except ALP values as shown in Table II.
Histopathological examination of liver sections also supports biochemical investigation as shown in Figure 2. (A) Normal liver cells (B) PCM ingestion cause inflamed and necrotic cells with marked sinusoidal constriction (C) and recovery of cells with silymarin (D, E). Recovery of cells were observed with both doses of extracts. Effects of aqueous methanolic extract can be compared with silymarin as both showing improvement in hepatocytes necrosis, inflammation, portal vein and sinusoidal constriction and ballooning. Necrotic, ballooned and inflamed are shown in Figure 2. These results demonstrate aqueous methanolic extract provides protection if pretreatment was administered to mice before paracetamol injection and significant hepatitis can be seen in livers where pretreatments of extract were not provided.
Figure 2: Histopathological pictures of (A) Normal hepatocytes (B) Paracetamol treated group, marked inflammation, necrosis, sinusoidal constrictions and ballooning (C) Silymarin treated group, improvement in necrosis, inflammation, ballooning and moderate dilatation of sinusoids (D) Extract 250 mg/kg treated group, mild inflammation ballooning and moderate sinusoidal dilatation (E) Extract 500 mg/kg treated group, moderated inflammation, mild ballooning, mild necrosis and moderate sinusoidal dilatation
Phytochemical screening of leaves of M. nigra revealed the presence of important phytoconsitutents as shown in Table III. Flavonoids are important compounds in plants and have previously reported to have hepatoprotective activity. In our study moderate amount of flavonoids was present in leaves of the plant. Qualitative determination of these flavonoids was conducted by HPLC analysis.
Table III:Phytochemical Screening of leaves of Morus nigra
| Active compounds | Leaves of Morus nigra |
|---|---|
| Phenols | ++ |
| Flavonoids | ++ |
| Saponins | + |
| Alkaloids | + |
| Resins | - |
| Tannins | - |
| Coumarines | - |
| Volatile Oils | - |
| Terpinoids | - |
| (+++) high amount after added of reagent immediately; (++) moderate amount after 5 min of reagent added; (+) low amount after 10 min of reagent added and (-) absent of active compound after 20 min | |
The results of HPLC chromatogram can be compared with standard retentions times according to Saddiqeet al., 2011. Aqueous methanolic extract of M. nigra showed presence of luteolin (1.96 min), quercetin (2.05 min) and isorhamnetin (2.74 min) as shown in the Figure 3.
Figure 3: HPLC Chromatogram of aqueous methanolic extract of Morus nigrashowing presence of quercetin, luteolin and isorhamnetin
Discussion
nigra is popular and widely distributed specie of Moraceae family. In this study hepatoprotective activity of leaves of M. nigra was evaluated by using mice as experimental animals. Aqueous methanolic extract of M. nigrawith 250 mg/kg reduces elevated ALT by 55% (p<0.001), AST by 59% (p<0.001), ALP by 30% (p<0.01) and TBR by 54% (p<0.01) as compared to paracetamol control. At 500 mg/kg dose, elevated ALT reduced by 60% (p<0.001), AST by 60% (p<0.001), ALP by 34% (p<0.001) and TBR by 54% (p<0.01) as compared to paracetamol control. There is insignificant (p>0.05) difference between two doses with exception of ALP whose reduction is higher with 500 mg/kg (p<0.001) as compared to 250 mg/kg (p<0.01). These results are also comparable to that of silymarin (p<0.001, as compared to paracetamol control). Hepatoprotective potential of M. nigra might be due to presence of flavonoids, phenols and saponins; the phytoconstituents determined by phytochemical screening. It has been documented that flavonoids have very important contribution for hepatoprotective action. Therefore, qualitative investigation of flavonoids was conducted through isocratic flow HPLC. The results of this qualitative investigation revealed the presence of luteolin, quercetin and isorhamnetin in aqueous methanolic extract of M. nigra. Luteolin (Domitrovićet al., 2009), isorhamnetin (Kim et al., 2012) and quercetin (Janbazet al., 2004), all are famous for its antioxidant and hepatoprotective potential. Due to its edible nature, easy accessibility and economical factor, M. nigra can be a good source of active continents having tolerable potential for liver health.
This plant also contains alkaloids as shown in phyto chemistry of plant in our study. The alkaloids may be hepatotoxic at higher doses (Ali et al., 2013), so there is need to determine its dose for hepatoprotective action. The possible mechanism of action may be due to free radical scavenger and antioxidant activities of identified compound (An et al., 2005; Oh et al., 2004).
Conclusion
Previous traditional hepatoprective use, HPLC analysis and animal testing provide evidence that M. nigra has hepatoprotective activity against paracetamol-induced liver injury in mice.
Acknowledgements
Authors are thankful to Qaisar Mahmood and Asif Masud for their contribution to accomplish this study.
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