Bangladesh Journal of Pharmacology Research Article Hepatoprotective activity of aqueous methanolic extract of Morus nigra against paracetamol-induced hepato- toxicity in mice BJP 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 microorga- nisms (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, anti-fertility, 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 hepato- protective 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 Shah-toot (Hindi/Urdu). Phar- macologically it has been reported that M. nigra is antioxidant (Ozgenet al., 2009), anti-nociceptive (Padil- haet 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). A Journal of the Bangladesh Pharmacological Society (BDPS) Bangladesh J Pharmacol 2014; 9: 60-66 Journal homepage: www.banglajol.info Abstracted/indexed in Academic Search Complete, Agroforestry Abstracts, Asia Journals Online, Bangladesh Journals Online, Biological Abstracts, BIOSIS Previews, CAB Abstracts, Current Abstracts, Directory of Open Access Journals, EMBASE/Excerpta Medica, Global Health, Google Scholar, HINARI (WHO), International Pharmaceutical Abstracts, Open J-gate, Science Citation Index Expanded, SCOPUS and Social Sciences Citation Index ISSN: 1991-0088 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 histopathologi- cal investigations, phytochemical screening and detection of active consti- tuents 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. Article Info Received: 8 January 2014 Accepted: 13 January 2014 Available Online: 7 February 2014 DOI: 10.3329/bjp.v9i1.17337 Cite this article: Mallhi TH, Qadir MI, Khan YH, Ali M. Hepatoprotective activity of aque- ous methanolic extract of Morus nigra against paracetamol-induced hepato- toxicity in mice. Bangladesh J Phar- macol. 2014; 9: 60-66. This work is licensed under a Creative Commons Attribution 3.0 License. You are free to copy, distribute and perform the work. You must attribute the work in the manner specified by the author or licensor. Hepatoprotective activity of aqueous methanolic extract of Morus nigra against paracetamol-induced hepatotoxicity in mice Tauqeer Hussain Mallhi1, M. Imran Qadir1, Yusra Habib Khan2 and Muhammad Ali3 1College of Pharmacy, GC University, Faisalabad, Pakistan; 2School of Pharmaceutical Sciences, University Sains Malaysia, Penang Pulau, Malaysia; 3Institute of Molecular Biology and Biotechnology, Bahauddin Zakariya University, Multan, Pakistan. 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). Tradi- tionally M. nigra is worthwhile to cure jaundice (Abbasiet al., 2009). Phytochemical profile and tradi- tional 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 Univer- sity, Local Nursery Farms from Faisalabad and identi- fied by Dr. Mansoor Hameed, Associate Professor, Department of Botany, University of Agriculture Faisa- labad. 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 commer- cial grinder. Powdered leaves were soaked in 8 L aque- ous methanol (70:30) for 7-10 days with occasional shak -ing. 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 stan- dardized pellet diet and water ad libitum. All the experi- mental methods and materials were reviewed and approved by supervisory committee of College of Pharmacy, GC University Faisalabad. Research was con -ducted 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 guide- lines. 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 paraceta- mol 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 Super- visory and Ethical committee for animal research of College of Pharmacy of Institute. All the animals were fasted for 12 hours and anesthe- tized 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 experi- ment (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 proce- dures (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 Hematoxy- lin and Eosin for nuclei and cytoplasm staining into blue/purple and pink respectively. Summary of metho- dology is shown in Figure 1. Phytochemical screening: The preliminary phytochemical screening of various active compounds were accom- plished by methods used by Farhanet al., 2012 where filtered ethanolic extract (70%) and powdered plant were used as shown in Table I. The results of phytochemical screening have been shown in Table II. Qualitative determination of flavor- noid contents were determined by HPLC analysis of aqueous methanolic extract used in this study. HPLC analysis for determination of phytoconstituents: For qualitative separation of compounds, SYKAM HPLC system was used equipped with S-1122 Solvent Deli- very 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 determina- tion 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 solu- tions were filtered by using 0.45 µm filters and further dilutions were made by adding methanol if needed. For Bangladesh J Pharmacol 2014; 9: 60-66 61 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 acidi -fied 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 com- pounds 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 ana- lysis. Results were represented as mean ± SE. 62 Bangladesh J Pharmacol 2014; 9: 60-66 Figure 1: Summary of study methodology 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 Terpe- noids 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 etha- nolic solvent added to 5 mL of KOH 50%. Then the two solutions A and B were mixed together Appearance of yellow color Results The normal ALT value 32.8 ± 2.1 IU/L elevated to 112.1 ± 4.2 IU/L by paracetamol intoxication. After adminis- tration 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 improve- ment 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 provi- des 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. 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 hepato- protective activity. In our study moderate amount of flavonoids was present in leaves of the plant. Quali- tative determination of these flavonoids was conducted by HPLC analysis. 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. Discussion M. 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 Bangladesh J Pharmacol 2014; 9: 60-66 63 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 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; (++) mod- erate amount after 5 min of reagent added; (+) low amount after 10 min of reagent added and (-) absent of active compound after 20 min 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 determin- ed by phytochemical screening. It has been documented that flavonoids have very important contribution for hepatoprotective action. Therefore, qualitative investiga -tion of flavonoids was conducted through isocratic flow HPLC. The results of this qualitative investigation revealed the presence of luteolin, quercetin and isorham -netin in aqueous methanolic extract of M. nigra. Lute- olin (Domitrovićet al., 2009), isorhamnetin (Kim et al., 2012) and quercetin (Janbazet al., 2004), all are famous for its anti-oxidant and hepatoprotective potential. Due to its edible nature, easy accessibility and economical factor, M. nigra can be a good source of active conti- nents having tolerable potential for liver health. This plant also contains alkaloids as shown in phyto- 64 Bangladesh J Pharmacol 2014; 9: 60-66 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 mod- erate dilatation of sinusoids (D) Extract 250 mg/kg treated group, mild inflammation ballooning and moderate sinusoidal dilata- tion (E) Extract 500 mg/kg treated group, moderated inflammation, mild ballooning, mild necrosis and moderate sinusoidal dila- tation 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. 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