Evaluation of Hepatoprotective Effect of Hydroalcoholic Extract of Momordica Charantia Leaves in Carbon Tetrachloride-Induced Liver Toxicity in Wistar Rats.
Western medicine has little to give for hepatic disease therapy, and it is primarily plant-based preparation that is used to treat hepatic disorders. [6,7] Therefore, many folk remedies of plant origin are being evaluated for their possible hepatoprotective effects.
In ethnomedical practice, several medicinal plants and their preparations are used for hepatic diseases as well as the traditional system of medicine in India.  Herbs play a crucial role in managing different liver diseases. A variety of herbal preparations for hepatic disease treatment is suggested in Ayurveda due to the absence of secure and efficient hepatic protective medication in modern medicine. 
Momordica charantia (bitter melon) belongs to the family of Cucurbitaceae, which is a food as well as medicine. The plant possesses antimicrobial activity  and contains antioxidant compounds such as vitamin C, calcium, magnesium, sulphur and other trace elements.  Although Momordica charantia has been commonly used as folk medicine and health food, no scientific research has been reported on its in-vivo antioxidant efficacy to hepatic damage caused by carbon tetrachloride.
Different chemical-induced hepatotoxicity models were commonly used to investigate drug and plant extract hepatoprotective effects. In this study, we assessed Momordica charantia's hepatoprotective effect against carbon tetrachloride-induced liver damage in Wistar rats.
MATERIALS AND METHODS
For evaluation of the hepatoprotective activity of Momordica charantia; Thirty (30) Wistar rats of both sexes weighing between 150-200 gm body weight were used. The animals were obtained from the central animal house of SVS Medical college. Rats were kept in polypropylene cages provided with paddy husk bedding. Free access to food (standard pellets) and water ad libitum was provided to them. Under these conditions, the animals were acclimatized for a week with 12/12 hours of light and dark cycle.
Carbon tetrachloride (CCI4) a hepatotoxic drug was obtained from Accord lab's Hyderabad. Liquid paraffin used as a vehicle for this study was obtained from Prem lab's Hyderabad, India.
Liv-52 Liver tonic was used as a standard control and was manufactured by Himalaya Drugs Company, Bangalore, India. The test drug, Momordica charantia leaf hydroalcoholic extract (MCLHE), was obtained from Chemiloids Company, Vijayawada, India.
CC14 induced hepatotoxicity 8
Liver toxicity was induced in rats by administering CCI4 subcutaneously in a suspension of liquid paraffin (LP: CCL4=1:2 v/v) at a dose of 1 ml per kg body weight on alternate days for 7 days. [3,12]
Thirty (30) Wistar rats of either sex were divided into five (5) experimental groups (n=6 per group). Separate cages were allotted for each group and the cages were marked with the group number (I-V). The groups were as follows:
Group I: Rats were served as a control and got 1 ml/kg fluid paraffin (LP).
Group II: Ras received CCL4 (1:2 v/v).
Group III: Rats received Liv-52 orally (5 ml/kg) daily and CCL4.
Group IV and V: Extract of Momordica charantia (MCHLE) 100 and 200 mg/day respectively by oral route and CCL4. [13,14]
CCl4 administered in a suspension of liquid paraffin (1:2 v/v) at a dose of 1 ml per kg body weight. All the drugs administered via subcutaneous route for a week on alternative days.
Blood samples from the retro-orbital plexus were collected on the eighth day using heparinised capillary tubes. After the study period, animals were sacrificed by cervical dislocation through an incision made on the jugular vein and the liver tissues were collected and preserved in 10% formalin for histopathological study.
Blood samples were centrifuged, serum was collected and used for the estimation of biochemical parameters such as glutamate oxaloacetate transaminase (SGOT), serum glutamate pyruvate transaminase (SGPT) by MOD IFCC method,  serum alkaline phosphatase (ALP) by PNPP kinetic method and Total Bilirubin was estimated by Mod. Jendrassic and Groff's method.  All the kits were manufactured by crest Biosystems Goa--02, India.
In the present study, hydroalcoholic extract of Momordica charantia leaves was assessed for its hepatoprotective activity in carbon tetrachloride-induced hepatotoxicity in rats.
The serum glutamate oxaloacetate transaminase (SGOT) in control animals (Group I) varied from 50.11-58.11 with a mean of 53.57 [+ or -] 1.19 IU/L. This increased to 167.72[+ or -]5.57 IU/L after administration of CCL4 in Group II. In Group III, which received Liv-52 along with CCL4, the serum SGOT was reduced to 54.72 [+ or -] 0.83 IU/L. Whereas, with groups IV and V receiving Momordica charantia in doses of 100 and 200 mg/ kg respectively along with CCL4, serum SGOT decreased to 69.41 [+ or -] 2.35 and 60.72 [+ or -] 1.5 IU/L respectively. The effect of Momordica charantia in reducing the elevated levels SGOT as a result of CCL4 appeared to be slightly less than that of standard drug Liv-52.
The serum glutamate pyruvate transaminase (SGPT) in control animals varied from 31.01-41.30 IU/L with a mean value of 37.00 [+ or -] 1.77 IU/L. After administration of CCL4 to animals in group II, the SGPT raised to 118.16 [+ or -] 2.91 IU/L. In group III, the Liv-52 given to animals along with CCL4 reduced the SGPT levels to 61.41 [+ or -] 1.25 IU/L. The animals in groups IV and V receiving Momordica charantia in doses of 100 and 200 mg respectively, displayed reduced levels of SGPT to 47.92 [+ or -] 1.71 IU/L and 58.59 [+ or -] 1.81 IU/L respectively. When compared with Liv-52, Momordica charantia in both the test doses were found to be more effective in protecting the liver from CCL4 induced damage. Momordica charantia in a dose of 100 mg/kg was found to be more effective than 200 mg in reducing SGPT levels.
In the animals in Group I, the serum alkaline phosphatase (ALP) level was 165.44 [+ or -] 4.84 IU/L with a variation of 150.33-178.00 IU/L. CCL4 increased ALP levels to 281.33 [+ or -] 7.11 IU/L in animals in Group II. The level of ALP was reduced to 206.00 [+ or -] 6.95 IU/L in a Group III animals receiving Liv-52. The ALP levels were lowered to 190.62 [+ or -] 5.47 and 188.86 [+ or -] 2.5 IU/L in animals belonging to a Groups IV (100 mg/ kg Momordica charantia) and Group V (200 mg/ kg Momordica charantia). This suggests that the Momordica charantia's effect on ALP levels is slightly better than the effect of Liv-52.
The total bilirubin levels were elevated to 1.57 [+ or -] 0.1 mg/dl after CCL4 administration in Group II when compared to the normal value of 0. 71+ 0.66 mg/dl in Group I animals. The Liv-52 and Momordica charantia (100 mg/kg and 200 mg /kg) groups reversed the elevated levels of total bilirubin to very close to normal values i. e. 0.80[+ or -]0.2, 0.88 [+ or -] 0.02 & 0.77 [+ or -] 0.03 mg/dl respectively with p-values found to be significant, i.e. p <0.001.
Carbon tetrachloride is an experimental hepatotoxicant that is commonly used. Carbon tetrachloride's mechanism of action is complicated, multifactorial and not fully understood. Carbon tetrachloride, which is metabolized to free radical CCL3, accumulates in hepatic parenchymal cells. CCl4 is biotransformed into the trichloromethyl-free radicle (CCL3) that triggers lipid peroxidation by CYP2E1, CYP2 and possible CYP3A mechanism. These free radicals respond with molecular oxygen to generate peroxy radicals (H2O2, O2 and OH- owing to the incomplete decrease of molecular oxygen), which cause oxidative destruction of endoplasmic reticulum membrane lipids that are rich in polyunsaturated fatty acids and therefore damage the liver. [17-19] Carbon tetrachloride generates dose-dependent hepatotoxicity, causing lipid peroxidation directly in the liver. [18,20]
One of the main causes of hepatoxicity is lipid peroxidant degradation of biomembranes.  An increase in the serum concentrations of glutamate pyruvate transaminase (GPT) in chronic hepatic necrosis is accompanied by a rise in the rate of glutamate dehydrogenase (GDH), which is indicative of mitochondrial liver injury.  This is demonstrated by an elevation of the serum marker enzymes SGOT, SGPT, ALP in CCL4 treated rats. When liver cell plasma membrane is damaged, a range of enzymes in the cytosol will release into the blood; their evaluation is useful quantitative markers of the extent and type of hepatic cell damage.
In the present study, treatment with different doses of Momordica charantia extract (100 mg, 200 mg/kg orally) significantly reversed all such elevated marker enzymes such as SGOT, SGPT ALP, and total bilirubin, and the results obtained were comparable to those of the Liv-52 group treated.
The decrease in total bilirubin after one week of Momordica charantia administration suggests that it enhances bilirubin clearance. The quicker regression of raised transaminase values due to the treatment of Momordica charantia (100 mg, 200 mg) also suggests its hepatoprotective activity.
Liv-52's protective effects have been shown earlier in reducing lipid peroxidation in hepatotoxic conditions and are attributed to the action of Liv-52 in reducing tocopherol levels.  Although there is insufficient information to determine the mechanism of action of Liv-52 protection, this may be due to its antiperoxidant activity, which is either dependent on reduced production of radical CCL4 derivatives or its antioxidant action.
Several scientific reports indicated certain flavonoids, ascorbic acid, phenols, beta carotene, caffiec acid, catechin, and gallic acid, have a protective effect on the liver due to their antioxidant properties. [24,25] Presence of those compounds in Momordica charantia may be responsible for the protective effects on CCL4 induced liver damage.
The outcome of our research indicates that Momordica charantia's hepatoprotective activity may be similar to Liv-52 (l.o.c cit) owing to the reduced formation of CCL4 radical derivatives.
Momordica charantia is found to be hepatoprotective because it avoids lipid peroxidation or potentially irreversible binding of CCL4 to vital cellular proteins for its metabolism. In the present study, Momordica charantia leaf hydroalcoholic extract showed protection against CCL4 toxicity, as there is a significant reduction in all biochemical parameters. MCLHE 200mg / kg showed stronger hepatoprotective activity on CCL4-induced liver damage in rats than 100mg / kg. The plant extract's observed protective effects against carbon tetrachloride can be attributed to flavonoids, ascorbic acid, etc.
Carbon tetrachloride (CCL4) induces hepatic damage by causing lipid peroxidation due to its metabolite free radical CCL3. The Momordica charantia extract 200 mg/kg showed hepatoprotective activity in rats similar to Liv-52, probably because it contains flavonoids and other phytochemical agents. Further studies are needed to elicit the active component responsible for its hepatoprotective effect.
My sincere thanks to staff, Department of Pharmacology, BLDE (Deemed to be) University's Shri BM Patil Medical College for constant support. I am also thankful to Mr Gujarathi Bhairkadar animal house technician for constant help throughout my work.
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Gurudatta Moharir (1), Ambadasu Bharatha (2), Nkemcho Ojeh (3) and S. Vijay Prasad (4)
(1) Lecturer in Pharmacology, BLDE University's Shri BM Patil Medical College, Vijaypur, Karnataka, India.
(2) Lecturer in Faculty of Medical Sciences, The University of the West Indies, Cave Hill Campus, Barbados, WI.
(3) Senior Lecturer in Faculty of Medical Sciences, The University of the West Indies, Cave Hill Campus, Barbados, WI.
(4) Department of Pharmacology, Govt Medical College, Shivpuri, Madhya Pradesh, India.
(Received: 13 July 2019; accepted: 21 August 2019)
Table 1. Effect of Hydroalcoholic Extract of Momordica charantia leaves on serum enzymes and Total Bilirubin GROUP (n=6) SGOT (IU/L) SGPT (IU/L) Group I 53.57 [+ or -] 1.19 37.00 [+ or -] 1.77 Group II 167.72 [+ or -] 5.57 118.16 [+ or -] 2.91 Group III 54.72 [+ or -] 0.83 61.41 [+ or -] 1.25 Group IV 69.41 [+ or -] 2.35 47.92 [+ or -] 1.71 Group V 60.72 [+ or -] 1.5 58.59 [+ or -] 1.81 GROUP (n=6) ALP (IU/L) Total bilirubin (IU/L) Group I 165.44 [+ or -] 4.84 0.71 [+ or -] 4.84 Group II 281.33 [+ or -] 7.11 1.57 [+ or -] 0.1 Group III 206.00 [+ or -] 6.95 0.80 [+ or -] 0.2 Group IV 190.62 [+ or -] 5.47 0.88 [+ or -] 0.02 Group V 188.86 [+ or -] 2.53 0.77 [+ or -] 0.03 Data were presented as Mean [+ or -] SEM Table 2. Post ANOVA least significant difference chart Variables D.F t--value Std. Error Difference SGOT of Group III Vs II 10 20.46 5.63 SGPT of Group III Vs II 10 17.873 3.17 ALP of Group III Vs II 10 7.57 9.945 Total Bilirubin of Group III Vs II 10 0.804 0.112 SGOT of Group IV Vs II 10 16.245 6.051 SGPT of Group IV Vs II 10 20.75 3.383 ALP of Group IV Vs II 10 9.479 8.977 Total Bilirubin of Group IV Vs II 10 6.204 0.1118 SGOT of Group V Vs II 10 18.53 5.774 SGPT of Group V Vs II 10 17.33 3.435 ALP of Group V Vs II 10 12.245 7.551 Total Bilirubin of Group V Vs II 10 6.078 0.114 Variables p-value SGOT of Group III Vs II 0.001 SGPT of Group III Vs II 0.001 ALP of Group III Vs II 0.001 Total Bilirubin of Group III Vs II 0.001 SGOT of Group IV Vs II 0.001 SGPT of Group IV Vs II 0.001 ALP of Group IV Vs II 0.001 Total Bilirubin of Group IV Vs II 0.01 SGOT of Group V Vs II 0.001 SGPT of Group V Vs II 0.001 ALP of Group V Vs II 0.001 Total Bilirubin of Group V Vs II 0.01
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|Author:||Moharir, Gurudatta; Bharatha, Ambadasu; Ojeh, Nkemcho; Prasad, S. Vijay|
|Publication:||Biomedical and Pharmacology Journal|
|Date:||Sep 1, 2019|
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