Hepatoprotection with a chloroform extract of Launaea procumbens against CCl4-induced injuries in rats
© Khan et al.; licensee BioMed Central Ltd. 2012
Received: 11 July 2011
Accepted: 21 March 2012
Published: 3 August 2012
Launaea procumbens (Asteraceae) is used as a folk medicine to treat hepatic disorders in Pakistan. The effect of a chloroform extract of Launaea procumbens (LPCE) was evaluated against carbon-tetrachloride (CCl4)-induced liver damage in rats.
To evaluate the hepatoprotective effects of LPCE, 36 male Sprague–Dawley rats were equally divided into six groups. Animals of group 1 (control) had free access to food and water. Group II received 3 ml/kg of CCl4 (30% in olive oil v/v) via the intraperitoneal route twice a week for 4 weeks. Group III received 1 ml of silymarin via gavage (100 mg/kg b.w.) after 48 h of CCl4 treatment whereas groups IV and V were given 1 ml of LPCE (100 and 200 mg/kg b.w., respectively) after 48 h of CCl4 treatment. Group VI received 1 ml of LPCE (200 mg/kg b.w.) twice a week for 4 weeks. The activities of the antioxidant enzymes catalase, peroxidase (POD), superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), glutathione S-transferase (GST), glutathione reductase (GSR), glutathione (GSH) and lipid peroxidation (thiobarbituric acid reactive substances (TBARS)) were measured in liver homogenates. DNA damage, argyrophilic nucleolar organizer regions (AgNORs) counts and histopathology were studied in liver samples. Serum was analyzed for various biochemical parameters. Phytochemical composition in LPCE was determined through high-performance liquid chromatography (HPLC).
LPCE inhibited lipid peroxidation, and reduced the activities of aspartate transaminase, alanine transaminase, alkaline phosphatase, and lactate dehydrogenase in serum induced by CCl4. GSH contents were increased as were the activities of antioxidant enzymes (catalase, SOD, GST, GSR, GSH-Px) when altered due to CCl4 hepatotoxicity. Similarly, absolute liver weight, relative liver weight and the number of hepatic lesions were reduced with co-administration of LPCE. Phyochemical analyses of LPCE indicated that it contained catechin, kaempferol, rutin, hyperoside and myricetin.
These results indicated that Launaea procumbens efficiently protected against the hepatotoxicity induced by CCl4 in rats, possibly through the antioxidant effects of flavonoids present in LPCE.
KeywordsLaunaea procumbens Hepatic injuries Flavonoids Antioxidant enzymes Carbon tetrachloride
The liver takes part in the metabolism, detoxification and secretion functions in the body. It is the major target organ of chemical-induced toxicity. Liver damage in most cases involves oxidative stress and is characterized by progressive evolution from steatosis to chronic hepatitis, fibrosis, cirrhosis, and hepatocellular carcinoma. More than 50% of individuals in the United States suffer from liver disorders [1, 2]. Although the precise mechanisms of the pathogenesis of liver cirrhosis are incompletely understood, the role of free radicals and lipid peroxides has garnered considerable attention . It has been found that the metabolism of carbon tetrachloride (CCl4) involves production of the highly lethal trichloromethyl radical (·CCl3) and peroxy trichloromethyl (·OOCCl3) free radical through activation by drug-metabolizing enzymes located in the endoplasmic reticulum [4, 5]. CCl4 can cause lipid peroxidation as well as deposition of the extracellular matrix (ECM), resulting in liver cirrhosis [6, 7]. Clinical and experimental examinations have shown that cirrhosis can be reversed. Various pharmaceutical drugs have been used to minimize and reverse the insult, but most of them lead to appreciable side-effects during long-term treatment. In this context, the use of an effective alternative without side-effects is crucial to reduce the oxidative stress which leads to hepatic disorders [8, 9]. Currently, there is great awareness of the health benefits of phenolic and polyphenolic compounds because of their antioxidant potential [10–12]. Dietary plants possessing phenolic and polyphenolic compounds have been shown to exert various biological actions. These include the scavenging of free radicals, metal chelation, increases in enzymatic activity. More recently, they have been shown to influence signal transduction, release of transcription factors, and gene expression. They have received considerable attention in the past decade because of their reputed role in the prevention of several human disorders .
Medicinal plants possess quantities of phenolic and polyphenolic constituents, and are also in demand for use as functional foods or biopharmaceutical products. Launaea procumbens (LP) is an important medicinal plant used extensively in Ayurvedic and herbal medicine in Pakistan (which promotes self-remedy, good health and longevity) as well as being used as a food ingredient . Traditionally, it has been used in the treatment of kidney disorders, hormonal imbalance and sexual diseases . According to Shaukat et al.  the ethanolic extracts of LP have been used against pathogenic fungi. Chemical characterization has revealed that LP is composed of salicylic acid, vanillic acid, synergic acid, 2-methyl-resorcinol and gallic acid  as well as phenolic and polyphenolic compounds . These compounds have spasmogenic, cardiovascular, anti-carcinogenic, anti-inflammatory, hepatoprotective and antioxidant properties . The present study was designed to screen the chloroform fraction of LP for phytochemical composition using high-performance liquid chromatography (HPLC) as well as to evaluate its hepatoprotective potential against CCl4-induced hepatotoxicity.
Ethical approval of the study protocol
The study protocol was approved by an Ethics Committee of Quaid-i-Azam University for the Feeding and Care of Laboratory Animals.
LP was collected from Wah Cantonment in the district of Rawalpindi (Pakistan) at maturity during June 2006. It was identified and a specimen submitted at the Herbarium of Pakistan (Quaid-i-Azam University, Islamabad, Pakistan). Aerial parts of the plant (leaves, stem, flowers, seeds) were dried in the shade at room temperature for 2 weeks. They were then chopped and ground mechanically to a mesh size of 1 mm.
Preparation of plant extract
A total of 1.5 kg powder of LP was extracted with 2 L of absolute methanol in a separating funnel with refluxing for 5 h. The extract was cooled at room temperature, filtered, and evaporated under reduced pressure in a rotary evaporator. It was suspended in distilled water and fractionated with n-hexane, ethyl acetate and chloroform. The chloroform fraction of Launaea procumbens (LPCE) was dried and stored at 4°C for in-vivo studies.
HPLC of LPCE
A total of 500 mg of LPCE was extracted with 6 ml of 25% hydrochloric acid and 20 ml of chloroform for 1 h. The obtained extract was filtered to a volumetric flask. The residue was heated twice with 20 ml of chloroform for 20 min to obtain the extract. The combined extract was diluted with chloroform to 100 ml. A 5-ml portion of the solution was filtered and transferred to a volumetric flask and diluted with 10 ml of chloroform. The sample (10 μl) was injected into the HPLC apparatus. Samples were analyzed on an Agilent HPLC system (Agilent, Santa Clara, CA, USA). Separation was carried out through a 20RBAX Eclipse XDB-C18 column (5 μm; 4.6 × 150 mm, Agilent) with a ultraviolet–visible (UV–vis) Spectra-Focus detector with an autosampler. Solvent A (0.05% trifluoroacetic acid) and solvent B (0.038% trifluoroacetic acid in 83% acetonitrile (v/v) were employed with the following gradient: 0–5 min, 15% B in A, 5–10 min, 50% B in A, 10–15 min, 70% B in A. The flow rate was 1 ml/min and the injection volume was 10 μl. Six standard compounds (myricetin, catechin, vitexin, kaempferol, hyperoside, rutin) were run for comparative detection and optimized. Calibration curves were defined for each compound in the range of sample quantity 0.02–0.5 μg. All samples were assayed in triplicate. All quantitative data were evaluated using analytic software.
Thirty-six male Sprague–Dawley ratss (age, 6 weeks; 190–200 g) were provided by the National Institute of Health (Islamabad, Pakistan). They were kept in standard cages at room temperature (25 ± 3°C) with a 12-h dark–light cycle. They were allowed to consume standard laboratory food and water.
To study the antioxidant possessions of LP, rats were equally divided into six groups. Group 1 (control) have free access to food. Group II received 3 ml/kg of CCl4 (30% in olive oil) via the intraperitoneal route twice a week for 4 weeks. Group III received silymarin 100 mg/kg body weight (b.w.) via the oral route after 48 h of CCl4 treatment. Groups IV and V were given 100 mg/kg b.w. and 200 mg/kg b.w. LPCE, respectively, after 48 h of CCl4 treatment as described above, while group VI received only LPCE at 200 mg/kg b.w. for 4 weeks. Twenty-four hours after the last treatment, all rats were weighed and their blood collected; they were then killed. Livers were removed, weighed, and perfused in ice-cold physiological (0.9%) saline solution. Half of the liver was reated with liquid nitrogen for enzymatic and DNA-damage analyses, whereas the other portion was processed for histological analyses.
Assessment of levels of liver marker enzymes and biochemical parameters
Serum analyses of various liver marker enzymes alanine transaminase (ALT), aspartate transaminase (AST), alkaline phosphatase (ALP), gamma-glutamyl transpeptidase (γ-GT), lactate dehydrogenase (LDH)), total cholesterol (TC), high-density lipoprotein- cholesterol (HDL-C), low-density lipoprotein-cholesterol (LDL-C) and triglycerides (TGs) were estimated using standard AMP Diagnostic Kits (Graz, Austria).
Assessment of levels of antioxidant enzymes
Hepatic tissues were homogenized in 10 volumes of 100 mmol KH2PO4 buffer containing 1 mmol ethylenediamine tetra-acetic acid (EDTA; pH 7.4) and centrifuged at 12,000 × g for 30 min at 4°C. The supernatant was collected and used for the assessment of antioxidant enzymes. Protein concentrations in the supernatants of liver tissue homogenates were determined using crystalline bovine serum albumin (BSA) as a standard. All chemicals used in enzymatic analyses were purchased from Sigma–Aldrich (St Louis, MO, USA).
Catalase activity was determined using the method of Chance and Maehly  with some modifications. The reaction solution of catalase activity contained 2.5 ml of 50 mmol phosphate buffer (pH 5.0), 0.4 ml of 5.9 mmol H2O2 and 0.1 ml of hepatic supernatant. Changes in the absorbance of the reaction solution at 240 nm were determined after 1 min. One unit of catalase activity was defined as an absorbance change of 0.01 as units/min.
Superoxide dismutase (SOD) assay
The SOD activity of liver tissue was estimated using the method of Kakkar et al. . he reaction mixture contained 0.1 ml of phenazine methosulfate (186 μmol), 1.2 ml of sodium pyrophosphate buffer (0.052 mmol; pH 7.0), 0.3 ml of the supernatant after centrifugation (1500 × g for 10 min followed by 10,000 × g for 15 min). The enzyme reaction was initiated by adding 0.2 ml of NADH (780 μmol) and stopped after 1 min by the addition of 1 ml of glacial acetic acid. The amount of chromogen formed was measured by recording color intensity at 560 nm. Results are expressed in units/mg protein.
Glutathione-S-transferase (GST) assay
GST activity was assayed using the method of Habig et al. . The reaction mixture consisted of 1.475 ml of phosphate buffer (0.1 mol, pH 6.5), 0.2 ml of reduced glutathione (1 mmol), 0.025 ml of CDNB (1 mmol) and 0.3 ml of homogenate in a total volume of 2.0 ml. Changes in absorbance were recorded at 340 nm, and GST activity was calculated as nmol CDNB conjugate formed/min/mg protein using a molar extinction coefficient of 9.6 × 103 M–1 cm–1.
Glutathione Reductase (GSR) assay
GSR activity was determined using the method of Carlberg and Mannervik . The reaction mixture consisted of 1.65 ml of phosphate buffer: (0.1 mol; pH 7.6), 0.1 ml of EDTA (0.5 mmol), 0.05 ml of oxidized glutathione (1 mmol), 0.1 ml of nicotinamide adenine dinucleotide phosphate (NADPH) (0.1 mmol) and 0.1 ml of homogenate in a total volume of 2 ml. Enzyme activity at 25°C was estimated by measuring the disappearance of NADPH at 340 nm. It was calculated as nmol NADPH oxidized/min/mg protein using a molar extinction coefficient of 6.22 × 103 M–1 cm–1.
Glutathione peroxidase (GSH-px) assay
GSH-Px activity was assayed using the method of Mohandas et al. . The reaction mixture consisted of 1.49 ml of phosphate buffer (0.1 mol; pH 7.4), 0.1 ml of EDTA (1 mmol), 0.1 ml of sodium azide (1 mmol), 0.05 ml of GSR (1 IU/ml), 0.05 ml of reduced glutathione (GSH; 1 mmol), 0.1 ml of NADPH (0.2 mmol), 0.01 ml of H2O2 (0.25 mmol) and 0.1 ml of homogenate in a total volume of 2 ml. The disappearance of NADPH at 340 nm was recorded at 25°C. Enzyme activity was calculated as nmol NADPH oxidized/min/mg protein using a molar extinction coefficient of 6.22 × 103 M–1 cm–1.
Quinone Reductase (QR) assay
The activity of QR was determined using the method of Benson et al. . The 3-ml reaction mixture consisted of 2.13 ml of Tris–HCl buffer (25 mmol; pH 7.4), 0.7 ml of BSA, 0.1 ml of FAD, 0.02 ml of NADPH (0.1 mmol) and 0.l ml of homogenate. The reduction of dichlorophenolindophenol (DCPIP) was recorded at 600 nm. Enzyme activity was calculated as nmol of DCPIP reduced/min/mg protein using a molar extinction coefficient of 2.1 × 104 M–1 cm–1.
GSH was estimated using the method of Jollow et al. . A total of 1.0 ml of homogenate was precipitated with 1.0 ml of 4% sulfosalicylic acid. Samples were kept at 4°C for 1 h and then centrifuged at 1200 × g for 20 min at 4°C. The total volume of 3.0 ml assay mixture contained 0.1 ml of a filtered aliquot, 2.7 ml of phosphate buffer (0.1 mol; pH 7.4) and 0.2 ml of DTNB (100 mmol). The yellow color that developed was read immediately at 412 nm on a SmartSpec™ Plus Spectrophotometer (Bio-Rad, Hercules, CA, USA). It was expressed as μmol GSH/g tissue.
Estimation of lipid peroxidation using levels of thiobarbituric acid reactive substances (TBARS)
The assay for lipid peroxidation was carried out using a modified method of Iqbal et al. . One milliliter of 20% TCA aqueous solution and 1.0 ml of 0.67% TBA aqueous solution was added to 0.6 ml of phosphate buffer (0.1 M; pH 7.4) and 0.4 ml of homogenate sample. The reaction mixture was heated in a boiling water-bath for 20 min and then moved to a bath of crushed ice before centrifugation at 2500 × g for 10 min. The amount of TBARS formed in each of the samples was assessed by measuring the optical density of the supernatant at 535 nm using a spectrophotometer against a reagent blank. Results were expressed as nmol TBARS/min/mg tissue at 37°C using a molar extinction coefficient of 1.56 × 105 M–1 cm–1.
A nitrite assay was conducted using Griess reagent. Tissue was deproteinized using equal volumes of 0.3 mol NaOH and 5% ZnSO4, and centrifuged at 6400 × g for 20 min, and the supernatant collected. A total of 1.0 ml of Griess reagent was added into the cuvette, and the spectrophotometer blanked at 540 nm. Then 20 μl of supernatant was added in a cuvette containing Griess reagent. Nitrite concentration was calculated using a standard curve for sodium nitrite.
DNA fragmentation assay
DNA ladder assay
DNA was isolated using the methods of Wu et al.  to estimate DNA damage. A 5-μg aliquot of DNA of rats was separately loaded in 1.5% agarose gel containing 1.0 μg/ml of ethidium bromide, including DNA standards (0.5 μg per well). Electrophoresis was done for 45 min at 100 V. After electrophoresis, gels were studied under a Gel Doc system and photographed using a digital camera.
Argyrophilic nucleolar organizer regions (AgNORs) counts
A silver staining technique was used according to the methods of Trere et al. . Unstained fixed slides were dewaxed by dipping for 3 min in xylene and were hydrated in decreasing ethanol concentrations (90%, 70% and 50%). After drying, slides were treated with one drop of colloidal solution (2% gelatin and 1% formic acid) and two drops of 50% AgNO3 solution onto the slides and incubated at 35°C for ≈8–12 min. Progressive staining was followed under a light microscope (Dialux 20 EB, Leitz, Wetzlar, Germany) to obtain golden-colored nuclei and brown/black NORs. Then, slides were washed in distilled water, treated for 1 min with 1% sodium thiosulfate at room temperature to stop the reaction, and washed in tap water. Cells were examined under a light microscope at 100 × magnification and the number of AgNORs per cell counted.
For microscopic evaluation, liver samples were fixed in a fixative (absolute alcohol 60%, formaldehyde 30%, glacial acetic acid 10%) and embedded in paraffin, sectioned at 4-μm thickness, and subsequently stained with hematoxylin and eosin (H&E). Sections were studied under a light microscope at 40 × magnification. Slides of all treated groups were photographed and studied.
To determine the treatment effects, one-way analysis of variance was carried using SPSS 13.0 computer software (SPSS, Chicago, IL, USA). The level of significance among the various treatments was determined by least squares difference (LSD) analyses at 0.05% and 0.01% levels of probability.
HPLC quantification of flavonoids
Calibrations of standards
Linear range (ppm)
HPLC quantification of various flavonoids of chloroform extract of L. procumbens
Effect of LPCE on body weight, liver w ight and AgNORs
Effects of LPCE on body weight, liver weight, relative weight, DNA damages and AgNORS
Liver weight (g)
Relative liver weight (% to body weight)
% Change in Body weight
DNA damages %
3 ml/kg CCl4
100 mg/kg Silymarin+ CCl4
100 mg/kg LPCE+CCl4
200 mg/kg LPCE alone
Effect of LP on cholesterol profile
Indices of hepatotoxicity: liver marker enzymes
Effect of LPCE on liver marker enzymes
LDH (nM/min/ mg protein)
3 ml/kg CCl4
100 mg/kg Silymarin+ CCl4
100 mg/kg LPCE+CCl4
200 mg/kg LPCE alone
Effect of the plant extract on parameters of oxidative stress in the liver
Effect of LPCE on hepatic oxidative stress parameters
SOD (U/mg protein)
GST (nmol/ min/mg protein)
GSH-Px (nmol/ min/mg protein)
GSR (nmol/ min/mg
QR (nmol/ min/mg protein)
3 ml/kg CCl4
100 mg/kg Silymarin+ CCl4
100 mg/kg LPCE+CCl4
200 mg/kg LPCE alone
Effects of LPCE on levels of TBARS, GSH and nitrite
LPCE effects on TBARS, GSH and nitrite concentration of rat
GSH (mol/g tissue)
TBARS (nmol/min/mg protein)
3 ml/kg CCl4
100 mg/kg Silymarin+ CCl4
100 mg/kg LPCE+CCl4
200 mg/kg LPCE alone
Effect of LPCE on DNA damage
Effect of LPCE on hepatic histoarchitecture
Effect of LPCE on histology of liver
Cellular hypertrophy and necrosis
Blood vessel congestion
Degeneration of lobules
Inflammatory cell infiltrations
3 ml/kg CCl4
100 mg/kg Silymarin+ CCl4
100 mg/kg LPCE+CCl4
200 mg/k g LPCE alone
Dietary polyphenols and phenolic compounds are considered to have health-promoting effects in humans. The biological properties of these plant constituents are dependent upon their absorption in the intestine [29, 30] and have been reviewed recently . The HPLC data of the present study revealed that LPCE possesses five important polyphenolic compounds (myricetin, kaempherol, rutin, hyperoside, catechin) which have a unique role in detoxification . Studies have revealed the presence of the same phytochemicals during HPLC characterization of medicinal plants [33, 34]. Studies have also indicated that flavonoids are potent antioxidant agents . Hence, natural antioxidants such as polyphenols are often added to foods to stabilize them, and there is considerable interest in their potential role as functional foods or “nutraceuticals” .
Analyses of liver damage in the present study revealed that CCl4 is a potent hepatotoxin and is used extensively for the characterization of hepatoprotective drugs . Poisoning by CCl4 causes multisystem disorders involving the liver, kidneys, brain, lungs, adrenal glands, and myocardium . Single exposure of CCl4 can rapidly lead to severe centrizonal necrosis and steatosis, and affects the activity of biochemical enzymes, causes breakage of DNA strands, and increases telomerase activity . The results of the present study revealed that CCl4 administration caused hepatic injury which caused an elevation of levels of serum marker enzymes such as ALT, AST, ALP, γ-GT and LDH. CCl4 administration was shown to cause severe acute liver damage in rats as demonstrated by significant elevation of serum levels of AST and ALT [40, 41]. These enzymes were significantly restored by treatment with LPCE, thereby revealing its hepatoprotective ability. High levels of LDL-C and a lower concentration of HDL-C were strongly associated with hepatotoxicity and cardiovascular disease because these biomolecules promote atheroma development in arteries. Presence of significantly higher serum concentrations of LDH, TGs, TC and LDL and decreased levels of HDL-C upon co-treatment with various doses of LPCE demonstrated the hepatoprotective effect of LP. Similar results were reported by Sreelatha et al.  while working on the hepatoprotective effects of bioactive compounds of plants against CCl4-induced hepatic injury in rats.
SOD, catalase and GSH-Px constitute a “mutually supportive team” of antioxidant defense against ROS . Administration of CCl4 into rat livers increased lipid peroxidation, resulting in accumulation of superoxide radicals and consequently decreased their activities in the liver . Our data revealed that CCl4 treatment significantly decreased the activities of catalase, SOD, GSH-Px, GSR and QR in liver tissues. Co-administration of various doses of LPCE markedly decreased the toxicity of CCl4 and enzymatic activities. The ameliorating effects of different plant metabolites on these enzymes against the toxicity of CCl4 have also been documented . It has been accepted that the injuries induced by CCl4 are attributed to its conversion into the highly toxic CCl3 · and ·OOCCl3 by the phase-I cytochrome P450 system in tissues. These free radicals can bind with PUFAs to produce alkoxy (R·) and peroxy (ROO·) radicals that, in turn, generate lipid peroxide and hydroperoxide, which cause damage to cell membranes and various liver diseases . Elevation of TBARS the end and main oxidative degradation product of lipid peroxidation, functions as a marker of oxidative injury of cellular membranes resulting during the peroxidation of PUFA while a reduction of GSH is an important protein thiol is an important indicator of oxidative stress . GSH acts as a non-enzymatic antioxidant that reduces the toxicity due to H2O2, hydroperoxides (ROOH) and xenobiotics [48, 49]. The data of the present study showed that CCl4 significantly decreased GSH contents and increased TBARS contents as compared with the control. Administration of LPCE significantly increased GSH contents and reduced TBARS contents, and this could be due to the presence of various flavonoids in LPCE. Similar results have been reported after the co-administration of propolis against oxidative stress caused by CCl4. Lipid peroxidation induced by the free radicals of CCl4 combine with DNA to form adducts [17, 51]. Our results showed that the DNA of rats in the CCl4 group had more damage (as assessed by quantitative means) as compared with the control group. Administration of LPCE significantly reduced the % DNA fragmentation as revealed by the banding pattern of the DNA ladder assay. Similar results have been reported by Khan et al.  while studying the protective effects of Digera muricata against CCl4-induced nephrotoxicity in rats. Histopathological studies revealed that CCl4 induces: extensive fatty changes; congestion in blood vessels; cellular hypertrophy; necrotic foci; destruction of lobular architecture; fibrosis; and nuclear degeneration in certain areas. These were markedly diminished by administration of LPCE. These data are in good agreement with the activities of serum aminotransferases and hepatic lipid peroxidation levels. Other authors have revealed findings which are in agreement with our findings  while evaluating the protective effect of medicinal plants against CCl4-induced hepatotoxicity in rats.
The present study revealed that LPCE recovered enzyme activities in the liver, improved DNA fragmentation, and improved cellular injuries. This study provided evidence in favor of the pharmacological use of LPCE as herbal medicine in the treatment of liver disorders. The presence of antioxidant compounds (catechin, kaempferol, rutin, hyperoside, myricetin) may be responsible for the effectiveness of LPCE against liver disorders.
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