Protective efficacy of natansnin, a dibenzoyl glycoside from Salvinia natans against CCl4 induced oxidative stress and cellular degeneration in rat liver
© Srilaxmi et al; licensee BioMed Central Ltd. 2010
Received: 14 July 2009
Accepted: 12 October 2010
Published: 12 October 2010
Carbon tetra chloride (CCl4), an industrial solvent, is a hepatotoxic agent and it is the well established animal model for free radical-induced liver injury. The present investigation was carried out to establish the protective effect of natansnin, a novel dibenzoyl glycoside from Salvinia natans against CCl4 induced oxidative stress and cellular degeneration in rat liver.
CCl4 significantly increased the levels of lipid peroxides, oxidized glutathione and decreased the levels of reduced glutathione, SOD and CAT. CCl4 induce marked histopathological changes and increase in the levels of apoptotic proteins. CCl4 treatment significantly increased the levels of apoptotic proteins such as caspases-3, PARP, Bax, Bid and cytochrome C and also increased the levels of inflammatory mediators iNos and Cox-2. Natansnin treatment significantly decreased the levels of CCl4 induced apoptotic proteins and inflammatory mediators. Further natansinin treatment significantly inhibited the CCl4 induced apoptosis which was evident form the reduced TUNEL positive cells.
In conclusion, our study demonstrated the protective effect of natansnin against CCl4 induced oxidative stress and cellular degeneration in rat liver tissue. This protective effect of natansnin can be correlated to its direct antioxidant effect.
According to World Health Organization (WHO) more than 80% of the world's populations in developing countries depend primarily on herbal medicine for basic healthcare needs . Salvinia natans is a free floating, rootless aquatic fern and belongs to the family Salvinaceae. Ferns of the genus Salvinia comprise of ten species; majority of which grow in freshwater bodies of tropical and subtropical regions, mainly in Africa and South America . Salvinia varieties have small hairs on their leaves, making them water resistant. Air cavities in the leaves help the tiny plant to stay afloat. For many years, aquatic plants were used as an effective strategy for decontaminating waste water. Salvinia natans was found to have a great potentiality for the removal of heavy metals like lead (Pb), cadmium (Cd), nickel (Ni), copper (Cu), chromium (Cr) and mercury (Hg) from waste water. The understanding of chemistry of Salvinia plants can help controlling their invasive growth, and promote their utilization for useful purposes . The phytochemical investigation on S. natans showed that it consists of 96% of amino compounds . Though it is used in Homeopathy and other systems of medicine, no reports on medicinally important phytochemical compounds isolated from Salvinia natans. Several reports indicate that there is an inverse relationship between the dietary intake of antioxidant-rich foods and the incidence of human diseases [5, 6]. Hence search for new synthetic and natural antioxidants is essentially important. For the present study, the plants were collected from the Chidambaram area of TamilNadu, India. Plants were collected in the month of November, 2005. Prof. R. Pannerselvam, Department of Botany, Annamalai University, Annamalai Nagar 608 002, TamilNadu, India, identified the plant. Herbarium of the Department of Botany, Annamalai Nagar 608 002, Tamil Nadu, India. Herbarium sheet number is 670. In the present study, natansnin, a dibenzoyl glycoside was isolated from S.natans and found to have antioxidative properties.
CCl4 is a common industrial solvent which is well-known for its hepatotoxicity [7–9]. CCl4 is commonly used for free radical induced liver injury. Liver is not the only target organ of CCl4 but it also effect several organs like kidneys, lungs, heart, testis, brain and blood [10–12]. Through the investigation of acute CCl4 induced liver damage in animal models, it is now generally accepted that CCl4 toxicity results from bioactivation of CCl4 into trichloromethyl free radical by cytochrome P450 system in liver microsomes and consequently causes lipid peroxidation of membranes that leads to liver injury [13–15]. Lipid peroxidation initiated by free radicals is considerably deleterious for cell membranes and implicated in a number of pathological conditions. In the present study we examined the protective efficacy of natansnin isolated from Salvinia natans against CCl4 induced oxidative stress and cellular degeneration in rat liver.
Isolation of compounds from Salvinia natans
Secondary plant products are isolated from Salvinia natans using column chromatography. A total of five compounds (fatty acid, simple benzaldehyde, triterpenoid and two glycosides) were obtained from whole plants of Salvinia natans and their chemical structures characterized. One of the glycoside was identified as an unusual, novel, 1, 2- dibenzoyl glycoside after structural elucidation. The molecular formula was determined as C20 H20 O13 with a molecular weight of 468. The compound is named as natansnin. Isolation, purification and structural elucidation of natansnin accepted in journal of Natural products research. The article is in the press. (An unusual novel anti-oxidant dibenzoyl glycoside from Salvinia natans by M. Narasimhulu, K. Ashalatha P. Sri Laxmi, A. V. S. Sarma, B. Rama Rao, P.B. Kavi Kishor, G. L. David Krupadanam, A. Zehra Ali, Asok K. Tiwari, A. Panneer Selvam and Y. Venkateswarlu).
Effect of natansnin on DPPH* radical scavenging activity
% inhibition of radical scavenging activity
Butylated hydroxy toluene (BHT)
The effect of administration of CCl4 on oxidative stress and cellular degeneration and the protective effect of natansnin on CCl4 induced toxicity were studied. Results of all the parameters in this study were expressed relative to control, which was taken as 100. The actual values for control group are given in the corresponding figures. In other words a 100% protection (on a given parameter) means that the value is back to the control level which is normalized as 100.
Natansnin reduced the levels of serum enzymes induced by CCl4
Effect of natansnin on levels of serum enzymes induced by CCl4
238.26 ± 22.2a
244.82 ± 18.6a
Natansnin (20 mg/kg body wt)
108.26 ± 11.7
114.13 ± 10.9
Natansnin 10 mg + CCl4
173.45 ± 16.2a, b
162.27 ± 14.5a, b
Natansnin 20 mg + CCl4
165.61 ± 15.3a, b, c
145.61 ± 13.6a, b, c
Natansnin reduced lipid peroxidation induced by CCl4
Natansnin restored GSH/GSSG ratio
GSH (μ mol/gm tissue)
GSSG (μ mol/gm tissue)
32.12 ± 2.6
11.3 ± 0.71
16.7 ± 1.05
19.6 ± 1.11
30.03 ± 2.4
11.5 ± 0.85
Natansnin (10 mg) + CCl4 treated
26.8 ± 1.7
14.7 ± 0.9
Natansnin (20 mg) + CCl4 treated
28.1 ± 1.91
14.1 ± 0.81
Natansnin restored activities of antioxidant enzymes: catalase and superoxide dismutase
Natansnin restored cellular degeneration induced by CCl4
Natansnin reduced the levels of apoptotic and inflammatory proteins
CCl4 induced liver injuries are the best characterized system of xenobiotic-induced hepatotoxicity and for the screening of anti-hepatotoxic or hepatoprotective activities of drugs . To our knowledge, this is the first study to demonstrate that prior administration of natansnin ameliorated CCl4-induced acute liver injury in rats as evidenced by both oxidative, cellular degeneration and cell death parameters mentioned above. Indeed, several natural products were reported with their protective efficacy against CCl4-induced hepatotoxicity . The medicinal herbs Artemisia campestris and Phyllanthus fraternus have been found to scavenge free radicals and therein to exert a hepatoprotective effect against CCl4-induced liver injury. Free radicals, from both endogenous and exogenous sources, are implicated in the etiology of several degenerative diseases such as coronary artery disease, stroke, rheumatoid arthritis, diabetes and cancer .
The basis of CCl4 hepatotoxicity lies in its biotransformation by the cytochrome P-450 system to two free radicals. The first metabolite, a trichloromethyl free radical (.CCl3)  has been formed from the metabolic conversion of CCl4 and reacts very rapidly with O2 and forms a second metabolite, a trichloromethyl peroxy free radical (CCl3OO)  or abstract hydrogen atoms to form chloroform. These free radicals initiate the peroxidation of membrane poly-unsaturated fatty acids and covalently bind to microsomal lipids and proteins . This phenomenon results in the generation of ROS like the superoxide anion O2-, H2O2 and the hydroxyl radical, .OH. ROS affect the antioxidant defense mechanisms, decrease the intracellular concentration of reduced glutathione (GSH) and reduces the activity of SOD and CAT.
In the present study, it was observed that intoxication of male Wister rats with CCl4 caused a marked rise in the level of serum enzymes like ALT and ALP, lipid peroxides and oxidized glutathione and caused significant decrease in GSH, SOD and CAT activities in liver. Prior treatment with natansnin displayed a profound effect. Lipid peroxidation leading to cell membrane damage is known to occur in CCl4 induced hepatotoxicity . Membrane lipid peroxidation is an important pathophysiological event in a variety of diseases and stress conditions. MDA is a major reactive aldehyde produced from the peroxidation of polyunsaturated fatty acid present in the biological membranes . It was hypothesized that CCl4- induced hepatotoxicity is mainly due to the lipid peroxidation of hepatocyte membranes by free radical derivatives of CCl4. The observation of elevated levels of hepatic MDA in Group 3 rats (administered with CCl4 alone) in the present study is consistent with this hypothesis. Natansnin at both concentrations brought down the elevated lipid peroxides which is of great value and provide an additional support to suggest the hepato-protective role of natansnin.
Mitochondrial GSH depletion may compromise mitochondrial function and sensitizes cells to diverse oxidant-induced toxicity, leading to cell death . Liver injury included by consuming alcohol, by taking drugs like acetaminophen  or toxic chemicals like CCl4 are all known to be correlated with low tissue levels of GSH. In our study we observed a fall in the levels of reduced glutathione (GSH) and a rise in levels of oxidized glutathione (GSSG) in CCl4 challenged rats which are consistent with the results of other workers. Prior treatment of natansnin at both concentrations increased the levels of GSH and decreased the levels of GSSG when compared to CCl4 treated rats and these are close to the values obtained in controls. The ratio of GSH/GSSG is significantly restored in natansnin treated rats. Natansnin displayed hepatoprotection in natansnin treated rats with its antioxidant activity. In rats receiving CCl4 and natansnin, the activities of CAT and SOD were significantly higher than in CCl4 challenged rats, and are very similar to the values noted in normal rats. This suggests a hepatoprotective efficacy of natansnin, which is an interesting finding. The compound possibly confers this protective effect by diminishing the generation of free radicals induced by CCl4.
Histopathological studies were performed to provide direct evidence of the hepatotoxicity of CCl4. Marked disruption of the structure of hepatocytes was noted in liver tissue of Group II rats (exposed to CCl4 alone). Stripp et al.,  reported that lipids were accumulated abnormally in the liver of CCl4 induced hepatotoxic rats. The hepatoprotective effect of natansnin was supported by histological examination. Only minimal disruption of the structure of hepatocytes was noted in liver tissue of rats exposed to CCl4 and natansnin. Elevated levels of FITC fluorescent hepatocytes indicate the increased apoptosis of CCl4 treated liver hepatocytes over the control. The number of apoptotic cells were significantly reduced in both the concentrations of natansnin treated rats as evident by the decrease in TUNEL positive hepatocytes. Liver has selective vulnerability to different toxins; hence we wanted to determine the mechanism of cell death in liver after CCl4 treatment. Results of the current study revealed increased caspase- 3 activation and PARP cleavage in CCl4 treated rats in comparison with controls. This indicates that the cell death mechanism involves caspase- 3 activation. In previous studies, loss of mitochondrial cytochrome C was correlated with an increased production of reactive oxygen species by mitochondria, which may contribute to cellular damage . Prior treatment of natansnin profoundly decreased the increased expression of caspase- 3, PARP cleavage and translocation of cytochrome C from mitochondria to cytosol indicating that natansnin decreases the apoptosis in hepatocytes. Increased activation of Bax and Bid in CCl4 treated rats indicates apoptosis is more in these rats. Prior treatment of natansnin (both concentrations) reduced the incidence of apoptosis by decreasing the activation of Bax and Bid. Recent reports also demonstrated that induced nitric oxide overproduction occurs in the liver of rats with CCl4-induced acute liver injury suggested that iNOS may act as a mediator in the pathogenesis of hepatotoxicity in rats . Increased expression of COX-2, a known inflammatory mediator and cancer has been observed in the present study. Increased expression of COX-2 and iNOS indicate that there is a rise in inflammation in CCl4 treated rats. Prior treatment of natansnin significantly reduced this inflammatory effect. The present study revealed that prior administration of natansnin (both concentrations) significantly decreased the CCl4 induced oxidative stress and cellular degeneration.
The present study demonstrated that CCl4 induced a marked rise in oxidative stress and cellular degeneration in rat liver. Both the doses of natansnin treatment (10 and 20 mg/kg body wt) significantly ameliorated the effect of CCl4 induced oxidative stress damage and inhibited the expression of inflammatory and apoptotic proteins. This protective effect of natansnin can be correlated directly to its antioxidant property.
Chemicals and reagents
Thiobarbituric acid (TBA), epinephrine, GSH, GSSG, o-phthalaldehyde (OPT), N-ethyl maleimide (NEM), xanthine oxidase, PMSF, leupeptin, aprotinin, sodium orthovandate (Na3Vo4), Sodium fluoride (NaF), dithiotrietol (DTT), Na deoxycholate, β-glycerophosphate were obtained from Sigma chemical company, USA. Caspase-3, iNOS, COX-2, PARP, cytochrome C, Bax, Bid primary antibodies were obtained from Cell Signaling Technology, Beverly, MA, USA. Goat anti-rabbit and anti-mouse IgG ALP conjugate secondary antibodies, BCIP-NBT substrates for alkaline phosphatase, protein molecular weight marker were obtained from Genei Pvt Ltd, Bangalore, India. All other chemicals were obtained from standard commercial sources in India and were of analytical grade.
Isolation of compounds from Salvinia natans
Solvents such as hexane, ethyl acetate, chloroform and methanol were used for extraction of the compounds. The method adopted to isolate the compounds from Salvinia natans was column chromatography. The plant material was shade dried for ten days and powdered as mentioned earlier. Approximately 5 kg of the dried plant powder was immersed in hexane first to defatt and then it was extracted in methanol. The methanol extract was concentrated by distillation on a water bath. The concentrate was dried for a day and little amount of chloroform was added till it became wet. Then silica of 60:120 mesh sizes was added to the wet concentrate. The compounds were adsorbed to silica. The sticky concentrate became powdery and it was dried at room temperature for 1 day to remove any solvent present in it. It was then loaded into a glass column of 3 feet length and 5 cm width filled with silica (100:200). The compounds were isolated from low polar to high polar compounds. All the fractions were monitored by recording 1H-NMR spectrum and the fractions contain glycoside signals were pooled and were further purified on silica gel followed by reversed phase C18 HPLC column to afford a novel dibenzoyl glycoside natansnin.
DPPH radical method
A modification of the method of  was used. Ethanolic solutions of DPPH- (10-4 M) and natansnin or butylated hydroxy tolune (BHT) solutions were mixed in disposable plastic half-microcuvettes, so that the final mass ratios were natansnin: DPPH- = 5.5:1, and reference compound (BHT): DPPH- = 0.5:1. The samples were incubated for 15 min in the dark at 30°C and the decrease in absorbance at 517 nm was measured against ethanol using a spectrophotometer. All determinations were performed in triplicate. The radical scavenging activities of the tested samples, expressed as percentage inhibition of DPPH-, were calculated according to the formula percentage inhibition = [(AB _ AA)/AB]*100  where AB and AA are the absorbance values of the blank and of the test sample, respectively, after 15 min.
Treatment of experimental animals
Research on animals was carried out with approval from the Institutional Animal Ethics Committee (IEAC) guidelines. Male albino Wistar rats weighing 100 ± 20 g were taken from the animal house facility of University of Hyderabad and checked for proper growth for at least 8-10 days. They were fed with commercial pellet diet and tap water ad libido. The animals were divided into five groups of four rats in each group.
Group 1: Control rats, which received 0.5 ml of mineral oil orally for 8 days.
Group 2: Received CCl4 (4 g/kg body wt) in 0.5 ml of mineral oil intraperitoneally and sacrificed after 24 h.
Group 3: Received natansnin (20 mg/kg body wt) in 0.5 ml of mineral oil orally for a period of 8 days and sacrificed.
Group 4: Received natansnin (10 mg/kg body wt) in 0.5 ml of mineral oil orally for a period of 8 days and then CCl4 (4 g/kg body wt) was given and sacrificed after 24 h.
Group 5: Received natansnin (20 mg/kg body wt) in 0.5 ml of mineral oil orally for a period of 8 days and then CCl4 (4 g/kg body wt) was given and sacrificed after 24 h.
Assessment of oxidative stress
Isolation of mitochondria
A slightly modified method of Laurence and Davies  was used for the preparation of mitochondria. Liver was homogenized followed by differential centrifugation in ice cold medium containing 220 mM D-mannitol, 70 mM sucrose, 2 mM HEPES, 0.2 mM EDTA and 0.36 mg/ml of bovine serum albumin and adjusted to pH 7.4. The final pellet containing mitochondria was suspended in 3 ml of 0.25 M sucrose and the protein content was determined by Lowry method . Mitochondria were kept at -80°C until further use.
Determination of enzyme levels in serum
Alkaline phosphatase (ALP) activity (IU/L) in serum was measured using standard assay kits Radiant-Centronic GmbH (Germany) for ALP). Serum alanine aminotransferase (ALT) was estimated by International Federation of Clinical Chemistry  (ERBA test kits).
Lipid peroxidation measurement
In liver homogenate and mitochondria, lipid peroxide level was carried out by the method of Ohkawa et al . A 10% liver homogenate was prepared in 1.15% Kcl and mitochondria were isolated by differential centrifugation. Mitochondria were washed with 1.15% Kcl and suspended in the same medium. Reaction system contained 5 mg of mitochondrial protein, 0.2 ml of 8.1% SDS, 1.5 ml of 20% acetic acid (pH 3.5) and 1.5 ml of 0.67% (w/v) aqueous solution of thiobarbituric acid. The total volume was made up to 4 ml with water and the tubes were heated in a waterbath at 95°C for 60 min. After cooling, 1.0 ml of water and 5.0 ml of n-butanol were added and the tubes were vortexed and then centifuged at 2000 × g for 10 min at room temperature. The absorbance of the organic layer was measured at 535 nm. A blank was also run simultaneously and tetra methoxy propane (TMP) was used as an external standard. The extent of lipid peroxidation was expressed as nmol of (MDA) formed per 100 mg of protein.
Determination of oxidized and reduced glutathione
Liver (250 mg) was homogenized in 3.75 ml of the phosphate - EDTA buffer (pH-8.0), 1 ml of 25% H3PO4 and centrifuged at 4°C at 100,000 g for 30 min and the supernatant obtained was used for the assay of reduced (GSH) and oxidised glutathione (GSSG) as per Hissin and Hilf .
Reduced glutathione (GSH) assay
To 0.5 ml of the supernatant, 4.5 ml of phosphate - EDTA buffer pH-8.0 was added. The final assay mixture contained 100 μl of the diluted tissue supernatant, 1.8 ml of phosphate - EDTA buffer (pH-8.0) and 100 μl of o-phthalaldehyde (OPT) solution. After 15 min incubation fluorescence at 420 nm was determined with the activation at 350 nm.
Oxidised glutathione (GSSG) assay
T he supernatant (0.5 ml) was incubated at room temperature with 200 μl of 0.04 M N-ethyl maleimide for 30 min. To this, 4.3 ml of 0.1N NaOH was added. To 100 μl of this mixture 1.8 ml 0.1 N NaOH, 100 μl of OPT was added and fluorescence was determined at 420 nm with activation at 350 nm. Results were expressed as μmoles per gm tissue.
Assay of catalase
Catalase activity was determined by the method of Aebi . The assay mixture contained 150 μl of 30 mM H2O2 and 850 μl of enzyme source. The decrease in absorbance was measured immediately at 240 nm and activity was expressed as nmols of H2O2 consumed per min per mg protein.
Superoxide dismutase (SOD) determination
SOD activity was determined by the inhibition of oxidation of epinephrine to adrenochrome which was monitored at 480 nm using xanthine-xanthine oxidase system by the method of Dionisi et al . Reaction mixture contained 0.01 M sodium carbonate buffer, 1 mM xanthine and 0.011 μM xanthine oxidase, 0.1-0.5 mg of protein sample (mitochondrial fragments or sonicated mitochondria or cytosol). The reaction was initiated by the addition of 1 mM epinephrine and absorbance was measured at 480 nm. Results are expressed as units per mg protein. One unit is defined as amount of enzyme which inhibits oxidation of epinephrine by 50%.
Assessment of cellular degeneration
In situ cell death detection by TUNEL labeling
In situ detection of DNA fragmentation was done using the terminal deoxy nucleotidyl transferase-mediated dUTP-biotin nick end-labeling method (TUNEL) (BD Bio-sciences, San Jose, CA, USA) and the method was adopted as per the protocol given in the kit.
Rat liver tissues were homogenized in 5 volumes of radio immunoprecipitaiton assay (RIPA) buffer containing 50 mM Tris-HCl (pH 8.0), 150 mM NaCl, 1 mM EDTA, 0.4% deoxy cholate, 1% NP-40 containing protease inhibitors including 1 mM phenylmethylsulfonylfluoride (PMSF) and phosphatase inhibitors including 10 mM β-glycerophosphate, 10 mM NaF, 0.3 mM Na3Vo4 and 0.3 mM aprotinin. The lysate was sonicated for 2 min and centrifuged at 14,000 g for 15 min at 4°C. The supernatant was collected as whole tissue lysate and frozen at -80°C before use. Protein concentrations were determined by Lowry method. Cellular protein (75 μg) was mixed with SDS sample buffer, boiled for 5 min and subjected to electrophoresis on 10% SDS-polyacrylamide gels and transferred onto nitrocellulose membranes. After blocking the nitro cellulose paper in non-fat dry milk (5%) in Tris Buffered Saline, (TBS) 10 mM Tris (pH 7.5) and 150 mM NaCl for 1 h at room temperature, membranes were incubated for 12-24 h with Cox-2, iNos, Caspase-3, PARP, cytochrome C, Bax and Bid primary antibodies. Then membranes were incubated with secondary antibodies conjugated to alkaline phosphatase (ALP) (anti-rabbit and anti-mouse IgG conjugated to ALP obtained from Genei Pvt Ltd., Bangalore, India), for 1-2 h at room temperature. Before and after incubation with secondary antibodies, membranes were washed with TBS and TBST (TBS containing 0.1% Tween-20). Immunoreactivty was visualized by incubating the membranes with BCIP-NBT solution (Genei Pvt Limited, Bangalore, India). Membranes were analyzed quantitatively using image J software (NIH).
All values were expressed as means ± S.D. Statistical significance was performed by analysis of variance followed by Bonferror's test. P < 0.05 was considered as significant.
malonaldehyde bis dimethylacetal
bovine serum albumin
ethylene diamine tetraaceticacid
Authors acknowledge financial support of DBT, DST and ICMR, New Delhi.
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