This study was performed to assess age-related changes in DNA damage and antioxidative capacity in 4, 8, 12, 16, 20, and 24 months old Sprague-Dawley male rats. The following were measured the degree of oxidative DNA damage as indicated by levels of 8-hydroxy-2'-deoxyguanosine (80HdG) in the kidney ; the peroxidized lipid concentrations in the plasma and the liver, as indicated by the levels of thiobarbituric acid reactive substances (TBARS); and the levels of antioxidant enzyme activities in the erythrocytes and the liver. Both body weight (BW) and epididymal fat pad (EFP) weight per BW increased with age until 16 months, then decreased slightly from 20 to 24 months. However, the weights of the liver, kidney and spleen per BW decreased with age. Concentrations of 8-OHdG in the kidney increased with age, only slightly front 4 to 16 months, and then markedly from 16 to 24 months. TBARS concentrations in the plasma and liver were shown to increase with age, being lowest in the 4 month-old group and highest in the 24 month-old group. Superoxide dismutase (SOD) activity in the erythrocytes increased with age Catalase activity in the erythrocytes increased from 4 to 16 months, then decreased from 20 to 24 months. Glutathione peroxidase (GSH-Px) activity in the erythrocytes showed no age-related change. Liver SOD activity decreased with age, particularly from 16 to 20 months, but catalase and GSH-Px activities in the liver showed no significant changes. These results showed that during the normal aging of SD rats, DNA damage in the kidney and TBARS concentrations in the plasma and liver increased with age, particularly after 16 months, and the imbalance of antioxidative enzyme activities in the erythrocytes accelerated with age.
This study was performed to investigate the effect of whole mandarin, peel, and pulp intake of Citrus unshiu Marc on the antioxidative capacity of 15-month-old rats. Forty-eight male Sprague-Dawley rats weighing 621.9 $\pm$ 10.1 g were separated into four groups according to body weight. The rats were raised with diets containing 5% (w/w) dried mandarin powder for four weeks. Three powders were used, consisting of mandarin peel, pulp, and the entire fruit. Total flavonoids, antioxidant vitamins and dietary fiber was highest in the mandarin peel powder, followed by the whole mandarin powder and the mandarin pulp. The body weight gains of the whole mandarin and mandarin pulp groups were higher, while that of the mandarin peel group was lower than that of the control group. Food intake and ratios of liver, kidney and epididymal fat pad (EFP) weights to body weight were not significantly different among the groups, but ratios of EFP weights per body weight of the experimental groups tended to be lower than that of the control animals. Plasma and liver TBARS concentrations decreased in all the mandarin groups compared to the control group. Plasma and liver xanthine oxidase (XO) activity decreased in all of the mandarin diet groups. Erythrocyte and liver SOD activity in all of experimental groups was not significantly different from the control group. Plasma vitamin A concentration increased significantly in all of the mandarin diet groups. That of the mandarin peel group was 4 times higher than that of the control group. Plasma total carotenoids and vitamin C level also increased in the mandarin peel group. Plasma vitamin I level was not significantly different among the groups.
This study was performed to investigate the effect of Puerariae radix-ethanol extracts rich in isoflavone on the antio-xidative system of rats. For this purpose, first, Puerariae radix was extracted with ethanol, and its total isoflavone and puerarin contents were analysed. Second, female Sprague Dawley rats were fed for 6 weeks with four diets which were based on AIN96G diet and supplemented with Puerariae radix-ethanol extracts to contain isoflavone. The isoflavone contents of four experimental diets were 0 mg, 500 mg, 1,000 mg, 2,000 mg per kg diet, respectively (control, P0.05%,P0.1%, P0.2%). Liver and erythrocyte activities of antioxidative enzyme such as superoxide dismutase (SOD), catalase,glutathione peroxidase (GSHpx) were measured. Also, plasma and liver malondialdehyde (MDA) concentrations, liver glutathione (GSH) and oxidized glutathione (GSSG) concentrations were measured. The total isoflavone content of Puerariae radix-ethanol extract was 3067.6 mg per 100 g extract and the content of puerarin was 2557.4 mg per 100 g extract. The erythrocyte activities of GSH-Px and catalase were higher in group P0.1% and P0.2%. But SOD activity of erythocyte did not show any difference by the Puerariae radix-ethanol extract supplementation in diet. The activity of SOD in liver increased significantly by the supplementation of extract, showing highest level in P0.1% group. The liver GSH concentration increased significantly in group of P0.05%, P0.1%, and P0.2% compared with control group (p <0.05). The GSSG concentration in liver showed no difference by the supplementation of Puerariae radix extract from the control group, except P0.2% group. The plasma MDA concentration did not show any significant differences by the extract supplementation. But the liver MDA concentration decreased by the extract supplementation, showing the lowest level in P0.1 % diet group. These results suggest that the supplementation of Puerariae radix-ethanol extract can inhibit lipid peroxidation in liver and enhance the antioxidative defense competence of rats.
This study is to find out the antioxidative effect and serum lipid composition of wild grape seed powder in vivo. 20 white Sprague Dawley rats of six weeks old were divided into 2 groups and AIN-93 basic diet, high fat and cholesterol were provided. And they were examined to know how wild grape seed powder worked for antioxidative effect and serum lipid composition. For the comparing group, wild grape seed powder consisting 5% of the diet weight was provided and the quantity of protein, fat, carbohydrate, and cellulose was controlled following the analysis of the ingredients. The rats were fed for four weeks with experimental diet. Serum lipid and the antioxidant enzyme activity in blood and liver microsome were measured after 4 weeks of experiment. The results are as follows; There was no difference between the experimental groups in the initial body weight, final body weight, weight gain and FER. Food intake was higher in the group wild grape seed powder was provided than in the control group(p<0.05). Serum total cholesterol in the control group was significantly higher than that in the group wild grape seed powder was provided.(p<0.05). There was no difference serum HDL cholesterol and LDL cholesterol between the groups. Serum triglyceride showed no significant difference between the groups. In blood, glutanthione peroxidase activity was higher in the group supplemented with wild grape seed powder than in the control group. The glutathione reductase activity of blood showed no difference between the groups. In liver, the glutanthione peroxidase activity was higher in the group supplemented with wild grape seed powder than in the control group(p<0.05). Glutathione reductase activity in liver showed no difference in accordance with the supplementation of wild grape seed powder.
In order to examine the cross-tolerance of two chilling-tolerant cultivars (Donganbyeo and Heukhyangbyeo) and two chilling-susceptible cultivars (Hyangmibyeo and Taekbaekbyeo) to salt, paraquat, and drought, changes of physiological response and antioxidant enzymes were investigated. The seedlings were grown in a growth chamber until the 4-leaf stage. The seedlings were exposed to chilling at $5^{\circ}C$ for 3 days. For drought treatment, the seedlings were subjected to drought by withholding water from plants for 5 days. For paraquat study, plants were sprayed with $300{\mu}M$ paraquat. For the salt stress, the seedlings were transferred to the Hoagland's nutrient solution containing 0.6% (w/v) NaCl for 4 days. Chilling-tolerant cultivars showed cross-tolerant to other stresses, salt, paraquat, and drought in physiological parameters, such as leaf injury, chlorophyll a fluorescence, and lipid peroxidation. The baseline levels of antioxidative enzyme activities, catalase (CAT) and peroxidase (POX) activities in chilling-tolerant cultivars were higher than in the chilling-susceptible cultivars. However, there were no differences in ascorbate peroxidase (APX) and glutathione reductase (GR) activities between chilling-tolerant and -susceptible cultivars in untreated control. CAT activity in chilling-tolerant cultivars was higher than that in chilling-susceptible cultivars during chilling, salt, and drought treatments, but not during paraquat treatment. However, other antioxidative enzymes, APX, POX, and GR activities showed no significant differences between chilling-tolerant and -susceptible cultivars during chilling, salt, paraquat, and drought treatments. Thus, it was assumed that CAT contribute to cross-tolerance mechanism of chilling, salt, and drought in rice plants.
Journal of the Korean Society of Food Science and Nutrition
/
v.28
no.3
/
pp.646-653
/
1999
This study was done to investigate the effect of ${\gamma}$ irradiated beef feeding on antioxidant vitamin levels and defense enzyme activities in diethylnitrosamine(DEN) initiated rats. Weaning Sprague Dawley male rats were fed the diet containing ${\gamma}$ irradiated ground beef at the dose 0, 3, 5 kGy as a 20% of protein source for 8 weeks. One week after feeding, rats were intraperitoneally injected twice with a dose of DEN(50mg/kg BW). As a promoter, 0.05% phenobarbital was fed in drinking water from one week after DEN treatment until the end of experiment. At the end of 8th week, serum level of vitamin C, serum and hepatic levels of retinol and tocopherol were determined. In addition, activities of cytosolic glutathione peroxidase, glutathione reductase, glutathione S transferase, catalase and hepatic superoxide dismutase(SOD) were measured. By ${\gamma}$ irradiation, there was no significant effect on serum and hepatic levels of vitamin C and tocopherol except a significant decreasing effect on hepatic retinol level. There was also no significant effect on the activities of enzymes involved in antioxidative defense system, However, DEN treatment led to a significant increase in activities of glutathione reductase and glutathione S transferase while the activity of glutathione peroxidase was decreased. The activities of hepatic SOD and catalase were not changed by DEN treatment. Overall results indicate that the consumption of low dose of ${\gamma}$ irradiated beef does not affect antioxidative defense system.
This study was performed to investigate the effets of hesperidin extracted from tangerine peel on Cadmium (Cd) and lipid metabolism lipid peroxide formation, and antioxidative enzyme activities in rats. Forty-eight male Sprague-Dawley rats weighing 158.3$\pm$3.5g were blocked into eight groups according to body weight. Rats were raised for three weeks with diets containing 0 or 0.04%(w/w) cadmium chloride and 1%(w/w) extracted hesperidin from tangerine peel, commercial hesperidin or naringin. Food intake, weight gain and food efficiency ratio were significantly lower in the Cd-administered groups. The Cd concentrations in blood and liver and the Cd excretions in urine and feces were significantly higher in the Cd-administered groups. Among the Cd groups, blood Cd concentrations were decreased, fecal Cd excretions were increased, and Cd retenition ratios were decreased by feeding flavonoid diets. Plasma total lipid concentrations were significantly lower in the extracted hesperidin group, plasma triglyceride concentrations were significantly lower in the extracted hesperidin and naringin groups. Plasma HDL-cholesterol concentrations and HDL : total cholesterol ratios were increased by feeding flavonoids. Among the Cd groups, liver total lipid concentratons were decreased by feeding flavonoids. Fecal total lipid, fecal cholesterol, and fecal triglyceride excretions were significantly higher in the naringin group, and they were increased by feeding flavonoids among Cd groups. Thiobarbituric acid reactive substance concentrations in plasma and liver were higher in Cd groups, and were significantly decreased by feeding flavonoids. The activities of erythrocyte catalase, superoxide dismutase and glutathione peroxidase showed a tendency to increase by feeding. The activities of liver catalase, superoxide dismutase and glutathione peroxidase were not significantly affected by administering Cd or flavonoids. In conclusion, all flavonoids that were used in this experiment inhibited lipid peroxide formation in plasma and liver, but this effect was not caused by the increased in the activities of antioxidative enzymes.
Journal of the Korean Society of Food Science and Nutrition
/
v.33
no.6
/
pp.973-980
/
2004
To evaluate the antioxidative effect of rice coated with maengjong-juk extract in vivo system, rice coated with maengjong-juk extract diets were fed to NZW rabbit for 16 weeks and lipid peroxidation, protein oxidation, activities of antioxidative enzymes and total glutathione content in tissues were measured. TBARS contents in liver and spleen were significantly decreased in maengjong-juk extract diet group compared to control group, while those in kidney and heart tissue were not significantly different. Maengjong-juk extract diet suppressed the protein oxidation significantly in liver, spleen, kidney and heart tissues. Hepatic total SOD, Cu$.$Zn-SOD and Mn-SOD activities of maengjong-juk extract diets were significantly higher than those of control diet. GSH-Px and catalase activities of maengjong-juk extract diet were higher than those of control, while GR activities show no significant difference between the two groups. Total hepatic glutathione content was significantly increased by maengjong-juk extract diet. According to this study, many antioxidative materials and phytochemicals in maengjong-juk extracts seems to protect tissues from oxidative stress by stimulating antioxidative systems in atherosclerotic rabbit fed high cholesterol diet.
Silymarin, which is derived from dried Silybum marianum (milk thistle) seeds and fruits, possesses various beneficial properties, such as hepatoprotective, antioxidative, anti-inflammatory, and anticancer activity. This research aimed to explore the antioxidative activity of silymarin against oxidative stress and understand its molecular mechanism in RAW 264.7 cells. The study employed cell viability and reactive oxygen species (ROS) formation assays and western blot analysis. The results demonstrated that silymarin effectively reduced intracellular ROS levels induced by lipopolysaccharide (LPS) in a dose-dependent manner without causing any cytotoxic effects. Moreover, silymarin treatment significantly upregulated the expression of heme oxygenase (HO)-1, a phase II enzyme known for its potent antioxidative activity. Additionally, silymarin treatment significantly induced the expression of nuclear factor-erythroid 2 p45-related factor (Nrf) 2, a transcription factor responsible for regulating antioxidative enzymes, which was consistent with the upregulated HO-1 expression. To investigate the involvement of key signaling pathways in maintaining cellular redox homeostasis against oxidative stress, the phosphorylation status of mitogen-activated protein kinase (MAPK) and phosphoinositide 3-kinase (PI3K) was estimated by western blot analysis. The results showed that silymarin potently induced HO-1 expression, which was mediated by the phosphorylation of p38 MAPK. To further validate the antioxidative potential of silymarin-induced HO-1 expression, tert-butyl hydroperoxide (t-BHP)-induced oxidative damage was employed and attenuated by silymarin treatment, as identified by a selective inhibitor for each signaling molecule. In conclusion, silymarin robustly enhanced antioxidative activity by inducing HO-1 via the Nrf2/p38 MAPK signaling pathway in RAW 264.7 cells.
This study was undertaken to investigate the antioxidative substance and activity of ethyl acetate extracted from Rumex crispus. Sample extracted follow in proper course of a solvent. Material refinement was carried out using silicagel column and Sephadex LH-20 column chromatography. Material sorting was carried by Gas Chromatography(GC/MS). 1,1-Diphenyl-2-Picrylhydrazyl(DPPH) free radical scavenging and enzyme activity were measured for antioxidative activity. as result of testing by DPPH free radical scavenging activity, Antioxidative activity was shown as the highest in the root, then leaf and stem in order. Ethyl acetate extraction of root part were 50% inhibitory concentration (IC50) Rumex activty(6.1 ug/mL). Rumex nipponicus(9.8 ug/ml) and Rumex acetoceae(31.5 ug/mL) in leaf part. The highest antioxidative activity of sample refined through silicagel column chromatography of Rumex crispus was appealed Fraction 5(IC50;3.57 ug/mL) in root and Fraction 6(IC50;85.9 ug/mL) in leaf. Fraction 5 in roof & Fraction 6 in leaf were refined using Sephadex LH-20 column chromatography. The highest antioxidative activity were appeared Fraction 4 (IC50;3.57 ug/mL) and Fraction 4 (IC50;18.41 ug/mL)in leaf. As for main phenol compounds 2,6-Dichloro-4-nitropnenol and 2-Isopropyl-5-methyl Phenol were identified in root and leaf, While 4-Vinyl-2- methoxy-phenol and 2,3-Dihydro- benzofuran were identifica ted only in leaf. Enzyme activity was shown low both in peroxidase(PDD) Non-activate(IU/mg protein)and in Superoxide dismutase(SOD) non-activate(IU/mg protein). 2,6-Dichloro-4-nitrophenol, 2-Isopropyl-5-methyl phenol, 4-Vinyl-2-methoxy-phenol were obtained in this experiment and these compounds are phenolic compounds which have OH group in the structure. With the result of this study these phenolic compounds which are extracted from Rumex crispus have high antioxidative effect. This antioxidative effect of Rumex crispus can be applied for chromo-preventive and antioxidative supplements which can be used for anti-allegy, aging, anti-tumor, aging and other oxidative disease for health promotion.
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