In previous works, we found that solvent extract of Opuntia humifusa Raf., a member of the lactaceae family, displayed potent anti-oxidative and anti-inflammatory activities. Thus, all solvent fractions, except for the water layer, showed potent scavenging effects. According to activity-guided fractionation, one of active radical scavenging principles in the ethyl acetate fraction was found to be taxifolin. In this study, we investigated whether taxifolin showed anti-oxidative activity. In addition, taxifolin modulated nitric oxide (NO) release and the expression of pro-inflammatory cytokine mRNA such as interleukin-$1{\beta}$ (IL-$1{\beta}$), IL-6, granulocyte-macrophage colony-stimulating factor (GM-CSF), and TNF-${\alpha}$. Taxifolin showed potent anti-oxidant activity with the $IC_{50}\;of\;8.5{\pm}1.4\;and\;9.3{\pm}1.0{\mu}M$ using xanthine/xanthine oxidase (XO) assay and 2,2-Diphenyl-lpicrylhydrazyl radical (DPPH) assay, respectively. We next determined the role of taxifolin on the immunomodulating activity using murine macrophage cell line RAW264.7 cells. Taxifolin dose-dependently inhibited NO production in lipopolysaccharide (LPS)-activated RAW264.7. It also significantly blocked the expression of inducible NO synthase (iNOS) mRNA in the LPS-stimulated RAW264.7 cells. In addition, taxifolin potently suppressed the expression of IL-$1{\beta}$, IL-6 and GM-CSF mRNA in LPS-activated RAW264.7 cells, but not that of TNF-${\alpha}$ Moreover, taxifolin significantly inhibited the transcriptional activity of nuclear factor-${\kappa}B$ (NF-${\kappa}B$) and activator protein -1 (AP-1). These results suggest that taxifolin may downregulate inflammatory iNOS, IL-$1{\beta}$, IL-6 and GM-CSF gene expressions through inhibition of NF-K and AP-1 activation in LPS-stimulated RAW264.7 cells.
Journal of the Korean Society of Food Science and Nutrition
/
v.36
no.4
/
pp.411-418
/
2007
Oxidative stress can play a key role in cadmium (Cd)-induced dysfunction. The present study examined the effect of pine needle water extract (PN) on Cd-induced oxidative stress in rats. Sprague-Dawley male rats were divided into three groups: normal group, Cd control group (Cd) and PN-administered Cd group (Cd-PN). $CdCl_2$ in 0.9% NaCl was administered orally with a dose of 5mg/kg of body weight/week, while the PN was administered orally with a dose of 1.26g/kg of body weight/day. Body weight gain was not different between groups, whereas food intakes were significantly lower in the Cd-PN group than in normal or Cd group. Relative liver weight was significantly increased by cadmium administration compared to the normal group. Hepatic cytochrome P450 was significantly lower in Cd and Cd-PN groups than in normal group, while xanthine oxidase and alcohol dehydrogenase activities were significantly higher in the Cd-PN group than in normal or Cd group. Increased hepatic superoxide dismutase, monoamine oxidase, catalase, and glutathione peroxidase activities by cadmium administration were significantly decreased by PN supplement. PN did not affect the hepatic glutathione content in cadmium-administered rats; however, PN significantly lowered the hepatic lipid peroxide level and plasma alanine transferase activity compared to the Cd control group. These results suggest that the PN may alleviate Cd-induced oxidative stress without hepatotoxicity.
This study was designed to test the effect of Korean traditional tea materials on oxygen-free radical metabolism in lead (Pb) -administered rats. Male rats were divided into normal, Pb-control (Pb-Con) and Pb-water extract of green tea (Camellia sinensis; GT) , persimmon leaf (Diospyros kaki; PL) , safflower seed (Carhamus tinctorius: SS) , Du-Zhong (Eucommia ulmoides; EU) groups, respectively. Pb intoxication was induced by administration of lead acetate (25 mg/kg. B.W., oral) weekly. The extract was administered based on 1.26 g of raw material/kg B.W./day for 4 weeks. When the GT, PL, SS and EU were supplemented to the Pb-administered rats, hepatic lipid peroxide levels were significantly lower compared to the Pb-Con group. Hepatic cytochrom P-450 content and aminopyrine N-demethylase activity was lower in the Pb-Con group than in the normal group, whereas xanthine oxidase activity was significantly elevated in Pb-administered rats. The water extract of GT, PL, SS and EU supplementation attenuated changes in enzyme activities generating reactive oxygen species in the liver. Hepatic superoxide dismutase, catalase and glucose 6-phosphate dehydrogenase activities were significantly higher in the Pb-Con group than in the normal group, while monoamine oxidase activity also tended to increase in the Pb-administered rats. However, glutathione peroxidase and glutathione S-transferase activities, and glutathione content significantly decreased through Pb intoxication. The supplementation of GT, PL, SS and EU induced alleviation changes of hepatic antioxidant enzyme activity.
Journal of the Korean Society of Food Science and Nutrition
/
v.29
no.4
/
pp.669-675
/
2000
This study investigated the effect of Puerariae Flos (PF; flower of Puerariae plant) and Puerariae Radix (PR; root of Puerariae plant) water extracts on the activities on the activities of ethanol-metabolizing enzymes and free radical generating/scavenging enzymes of brain in ethanol-treated rats. Five groups of male Sprague-Dawley rats were orally administered ethanol (25%, v/v) 5 g/kg body weight/day, and sacrificed 5 weeks post treatment. PF and PR water extracts were supplemented in a diet based on 1.2g (I) or 2.4 g (II) raw PF or PR/kg body weight/day. Alcohol dehydrogenase activity of brain was significantly lowered in PF of PR groups, whereas aldehyde dehydrogenase activity was significantly higher in PR groups than those of control and PF groups. Cytochrome P-450 content, aminopyrine D-methylase and aniline hydroxylase activities were decreased in both PF and PR groups compared to control group. Aldehyde oxidase and xanthine oxidase activities tended to decrease by Puerariae plant extract supplemented goups and degree of decrease predominated in PRI. Superoxide dismutase and glutathione S-transferase activities were increased in PF or PR groups, whereas glutathione peroxidase and catalase activities were significantly decrased by Puerariae plant extracts supplement. These results indicated that supplementation of PF or PR lowers free radical generating enzymes activities. It was suggested that the activities of ethanol metabolizing emzymes and antioxidant enzymes in brain can be enhanced by PF or PR supplement in ethanol-treated rats.
This study investigated the hepatoprotective effects of an ethanol extract of lotus root (LRE) on alcohol-induced liver damage in rat. Sprague-Dawley rae weighing $100{\sim}150g$, were divided into 6 groups: basal diet group (BD), alcohol (35% 10 mL/kg/day) teated stoup (ET), LRE 200 mg/kg/day teated group (BD-LREL). LRE 400 mg/kg/day treated group (BD-LREH), LRE 200 mg/kg/day and alcohol treated group (ET-LREL), and LRE 400 3mg/kg/day and alcohol teated group (ET-LREH). After the administration, rats were sacrificed to get serum and liver to analyze antioxidant enzyme activity, glutathione and lipid peroxide contents. The body weight gain and feed efficiency ratio were decreased by alcohol administration, however, were gradually increased to a little lower level than the basal diet group by the combined administration of alcohol and LRE. The serum alanine aminotransferase (ALT), asparate aminotransferase (AST) and alkaline phosphatase (ALP) activities that were elevated by alcohol were significantly decreased by LRE administration. It was also observed that thiobarbituric acid reactive substances (TBARS) content, xanthine oxidase (XO), superoxide dismutase (SOD), catalase and glutathione peroxidase (GSH-Px) activities in liver that were increased by alcohol, were markedly decreased in the combined alcohol and LRE administered groups as compared with the alcohol administrated group. These effect of LRE within the alcohol groups were in a dose-dependent manner. The glutathione (GSH) content in liver was decreased by alcohol administration, however, increased after administering LRE. Teken together, these result suggest that ethanol extract of lotus root may have a possible protective effect on liver function in hepatotoxicity-induced rat by alcohol administration.
Kang, Jung Ae;Nam, You Ree;Rho, Jong Kook;Jang, Beom-Su;Chung, Young-Jin;Park, Sang Hyun
Journal of the Korean Society of Food Science and Nutrition
/
v.44
no.5
/
pp.657-663
/
2015
Ionizing radiation induces cell damage through formation of reactive oxygen species. The present study was designed to evaluate the protective effects of post-treatment with hesperetin against ${\gamma}$-irradiation-induced cellular damage and oxidative stress in BALB/c mice. Healthy female BALB/c mice were exposed to ${\gamma}$-irradiation and administered hesperetin (25 mg/kg and 50 mg/kg, b.w., orally) for 7 days after 6 Gy of ${\gamma}$-irradiation. Exposure to ${\gamma}$-irradiation resulted in hematopoietic system damage manifested as decreases in spleen indexes and WBC count. In addition, hepatocellular damage characterized by increased levels of aspartate aminoransferase (AST) and alanine aminotransferase (ALT) in plasma. However, post-irradiation treatment with hesperetin provided significant protection against hematopoietic system damage and decreased AST and ALT levels in plasma. The results indicate that ${\gamma}$-irradiation induced increases in lipid peroxidation and xanthine oxidase (XO) as well as decreases in antioxidant enzymes (superoxide dismutase, catalase, and glutathione peroxidase) and glutathione (GSH) in the liver. These effects were also attenuated by post-treatment with hesperetin, which decreased lipid peroxidation and XO as well as increased antioxidant enzymes and GSH. These results show that post-treatment with hesperetin offers protection against ${\gamma}$-irradiation-induced tissue damage and oxidative stress and can be developed as an effective radioprotector during radiotherapy.
Journal of the Korean Society of Food Science and Nutrition
/
v.30
no.6
/
pp.1177-1183
/
2001
This study was done to investigate the effects of ethanol extract of Cassia semen (Cassia tora L.) on the activities of hepatic oxygen free radicals metabolizing enzymes and blood lipid profile in rats of hepatotoxicity induced by ethanol. Sprague-Dawley male rats weighing 100~160 g were divides into 5 groups; control grouts (CON), Cassia semen ethanol extracts (200 mg/kg) treated group (CEL), ethanol (10 mL/kg, 35%) treated group (ETH), Cassia semen ethanol extracts (200 mg/kg) and ethanol treated group (CE1 ) and Cassia semen ethanol extracts (400 mg/kg ) and ethanol treated group (CE2), respectively. Compared with ETH, the growth rate of CE1 and CE2 were to be increased tendency, and in blood levels of total cholesterol, LDL-cholesterol and the activities of alanine aminotranferase and asparate aminotranferase elevated by ethanol were significantly decreased (p<0.05). It was observed that the activities of superoxide dismutase, catalase, xanthine oxidase and glutathione peroxidase of rat liver increased by ethanol, were more decreased by the treatment of Cassia semen ethanol extract than the only ethanol-treated group. The content of glutathione depleted by ethanol treatment was increased in CE1 and CE2. TBA-reactants of liver increased by ethanol were decreased in CE1 and CE2, compared with ethanol-treated group. These results suggested that ethanol extract of Cassia semen may influence upon the ability of oxygen free radical detoxication and lowering of blood lipid level on ethanol-induced hepatotoxicity in rat.
Journal of the Korean Society of Food Science and Nutrition
/
v.35
no.10
/
pp.1336-1342
/
2006
This study was performed to investigate the effect of ethanol extract of Chaenomeles sinensis Koehne (CS) on alcohol-induced liver damage in rats. Male Sprague-Dawley rats weighing $135{\pm}10g$ were divided into 6 groups for 4 weeks; normal group (ND), alcohol (35%, 10 mL/kg/day) treated group (ET), CS ethanol extract 200 mg/kg/day treated group (ND-CSL), CS ethanol extract 400 mg/kg/day treated group (ND-CSH), CS ethanol extract 200 mg/kg/day and alcohol treated group (ET-CSL), and CS ethanol extract 400 mg/kg/day and alcohol treated group (ET-CSH). The body weight gain and food efficiency ratio were no differences between ND and ET. There were increases in the activities of serum alanine aminotransferase (ALT), asparate aminotransferase (AST), and alkaline phosphatase (ALP) in ET. On the other hand, the administration of CS decreased ALT, AST and ALP activities in serum. It was also observed that the hepatic activities of superoxide dismutase (SOD), catalase, glutathione peroxidase (GSH-Px) and xanthine oxidase (XO) increased by alcohol treatment were also markedly decreased in the CS administered groups as compared with ET. The activities of hepatic SOD, catalase, GSH-Px and XO were riot significantly different among the normal diet groups. Contents of thiobarbituric acid reactive substances (TBARS) were increased by the administration of alcohol, on the other hand, the administration of CS reduced TBARS value in the liver. In addition, the content of glutathione (GSH) in the liver was decreased by alcohol administration, however, GSH increased after administering CS. In conclusion, the administration of alcohol develops the hyperoxidation of liver lipids through tile increase in enzymes activity related to the lipid peroxiation, however, it was decreased after administring CS. Thus, CS may have a possible protective effect on ethanol-induced hepatotoxicity in rat liver.
The determination of ADA(adenosine deaminase) activity in pleural fluid is useful in differental diagnosis of pleural effusion. The conventional method of determining ADA activity used by Giusti was influenced by contamination of ammonia. Additionally, because Giusti's method was mannual method a determining the ADA activities in sample, was not easily automated. In 1993, Oosthuizen HM with collegues developed simple kinetic method for determining ADA activity. It was reliable and suiable method for automation. In this study, we have measured ADA activity in 162 patients with various pleural effusion by Hitachi 747 autoanalyser using the Oosthuizen kinetic method for the purpuse of determination of new diagnostic cut-off value for the tuberculous effusion and evaluation of the correlation between the conventional method and new automated method. This new method of an enzymatic reaction involves 2, 6-dichlorophenolindophenol dye(DICP), adenosine, xanthine oxidase(XO), and nucleoside phosphorylase(NP). The results were as follows: 1) The mean pleural ADA activity of the tuberculous effusion was $52.53{\pm}16.43\;U/L$ and significantly higher than that of other groups(p<0.001). If the diagnostic cut-off value of pleural ADA activity for tuberculous effusion is above 30 U/L, the sensitivity is 96% and the specificity is 90%. 2) The mean pleural to serum ADA activity ratio of the tuberculous effusion was $2.29{\pm}0.96$ and it was also significantly higher than that of other pleural groups(p<0.001). If the diagnostic cut-off value of pleural to serum ADA activity ratio is 1.5, the sensitivity is 80% and the specificity is 88% in the diagnosis of tuberculous pleural effusion. 3) The new kinetic method is correlates well to Giuisti's conventional method(r=0.971). In conclusion, the new kinetic method described is easily automated and seems to be suitable for the routine determination of ADA activity.
Journal of the Korean Society of Food Science and Nutrition
/
v.33
no.4
/
pp.653-658
/
2004
Oxidative stress is currently suggested as a mechanism underyling diabetes. Accordingly, the present study was designed to evaluate the effect of Aralia elate water extracts (AEW) on activities of hepatic oxygen free radical generating and scavenging enzymes in streptozotocin (STZ)-induced diabetic rats. Male Wistar rats divided into nondiabetic group, diabetic group, and diabetic-AEW supplemented group. The extract was supplemented in 1.14% of raw Aralia elata/kg diet for 7 weeks. Diabetes was induced by injecting STZ (55 mg/kg BW, ip) once 2 weeks before sacrifying. The hepatic cytochrome P-450 content, xanthine oxidase and aminopyrine N-demethylase activities were significantly lowered in the diabetic group compared to the nondiabetic group. Whereas, the activities of aniline hydroxylase and oxygen free radical scavenging enzymes, superoxide dismutase, catalase, glutathione peroxidase, glutathione reductase, glucose-6-phosphate dehydrogenase and glutathione S-transferase, were significantly higher in the diabetic group than in the nondiabetic group. However, the supplementation of AEW normalized these enzyme activities in STZ-induced diabetic rats. When the AEW was supplemented with the diabetic rats, hepatic glutathione content was markedly elevated as well as lipid peroxide level was significantly lowered compared to those of the diabetic group. Thus, these results suggested that AEW supplement enhanced the activities of oxygen species metabolizing enzymes in STZ-induced diabetic rats.
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