Background: More than 70% of morbidity and mortality of diabetes mellitus is due to macrovascular complications. These complications may be associated with defect of endothelium-dependent vascular relaxation. There have been suggestions that this defect might be due to direct toxicities of oxygen-free radical. So in this study ascorbic acid was used as a dietary supplement in streptozotocin induced diabetic rats to correct this defect. Material and Method: Sixty male Sprague-Dawley rats were used in this study. They were divided into control and experimental groups. Streptozotocin was injected to the 33 rats of experimental group and then divided into two the other receiving subgroups; one receiving ascorbic acid supplement(1 g/l in drinking water); and nosupplements. At 6, 9 and 12 weeks, abdominal aortic rings were obtained to make tissue preparations for evaluation of vascular smooth muscle contractility. Result: While control group showed good response to acetylcholine induced relaxation, diabetic group showed decreased relaxation regardless of ascorbic acid supplement at the experiments 6 weeks after streptozotocin treatment. This abnormal endothelium-dependent vascular relaxation was markedly reversed at 9 and 12 weeks into the diabetic group with ascorbic acid supplement. There were no differences in sodium nitroprusside induced relaxation responses between control and experimental groups; also, norepinephrine induced contractile responses did not show any remarkable effects. Conclusion: These results strongly suggest that the endothelial cells have defects in diabetic rats. Dietary supplement of ascorbic acid can reverse the defects of diabetic endothelial cells through its antioxidant effects and it may further protect against vascular disease in diabetic patients.
Background: Paraplegia is a devastating complication following operations on the thoracoabdominal aorta. We investigated whether histidine-tryptophan-ketoglutarate (HTK) solution could reduce the extent of ischemia/reperfusion (IR) spinal cord injuries in a rat model using a direct delivery method. Methods: Twenty-four Sprague-Dawley male rats were randomly divided into four groups. The sham group (n=6) underwent a sham operation, the IR group (n=6) underwent only an aortic occlusion, the saline infusion group (saline group, n=6) underwent an aortic occlusion and direct infusion of cold saline into the occluded aortic segment, and the HTK infusion group (HTK group, n=6) underwent an aortic occlusion and direct infusion of cold HTK solution into the occluded aortic segment. An IR spinal cord injury was induced by transabdominal clamping of the aorta distally to the left renal artery and proximally to the aortic bifurcation for 60 minutes. A neurological evaluation of locomotor function was performed using the modified Tarlov score after 48 hours of reperfusion. The spinal cord was harvested for histopathological and immunohistochemical examinations. Results: The spinal cord IR model using direct drug delivery in rats was highly reproducible. The Tarlov score was 4.0 in the sham group, $1.17{\pm}0.75$ in the IR group, $1.33{\pm}1.03$ in the saline group, and $2.67{\pm}0.81$ in the HTK group (p=0.04). The histopathological analysis of the HTK group showed reduced neuronal cell death. Conclusion: Direct infusion of cold HTK solution into the occluded aortic segment may reduce the extent of spinal cord injuries in an IR model in rats.
Journal of the Korean Society of Food Science and Nutrition
/
v.43
no.6
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pp.799-806
/
2014
The present study was conducted to evaluate the effects of extract from Eriobotrya japonica leaves (EJE) on cognitive impairment induced by scopolamine, a muscarinic antagonist, in rats. Scopolamine injection (1 mg/kg, i.p.) impaired performance in rats in the passive avoidance test as well as in water maze test and severely reduced cholinergic system reactivity, as indicated by reduced acetylcholine levels and increased acetylcholinesterase activity. Daily administration of EJE significantly increased step-through latency in the passive avoidance test, reduced escape latency, and increased time spent in the platform quadrant in the Morris water maze test. EJE protected against scopolamine-induced cholinergic system deficit, including reduced acetylcholine levels and increased acetylcholinesterase activity in whole brain homogenates. These results suggest that EJE provides a significant anti-amnesic effect against scopolamine-induced cholinergic system deficits and cognitive impairment.
High temperature- and pressure-treated garlic (HTPG) has been shown to have enhanced antioxidative activity and polyphenol contents. Previously, we reported that HTPG inhibited 1,2-dimethylhydrazine-induced mucin depleted foci (premalignant lesions) and $O^6$-methylguanine DNA adduct formation in the rat colorectum. In the present study, we investigated the modifying effects of HTPG on N-ethyl-N'-nitro-N-nitrosoguanidine (ENNG)-induced pyloric stomach and small intestinal carcinogenesis in mice. Male C57BL/6 mice were given ENNG (100 mg/l) in drinking water for the first 4 weeks, then a basal diet or diet containing 2% or 5% HTPG for 30 weeks. The incidence and multiplicity of pyloric stomach and small intestinal (duodenal and jejunal) tumors in the 2% HTPG group (but not in the 5% HTPG group) were significantly lower than those in the control group. Cell proliferation of normal-appearing duodenal mucosa was assessed by MIB-5 immunohistochemistry and shown to be significantly lower with 2% HTPG (but again not 5% HTPG) than in controls. These results in dicate that HTPG, at 2% in the diet, inhibited ENNG-induced pyloric stomach and small intestinal (especially duodenal) tumorigenesis in mice, associated with suppression of cell proliferation.
Objectives: The effects of Gamiondam-tang (GMODT) co-administration within 5min on the pharmacokinetics (PK) of tamoxifen were observed as a process of the comprehensive and integrative medicine, combination therapy of tamoxifen with GMODT to achieve synergic pharmacodynamics and reduce toxicity on the breast cancer. Methods: After 50mg/kg of tamoxifen treatment, GMODT 100mg/kg was administered within 5min. The plasma were collected at 30 min before administration, 30 min, 1, 2, 3, 4, 6, 8 and 24 hrs after end of GMODT treatment, and plasma concentrations of tamoxifen were analyzed using LC-MS/MS methods. PK parameters of tamoxifen (Tmax, Cmax, AUC, $t_{1/2}$ and $MRT_{inf}$) were analysis as compared with tamoxifen single administered rats using noncompartmental pharmacokinetics data analyzer programs. Results: Co-administration with GMODT induced increased trends of plasma tamoxifen concentrations to 1hr after end of administration, and then showed decreased trends of plasma tamoxifen concentrations, and especially significant (p<0.05) increases of plasma tamoxifen concentrations were demonstrated at 0.5hr after end of co-administration with GMODT and also related significant (p<0.05) decreases of $AUC_{0-inf}$ and $MRT_{inf}$ as compared with tamoxifen single formula treated rats, at dosage levels of tamoxifen 10 mg/kg and GMODT 100 mg/kg within 5 min, in this experiment. Conclusion: Based on the results of the present study, it is considered that single co-administration GMODT within 5min significantly inhibited the oral bioavailability of tamoxifen through variable influences on the absorption and excretion of tamoxifen, can be influenced on the toxicity or pharmacodynamic of tamoxifen.
Yang, Dong Hyun;OH, Ji Hye;Park, Un kyu;Cho, Chung Sik;Hwang, Seock Yeon
Journal of the Korea Academia-Industrial cooperation Society
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v.21
no.10
/
pp.231-239
/
2020
The purpose of this study was to evaluate the effects of gobonyangjeonbang (GYB) on the endocrine function and the antioxidant efficacy of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD)-induced oxidative stress in rats. In 2017, to evaluate the efficacy of GYB on oxidative stress, 35 male SD rats were divided into five groups and tested. The normal control group was administered saline as a vehicle, while the TCDD-alone group was administered TCDD (2 ㎍/kg per week) intraperitoneally and with physiological saline, and the test group was administered GYB orally by dividing it into three concentrations (75, 150, and 300 mg/kg) for six weeks. Bodyweight decreased significantly after six weeks of TCDD exposure, when compared to rats in the NC group (p<0.001). However, weight loss from TCDD was significantly protected by administration of GYB at 300 mg/kg (p<0.01). The rat liver induced by TCDD showed cytoplasmic vacuole degeneration, and the hepatic sinusoid and weight increased. As a result of measuring MDA and SOD, both items tended to decrease under TCDD administration. On the other hand, there was no change due to GYB administration, and significance was observed in the GYB 300 mg/kg group compared to the NC group in the SOD result (p<0.05). These findings demonstrated that GYB may have a protective effect against TCDD-induced liver toxicity in rats.
This study was to compare the effects of dietary n-6 and n-3 fatty acids and fat unsaturation on plasma lipids and chemical composition of VLDL and LDL fraction and lipogenic enzymes activity in rat liver under the conditions providing 1) a similar amount of n-6, n-3 fatty acids(LA, ALA, EPA+DHA) in diets and 2) the various degree of fat unsaturation. Male Sprague-Dawley rats weighing 420g were treated for 6-n with six experimental diets providing 25% of energy as fat and which were different only in fatty acid composition. The fats used for a source of each fatty acid were beet tallow for saturated fatty acid corn oil for n-6 linoleic acid(LA) perilla oil for n-3 $\alpha$-linolenic acid(ALA) and fish oil n-3 eicosapentaenoic acid (EPA) and n-3 docosahexaenoic acid(DHA). Plasma cholesterol level was increased by corn oil to compare with beef tallow but was decreased by perilla oil or fish oil. Plasma TG level was significantly decreased by perilla oil or fish oil. Fish oil significantly reduced the level of HDL-Chol and the proportion of Chol in LDL fraction and that of TG in vVLDL fraction. Overall there was a singificant negative correlation between the level of each plasma lipid(Chol TG, VLDL-TG, LDL-C) and the degree of fat unsaturation. However this rerlationship is not always true when compared the hypolipidemic effect of each fatty acid at a similar level of fat unsaturation. There was a trend such taht glucose 6-P dehydrogenase 6-phosphogluconate dehydrogenase and malic enzyme activites were reduced by n-3 fatty acids. Perilla oil significantly increased the incorporation of c20:5 and c22:5 into liver tissue and fish oil suignificantly increased the incorporation of c20:5, c22:6 into liver tissue and the effect of long chain n-3 fatty acid incorporation was greater by fish oil. therefore the hypotriglyceridemic effect of n-3 fatty acid could be resulted from the interference of hepatic lipogenesis by long-chain n-3 fatty acids and the reduced proportion of TG in VLDL fraction and its effect was greater by n-3 EPA+DHA than n-3 ALA even though plasma Chol and TG levels were also influenced by the degree of dietary fat unsaturation.
The effects of dried leaf powders and water and ethanol extracts of persimmon and green tea on lipid metabolism, lipid peroxidation and antioxidative enzyme activity were investigated in 12-month-old rats. Forty-nine male Sprague-Dawley rats weighing 520$\pm$19g were blocked into seven groups according to body weight. Rats were raised for four weeks with control(no tea leaf powder or extracts) and experimental diets containing either 5%(w/w) dried leaf powders of persimmon(Diospyros kaki Thunb) or green tea(Camellia sinensis O. Ktze), or water or ethanol extract from equal amounts of each dried tea powder. Food intakes of all tea diet groups were higher than that of control. Weight gains and food efficiency ratios of all tea diet groups were not significantly different from those of control. All tea diets decreased plasma triglyceride level, especially, green tea powder and persimmon ethanol diets were more effective than other diet. All the tea diet groups showed decrease in liver triglyceride level, and persimmon powder and ethanol extract increased fecal triglyceride excretion. Plasma cholesterol levels of all the tea diet groups were not significantly different from the control, but control. Fecal cholesterliver cholesterol concegroups were significantlntrations of all tea y lower than that of ol excretions of persimmon powder, green tea ethanol extract, persommon ethanol extract and green tea ethanol extract groups were significantly higher than that of control. Plasma and liver thiobarbituric acid reactive substance(TBARS) concentrations of all the tea diet groups were lower than that of control. Especially, plasma TBARS concentrations of green tea powder and persimmon ethanol extract groups were sinificantly low. Red blood cell(RBC) superoxide dismutase(SOD) activities of persimmon ethanol extract and green tea water extract groups were increased, and RBC catalase activities of all experimental groups were not significantly different. RBC glutathione peroxidase(GSH-px) activities of persimmon ethanol extract, persimmon water extract and green tea powder groups were increased. Liver SOD activities of all the tea diet groups except green tea ethanol extract group were higher than that of control. Liver catalase activities of all experimental groups were not significantly different, and liver GSH-px activity of green tea powder group was significantly higher than that of control. In conclusion, dried leaf powders, and water and ethanol extracts of persimmon and green tea were effective in lowering lipid level, inhibiting lipid peroxidation and increasing antioxdative enzyme activities in 12-month-old rat. Green tea leaf powder with high contents of flavonoids and water soluble dietar fiber was most effective in lowering plasma triglyceride, cholesterol and TBARS level. (Korean J Nutrition 34(3) : 285~298, 2001)
The authors has observed the histopathologically and histochemically on the effect of the garlic and garlic oil to the liver and kidney of rats. In order to confirm the histochemical changes of the metabolism of polysaccarides, the periodic acid Schiff reaction was applied. The 30 albino adult male rats weighing about 150 grames from the National Institute of Health were housed individualy and devide into 3 experimental groups: Group C: stock diet group Group B: stock diet-garlic group Group A: stock diet-garlic oil group Group C was fed with stock diet only through out this experimental period, Group B was fed with stock diet supplemented with garlic homogenator to be 1%, and Group A was fed with stock diet supplemented with the garlic oil to 0.05%. The garlic oil used in this experiments was extracted by author. And all rats was fed during 10 weeks. The histopathological and histochemical results were shown in each figure. According to the all results, the following concIusions were drawn. 1) In the garlic oil administrated groups, congestion of the sinusoid was subsided and the liberation of the Kupffer's cells were observed. 2) In garlic administrated groups, fatty metamorphosis in hepatic cells, and slight liberation of Kupffer's cells in sinusoidal walls were observed. Connective tissue proliferation and collagen bundle were observed. 3) The connective tissue and blood vessel wall in portal area Were reacted intensely with PAS stain. The hepatic cells Were reacted intensely with PAS stain in control group and moderately or slightly in garlic and garlic oil administrated group. 4) There were no significant differences in collecting and Henle's loops in each groups, but narrowing of lumen of the distal tubules were observed in garlic oil administrated group. 5) The basement membrane of the tubules and the connective tissues of the vessel wall in Kideny were reacted intensely with PAS stain in each groups. In control and garlic administrated groups. the brush border of the proximal tubules were reacted intensely with PAS stain, but epithelium of the Heine's loop, proximal, distal and collecting tubules were reacted moderately. In garlic oil administrated-group, there were tendency of decreasing of PAS stain in each tubules.
This study was done to determine the effects of coix on the content of cholesterol. lipids, phosphoilpids, total bile acids in liver, plasma, and feces of rats fed containing 1% cholesterol. Four groups of experimental diets, such as soybean oil-starch diet, soybean oil-coix diet, lard-starch diet, lard-coix diet were fed ad libitum to the 6 weeks old white male rat of Spargue-Dawley strain for 27 days. The results obtained are summarized as follows: 1) Plasma cholesterol level of the lard-starch group was significantly higher than the other groups (p<0.05), and that of the lard-coix group was the lowest. The content of plasma triglyceride, total bile acids was not different among the lard-starch group was significantly higher than the other groups(p<0.05). 2) The contents of the liver lipids, cholesterol, and triglycerides of the lard-coix group were significantly lower than the other groups(p<0.05). The contents of phospholipid of the liver of the lard-starch group was significantly lower than the other groups(p<0.05), and those of the soybean oil-coix group and the lard-coix group were high. 3) The contents of intestinal lipids, triglyceride, and phospholipid of the lard-coix group were significantly lower than the other groups(p<0.05). The contents of the intestinal tissue cholesterol of the lard-coix group was significantly lower than the other groups(p<0.05). 4) Cholesterol content of the feces was not different among the experimental groups. Triglyceride content of the feces of the soybean oil-starch group was significantly higher than the other groups, but total bile acid content of the feces was not different among the experimental groups. 5) Dry matter digestibility was not different among the experimental groups, but cholesterol retention was rather low when soybean oil-diet was fed. The results of this study reveales that coix has an effect to lower the plasma cholesterol level. Coix were decreased the content of liver cholesterol, increased the contend of liver phospholipid, and induced triglyceride excretion of the feces in the lard diet which lead to hypercholesterolemia. It could be suggested that the coix has influesced liped metabolsim in body.
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