Journal of the Korean Society of Food Science and Nutrition
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v.31
no.1
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pp.124-130
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2002
The present study was carried out to investigate the pretreatment of effects of water extract obtained from Eucommia ulmoides leaf (ELE) on hepatotoxicity of carbon tetrachloride ($CCl_4$) -treated rats. Thirty two healthy male Sprague-Dawley rats were divided into four groups, i.e. normal group (N), $CCl_4$-treated group (T), ELE-treated group (E), and ELE-treated group after injection of $CCl_4$(TE). The administration of $CCl_4$increased the activities of aspartate aminotransferase, alanine aminotransferase and lactate dehydrogenase in serum, but their activities were significantly decreased by the addition of ELE. Alkaline phosphatase activity in serum was significantly decreased in $CCl_4$-treated group, while the activity was not decreased by the extracts. Higher levels of HDL cholesterol was found in E and TE group which showed lower levels of total and LDL-cholesterol. Histopathologic findings by light microscopic examination showed fatty change, ballooning degeneration, acidophilic degeneration, spotty necrosis and zonal necrosis in $CCl_4$treated liver tissue. But the degree of liver damage was not identified in liver tissue of the TE group. These results indicated that Eucommia ulmoides leaf water extracts led migtigation of liver demage induced with $CCl_4$.
1. The effects of heat stress (38$^{\circ}C$), cold stress (4$^{\circ}C$) and extreme cold stress (-20$^{\circ}C$) before slaughter on the tenderness and postmortem glycolysis if the excised chicken breast muscle were studied Heat stress significantly (p 0.05) increased the toughness of breast muscle. Though statistically not significant, cold stress also adversely affected the tenderness. The heat-stressed birds showed higher zero hr glycogen higher zero hr pH and significantly (p 0.05) love. ultimate pH then the controls. The cold-stressed birds showed intermediate values in these parameters. Highly significant correlations. were observed between shear value and each of these three parameters. Glycolysis rate ana final moisture content were minor factors which affected the muscle tenderness to a limited extent. The slightly elevated lactate-dehydrogenase and creatine phosphokinase activities in serum and breast muscle of stressed birds failed to account for any variations in tenderness. 2. Chicken breast and thigh muscles were subjected to different environmental temperatures to determine if the phenomenon of cold shortening exists in chicken muscle. For both breast and thigh muscles, minimum shortening was observed in the 4-10$^{\circ}C$t range. Muscles held at 0$^{\circ}C$ showed a slightly higher extent of shortening than at 4$^{\circ}C$; where as muscles held at above 20$^{\circ}C$ showed a severe shortening effect. It was concluded that no apparent cold shortening was detected in chicken muscle except at 0$^{\circ}C$ and even at 0$^{\circ}C$ and even at 0$^{\circ}C$ the extent of shortening was of a small magnitude compared to bovine muscles. Since high temperature induces a much greater shortening, muscle temperature must be lowered to below 20$^{\circ}C$ as early as possible to prevent excessive muse]e shortening.
Objectives : This study was performed to investigate the inhibitory effects of Cheongshimyeonja-tang water extracts(CSYJ) on high fat diet-induced obesity and hyperlipidemia in C57BL/6J mice. Methods : The experimental animals were divided into four groups; normal diet-fed control(ND), high fat diet-fed control(HFD), HFD+CSYJ 150 mg/kg(CSYJ 150), and HFD+CSYJ 300 mg/kg(CSYJ 300). Obesity with hyperlipidemia was induced by feeding high fat diet(40%), and CSYJ was administrated orally into mice every day for 5 weeks. The effect of CSYJ on the serological parameters for Obesity with hyperlipidemia was evaluated. Results : CSYJ-treated groups revealed significantly reduced body weight and feed intake, as well as feed efficiency ratio, compared to HFD-fed group in dose-dependent manner. CSYJ reduced significantly the serum levels of triglyceride, total cholesterol and LDL-cholesterol elevated by intake of high fat diet feed, while the increased serum levels of HDL-cholesterol attenuated levels of atherogenic index and cardiac risk factor. It also reduced the blood levels of insulin and leptin in HFD group, and inhibited lipid accumulation in organs such as liver and abdomal adipose tissue. Moreover oral administration of CSYJ decreased significantly the blood level of alanine aminotransferase(ALT), aspartate aminotransferase(AST) and lactate dehydrogenase(LDH), and lipid peroxide(LPO), compared to HFD-fed group in dose-dependent manner. Conclusions : These results indicate that CSYJ could reduce high fat diet-induced obesity and hyperlipidemia, suggesting its clinical usefulness for declining body fat and hyperlipidemia.
Chlamydiae, obligate intracellular bacteria, are associated with a variety of human diseases. The chlamydial life cycle undergoes a biphasic development: replicative reticulate bodies (RBs) phase and infectious elementary bodies (EBs) phase. At the end of the chlamydial intracellular life cycle, EBs have to be released to the surrounded cells. Therefore, the interactions between Chlamydiae and cell death pathways could greatly influence the outcomes of Chlamydia infection. However, the underlying molecular mechanisms remain elusive. Here, we investigated host cell death after Chlamydia infection in vitro, in L929 cells, and showed that Chlamydia infection induces cell necrosis, as detected by the propidium iodide (PI)-Annexin V double-staining flow-cytometric assay and Lactate dehydrogenase (LDH) release assay. The production of reactive oxygen species (ROS), an important factor in induction of necrosis, was increased after Chlamydia infection, and inhibition of ROS with specific pharmacological inhibitors, diphenylene iodonium (DPI) or butylated hydroxyanisole (BHA), led to significant suppression of necrosis. Interestingly, live-cell imaging revealed that Chlamydia infection induced lysosome membrane permeabilization (LMP). When an inhibitor upstream of LMP, CA-074-Me, was added to cells, the production of ROS was reduced with concomitant inhibition of necrosis. Taken together, our results indicate that Chlamydia infection elicits the production of ROS, which is dependent on LMP at least partially, followed by induction of host-cell necrosis. To our best knowledge, this is the first live-cell-imaging observation of LMP post Chlamydia infection and report on the link of LMP to ROS to necrosis during Chlamydia infection.
ATP-sensitive $K^+$ channels ($K_{ATP}$) are major component of preventing ischemia-reperfusion injury. However, there is little information regarding to the expressional difference of $K_{ATP}$ and its function between left and right ventricles. In this study, we measured the lactate dehydrogenase release of rabbit heart slices in vitro and determined the difference of the $K_{ATP}$ expression at the both ventricles by measuring the level of $K_{ATP}$-forming Kir6.2 (OcKir6.2) mRNA using in situ hybridization. The hearts were preconditioned with 15 min hypoxia and reoxygenated for 15 min before a hypoxic period of 60 min, followed by reoxygenation for 180 min. With hypoxic preconditioning (100% $N_2$) with 15 min, left ventricles (LV) showed higher release of LDH comparing with right ventricles (RV). Adding $K_{ATP}$ blocker glibenclamide ($10{\mu}M$) prior to a hypoxic period of 60 min, hypoxic preconditioning effect of RV was more abolished than LV. With in situ hybridization, the optical density of OcKir6.2 was higher in RV. Therefore, we suggest that different $K_{ATP}$ expression between LV and RV is responsible for the different response to hypoxia and hypoxic preconditioning of rabbit hearts.
Jo, Yun Ho;Lee, Hwan;Oh, Myeong Hwan;Lee, Gyeong Hee;Lee, You Jin;Lee, Ji Sun;Kim, Min Jung;Kim, Won Yong;Kim, Jin Seong;Yoo, Dae Seok;Cho, Sang Won;Cha, Seon Woo;Pyo, Mi Kyung
Nutrition Research and Practice
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v.14
no.4
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pp.334-351
/
2020
BACKGROUND/OBJECTIVES: This study was designed to investigate the improvement effect of white ginseng extract (GS-KG9) on D-galactosamine (Ga1N)-induced oxidative stress and liver injury. SUBJECTS/METHODS: Sixty Sprague-Dawley rats were divided into 6 groups. Rats were orally administrated with GS-KG9 (300, 500, or 700 mg/kg) or silymarin (25 mg/kg) for 2 weeks. The rats of the GS-KG9- and silymarin-treated groups and a control group were then intraperitoneally injected Ga1N at a concentration of 650 mg/kg for 4 days. To investigate the protective effect of GS-KG9 against GalN-induced liver injury, blood liver function indicators, anti-oxidative stress indicators, and histopathological features were analyzed. RESULTS: Serum biochemical analysis indicated that GS-KG9 ameliorated the elevation of aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP), and lactate dehydrogenase (LDH) in GalN-treated rats. The hepatoprotective effects of GS-KG9 involved enhancing components of the hepatic antioxidant defense system, including glutathione, glutathione peroxidase (GPx), superoxide dismutase (SOD), and catalase (CAT). In addition, GS-KG9 treatment inhibited reactive oxygen species (ROS) production induced by GalN treatment in hepatocytes and significantly increased the expression levels of nuclear factor erythroid-2-related factor 2 (Nrf2) and heme oxygenase-1 (HO-1) proteins, which are antioxidant proteins. In particular, by histological analyses bases on hematoxylin and eosin, Masson's trichrome, α-smooth muscle actin, and transforming growth factor-β1 staining, we determined that the administration of 500 mg/kg GS-KG9 inhibited hepatic inflammation and fibrosis due to the excessive accumulation of collagen. CONCLUSIONS: These findings demonstrate that GS-KG9 improves GalN-induced liver inflammation, necrosis, and fibrosis by attenuating oxidative stress. Therefore, GS-KG9 may be considered a useful candidate in the development of a natural preventive agent against liver injury.
Lee, Bo Kyung;Choe, Lira;Lee, Ji In;Lee, Doo Yi;Chang, Sun-Young;Kim, So Hee;Jung, Yi-Sook
Journal of the Korean Society of Food Science and Nutrition
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v.46
no.2
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pp.161-168
/
2017
In this study, we examined the effect of Perilla frutescens extract (PFE) on oxidative stress-induced cell death in RGC-5 cell lines. Staurosporine-differentiated RGC-5 (ssdRGC-5) cells obtained by treating RGC-5 cells with $1{\mu}M$ staurosporine were incubated with PFE for 30 min and then exposed to buthionine sulfoximine plus glutamate (B/G) for 20 h. Cell death was detected using lactate dehydrogenase release assay and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide reduction assay. To investigate the mechanism underlying cell death, we determined caspase-3 activity, level of reactive oxygen species (ROS) formation, and expression levels of cytoplasmic cytochrome c and mitochondrial Bax. Treatment of ssdRGC-5 cells with B/G increased intracellular ROS and induced apoptosis with increasing caspase-3 activity. PFE rescued ssdRGC-5 cells from oxidative stress-induced cell death by inhibiting intracellular ROS production and caspase-3 activation and regulating apoptosis-related proteins such as cytochrome c and Bax. These findings suggest that PFE may have a beneficial neuroprotective effect against oxidative stress-induced apoptotic death in ssdRGC-5 cells.
Purpose : There is a predilection for subacute necrotizing lymphadenitis(SNL) in young Asian women. Few pediatric cases have been reported. This study was performed to evaluate clinical features of children with SNL. Methods : We retrospectively analyzed clinical features of 23 cases of SNL under 15 years of age identified in Nowon Eulji Hospital from February 1995 to January 2002. Two cases were diagnosed by excisional biopsy and 21 cases by fine needle aspiration. Results : The ages ranged from 14 months to 14 years(mean $8.1{\pm}3.8$ years). The male to female ratio was 1 : 1.6. Ten cases(10/23) were diagnosed in 2000. The onset was more frequent in spring. The common presenting symptoms were neck mass(22/23), pain(12/20) and fever(8/18). Fever subsided within two weeks in seven out of eight and lymphadenopathy resolved within five months in 14 out of 15. The mean WBC count was $7,664{\pm}3,454/mm^3$. Elevated levels of ESR(10/ 12) and lactate dehydrogenase(5/6) and positive reaction for CRP(3/4) were frequent. Radiologically measured greatest diameter of the enlarged lymph nodes was less than 2 cm in 14 out of 15. One case occurred in a child with alopecia areata and one case with type 1 diabetes. Clinical outcomes were good in 23 cases. Conclusion : SNL should be considered in children with cervical lymphadenopathy regardless of fever or pain. SNL seems not rare in pediatric groups in Korea.
1. Objectives: Yeolda-Hanso tang (YH) has long been used as traditional herbal formula in Korea as various diseases. Now we modified Yeolda-Hanso tang (YH) for neurodegenerative diseases treatment and named New-Yeolda-Hanso tang (NYH). We investigated neuroprotective effects of NYH on NGF-differentiated PC12 cells cytotoxicity induced by $\beta$-Amyloid peptide (A$\beta$25-35) and evaluated the ability of NYH to prevent and treat for neurodegenerative diseases via autophagy enhancement. 2. Methods and Results: 1) Protective effect of NYH on PC12 cells cytotoxity induced by A$\beta$25-35. PC12 cells survival was measured by MTT and lactate dehydrogenase (LDH) assay. $20{\mu}M$$\beta$-Amyloid peptide (A$\beta$25-35) induced cytotoxicity on NGF-differentiated PC12 cells. NYH attenuated the cytotoxic effects of A$\beta$25-35 in a dose-dependent manner. 2) Pharmacological induction of Autophagy by NYH in PC12 cells Autophagy induction and activation was measured by immunoblot assay. Marker of autophagy, LC3 II expression and the ratio of LC3-II/I was slightly increased in the protein treated with YH, and significantly augmented in the protein treated with NYH. NYH-induced increase of LC3-II protein level was inhibited by 3MA. 3) Induction of Autophagy by NYH on A$\beta$25-35-induced injury in PC12 cells In MTT assay, $100{\mu}g/ml$ re-treated NYH attenuated $20{\mu}M$ A$\beta$25-35-induced cytotoxicity in PC12 cells. Protection effect of NYH was blocked by autophagy inhibitor 3MA. In immunoblot assay, $1200{\mu}g/ml$ pre-treated NYH activated autophagy in $20{\mu}M$ A$\beta$25-35-induced cytotoxicity in PC12 cells. The observed effect was partially blocked by 3MA. 3. Conclusions: All the results indicated that NYH possesses neuroprotective potential partially mediated by autophagy enhancement and NYH may be considered to be a promising new herbal formula to prevent and treat for neurodegenerative diseases including Alzheimer's disease (AD).
The objectives of this study were to examine the lung injury and inflammation caused by manual metal arc stainless steel(MMA-SS) welding fume inhalation and to evaluate the recovery process. Sprague-Dawley rats were exposed to MMA-SS welding fumes for 2 h per day in a whole-body exposure chamber, with a total suspended particulate(TSP) concentration of $51.4{\pm}2.8mg/m^3$(low dose) or $84.6{\pm}2.9mg/m^3$(high dose) for 30 days. The animals were sacrificed after 30 days of exposure as well as after a 30-day recovery period. To assess the inflammatory or injury responses, cellular and biochemical parameters as well as cytokines were assayed in the bronchoalveolar lavage fluid(BALF). MMA-SS welding fume exposure led to a significant elevation in the number of alveolar macrophages(AM) and polymorphonuclear cells(PMN). Additionary, the values of $\beta$-n-acetyl glucosaminidase($\beta$-NAG) and lactate dehydrogenase(LDH) in the BALF were increased in the exposed group when compared to controls. After 30 days of recovery from exposure, a significant reduction in inflammatory parameters of BALF was observed between the exposed and recovered groups. Slight, but significant elevations were noted in the number of AM and PMN in the recovered groups, and AM that had been ingested fume particles still remain in the lungs. In conclusion, these results indicated that welding fumes induced inflammatory responses and cytotoxicity in the lungs of exposed rats. Fume particles were not fully cleared from lungs even after a 30-day recovery period.
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