Seo, Bo-Young;Kim, Jung-Mi;Lee, Seung-Cheol;Park, Eun-Ju
Journal of the Korean Society of Food Science and Nutrition
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v.38
no.7
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pp.839-845
/
2009
Colorectal cancer is the third most common malignant neoplasm in the world. Much attention has been focused on reducing colon cancer risk through medical properties of natural compound that could act as anticarcinogens. In this study, we evaluated the antioxidant and antigenotoxic effects of Styela plicata (S. plicata) from in vitro experiments. S. plicata extracts showed antioxidant activity measured by TRAP assay and antigenotoxic effect in $200{\mu}M$$H_2O_2$ induced DNA damage in human leukocytes. Especially, freeze-dried S. plicata extracted with methanol showed the highest level of TRAP (0.225 mM) and inhibition of DNA damage (66.8%). Additionally we observed the effect of S. plicata on the formation of aberrant crypt foci (ACF) induced by dimethylhydrazine (DMH) and DMH induced DNA damage (by comet assay) in male SD rats. The animals were divided into three groups and fed high-fat and low fiber diet (100 g lard+20 g cellulose/kg diet) without (normal control and DMH control) or with a 3% (w/w) of lyophilized S. plicata powder (DMH+S. plicata). One week after beginning the diets, rats were treated with DMH (30 mg/kg, s.c.) for 6 weeks except for normal control group, which was treated saline instead; dietary treatments were continued for the entire experiment. Nine weeks after DMH injection, administration of S. plicata resulted in reduction of ACF numbers, to 82.7% of the carcinogen control value ($7.67{\pm}2.04$ vs. $1.33{\pm}0.53$: p<0.01). S. plicata supplementation induced antigenotoxic effect on DMH-induced DNA damage in the blood cell (% tail intensity: $6.79{\pm}0.26$ vs. $6.13{\pm}0.22$). These data indicate that S. plicata extract has antigenotoxic and anticarcinogenic effects from in vitro experiments and S. plicata exerts a protective effect on the process of colon carcinogenesis, possibly by suppressing the DMH-induced DNA damage in blood cell and the development of preneoplastic lesions in colon.
Cho, Eun Jung;Park, Ji Ae;Choi, Eun Sik;Sohn, Sea Hwan
Korean Journal of Poultry Science
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v.43
no.2
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pp.77-88
/
2016
To establish a new synthetic Korean meat chicken breed, we tested $5{\times}5$ diallel cross mating experiment with domestic chicken breeds. Comparing stress responses among diallel crossed chicken breeds, we analyzed telomere length, DNA damage and expressions of heat shock protein genes (HSPs) as the markers of the stress response. The telomere length was measured by quantitative fluorescence in situ hybridization on the nuclei of lymphocytes. The expression levels of HSP-70, $HSP-90{\alpha}$ and $HSP-90{\beta}$ genes were analyzed by quantitative real-time polymerase chain reaction in lymphocytes. The DNA damage rate of lymphocytes was quantified by the comet assay known as the single cell gel electrophoresis. In results, there were significant differences in the values of the stress markers such as telomere length, HSPs and DNA damage rate, and also were significant differences in viabilities and body weights among the $5{\times}5$ diallel crossed chicken breeds. The telomere shortening rate, expression values of HSPs and DNA damage rate were significant low in W and Y crossed chickens compare to the others, but GG pure breed showed the highest values in the 25 crossed chickens. Estimating correlation coefficient, the survival rate positively correlated to telomere length, but negatively correlated to the expression levels of HSP-70, $HSP-90{\alpha}$, $HSP-90{\beta}$ genes and to the value of % DNA in tail as DNA damage rate. The expression levels of HSP-70, $HSP-90{\alpha}$ and $HSP-90{\beta}$ genes of dead chickens had significantly higher than those of survival chickens. According to the results on the stress marker analysis, it would be considered that the crossed breeds had more stress resistant than the pure breeds, and the crossed chickens with a light strain such as W or Y were relatively resistant to stress, but the crossed chickens with a heavy strain such as G, H, F were susceptible to stress.
Lee, Seung Young;Jung, Ji Young;Choi, Hee Won;Choi, Kyung Min;Jeong, Jin-Woo
Proceedings of the Plant Resources Society of Korea Conference
/
2018.10a
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pp.103-103
/
2018
Oenothera biennis, commonly known as evening primrose, a potential source of natural bioactive substances: flavonoids, steroids, tannins, fatty acids and terpenoids responsible for a diverse range of pharmacological functions. However, whether extract prepared from aerial part of O. biennis (APOB) protects skin against oxidative stress remains unknown. To investigate the protective effects of APOB against oxidative stress-induced cellular damage and elucidated the underlying mechanisms in the HaCaT human skin keratinocytes. Our results revealed that treatment with APOB prior to hydrogen peroxide ($H_2O_2$) exposure significantly increased viability, and the highest DPPH radical-scavenging activities and reducing power of HaCaT cells. APOB also effectively attenuated H2O2-induced comet tail formation and inhibited the $H_2O_2$-induced phosphorylation levels of the histone ${\gamma}H2AX$, as well as the number of apoptotic bodies and Annexin V-positive cells. In addition, APOB exhibited scavenging activity against intracellular reactive oxygen species (ROS) accumulation and restored the mitochondrial membrane potential loss by $H_2O_2$. Moreover, $H_2O_2$ enhanced the cleavage of caspase-3 and degradation of poly (ADP-ribose)-polymerase (PARP), a typical substrate protein of activated caspase-3, as well as DNA fragmentation; however, these events were almost totally reversed by pretreatment with APOB. Furthermore, APOB increased the levels of heme oxygenase-1 (HO-1), which is a potent antioxidant enzyme, associated with the induction of nuclear factor-erythroid 2-related factor 2 (Nrf2). According to our data, APOB is able to protect HaCaT cells from $H_2O_2$-induced DNA damage and cell death through blocking cellular damage related to oxidative stress through a mechanism that would affect ROS elimination and activating the Nri2/HO-1 signaling pathway.
Park, Jae-Hee;Kim, Jung-Mi;Park, Eun-Ju;Lee, Kyung-Hea
Journal of the Korean Society of Food Science and Nutrition
/
v.37
no.10
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pp.1244-1250
/
2008
This study was carried out investigate the effects of chungkukjang added with onion (OC) and chungkukjang (C) on the lipid and antioxidant metabolisms of hypercholesterolemic rats. Thirty-two male Sprague-Dawley rats were divided into four groups after 1-week adaptation period and were fed a normal diet, high fat-cholesterol diet (HC), HC-OC or HC-C for 8 weeks, respectively. The supplementation of HC-OC and HC-C groups significantly reduced hepatic total cholesterol and AST activity. HC-C group increased high density lipoprotein, while decreasing low density lipoprotein and AI compared with HC-OC group. Conjugated dienes of HC-C group was significantly lower than those of HC-OC group. $H_2O_2$ induced DNA damage reduced significantly in HC-OC and HC-C groups compared with high fat-cholesterol diet group. $H_2O_2$ induced DNA damage exhibited significant positive correlations with hepatic total cholesterol, AST and CD. These results suggested that supplementation of chungkukjang or chungkukjang added with onion might be helpful in preventing lipid oxidation and leukocytic DNA damage. However, the health beneficial effect has not improved by the addtion of onion in chungkukjang.
Jo, Sung-Kee;Oh, Heon;Cheon, Eui-Hyun;Jeong, U-Hee;Cho, Nam-Jeong
Journal of the Korean Society of Food Science and Nutrition
/
v.33
no.1
/
pp.22-27
/
2004
In the present study, the protective effects of Artemisia capillaris (AC) on the DNA damage induced by $^{60}$ Co ${\gamma}$-rays were evaluated using alkaline single-cell gel electrophoresis (SCGE, comet assay) in the mouse peripheral lymphocytes and micronuclei (MN) formation test in the Chinese hamster ovary (CHO) cells. We also investigated the effect of AC on 8-hydroxy-2'-deoxyguanosine (8-OHdG) formation in the mouse liver and thymus exposed to ${\gamma}$-ray, The tail moment and the frequency of MN, which were markers of DNA damage in the SCGE and MN formation test, were decreased in the groups treated with AC extract before exposure to 200 cGy of ${\gamma}$-ray. We also observed its activities, lowering 8-OHdG level, an index of oxidative DNA damage, in the groups treated with AC extract before whole body ${\gamma}$-irradiation (800 cGy). It is plausible that scavenging of free radicals by AC may have played an important role in providing the protection against the radiation-induced damage to the DNA. These results indicated that AC protects the DNA damage induced by ${\gamma}$-rays and might be a useful radioprotector, especially since it is a relatively nontoxic product.
Objectives : Oxidative stress due to excessive accumulation of reactive oxygen species (ROS) is one of the risk factors for the development of several chronic diseases, including neurodegenerative diseases. Methods : In the present study, we investigated the protective effects of cheongnoemyeongsin-hwan (CNMSH) against oxidative stress‑induced cellular damage and elucidated the underlying mechanisms in neuronal-derived SH-SY5Y cells. Results : Our results revealed that treatment with CNMSH prior to hydrogen peroxide (H2O2) exposure significantly increased the SH-SY5Y cell viability, indicating that the exposure of the SH-SY5Y cells to CNMSH conferred a protective effect against oxidative stress. CNMSH also effectively attenuated H2O2‑induced comet tail formation, and decreased the phosphorylation levels of the histone ${\gamma}H2AX$, as well as the number of apoptotic bodies and Annexin V‑positive cells. In addition, CNMSH exhibited scavenging activity against intracellular ROS generation and restored the mitochondria membrane potential (MMP) loss that were induced by H2O2, suggesting that CNMSH prevents H2O2‑induced DNA damage and cell apoptosis. Moreover, H2O2 enhanced the cleavage of caspase-3 and degradation of poly (ADP-ribose)-polymerase, a typical substrate protein of activated caspase-3, as well as DNA fragmentation; however, these events were almost totally reversed by pretreatment with CNMSH. Furthermore, CNMSH increased the levels of heme oxygenase-1 (HO-1), which is a potent antioxidant enzyme, associated with the induction of nuclear factor-erythroid 2-related factor 2 (Nrf2). According to our data, CNMSH is able to protect SH-SY5Y cells from H2O2-induced apoptosis throughout blocking cellular damage related to oxidative stress through a mechanism that would affect ROS elimination and activating Nrf2/HO-1 signaling pathway. Conclusions : Therefore, we believed that CNMSH may potentially serve as an agent for the treatment and prevention of neurodegenerative diseases caused by oxidative stress.
The single cell gel electrophoresis (SCGE) assay is a microelectrophoretic technique for assessments of DNA damage at the level of the individual eukaryotic cell. The SCGE assay, due to its simplicity, sensitivity and need of a few cells, has advantages compared to other genomic damage assays such as sister chromatid exchange, chromosomal aberration and micronucleus test. In this study, investigated were the levels of DNA damage and the repair kinetics in the coelomocytes of Eisenia fetida treated with HgCl2 and ionizing radiation by means of the SCGE assay. For detecting DNA damage and repair in coelomocytes, earthworms (E. fetida) were irradiated with six doses of ${\gamma}$-rays (0, 2.5, 5, 10, 20 and 50 Gy) and in vivo exposed to mercuric chloride at 0, 80 and 160 mg $kg^{-1}$ for 48 hours. Then the Olive tail moments were measured during 0~12 hours after irradiation and 0~72 hours after Hg treatment. The results showed that the more the oxidative stress was induced by mercury and radiation, the longer the repair time was required. Also, the results suggest that the SCGE assay may be used as an important tool for comparison of the sensitivity of different species to oxidative stresses.
Seo, Mi-Ja;Lee, Hee-Jin;Kang, Eun-Jin;Kang, Si-Yong;Yu, Yong-Man;Youn, Young-Nam
Korean journal of applied entomology
/
v.50
no.4
/
pp.335-342
/
2011
The effects of gamma irradiation on the survival, development, fecundity, and sex ratio of the multicolored Asian ladybird beetle (Harmonia axyridis) were investigated. A dose of more than 50 Gy dose of irradiation on eggs completely inhibited hatch, and 1st and 3rd instar larva irradiated with over 40 Gy almost died. Adverse effects of gamma irradiation over 70 Gy were also observed in the survival and development of pupae and adults. Although irradiated individuals usually survived, they had longer periods of larval and pupal development than untreated individuals. Slight female-biased sex ratios were observed in some treatments. However, sex ratio differences soon equilibrated. Generally, inherited harmful effects of gamma irradiation were observed in F1 and F2 generations. Comet tail indicating DNA damage was showed in survival individuals exposed to gamma irradiation.
The $Na^+/H^+$ exchanger is responsible for maintaining the acidic tumor microenvironment through its promotion of the reabsorption of extracellular $Na^+$ and the extrusion of intracellular $H^+$. The resultant increase in the extracellular acidity contributes to the chemoresistance of malignant tumors. In this study, the chemosensitizing effects of cariporide, a potent $Na^+/H^+-exchange$ inhibitor, were evaluated in human malignant mesothelioma H-2452 cells preadapted with lactic acid. A higher basal level of phosphorylated (p)-AKT protein was found in the acid-tolerable H-2452AcT cells compared with their parental acid-sensitive H-2452 cells. When introduced in H-2452AcT cells with a concentration that shows only a slight toxicity in H-2452 cells, cariporide exhibited growth-suppressive and apoptosis-promoting activities, as demonstrated by an increase in the cells with pyknotic and fragmented nuclei, annexin V-PE(+) staining, a $sub-G_0/G_1$ peak, and a $G_2/M$ phase-transition delay in the cell cycle. Preceding these changes, a cariporide-induced p-AKT down-regulation, a p53 up-regulation, an ROS accumulation, and the depolarization of the mitochondrial-membrane potential were observed. A pretreatment with the phosphatidylinositol-3-kinase (PI3K) inhibitor LY294002 markedly augmented the DNA damage caused by the cariporide, as indicated by a much greater extent of comet tails and a tail moment with increased levels of the p-histone H2A.X, $p-ATM^{Ser1981}$, $p-ATR^{Ser428}$, $p-CHK1^{Ser345}$, and $p-CHK2^{Thr68}$, as well as a series of pro-apoptotic events. The data suggest that an inhibition of the PI3K/AKT signaling is necessary to enhance the cytotoxicity toward the acidtolerable H-2452AcT cells, and it underlines the significance of proton-pump targeting as a potential therapeutic strategy to overcome the acidic-microenvironment-associated chemotherapeutic resistance.
Journal of the Korean Society of Food Science and Nutrition
/
v.40
no.2
/
pp.149-155
/
2011
The objective of this study was to evaluate the antioxidant and antigenotoxic activities of sansuyu fruit (Corni fructus, CF) at temperatures of $25^{\circ}C$, $50^{\circ}C$, and $90^{\circ}C$ using a water extraction method. Total phenolic content (TPC), DPPH radical-scavenging activity (RSA), and superoxide dismutase (SOD)-like activity, and ORAC (Oxygen radical absorbance capacity) values were determined. Also the antigenotoxicity of CF was determined by measuring inhibitory effects of $H_2O_2$ induced DNA damage in human leukocytes using the comet assay. The TPC in the CF extracts was 4.2, 4.6, and 5.5 g/100 g GAE in $25^{\circ}C$, $50^{\circ}C$, and $90^{\circ}C$, respectively. The DPPH RSA of the CF extracts increased in a dose-dependent manner over the range of $50\sim1000\;{\mu}g$/mL in all temperatures and the $SC_{50}$ of DPPH RSA of the CF extracts were not significantly different at different extraction temperatures. The $SC_{50}$ of SOD-like was the highest in CF extracted at $25^{\circ}C$ (1.1 mg/mL) followed by $90^{\circ}C$ (1.2 mg/mL) and $50^{\circ}C$ (1.3 mg/mL). The ORAC values of the CF extracts were not significantly different in low concentration ($10\;{\mu}M$/mL) and was in order of $25^{\circ}C$ ($5.7\;{\mu}M$ TE)< $90^{\circ}C$ ($6.2\;{\mu}M$ TE)< $50^{\circ}C$ ($8.5\;{\mu}M$ TE) in high concentration ($50\;{\mu}M$/mL). $200\;{\mu}M$$H_2O_2$ induced DNA damages in human leukocytes were significantly reduced by the pretreatment with the CF extracts. These results suggest that sansuyu fruit (Corni fructus) can be used as a natural source for antioxidant activities and as antigenotoxic agents regardless of the water extraction temperature.
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