• 생명과학회지
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• 제13권2호
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• pp.230-235
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• 2003

Bromobenzene으로 간독성을 유발한 흰쥐에 생열귀나무 뿌리를 투여하여 bromobenzene 대사계에 미치는 효소활성을 관찰하였다. Bromobenzene은 bromobenzene 2,3-oxide와 bromobenzene-3, 4-oxide로 전환되며, 3,4-oxide는 독성물질로서 epoxide hydrolase에 의해 무독성 bromobenzene-3,4-dihyrodiol로 대사 또는 glutathione S-transferase에 의하여 배설되기도 한다. 중국 민간에서 강장제로 사용하는 생열귀나무는 한방에서 소화불량, 위통 등의 치료에 사용되는 약용식물이다. 생열귀나무의 뿌리 추출물은 흰쥐의 간 epoxide 생성계에 관여하는 aminopyrine N-demethylase, aniline hydroxylase 활성과 epoxide를 대사시키는 glutathione S-transferase 활성에는 변화를 주지 않았다. 그러나 생열귀추출물 500 mg/kg 경구투여군은 eporide를 무독화시키는 epoxide hydrolase 활성에서 bromobenzene 투여로 효소활성이 저하된 대조군보다 33% 활성을 회복시켰다. 따라서 생열귀나무 뿌리는 간독성물질인 bromobenzene 대사에 관여하는 epoxide hydrolase 활성 증가로 인해 간보호작용이 일어나는 것으로 판단된다.

• Bulletin of the Korean Chemical Society
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• 제28권5호
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• pp.772-776
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• 2007

In order to study the role of residue in the active site of glutathione S-transferase (GST), Arg13 residue in human GST P1-1 was replaced with alanine, lysine and leucine by site-directed mutagenesis to obtain mutants R13A, R13K and R13L. These three mutant enzymes were expressed in Escherichia coli and purified to electrophoretic homogeneity by affinity chromatography on immobilized GSH. Mutation of Arg13 into Ala caused a substantial reduction of the specific activity by 10-fold. Km GSH, Km DCNB and Km EPNP values of R13A were approximately 2-3 fold larger than those of the wild type. Mutation of Arg13 into Ala also significantly affected I50 values of S-methyl-GSH that compete with GSH and ethacrynic acid, an electrophilic substrate-like compound. These results appeared that the substitution of Arg13 with Ala resulted in significant structural change of the active site. Mutation of Arg13 into Leu reduced the catalytic activity by approximately 2-fold, whereas substitution by Lys scarcely affected the activity, indicating the significance of a positively charged residue at position 13. Therefore, arginine 13 participates in catalytic activity as mainly involved in the construction of the proper electrostatic field and conformation of the active site in human GST P1-1.

• Preventive Nutrition and Food Science
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• 제5권3호
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• pp.126-130
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• 2000

To enhance the antitumor activity of Chinese cabbage kimchi, four kinds of kimchi, which ere differently prepared in kinds and levels of sub-ingredients, were fermented at 15$^{\circ}C$ for 1 day and then at 5$^{\circ}C$ up to pH 4.3. The solid tumor formation, hepatic glutathione S-transferase activity and glutathione contents in the liver, and natural killer (NK) cell activity of spleen were determined from the sarcoma-180 cell injected Balb/c mice that were treated with methanol extracts of the kimchi samples. Kimchi IV, prepared with organically cultivated Chinese cabbage, red pepper powder, garlic, Chinese pepper powder mustard leaf and heat processed salt (Gueun salt), reduced the tumor formation by 39.3% compared to the sarcoma-180 cell treated group, resulting in the smallest tumor weight. Methanol extracts of the kimchi III and kimchi IV recovered the activities of hepatic glutathione S-transferase(GST) that was decreased by the transplantation of the sarcoma-180 cells to th mice. The injections of methanol extracts of kimchi II and kimchi IV increased glutathione contents in sarcoma-180 cells treated mice. The methanol extract of kimchi IV increased the natural killer (NK) cell activity of spleen lymphocytes a more effectively (p<0.05) than those the other kimchi samples. These results suggest that the anticancer activities of kimchi can be increased by changing the kinds and levels of sub-ingredients.

• Korean Journal of Acupuncture
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• 제18권1호
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• pp.1-9
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• 2001

애엽으로 약침액을 조제하여 암예방 효과를 살펴 본 결과 다음과 같은 결론을 얻었다. 애엽 약침액으로 10일간 전투여한 후 Ehrlich ascites tumor cell을 이식하여 복수암이 유발된 생쥐의 EATC 성장을 살펴 본 결과 약침액을 투여한 생쥐의 EATC의 성장이 크게 억제되었으며, 복수암이 유발된 생쥐의 비장 무게가 대조군에 비해 증가하였다. 또한 장기간의 관찰에 의해서도 복수암 세포의 성장 저해에 의해 생쥐의 체중변화율은 대조군에 비해 크게 억제되었으며 수명 연장 효과가 나타났다. 이와같은 생체에서의 암예방 효과를 in vitro 상에서 그 기전을 살펴본 결과 애엽 약침액은 phase II detoxification 효소인 QR의 생성을 유도하고 GSH 함량을 증가시켜서 암예방 효과를 나타내었다.

• Bulletin of the Korean Chemical Society
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• 제25권9호
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• pp.1366-1370
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• 2004

Controlled pore glass bead was modified with bovine serum albumin (BSA), and glutathione (GSH) was immobilized through three kinds of linkers on top of BSA. Bis(3-sulfo-N-hydroxysuccinimide suberate) sodium salt $(BS^3)$, N-hydroxysuccinimide 3-(2-pyridyldithio)propionate (SPDP), or N-hydroxysuccinimide 4-maleimidobutyrate (GMBS) was introduced into the BSA-bound matrix. Subsequently, GSH was immobilized by addition of thiol side chain into the maleimido moiety, replacing a disulfide group, or formation of an amide group upon releasing 3-sulfo-N-hydroxysuccimide group. It was observed that conjugation methodology played a critical role for activity of the immobilized GSH. SDS-PAGE chromatogram showed that the matrix of glutathione immobilized on BSA through GMBS manifested high selectivity towards glutathione-S-transferase (GST) in cell lysate.

• 한국식품영양과학회지
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• 제22권6호
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• pp.678-684
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• 1993

To evaluate the role of xanthine oxidase in liver damage by CCl4, a group of rats were fed tungstate for a month, which suppressed the activities of xanthine oxidase in serum and liver. Control group of rats were fed standard diet without tungstate. Liver damage was induced both in tungstate fed and control groups by two intraperitoneal injections of CCl4 at the level of 0.1ml/100g body weight at intervals of 24 hours. Increases in the levels of serum alanine aminotransferase by CCl4 were significantly smaller in tungstate fed rats than in control rats. Concomitantly, histopathologic changes were less in tungstate fed rats than in control ones. In rats either treated with CCl4 or not, hepatic type O xanthine oxidase activities were remarkably reduced by tungstate feeding. Hepatic aniline hydroxylase activities were higher in rats fed tungstate than control rats when animals were not treated with CCl4, but the enzyme activities were lower in tungstate fed rats than control when they were treated with CCl4. Neither tungstate feeding nor CCl4 treatment caused any significant changes in hepatic glutathione contents, and activities of hepatic glutathione S-transferase, glutathione peroxidase and superoxide dismutase. It is concluded xanthine oxidase reaction augment CCl4 induced liver damage via oxygen free radical system.

• 약학회지
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• 제42권1호
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• pp.108-113
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• 1998

G009, a polysaccharide isolated from the mycelia of Ganoderma lucidum IYO09, showed a hepatoprotective activity against $CCl_4$ induced cytotoxicity in primary cu ltured rat hepatocytes. Incubation of $CCl_4$-intoxicated hepatocytes with G009 significantly reduced the levels of glutamic pyruvic transaminase and sorbitol dehydrogenase released from hepatocytes in the medium. G009 showed antioxidative effect by elevating the activities of glutathione reductase and superoxide dismutase, and the content of glutathione in $CCl_4$-intoxidcated primary cultured rat hepatocytes. Furthermore, G009 significantly elevated glutathione-S-transferase activity in $CCl_4$-intoxicated primary cultured rat hepatocytes. G009 also reduced the production of malondialdehyde, a byproduct of lipid peroxidation. From these results, it could be concluded that G009 exerted hepatoprotective activity against $CCl_4$-induced cytotoxicity through antioxidation.

• Nutrition Research and Practice
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• 제11권3호
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• pp.214-222
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• 2017

BACKGROUND/OBJECTIVES: Glutathione S-transferase (GST) forms a multigene family of phase II detoxification enzymes which are involved in the detoxification of xenobiotics by conjugating substances with glutathione. The aim of this study is to assess the antioxidative status and the degree of DNA damage in the subclinical hypertensive patients in Korea using glutathione S-transferase polymorphisms. SUBJECTS/METHODS: We examined whether DNA damage and antioxidative status show a difference between GSTM1 or GSTT1 genotype in 227 newly diagnosed, untreated (systolic blood pressure $(BP){\geq}130mmHg$ or diastolic $BP{\geq}85mmHg$) subclinical hypertensive patients and 130 normotensive subjects (systolic BP < 120 mmHg and diastolic BP < 80 mmHg). From the blood of the subjects, the degree of the DNA damage in lymphocyte, the activities of erythrocyte superoxide dismutase, the catalase, and the glutathione peroxidase, the level of glutathione, plasma total radical-trapping antioxidant potential (TRAP), anti-oxidative vitamins, as well as plasma lipid profiles and conjugated diene (CD) were analyzed. RESULTS: Of the 227 subjects studied, 68.3% were GSTM1 null genotype and 66.5% were GSTT1 null genotype. GSTM1 null genotype had an increased risk of hypertension (OR: 2.104, CI: 1.38-3.35), but no significant association in GSTT1 null genotype (OR 0.982, CI: 0.62-1.55). No difference in erythrocyte activities of superoxide dismutase, catalase, or glutathione peroxidase, and plasma TRAP, CD, lipid profiles, and GSH levels were observed between GSTM1 or GSTT1 genotype. Plasma levels of ${\alpha}-tocopherol$ increased significantly in GSTT1 wild genotype (P < 0.05); however, plasma level of ${\beta}-carotene$ increased significantly in GSTT1 null genotype (P < 0.01). DNA damage assessed by the Comet assay was significantly higher in GSTM1 null genotype than wild genotype (P < 0.05). CONCLUSIONS: These results confirm the association between GSTM1 null genotype and risk of hypertension as they suggest that GSTM1 null genotype leads to an increased oxidative stress compared with wild genotype.

• 대한한의학회지
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• 제25권4호
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• pp.36-42
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• 2004

Objective : Glutathione S-transferase polymorphism (GST) were examined in 120 cases with ischemic cerebrovascular disease (ICVD) to test the hyperthesis that GST polymorphisms confer a risk to an individual to develop ICVD. Tobacco smoking is a major cause of both cancer and vascular disease. Methods : therefore We were stratified the subjects with ICVD for smoking status, and then examined whether polymorphisms in this detoxification enzyme gene, GST, influence risk of ICVD Results : Neither GSTM1 nor GSTT1 genotypes in the ICVD group was significantly different from the control group (n=207), even in smokers. We attempted the combined analyses for GSTM1 and GSTT1 genotypes in ICVD for smoking status. No significant association observed between the combined genotypes and ICVD Conclusion : Our observation do not confirm the effect of the GSTM1 and GSTT1 genotypes as a risk factor for ICVD, even in smokers.

• Bulletin of the Korean Chemical Society
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• 제24권8호
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• pp.1188-1192
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• 2003

In order to study the role of residue in the active site of glutathione S-transferase (GST), Tyr 108 residue in human GST P1-1 was replaced with alanine, phenylalanine and tryptophan by site-directed mutagenesis to obtain mutants Y108A, Y108F and Y108W. These three mutant enzymes were expressed in Escherichia coli and purified to electrophoretic homogeneity by affinity chromatography on immobilized GSH. The substitutions of Tyr108 significantly affected $K_m^{CDNB}$ and $K_m^{ETA}$, whereas scarcely affected $K_m^{GSH}$. The substitutions of Tyr108 also significantly affected $I_{50}$ of ETA, an electrophilic substrate-like compound. The effect of these substitutions on kinetic parameters and the response to inhibition suggests that tyrosine 108 in hGST P1-1 contributes to the binding of the electrophilic substrate and a major determinant in the binding of CDNB is the aromatic ring of Tyr108, not its hydroxyl group.