• Journal of the East Asian Society of Dietary Life
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• v.5 no.3
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• pp.385-394
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• 1995

Our previous reports on the effect of dietary protein on methanethiol, ethacrynic acid, bromobenzene and carbon tetrachloride metabolism were overall reviewed. The methanethiol, ethacrynicacid and bromobenzene treated rats showed the more severe liver damage in those fed a low protein diet than those fed a standard protein diet. These xenobiotics treated rats showed the lower content of hepatic glutathione and its conjugated enzyme, glutathione S-transferase activities in those fed a low protein diet than those fed a standard protein diet. In case of carbon tetrachloride treated rats, the liver damage was more reduced in rats fed a low protein diet than those fed a standard protein diet. Concomitantly the hepatic cytochrome P-450 content, and its decreasing rate to the control were lower in rats fed a low protein diet than those fed a standard protein diet.

• Toxicological Research
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• v.9 no.2
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• pp.159-166
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• 1993

The treatmene of V79 cells with diethyl maleate (DEM) led to decrease in glutathione (GSH) level as increasing DEM concentration. Mercuric chloride, treated for 6 hrs with 2ng/ml, affected the GSH metabolizing enzymes glutathione S-transferase (GST) and glutathione peroxidase (GSP), dropping their activities to 60% and 75%, respectively, though not so much in GSH level(80%). However, the toxic effects of mercuric chloride on those enzymes and GSH level were both amplified when the Hg2+ treatment was combined with the preceding DEM treatment.

• BMB Reports
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• v.31 no.4
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• pp.399-404
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• 1998

In order to gain further insight on the relationship between structure and function of glutathione S-transferase (GST), the six active-site mutants, R13T, K44T, Q51A, Q64A, S65A, and D98A, of human GST P1-1 were expressed in Escherichia coli and purified to electrophoretic homogeneity by affinity chromatography on immobilized GSH. The active-site mutants showed marked differences in substrate specificity. The substitution of Gln51 with threonine resulted in a drastic decrease in the specific activities to <10% of the wild-type value. The substitution of Arg13 with threonine resulted in more decreased specific activity toward cumene hydroperoxide and in the $I_{50}$ values of S-(2,4-dinitrophenyl) glutathione and benanstatin A. These results suggest that the substitution of Arg13 with threonine changes the conformation of the active site to increase the affinity for the product or electrophilic substrate. Lys44 seems to be in the vicinity of the H-site of hGST P1-1 or may contribute to some extents to the electrophile binding.

• BMB Reports
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• v.55 no.3
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• pp.154-159
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• 2022

Protein S-glutathionylation is a reversible post-translational modification on cysteine residues forming a mixed disulfide with glutathione. S-glutathionylation, not only protects proteins from oxidation but also regulates the functions of proteins involved in various cellular signaling pathways. In this study, we developed a method for the detection of S-glutathionylated proteins (ProSSG) using eosin-glutathione (E-GSH) and mouse glutaredoxin 1 (mGrx1). ProSSG was efficiently and specifically labeled with E-GSH to form ProSSG-E via thiol-disulfide exchange. ProSSG-E was readily luminescent allowing the detection of ProSSG with semi-quantitative determination. In addition, a deglutathionylation enzyme mGrx1 specifically released E-GSH from ProSSG-E, which increased fluorescence allowing a sensitive determination of ProSSG levels. Application of the method to the adipocyte differentiation of 3T3-L1 cells showed specific detection of ProSSG and its increase upon differentiation induction, which was consistent with the result obtained by conventional immunoblot analysis, but with greater specificity and sensitivity.

• Archives of Pharmacal Research
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• v.21 no.6
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• pp.790-792
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• 1998

• Bulletin of the Korean Chemical Society
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• v.32 no.10
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• pp.3756-3759
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• 2011

• Toxicological Research
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• v.11 no.2
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• pp.253-259
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• 1995

To investigate an effect of ethanol pretreatment on the bromobenzene metabolism, the brornobenzene (400 mg/kg body wt. i. p.) was given 3 times at intervals of one day to the male rats orally pretreated with 5% ethanol throughout 2 months. In the ethanol pretreated rats, liver injuries were not demonstrated on the basis of the liver weight per body weight, serum levels of alanine aminotransferase (ALT) activity and histopathologic findings. By the bromobenzene treatment, ethanol pretreated rats showed the more decreased levels of serum ALT and liver weight/body weight(%), and decreased degree of liver damage on histopathological observation than the control group. The ethanol pretreated rats showed the more increased activities of hepatic aniline hydroxylase, glutathione Stransf erase (GST) and the more decreased contents of glutathione than the control. Concomitantly the ethanol pretreated rats showed the more decreased contents of hepatic glutathione and increased activities of GST by the bromobenzene treatment. Above results indicate that ethanol pretreatment enhance the metabolizing ability of bromobenzene in rats.

• Herbal Formula Science
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• v.10 no.2
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• pp.85-95
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• 2002

Objectives: In traditional medicine, Wolgukwhan has been used for the treatment of digestive system disease, such as indigestion, brash, ructation, nausea and vomiting. This study was purposed to investigate the effects of Wolgukwhan methnol extract (WGWM) on oxidative liver cell injury. Methods: In vivo assay, we administerated acetaminophen(500mg/kg, i.p.) to starved mice 24hrs after pretreatment of WGWM for 6days. In the liver homogenates, lipid peroxide and glutathione(GSH) levels were measured. In addition, activities of hepatic enzyme, such as catalase, glutathione peroxidase(GPX), glutathione S-transferase(GST) were measured in the hepatic mitochondrial and cytosolic fractions. Results: In vivo administeration of WGWM showed effective inhibition of acetaminophen induced lipid peroxidation and elevations of glutathione level. The acetaminophen treatment resulted in a decrease of catalase, GPX and GST activities. By contrast, WGWM pretreatment increased compare to those of untreated groups. Conclusions: These results suggested that WGWM might protect against lipid peroxidation by free radicals, destruction of hepatic cell membranes.

• Journal of Acupuncture Research
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• v.17 no.1
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• pp.129-142
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• 2000

Gamdutang aqua-acupuncture solution(GAS), Gamdutang water-extracted solution(GWS) and Degamdutang aqua-acupuncture solution(DGAS) were prepared and tested for potential antitumor activities. It was used three biomarkers (quinone reductase, omithine decarboxylase, glutathione) to test chemopreventive potentials of GAS, GWS, DGAS. GAS was potent inducer of quinone reductase activity in Hepalclc7 murine hepatoma cells in culture, whereas GWS is less potent. GAS, GWS and DGAS were significantly induced quinone reductase activity in cultured rat normal liver cell, Ac2F. Glutathione levels were increased about 1.8-fold with GAS, 1.0-1.1 fold with GWS, DGAS in cultured murine hepatoma hepaiclc7 cells. In addition glutathione s-transferase levels were increased with GAS, GWS and DGAS. The effects of GAS, GWS and DGAS were tested on the growth of Acanthamoeba castellanii. Proliferation of Acanthamoeba castellanii was inhibited by GAS, GWS and DGAS at concentradons of $1{\times}$ and $5{\times}$. These results suggest that GAS has chemopreventive potential by inducing quinone reductase and quinone reductase activities, inhibition of ornithine decarboxylase activity, and increasing glutathione levels.

• The Journal of Internal Korean Medicine
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• v.21 no.3
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• pp.399-407
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• 2000

This study was carried out to examine if Haejohwan (HJ) inhibits oxidant-induced lipid peroxidation and therby produces protective effect against thyroxine-induced hyperthyroid rats. Triiodothyronine $(T_3)$, thyroxine $(T_4)$, lipid peroxidation, xathine oxidase activities and type conversion ratio were increased in thyroxine treated group. However, they were decreased in HJ extract's pre-applied group. Glutathione level, activities of glutathione peroxidase, glutathione Stransferase and glutathione reductase were decreased in thyroxine treated group. But, they were increased in HJ extract's pre-applied group. These results suggest that in thyroxine-induced hyperthyroid rats HJhas an increase in the activities of oxygen free radical scavenging enzymes and inhibition of xanthine oxidase activities, and prevents lipid peroxidation.