• Toxicological Research
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• 제11권2호
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• pp.247-252
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• 1995

To evaluate the effect of xanthine oxidase on liver injury by $CCl_4$, liver damage was induced both in allopurinol pretreated rats (500 mg/kg. ip) and control group by twice intraperitoneal injection of $CCl_4$ (0.1 ml/100 g body wt. 50% in olive oil) at interval of one day. Increases in the levels of serum alanine aminotransferase and liver weight/body weight (%) by $CCl_4$ were significantly smaller inallopurinol pretreated rats than in control whereas the hepatic microsomal glucose-6-pholphatase activities were significantly higher in allopurinol pretreated rats than control group by $CCl_4$ treatment. These results indicates that allopurinol pretreatment may reduce the liver damage in $CCl_4$ intoxicated rats. In rats either with $CCl_4$or not, hepatic type O xanthine oxidase activities were significantly reduced by allopurinol pretreatment and the increasing rate of these enzymes to each control was remarkably lower in allopurinol pretreated rats than control. Liver cytosolic protein contents and aniline hydroxylase, aminopyrine demethylase activities were higher in allopurinol pretreated rats than coirol rats when animals were treated with $CCl_4$. On the other hand, neither allopurinol pretreated nor $CCl_4$ treatment caused any significant changes in hepatic superoxide dismutase and catalase activities. Hepatic glutathione contents were higher in $CCl_4$-treated rats than control, but no significant changes were found in both between the allopurinol treated rats and $CCl_4$-treated rats pretreated with allopurinol, and glutathione and glutathione S-transferase activities were significantly reduced in $CCl_4$-treated rats than control whereas these enzyme activities showed on significant change in both between allopurinel treated and $CCl_4$-treated rats pretreated with allopurinol. It is concluded that xanthine oxidase reaction system augment $CCl_4$ induced liver injury via even oxygen free radical system.

• 한국염색가공학회지
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• 제17권1호
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• pp.52-59
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• 2005

The purpose of this study is to establish the scientific data of cotton fabric pretreated with skim milk powder and to improve the dyeability. The surface monophology, add on, whiteness, stiffness, air permeability, moisture regain and absorption of cotton fabrics were evaluated by varying concentration of SMP to get the optimal conditions in pretreatment. FT-IR of cotton fabrics pretreated with SMP were measured. Amino acid compositions, viscosity of SMP were evaluated. The K/S values by varying concentration of cinnamon cassia and subtract of dyed SMP-C were measured. I attempted to evalute the color fastness of untreated and AI. The results are as follow; The optimal concentration of SMP was 9%(w/v) to be pretreated with cotton fabrics. From FT-IR spectrum, formation of -NH$_2$ and -COOH was verified by SMP-C. Denaturalization of protein and condensation of carbohydrate, fat, etc. were found in a measurement of amino acid and viscocity. The K/S value of cotton fabrics pretreated with SMP was higher than that of untreated. Most of the color fastnesses were great.

• Toxicological Research
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• 제11권2호
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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.

• Journal of Microbiology and Biotechnology
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• 제17권4호
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• pp.650-654
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• 2007

In our previous work, a method of pretreating lipase was developed to prevent loss of its activity during covalent immobilization. In this study, Rhizopus oryzae lipase was pretreated before immobilization and then immobilized on a silica gel surface. The effects of the various materials and conditions used in the pretreatment stage on the activity of immobilized lipase were investigated. Immobilized lipase pretreated with 0.1% of soybean oil had better activity than those pretreated with other materials. The optimal temperature, agitation speed, and pretreating time for lipase pretreatment were determined to be $40^{\circ}C$, 200rpm, and 45min, respectively. The activity of immobilized soybean oil pretreated lipase was 630U/g matrix, which is 20 times higher than that of immobilized non-pretreated lipase. In addition, immobilized lipase activity was maintained at levels exceeding 90% of its original activity after 10 reuses.

• 대한한방내과학회지
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• 제15권1호
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• pp.138-151
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• 1994

These studies were carried out to investigate the effect of Onpaetang water extract on the inhibitory contractile action of acetylcholine in sensitized rat. The results of these studies were as follows; 1. Contractile force of acetylcholine from trachea smooth muscle in sensitized rat was significantly inhibited by Onpaetang. 2. Dose-response of acetylcholine pretreated Onpaetang in sensitized rat was not significantly changed. 3. Inhibitory contractile action of acetylcholine pretreated propranolol in sensitized rat was decreased. 4. Inhibitory contractile action of acetylcholine pretreated indomethacin was not significantly changed by Onpaetang. 5. Inhibitory contractile action of acetylcholine pretreated methylene blue was not significantly changed by Onpaetang. 6. Inhibitory contractile action of acetylcholine pretreated tetrodotoxin was not significantly changed by Onpaetang.

• 대한한방내과학회지
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• 제15권2호
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• pp.240-248
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• 1994

These studies were carried out to investigate the effects of Macmundongtang extract on the inhibitory contractile action of acetylcholine in control rat. The results of these studies were as follows: 1. Contractile force of acetylcholine from tracheal smooth muscle in control rat was significantly inhibited by Macmundongtang. 2. Inhibition contractile action of acetylcholine pretreated ACH $ED_{50}$ in control rat was significantly changed. 3. Dose-response of acetylcholine pretreated Macmundongtang in control rat was not significant. 4. Inhibitory contractile action of acetylcholine pretreated propranolol in control rat was not significantly changed by Macmundongtang. 5. Inhibitory contractile action of acetylcholine pretreated methylene blue in control rat was significantly changed. 6. Contractile force of acetylcholine pretreated indomethacin from trachea smooth muscle in control rat was not significantly inhibited by Macmundongtang.

• 약학회지
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• 제46권4호
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• pp.265-269
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• 2002

The purpose of this study was to report the pharmacokinetic changes of cyclosporine after oral administration of cyclosporine, 10 mg/kg, in rabbits coadministered or pretreated twice per day for 3 days with nimodipine, dose of 5 mg/kg. The area under the plasma concentration-time curve (AUC) of cyclosporine was significantly higher in rabbits pretreated with nimodipine than that in control rabbits (p＜0.01), showing about 149％ increased relative bioavailability. The peak plasma concentration (C$_{max}$), elimination half-life (t$_{1}$2/) and MRT of cyclosporine were increased significantly (p＜0.05) in rabbits pretreated with nimodipine compared with those in control rabbits. This findings could be due to significant reduction of elimination rate constant and total body clearance by pretreated with nimodipine. The effects of nimodipine on the pharmacokinetics of oral cyclosporine were more considerable in rabbits pretreated with nimodipine compared with those in control rabbits. The results suggest that the dosage of cyclosporine should be adjusted when the drug would be coadministered chronically with nimodipine in a clinical situation.n.

• 약학회지
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• 제35권5호
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• pp.379-383
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• 1991

This study was attempted to investgate the pharmacokinetics of theophylline (4 mg/kg i.v) in the rabbits pretreated with propranolol (1 and 2.5 mg/kg/hr, infusion) for four hours. The plasma concentration and AUC of theophylline were increased in rabbits pretreated with propranolol as compared with those of normal rabbits. The amount of cumulative urinary excretion and renal clearance and total body clearance were decreased in rabbits pretreated with propranolol as compared with those of normal rabbits. The apparent volume of distribution was slightly affected by change of the clearance of theophylline. From the results of this experiment, it is desirable that dosage regimen of theophylline should be adjusted when theophylline combined with propranolol in clinical pharmacy practice.

• 대한약리학회지
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• 제10권2호
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• pp.55-62
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• 1974

This study was undertaken to determine if the adrenocortical hormone was concerned on erythropoietic function, especially on the production of erythropoietin in the kidney. Erythropoietin titers in plasma measured in each group of mice: 1) hypertransfused mice treated with the plasma of rats pretreated with hydrocortisone, dexamethasone, fludrocortisone and DOCA 2) hypertransfused mice treated with the plasma of the rat pretreated with aldosterone antagonist and adrenocortical hormone concomitantly. Erythropoietin level in plasma were measured by the modification of DeGowin's method. The results of the experiment were summerised as follows: 1) No significant changes of erythropoietin titers were observed in hypertransfused mice treated with the plasma of rats pretreated with hyrocortisone and dexamethasone respectively. 2) Erythropoietin titers increased significantly in hypertransfused mice treated with the plasma of rats pretreated with fludrocortisone and DOCA respectively, compared with control. 3) No significant changes of erythropoietin titers were observed in hypertransfused mice treated with the plasma of rats pretreated with spironolactone and triamterene respectively, compared with control. 4) Erythropoietin titers slightly increased in hypertransfused mice treated with the plasma of rats pretreated with spironolactone or triamterene, and fludrocortisone concomitantly and also with spirolactone or triamterene and DOCA.

• 한국환경보건학회지
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• 제29권2호
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• pp.23-28
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• 2003

To evaluate the effect of cyclohexane(CH) treatment on the liver cytochrome P-450 dependent aniline hydroxylase(CYPdAH) activity in alcohol-pretreated animals, CH(1.56 g/kg body weight) was intraperitoneally administered to Sprague-Dawley male rats, which had been drunk 15％ alcohol in distilled water for 1,3 and 6 weeks. CH was injected to rats 4 times every other day and the animals were sacrificed at 24 hours after injection of CH. In the alcohol-pretreated rats, liver injuries were not demonstrated on the basis of the liver weight per body weight, the levels of serum alanine aminotransferase and hepatic microsomal glucose-6-phosphatase activities. By the CH treatment, alcohol-pretreated animals showed the significantly increased activity of hepatic microsomal CYPdAH. Concomitantly $V_{max}$ value in CYPdAH was more increased, whereas $K_{M}$ value more decreased in alcohol-pretreated animals by the treatment of CH. In conclusion, the increasing cause of microsomal CYPdAH in CH-treated rats pretreated with alcohol may be due to induction of enzyme protein in rat liver.r.r.