• Journal of Nutrition and Health
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• 제23권1호
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• pp.11-18
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• 1990

Sprague-dawley 숫쥐를 식이지방을 달리하여(I:Soybean oil p/s 4.0, II:beef tallow p/s 0.08) 이유후 8주동안 사육하였다. 이때 I,II군은 각각 기초식이군, 기초식이군에 0.3% butylated hydroxytoluene(BHT)를 첨가신킨 군, 생후 5~7주 사이에 4번의 2-Acetylaminofluorene(2-AAF)를 투여한 군 2-AAF를 투여하고 BHT도 먹인 군으로 나누었다. BHT는 이유 후부터 식이에 섞어 먹였으며 2-AAF를 투여하지 않은 군읜 2-AAF 주사에 의해 얻는 stress와 같은 효과를 주기위해 placebo로 polyethylene glycol 300을 투여하였다. Mixed function oxidase(MFO)계의 효소인 cytochrome p-450, cytochrome b$_5$및 cytochrome p-450 reductase와 과산화지질 등을 측정하였다. 성장기에 2-AAF의 투여는 성장지연을 초래하였으며 지질과산화물은 지방의종류, 2-AAF,BHT 등에 의해 큰 차는 없었다. Cytochrome p-450은 2-AAF에 의해 I-BHT-AAF와 II-AAF군에서 증가되었고 BHT에 의해서는 차이가 나지 않았다. 불포화지방을 먹인경우 cytochrome p-450과 cytochrome p-450 reductase가 2-AAF에 의해 증가되기보다는 오히려 감소하거나 I,II군에 비해 별 차이가 없었는데 2-AAF의 농도와 식이의 불포화도가 높아 세포막이 손상되었기 때문이라 사료된다. Cytochrome $b_5$는 각군 사이에 별 차가 없었다. Cytochrome p-450과 과산화지질(r=0.2475, p<0.05), cytochrome p-450 reductase와 cytochrome $b_5$ (r=0.2475, P<0.05)가 각각 양의 상관관계를 나타내었다. 따라서 2-AAF를 대사시키는 MFO계는 식이지방의 종류 및 BHT의 존재에 따라 영향을 받고, 특히 불포화지방식이인 경우 2-AAF를 대사시킬 수 있는 cytochrome p-450 유도 및 합성능력이 매우 저조함을 알 수 있으며 2-AAF는 어린 쥐의 성장을 지연시켰다.

• 생약학회지
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• 제21권1호
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• pp.74-82
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• 1990

The effects of naturally occurring furanocoumarins on cytochrome P-450 have been investigated in rat liver microsomes. Incubation of microsomes with an NADPH-generating system and four furanocoumarins such as imperatorin, isoimperatorin, phellopterin and byakangelicin at $37^{\circ}$ in vitro resulted in a significant destruction of cytochrome P-450. A single treatment(50 mg/kg, i.p.) of rats with each furanocoumarin caused a rapid loss of cytochrome P-450 accompanied by the loss of heme from the microsomes but not by the loss of cytochrome $b_5$. It is suggested that cytochrome P-450 is specifically destroyed by furanocoumarins in a metabolic process involving destruction of its heme group and as a consequence, hepatic enzyme activities are depressed markedly.

• Applied Biological Chemistry
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• 제38권2호
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• pp.168-173
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• 1995

Endosulfan이 흰쥐(Balb/c.) 체내의 cytochrome P-450 효소계에 미치는 영향을 조사하기 위해 endosulfan을 7.5 mg/kg 수준으로 복강주사하였다. Endosulfan을 복강주사 처리하여 48시간 후 적출한 흰쥐의 간에서는 cytochrome P-450 함량이 $3.3{\sim}4.2$배, cytochrome $b_5$ 함량이 $2.3{\sim}3.8$배, NADPH cytochrome P-450 reductase 활성이 $5.3{\sim}6.4$배 그리고 총 haem 함량이 $3.1{\sim}3.6$배씩 대조구의 그것들에 비해 증가하였다. Endosulfan은 대조구 흰쥐 간의 cytochrome P-450 효소계와 상호작용하여 파장 387와 389 nm에서 흡광도의 증가를 보였으며 파장 407 nm에서 넓은 흡수대를 형성하였다. 환원형 P-450-CO spectrum은 대조구의 경우 파장 451 nm에서 흡광도의 극대를 보인 반면 endosulfan으로 처리된 흰쥐 간의 그것은 파장 449와 450 nm에서 흡광도의 극대를 보였다. Endosulfan 처리로 흰쥐 간과 신장의 aldrin epoxidase 활성이 각각 2.8배와 2.1배씩 증가하였으며 7-ethoxyresorufin dealkylase 활성은 각각 1.7배와 1.8배씩 증가하였다.

• 한국식품영양과학회지
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• 제28권3호
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• pp.638-645
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• 1999

This study was done to investigate effects of ${\gamma}$ irradiated beef feeding on the formation of gluta thione S transferase placental form positive(GST P+) foci, lipid peroxidation, cytochrome P450 system and microsomal glucose 6 phosphate activity in diethylnitrosamine(DEN) initiated rat hepatocarci nogenesis. Weaning Sprague Dawley male rats were fed the diet containing ${\gamma}$ irradiatied ground beef at the dose of 0, 3, 5kGy as a 20% of protein source for 8 weeks. One week after feeding, rats were intraperitoneally injected twice with a dose of DEN(50mg/kg BW). As a promoter, 0.05% phenobarbital was fed in drinking water from one week after DEN treatment until the end of experiment. At the end of 8th week, rats were sacrificed and hepatic GST P+ foci, microsomal malondialdehyde(MDA) and conjugated diene contents were determined. In addition, cytochrome P450 content and the activities of NADPH cytochrome P450 reductase and glucose 6 phosphatase were also measured. There was no significant effect by gamma irradiation on microsomal MDA content, conjugated diene, cytochrome P450 content and activities of NADPH cytochrome P450 reductase and glucose 6 phosphatase. However with DEN treatment, microsomal MDA content and conjugated diene contents were significantly changed. Cytochrome P450 content was also significantly increased while microsomal glucose 6 phophatase activity was significantly decreased with DEN treatment. However activity of NADPH cytochrome P450 reductase was not affected. An interesting finding in this study was that the number and area of hepatic GST P+ foci of the rats fed gamma irradiated beef were significantly(p<0.05) lower than those of the control. Such a lowering effect on GST P+ foci formation was highest at the dose of 3kGy than others. Overall results suggest that the consumption of low dose of gamma irradiated beef does not affect the formation of lipid peroxide, cytochrome P450 system and membrane stability.

• 약학회지
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• 제37권1호
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• pp.95-99
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• 1993

Peroxidase activity of cytochrome P-450 was examined using N, N-dimethylaniline (NDA) as a substrate and cumene hydroperoxide (CHP) as an oxidant. The initial rates of the N-demethylation for varied concentrations of NDA (0.05-0.5 mM) by P-450 at different fixed concentrations of CHP (0.02-0.2 mM) were determined. The results suggest that P-450 proceeds its peroxidative reaction by the rapid equilibrium random bi bi mechanism to form a ternary complex with substrate and oxidant as an active intermediate.

• Korean Journal of Acupuncture
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• 제19권2호
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• pp.57-61
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• 2002

천궁약침액을 7일간 중완혈, 간수혈 및 임의혈에 투여한 후 마우스의 간에서 유도되는 phase I enzyme 억제 효과를 살펴본 결과 천궁 약침액은 CYP 1A1를 저해하였고, 생체의 CYP 2E1의 활성도 억제하였으므로 천궁 약침액은 암예방 효과가 있을 것으로 사료된다.

• 사상체질의학회지
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• 제17권2호
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• pp.64-73
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• 2005

1. Objectives The purpose of this study was to investigate the effects of the enzyme activity of Palmulgunja-tang with administered orally solution on cytochrome P450 isozyme 2. Methods This study was carried on through following methods. We treated the rat with the {3-naphthoflavone (${\beta}NF$) of 80mg/kg for 3 days i.p injection. Firstable, microsomal protein was separated and total intracellular protein test was done. Then GOT and GPT were measured and assay of cytochrome P450 IAI/2 enzyme activity was performed according to the method of EROD and MROD. (Ethoxyresorufin-O-deethylase(EROD) activity was used to measure cytochrome P450 lAI activity and methoxyresorufin O-demethylase(MROD) activity was used to measure cytochrome P450 lA2 activity. ) 3. Results and Conclusions 1) PGT recovered the liver damage on ${\beta}NF$ inducible CYP IAI/2 by pre-post and high-low condition. 2) At concentration of post-treated 50mg!kg of PGT, the inhibiting of $\betaNF$ metabolites to liver of rat cytochrome P450 lAl was inhibited by 53.0% respectively. 3) PGT showed 36.0% inhibition of ${\beta}NF$-induced lA2 activity at the concentration post-treated 50mg/kg.

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 1993년도 제2회 신약개발 연구발표회 초록집
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• pp.100-100
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• 1993

Antiestrogen은 에스트로젠 의존성 유방암 치료에 사용되는 약물로써 표적 세포 내에서 에스트로젠 수용체와 작용하여 세포 증식 억제 작용을 나타내고 동시에 에스트로젠 수용체와는 구분되는 소포체 분획의 antiestrogen specific binding site (AEBS) 와도 결합을 하는 것으로 알려져 있다. 그러나, 아직 이 AEBS의 생리적 또는 약리적 기능은 밝혀져 있지 않다. 따라서 본 실험에서는 AEBS의 기능을 조사하기 위하여 cytochrome P45O III 효소군과 AEBS와의 관계를 자옹 백서를 이용하여 면역 화학 반응 실험 및 경쟁적 결합 반응 실험을 하였고, 그 결과는 다음과 같다. 1) AEBS에 대해서 SKF-525A와 metyrapone은 결합 능력을 나타내었다. 2) 자성쥐에서는 주령이 증가함에 따라 cytochrome P450양이 감소하였다. 3) 자옹성쥐 모두에서 phenobarbital 처치에 의해 cytochrome P450 III 효소양이 증가하였고, AEBS도 증가하였다. 4) 웅성쥐에서는 testosterone에 의하여 AEBS가 증가하였다. 5) 자웅성쥐 모두에 tamoxifen 관류시 cytochrome P450 III 효소양이 증가하였고 estradiol과 병용 관류시에는 tamonifen 단독 관류시보다 감소하였다. 이상의 결과에서 tamoxifen이 cytochrome P450 III을 유도할 수 있는 것으로 사료되며 cytochrome P450 III 효소군과 안티에스트로젠 결합부위와 밀접한 관련이 있는 것으로 생각된다.

• BMB Reports
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• 제30권1호
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• pp.73-79
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• 1997

This study was designed to investigate the effects of dietary garlic powder on cytochrome P450 enzymes and membrane stability in murine hepatocarcinogenesis initiated by diethylnitrosamine (DEN). Male Sprague-Dawley rats received a single intraperitoneal injection of DEN (200 mg/kg body wt) dissolved in saline. After 2 weeks on a basal diet, animals were fed diets containing 0. 0.5. 2.0. or 5.0% garlic powder for 6 weeks, and were subjected to two-thirds partial hepatectomy. The areas of placental glutathione S-transferase (GST-P) positive foci were inhibited in rats fed with garlic diets. GST-P is the most effective marker for DEN-initiated lesions. Hepatic microsomal lipid peroxidation was significantly decreased in rats fed with 2.0 and 5.0% garlic powder diets compared with that observed in the control animals and hepatic microsomal glucose 6-phosphatase (G6Pase) activity was found to increase significantly in rats fed 0.5 and 2.0% garlic powder diets. Thus as little as 0.5% garlic powder has a positive effect on the stability of hepatic microsomal membranes. p-Nitrophenol hydroxylase (PNPH) activity and the level of cytochrome P450 2E1 protein in the hepatic microsomes from rats fed diets containing 2.0 and 5.0% garlic powder were much lower than those of control microsomes. Rats fed 5.0% garlic powder diets exhibited the lowest P450 2E1 activity and protein levels among groups. Pentoxyresorufin O-dealkylase activity and immunoblot (cytochrome P450 2B1) analyses were not different between groups. However, the levels of cytochrome P450 1A1/2 protein in rats fed 0.5 and 2.0% garlic powder were significantly induced compared to controls. These results suggest that 2.0% garlic powder is effective in inhibiting the areas of GST-P positive foci, modulating certain isoforms of cytochrome P450 enzymes and stabilizing the hepatic microsomal membrane. Thus, the selective modification of cytochrome P450 enzymes and membrane stability by dietary garlic powder may influence areas of GST-P positive foci and chemoprevention of post-initiation of rat hepatocarcinogenesis.

• Fisheries and Aquatic Sciences
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• 제5권1호
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• pp.28-31
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• 2002

Effects of cimetidine, a cytochrome P450 inhibitor, on the benzo[a]pyrene (BaP)-mediated cytochrome P450 induction and lipid peroxidation of liver in olive flounder, Paralichthys olivaceus, were investigated. Fish were fed either a cimetidine-supplemented diet or a cimetidine-free control diet once daily to satiation for 3 days. After 6 hrs of last feeding, the fish received intraperitoneal (i.p.) injection of BaP (20 mg/kg of body weight) dissolved in sterile corn oil $(100 \mu L)$ or received only a corn oil i.p. injection. At 1, 2, 3, and 7 days after the injection, hepatic cytochrome P450 and thiobarbituric acid reactive substances (TBARS), an indicator of lipid peroxidation, were analyzed. BaP injection resulted in an increase of hepatic cytochrome P450, and the fish fed the cimetidine-supplemented diet before injection of BaP showed delayed increase of hepatic cytochrome P450 compared to the fish fed a cimetidine-free diet and BaP injected. Injection of BaP clearly induced hepatic lipid peroxidation, and consistently higher TBAR values were shown in the fish fed a cimetidine­supplemented diet before injection of BaP than the fish injected with BaP alone.