The influences of dietary supplement of citron tea on the hepatocellular chemical carcinogenesis have been studied by examining placental glutathione S-transferase(GST-P) positive foci area in a liver tissue, contents of total cytochrome P450, thiobarbituric acid reactive substances(TBARS) and glucose 6-phosphatase(G6Pase) in hepatic microsome and glutathione S-transferase(GST) activity. Weaning Sprague-Dawley male rats were fed AIN76 diet with or without citron tea supplement. Rats of CTR and CTR+ groups were fed diet without citron tea supplement while CDI and CDI+ groups were fed diet with citron tea supplement for the entire experimental period(13 weeks). Rats of CDP and CDP+ groups were fed diet without citron tea supplement for the first 7 weeks and swiched to citron tea containing diet for the last 6 weeks of experimental period. CTR+, CDI+ and CDP+ groups were carcinogen treated group. Diethylnitrosamine(DEN) was used as a carcinogen initiator and injected to the rats of carcinogen treated groups as a single dose of 200 mg/kg body weight intraperitoneally after 4 weeks of feeding. 2-Acethylaminofiuorene(AAF) was used as a carcinogen promoter and supplied in the diets of carcinogen treated rats as 0.02% content for the last 6 weeks starting from 2 weeks after DEN injection. Rats were sacrificed after 13 weeks of feeding. Liver/body weight ratio and GST activities were increased by carcinogen treatment. However, they were not changed by citron tea supplement. Total cytochrome P450 contents were not changed by carcinogen treatment or citron tea supplement. TBARS contents of carcinogen treated rats showed tendency to decrease by citron tea supplement. G6Pase activity decreased by carcinogen treatment and citron tea supplement. The area of GST-P positive foci detected in carcinogen treated rats were decreased by citron tea supplement and not affected by the timing and the duration of citron tea supplement. These results suggest that citron tea has suppressive effects on hepatocellular chemical carcinogenesis probably through antioxidant compounds by decreasing TBARS contents.
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.
Seo, Jeong-Min;Park, Kyung-Ae;Yeo, Eui-Zu;Choi, Hay-Mie
BMB Reports
/
제32권3호
/
pp.259-265
/
1999
This study was designed to examine the anticarcinogenic effect of dietary supplementation with garlic powder on rat hepatocarcinogenesis. All rats were initiated by a single dose (200 mg/body weight) intraperitoneal injection of diethylnitrosamine (DEN), and three weeks later, subjected to two-thirds partial hepatectomy. Two weeks after initiation, four groups of rats were given experimental diets supplemented with 0 (control group), 0.5, 2.0, or 5.0% garlic powder for 6 weeks. Rats were sacrificed at eight weeks after initiation. The induction of placental glutathione S-transferase (GST-P) positive foci was significantly inhibited almost equally in all three groups fed garlic diets. Glucose 6-phosphatase (G6Pase) activity was increased in rats fed 0.5% and 2.0% garlic powder, and was negatively correlated with the number and area of GST-P positive foci. Thiobarbituric acid reactive substance (TBARS) contents were decreased in rats fed 2.0% and 5.0% garlic powder. Only 5.0% garlic powder supplementation significantly increased the glutathione content and the glutathione S-transferase activity, compared to the control group. Therefore, all levels of garlic powder, 0.5% to 5.0%, exerted an anti promotional effect during hepatocarcinogenesis. Dietary supplementation with garlic powder seemed to maintain microsomal membrane integrity by increasing G6Pase activities. Glutathione-dependent detoxifying enzymes did not seem to contribute to this protective effect directly. The present study suggests that garlic powder is effective in inhibiting the induction of GST-P positive foci, possibly by stabilizing the hepatic microsomal membrane.
This study was done to investigate effects of n-s fatty acids and vitamin E supplement on the preneoplastic hepatic enzyme altered foci and cholesterol metabolism in experimental hepatocarcinogenesis system. Weaning male Sprague-Dawley rats were fed the diet containing either 15% corn oil(CO) or sardine oil(SO) with or without vitamin E 800IU supplementation for 12 weeks. After two weeks of feeding, rats were intraper-itoneally injected with a single dose of diethylnitrosamine(DEN:200mg/kg, BW). At the 4th week, rats were given the diet containing 0.02% acetylaminofluorene(AAF) for next 4 weeks. At the 6th Week, 0.05% pheno-barbital was incorporated into diet for 6 weeks. At the end of 12th week, rats were sacrificed and hepatic glutathions S-transferase placental form positive(GST_{TEX}$P^{+}${/TEX}) foci and serum and liver cholesterol levels were determined. GST_{TEX}$P^{+}${/TEX} formation was significantly decreased by SO feeding when compared with Co feeding but it tended to be enhanced by vitamin E supplementation. Histopathological changes were similar to patterns of GST_{TEX}$P^{+}${/TEX} formation in almost all dietary groups. Serum and hepatic cholesterol levels of SO fed groups were significantly lower than those of CO fed groups. Carcinogen treatments significantly increased serum and liver cholesterol levels in CO fed groups but not in SO fed groups. Correlation data showed a positive correlation(${\gamma}$=0.83, p<0.01) between serum cholesterol level GST_{TEX}$P^{+}${/TEX} foci area. These results indicate that sardine oil as a m-3 fatty acid source may have a reducing effect in rat hepatocarcinogenesis by the altheration of cholesterol metabolism.
To study the effect of dietary $\omega 6/\omega 3$ fatty acid ratios on the preneoplastic lesions and lipid peroxidation in rat hepatocellular chemical carcinogenesis, placental glutathione S-transferase(GST-P) positive foci area and numbers, glucose 6-phosphatase(G6Pase) activity, thiobarbituric acid reactive substances (TBARS) were measured. Male Sprague-Dawley rats were fed 5 different diets-low $\omega 6/\omega 3$ ratio with fish oil (Low-F), low $\omega 6/\omega 3$ ratio with perilia oil(Low-P), moderate ratio with perilia oil(Moderate), blend of 10 different commercial fats and oils(High-BL) and high $\omega 6/\omega 3$ ratio(High)-for 8 weeks. Hepatocarcinogenesis was induced by modified Ito model. The area of GST-P positive loci was the lowest in Moderate group and in ascending order of Low-F < Low-P < High-BL < High. But statistically, only Moderate and High groups were significantly different. The number of GST-P positive foci showed the same trend as foci area. The activities of G6Pase, membrane stability marker, were increased as $\omega 6/\omega 3$ ratio decreased. Lipid peroxidation values (TBARS) were the lowest in Low-F group and it is significantly different from Moderate, High-BL and High groups. When dietary $\omega 6/\omega 3$ ratio was moderate(4.06), hepatocarcinogenesis was suppressed compared with high or low $\omega 6/\omega 3$ ratios. Blend fat, commonly consumed among Koreans, did not show any suppressive effect on carcinogenesis because of high ratio(6.7). These results suggest that dietary $\omega 6/\omega 3$ ratio influences hepatocellular chemical carcinogenesis. It is recommended that appropriate $\omega 6/\omega 3$ ratio should be around 4.0. and we recommend to use more $\omega 3$ fatty acid in food preparation to reduce the risk of hepatocarcinogenesis.
This study is conducted to determine the effects of dietary source of $\omega$3 fatty acids on preneoplastic foci and the glutathione dependent enzymes in rat hepatocarcinogenesis initiated by diethylnitrosamine (DEN). Male Sprague-Dawley rats were fed one of three diets containing 10% (w/w) fats fixed p/s = -1.0 and $\omega$6/$\omega$3 ratio = -0.4 or 4.0 ; fish oil-com oil blended (FC), com oil-beef tallow-fish oil blended (CF), com oil-beef tallow-perilla oil blended (CP), from gestation period. At 10 weeks, animals of experimental groups were injected intraperitoneally with DEN (200 mg/kg body weight) and two-thirds partial hepatectomy was carried out 3 weeks later and were sacrificed 8 weeks after DEN initiation. The area and number of glutathione S-transferase placenta (GST-P) positive foci were significantly decreased in rats fed diets containing fish oil (FC and CF) than those fed perilla oil diet (CP). Fish oil feeding significantly increased the activities of glutathione dependent enzymes. Rats fed diets containing fish oil (FC and CF) significantly increased the glutathione (GSH) content and the activities of glutathione peroxidase (GPx), glutathione reductase (GR), and glutathione S-transferase (GST). Glutathione dependent enzymes had significantly negative correlation with GST-P positive foci. Glucose 6-phosphatase (G6Pase) was increased in rats feeding fish oil. Thiobarbituric acid reactive substances were not different among groups. Therefore, the preventive effect against hepatocarcinogenesis might be explained by induction of the glutathione dependent enzymes and G6Pase. (Korean J Nutrition 36(8): 785∼792, 2003)
Pinocembrin (5, 7-dihydroxyflavanone) is a flavanone extracted from the rhizome of Boesenbergia pandurata. Our previous studies demonstrated that pinocembrin had no toxicity or mutagenicity in rats. We here evaluated its effects on the initiation and promotion stages in diethylnitrosamine-induced rat hepatocarcinogenesis, using short- and medium-term carcinogenicity tests. Micronucleated hepatocytes and liver glutathione-S-transferase placental form foci were used as end point markers. Pinocembrin was neither mutagenic nor carcinogenic in rat liver, and neither inhibited nor prevented micronucleus formation as well as GST-P positive foci formation induced by diethylnitrosamine. Interestingly, pinocembrin slightly increased the number of GST-P positive foci when given prior to diethylnitrosamine injection.
This study is conducted to determine the effects of dietary levels of corn and tuna oils on the formation of preneoplastic lesions in die-thylnitrosamine (DEN) induced rat hepatocarcinogenesis. Weanling male Sprague-Dawley rats were fed 2.5, 5, 15, 25% (w/w) corn or tuna oils. Hepatocellular carcinogenesis was induced by DEN (200 mg/kg body weight) and two-thirds partial hepactectomy was carried out 3 weeks later and were sacrificed 8 weeks after DEN initiation. Tuna oil group showed smaller area of placental glutathione S-transferase (GST-P) positive foci than com oil group. Com oil group of 25% (w/w) showed the widest area of GST -P positive foci, and tuna oil group showed significantly smaller area of GST-P positive foci than com oil in 25% (w/w) level but had no differences between oil levels. Thio-barbituric acid reactive substances (TBARS) content was the highest in 25% (w/w) level of tuna oil group fed long chain and highly polyunsaturated fatty acids. Also serum ${\gamma}$ -glutamyltranspeptidase (GGT) activities in 25% level of tuna oil group were significantly higher than by other levels. As oil contents increased, glucose 6-phosphatase (G6Pase) seems to decrease in com oil groups but remained the same in tuna oil groups. Glutathione reductase (GR) activities were significantly higher in tuna oil group, and the higher the level of tuna oil, the higher GR activities. But Cu/Zn superoxide dismutase (SOD) and glutathione peroxidase (GPx) activities didn't seem to be influenced by levels and kind of dietary fats. Therefore, as oil levels increased, com oil rich in n-6 fatty acids promoted carcinogenesis but tuna oil rich in eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) of n-3 fatty acids suppressed. Although lipid peroxidation products were elevated in 25% (w/w) tuna oil group, GST-P positive foci didn't increase. Therefore pre-neoplastic lesions might be reduced through mediation of a lipid peroxidation process in tuna oil. As fat contents of tuna oil increased, elevated GR activities may give a rise to produce more reduced glutathione in order to protect against free radical attack, and high G6Pase activities remained the same and they contributed to membrane stability. So tuna oil diet seems to protect hepatocarcinogenesis.
This study examined the anti-cancer effects of diallyl sulfide(DAS) and/or diallyl disulfide(DDS), major components of garlic oil, with the DEN-PH model in rats, by the numbers and areas per cm$^2$ of induced glutathion S-transferase placental form(GST-P) positive foci and silver-stained nucleolar organizer regions(Ag-NORs) counts per nuclei in liver as indicator. Sprague-Dawley(SD) rats were given the diethylnitrosamine(DEN, 200 mg/kg, i.p.) as initiator and 2 weeks later, in experiment 1, rats were treated with DAS(200 mg/kg, i.g.) and/or DDS(50 mg/kg, i.g.) for 6 weeks, respectively and concomitantly and also were given the same dose of DAS and/or DDS prior to DEN treatment for 2 weeks, and in experiment II, rats were treated with potential cancer promoter, 2-acetylaminofluorene (2-AAF, 20 mg/kg, i.g.). The DAS and/or DDS were treated prior to 2-AAF for 8 weeks, respectively and concomitantly. Then the anti-promoting effects of DAS and/or DDS were assessed. All rats were subjected to the two-thirds partial hepatectomy(PH) at week 3 and sacrificed at week 8. In experiment I, DAS and/or DDS treatment only prior to DEN showed inhibition of the development of GST-P positive foci. In experiment II, DAS and/or DDS treatment prior to 2-AAF promotion showed obvious inhibition of the development of GST-P positive foci in numbers and areas and AgNORs counts. In conclusion, We found DAS and/or DDS had the preventive effects on the hepatocarcinogenesis in rats and the concomitant treatment had some additive effects compared with the each treatment and AgNORs counts correlated well with the preneoplastic hepatic lesion.
The purpose of this study was to examine the chemopreventive potential of taurine at various levels on the diethylnitrosamine (DEN)·induced hepatocarcinogenesis. Male Sprague-Dawley rats were fed on diets containing 0, 1, 2, 3% taurine or 5% ${\beta}-alanine$ for taurine depletion. Then they were treated with DEN and 2/3 partial hepatectomy. The number of placental glutathione S-transferase positive ($GST-P^+$) foci, as a preneoplastic marker in the 1 % taurine group was lower than the control diet group. However the difference was insignificant. Although taurine diets reduced the thiobarbituric acid reactive substance (TBARS) level, the number of $GST-P^+$ foci was increased in 3% taurine diet group. The 1 % taurine diet increased the glutathione (GSH) level and GST activity, however they unfortunately did not suppress the foci formation. In the 3% taurine group, the GSH level and GSH peroxidase (GPx) activity were significantly decreased. Excess taurine supplementation of the pharmaceutical dose worked against hepatic chemoprevention, which might result from modulation of GPx activity and GSH utility. On the contrary, taurine might work as an antioxidant against TBARS production as the 1 % taurine diet increased GSH level. The potency of the cancer preventive effect of taurine still remains and further studies should investigate the effect of taurine with less than 1 % levels on the prevention of hepatic cancer.
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