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298 results on '"Taga, H."'

13. Inhibition by 1-(2-tetrahydrofuryl)-5-fluorouracil in combination with uracil of hepatocarcinogenesis induced by 3'-methyl-4-dimethylaminoazobenzene in rats

Author

Sakamoto S, Hirai H, Taga H, Uchikoshi T, Sunaga T, Endo Y, Kudo H, Kato T, Noriyuki Kasahara, and Kuwa K

Subjects
Male, Methyldimethylaminoazobenzene, Liver Neoplasms, Experimental, Liver, Reference Values, Biomarkers, Tumor, Animals, Rats, Inbred Strains, alpha-Fetoproteins, Uracil, Thymidine Kinase, Rats, Tegafur
Abstract

It is known that a high incidence of hepatocellular carcinoma in rat liver can be induced by 3'-methyl-4-dimethylaminoazobenzene (3'-MeDAB). The administration of 3'-MeDAB in combination with 1-(2-tetrahydrofuryl)-5-fluorouracil and uracil (UFT) delayed the appearance of oval cells and the formation of hyperplastic nodules, which were observed in the liver from 3 and 5 weeks, respectively, after the onset of 3'-MeDAB feeding, and also delayed the transient increase of serum alpha-fetoprotein level, which transiently peaked at 5 weeks, and completely suppressed the transient increase of tissue thymidylate synthetase activity, but not thymidine kinase, which were induced by 3'-MeDAB at 5 weeks, and finally reduced markedly the incidence of hepatocarcinomas. These results indicate that the suppression of de novo synthesis in pyrimidine metabolism prevents hepatocarcinogenesis.

Published
1991

14. Effects of abomasal infusion of conjugated linoleic acids, Sterculia foetida oil, and fish oil on production performance and the extent of fatty acid Δ9-desaturation in dairy cows.

Author

Dallaire, M. P., Taga, H., Ma, L., Corl, B. A., Gervais, R., Lebeuf, Y., Richard, F. J., and Chouinard, P. Y.

Subjects
*CONJUGATED linoleic acid, *LINOLEIC acid, *STERCULIA, *DESATURASES, *FISH oils
Abstract

The purpose of this study was to determine the effects of conjugated linoleic acid (CLA), Sterculia foetida oil (STO), and fish oil (FO) on milk yield and composition, milk FA profile, Δ9 -desaturation activity, and mammary expression of 2 isoforms of stearoyl-coenzyme A desaturase (SCD-1 and SCD-5) in lactating dairy cows. Eight multiparous Holstein cows (69 ± 13 d postpartum) were used in a double 4 x 4 Latin square design with 28-d periods. For the first 14 d of each period, cows received an abomasal infusion of (1) 406 g of a saturated fatty acid (SFA) supplement (112 g of 16:0 + 230 g of 18:0) used as a control (CTL), (2) 36 g of a CLA supplement (13.9 g of trans-10,cis-12 18:2) + 370 g of SFA, (3) 7 g of STO (3.1 g of 19:1 cyclo) + 399 g of SFA, or (4) 406 g of FO (55.2 g of cis-5,-8,-11,-14,-17 20:5 + 59.3 g of cis-4,-7,-10,-13,-16,-19 22:6). Infusions were followed by a 14-d washout interval. Compared with CTL, STO decreased milk yield from 38.0 to 33.0 kg/d, and increased milk fat concentration from 3.79 to 4.45%. Milk fat concentration was also decreased by CLA (2.23%) and FO (3.34%). Milk fat yield was not affected by STO (1,475 g/d) compared with CTL (1,431 g/d), but was decreased by CLA (774 g/d) and FO (1,186 g/d). Desaturase indices for 10:0, 12:0, and 20:0 were decreased, whereas the extent of desaturation of 14:0, 16:0, 17:0, and 18:0 was not affected by CLA treatment compared with CTL. Infusion of STO significantly decreased all calculated desaturase indices compared with CTL; the 14:0 index was reduced by 80.7%. Infusion of FO decreased the desaturase indices for 10:0, 14:0, 20:0, trans-11 18:1, and 18:0. The effect of FO on the 14:0 index indicates a decrease in apparent Δ9 -desaturase activity of 30.2%. Compared with CTL, mammary mRNA abundance of SCD-1 was increased by STO (+30%) and decreased by CLA (-24%), whereas FO had no effect. No effect was observed on mRNA abundance of SCD-5. In conclusion, abomasal infusion of CLA, STO, and FO were shown to exhibit varying and distinct effects on desaturase indices, an indicator of apparent SCD activity, and mammary mRNA abundance of SCD-1. [ABSTRACT FROM AUTHOR]

Published
2014
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16. [Thymidine kinase activities in sera and liver tissues during hepatocarcinogenesis in rats treated with 3'-methyl-4-dimethylaminoazobenzene (3'-MeDAB)]

Author

Sakamoto S, Kuwa K, Kawachi Y, Kudo H, Noriyuki Kasahara, Kato T, Okamoto R, Taga H, Hirai H, and Sunaga T

Subjects
Male, Methyldimethylaminoazobenzene, Liver Neoplasms, Experimental, Liver, Animals, Thymidine Kinase, Rats
Abstract

It is known that a high incidence of hepatocellular carcinoma in rat liver can be induced with 3'-methyl-4-dimethylaminoazobenzene (3'-MeDAB). In the present study, we investigated serum levels of alpha-fetoprotein (AFP) and thymidine kinase (TK), DNA-synthesizing enzyme in the salvage pathway, and tissue TK and its isozyme activities in the liver of rats treated with 3'-MeDAB. Serum TK activities rose abruptly right after the onset of 3'-MeDAB treatment, peaking after one week and then gradually decreasing. At 3 weeks, though serum TK was decreasing, serum AFP and tissue TK began to increase, and oval cells appeared in the liver. At 5 weeks, though serum TK reached a nadir, serum AFP and tissue TK formed transient peaks, and oval cells occupied a major part of the hepatic lobules with hyperplastic nodules. Thereafter, serum TK continued to increase, and serum AFP and tissue TK, after transiently decreasing, re-increased; at 20 weeks, each value was at high level, and mixed type hepatocarcinoma was observed. The liver TK isozymes were separated into 3 types by DEAE-cellulose column chromatography. A 3'-MeDAB induced a remarkable increase in activity of cytosolic and fetal type isozyme in non-tumorous regions of livers at 5 weeks and tumorous regions at 20 weeks. These results indicate that biochemical changes in 3'-MeDAB-treated rat liver may provide a valuable insight into two step process in hepatocarcinogenesis.

Published
1990

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