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- W2013376734 abstract "In the present study the effect of all-trans-retinoic acid (RA) on nuclear RNA polymerase activity in N-methyl-N-nitrosourea (MNU)-induced mammary tumors was investigated. Three experimental protocols were used. (1) The tumor mince was incubated with 1 microM RA for 30 min at 30 degrees C; the RNA polymerase activity was measured in the purified nuclei and compared with control nuclei. (2) In order to evaluate the influence of retinoic binding protein on enzyme activity, mammary tumor nuclei were incubated with RA bound cytosolic retinoic acid binding protein complex (RA-CRABP) at 25 degrees C for 30 min. This step allows the complex to translocate into the nuclei. The enzyme activity in these nuclei was compared with the nuclei pre-incubated with buffer or cytosol. (3) Finally, the influence of the addition of RA-CRABP complex directly into the RNA polymerase reaction mixture was determined and compared with appropriate controls. Results indicated that the RNA polymerase activity in the nuclei of RA treated tissue as well as in the nuclei subsequent to the translocation step was significantly reduced. However, the addition of RA-CRABP into the reaction mixture did not alter the enzyme activity. These results suggest that alteration of RNA polymerase activity may be an essential step in the retinoid action in mammary tissues." @default.
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- W2013376734 date "1988-09-01" @default.
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- W2013376734 title "Effect of all-trans-retinoic acid on nuclear RNA polymerase activity in chemically-induced rat mammary tumors" @default.
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- W2013376734 doi "https://doi.org/10.1016/0304-3835(88)90231-5" @default.
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