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- W1544178146 abstract "A single injection of dibutyryl cyclic AMP (Bt2cAMP) into adrenalectomized rats results in rapid and proportionate increases in hepatic tyrosine aminotransferase catalytic activity and in the amount of functional mRNA coding for this enzyme. This effect is transient in that mRNATAT peaks at 0.065% of total poly(A)+RNA activity at 1 h and is back to the basal level of 0.012% in 2.5 h. Enzyme activity peaks at 2.5 h and is back to the basal level by 5 h. If Bt2cAMP is repeatedly injected (0, 1, 2.5, and 4 h), enzyme activity remains at maximal levels for 4 to 5 h, whereas changes in mRNATAT activity are identical with those observed in the single injected rats. The rate of tyrosine aminotransferase synthesis at 5.5 h in the multiply injected rats, a time when mRNATAT has already returned to the basal level, is 3 to 4 times greater than that in either control or singly injected rats at the same time (0.3% of total protein versus 0.07%) and is equivalent to the maximal rate seen 1 h after the initial injection of the cyclic nucleotide. Since the rate of synthesis is increased in proportion to the increase in enzyme catalytic activity, stabilization of the enzyme against degradation is excluded as an induction mechanism at this late time point. These responses are not due to differences in the metabolism of Bt2cAMP, and the effect depends on the presence of metabolically active derivatives of this nucleotide. It thus appears that Bt2cAMP induces the synthesis of tyrosine aminotransferase in rat liver in two distinct ways. One is pretranslational and involves a transient and rapid increase in mRNATAT activity. The second appears to involve a delayed but sustained increase in translation of a basal level of mRNATAT." @default.
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- W1544178146 date "1982-03-01" @default.
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- W1544178146 title "Evidence for a dual effect of dibutyryl cyclic AMP on the synthesis of tyrosine aminotransferase in rat liver." @default.
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- W1544178146 doi "https://doi.org/10.1016/s0021-9258(18)34934-2" @default.
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