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• W2010069008 abstract "The two independently derived hepatoma cell lines (HTC and Fu5-5) have previously been shown to display different sensitivities for the induction of tyrosine aminotransferase (TAT) enzyme activity and mRNA levels by glucocorticoids with the enzyme being half-maximally induced at approximately 7-fold higher concentrations of dexamethasone in HTC cells than in Fu5-5 cells. In the present study we investigated the induction of TAT activity by cAMP in order to see whether the difference is limited to the steroidal induction. Using the stable cAMP derivative (8-(4-chlorophenylthio)-cAMP) as an inducer, we found that a 6-fold higher cAMP concentration was needed in HTC cells to achieve the same extent of enzyme induction as in Fu5-5 cells. The induction of TAT enzyme activity could be accounted for by an increased amount of TAT mRNA. Further experiments involving sequential addition of both inducers in general showed a synergism of steroids and cAMP for TAT induction in HTC cells only at submaximal concentrations of steroid; in Fu5-5 cells, the occurrence of synergism depended on the order of addition of inducers. The maximal response in HTC cells was limited to the value that could be achieved by induction with steroid alone. In Fu5-5 cells, however, the steroid response could be augmented when cAMP was added to cells already maximally induced by steroid. This demonstrates that the effect of a combination of cAMP and steroids depends on their concentration, the sequence of their addition, and the rat hepatoma cell line used. Collectively the data suggest that a common pretranslational event determines the differential sensitivity of TAT induction by glucocorticoids and by cAMP in HTC and Fu5-5 cells. Furthermore a second, or possibly the same, common event also regulates the maximum level of TAT induction that is obtainable under most conditions with glucocorticoids and/or cAMP." @default.
• W2010069008 created "2016-06-24" @default.
• W2010069008 creator A5008455123 @default.
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• W2010069008 date "1987-01-01" @default.
• W2010069008 modified "2023-09-27" @default.
• W2010069008 title "Differential Sensitivity of HTC and Fu5-5 Cells for Induction of Tyrosine Aminotransferase by 3′,5′-Cyclic Adenosine Monophosphate" @default.
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• W2010069008 doi "https://doi.org/10.1210/mend-1-1-109" @default.
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