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- W1575479600 abstract "The glycoprotein hormone common alpha-subunit can be induced in HeLa and other nontrophoblastic tumor cell lines by sodium butyrate. This report demonstrates that production of alpha-subunit can be further modulated by theophylline, especially in conjunction with butyrate. This synergism was not observed with other phosphodiesterase inhibitors such as xanthine, caffeine, theobromine, or methylisobutylxanthine. Induction by a combination of the short chain fatty acid plus the methylxanthine results from a decrease in the lag time after effector addition as well as a change in the rate of subunit accumulation. The increase in alpha-subunit is correlated with an increase in the levels of alpha-subunit mRNA, suggesting that induction is manifest at a pretranslational stage. The production of alpha-subunit was only marginally affected in cultures treated with 8-Br-cAMP or forskolin. Intracellular levels of cAMP were increased approximately threefold by methylisobutylxanthine, twofold by theophylline, fourfold by forskolin, and about 50% by butyrate, yet significant induction was achieved only by butyrate and theophylline. Taken together, these data suggest that the synergism between butyrate and theophylline is not mediated by cAMP." @default.
- W1575479600 created "2016-06-24" @default.
- W1575479600 creator A5060235113 @default.
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- W1575479600 date "1990-07-01" @default.
- W1575479600 modified "2023-10-17" @default.
- W1575479600 title "Enhancement by theophylline of the butyrate-mediated induction of choriogonadotropin α-subunit in HeLa cells" @default.
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- W1575479600 doi "https://doi.org/10.1016/0003-9861(90)90522-z" @default.
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