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- W2017341771 abstract "The regulation of 3 beta-hydroxysteroid dehydrogenase, delta 4,5-isomerase (3 beta-HSD) and hydroxysteroid sulfotransferase (HST) activities by ACTH and thyroid hormones was investigated in cell cultures from the fetal zone or definitive zone of the human fetal adrenal cortex, using a serum-free, defined medium. ACTH alone maximally stimulated the 3 beta-HSD activity several-fold, whereas triiodothyronine (T3) alone had no effect on this enzyme activity in cell cultures from each zone. However, treatment of cultures with maximal concentrations of 10 nM ACTH plus 1 nM T3 significantly increased the 3 beta-HSD activity an additional 59-115% over that for ACTH alone, without alteration of the ACTH ED50 (0.3 nM). The T3 ED50 was 31 pM for this interaction with ACTH. Thyroxine at a reduced sensitivity had the same interaction with ACTH. T3 similarly increased the stimulation of 3 beta-HSD activity by the steroidogenic agents, cholera toxin and a cAMP analog. The HST activity was not affected by T3 alone but was stimulated by ACTH alone. This stimulation was an order of magnitude less than that for the 3 beta-HSD activity in the same cultures. ACTH plus T3 did not have the synergistic effect on HST activity as observed for the 3 beta-HSD activity. These studies show an interaction between ACTH and thyroid hormone for the stimulation of 3 beta-HSD activity in cell cultures of the human fetal adrenal cortex." @default.
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- W2017341771 title "ACTH and thyroid hormone regulation of 3β-hydroxysteroid dehydrogenase activity in human fetal adrenocortical cells" @default.
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- W2017341771 doi "https://doi.org/10.1016/0022-4731(86)90336-5" @default.
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