Title : Estradiol attenuates the forskolin-induced increase in hypothalamic tyrosine hydroxylase activity.

Pub. Date : 2000 Apr

PMID : 10773741






10 Functional Relationships(s)
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1 Estradiol attenuates the forskolin-induced increase in hypothalamic tyrosine hydroxylase activity. Colforsin tyrosine hydroxylase Rattus norvegicus
2 The first experiment examined the ability of forskolin to activate TH in the tuberoinfundibular dopaminergic neurons of adult ovariectomized rats with or without estradiol treatment. Colforsin tyrosine hydroxylase Rattus norvegicus
3 Estradiol treatment reduced both basal and forskolin-stimulated TH activity in the median eminence. Colforsin tyrosine hydroxylase Rattus norvegicus
4 The second group of experiments examined the effect of estradiol on the forskolin-induced activation of TH in fetal hypothalamic cells cultures. Colforsin tyrosine hydroxylase Rattus norvegicus
5 Forskolin treatment for 1 h increased TH activity in a concentration-dependent manner in control and estradiol-treated cells, but estradiol attenuated the stimulatory response to 0.01-10 microM forskolin. Colforsin tyrosine hydroxylase Rattus norvegicus
6 The suppressive effect of estradiol on cAMP-dependent activation of TH was evident with 1-12 h of forskolin treatment. Colforsin tyrosine hydroxylase Rattus norvegicus
7 Forskolin treatment for 1 h increased radiolabeled phosphate incorporation into TH protein in control but not estradiol-treated cells, suggesting that estradiol interferes with the ability of the cAMP pathway to phosphorylate TH. Colforsin tyrosine hydroxylase Rattus norvegicus
8 Forskolin treatment for 1 h increased radiolabeled phosphate incorporation into TH protein in control but not estradiol-treated cells, suggesting that estradiol interferes with the ability of the cAMP pathway to phosphorylate TH. Colforsin tyrosine hydroxylase Rattus norvegicus
9 Forskolin caused a time-dependent increase in TH mRNA signal levels in control cultures. Colforsin tyrosine hydroxylase Rattus norvegicus
10 The magnitude of the forskolin-induced increase in TH mRNA levels was less in the estradiol-treated cells after 6 h of forskolin treatment, indicating that estradiol hinders cAMP-regulated TH gene expression. Colforsin tyrosine hydroxylase Rattus norvegicus