Estradiol stimulates gene expression of norepinephrine biosynthetic enzymes in rat locus coeruleus

Neuroendocrinology
L I SerovaE L Sabban

Abstract

Gender-specific differences in susceptibility to a number of disorders related to catecholaminergic systems, including depression and hypertension, have been postulated to be mediated, at least in part, by estrogens. In this study, we examined if estrogens may regulate gene expression of norepinephrine biosynthetic enzymes. Administration of five injections of 15 or 40 microg/kg estradiol benzoate to ovariectomized (OVX) female rats elicited a dose-dependent elevation in mRNA levels of tyrosine hydroxylase (TH) in locus coeruleus, to as great as 3-fold over control. Dopamine beta-hydroxylase (DBH) mRNA levels were also similarly increased. To examine the mechanism, PC12 cells were cotransfected with luciferase reporter constructs under control of DBH or TH promoters [pDBH/Luc(-2,236/+21) or pTH/Luc(-272/+27 or -773/+27)] with an expression vector for estradiol receptor alpha. The cells were treated with 17beta-estradiol (E(2)) for 12-36 h. E(2) triggered a several fold increase in luciferase activity under control of the DBH promoter in a dose-dependent fashion. Omission of estrogen receptor alpha or addition of the estrogen receptor antagonist ICI 182,780 prevented the DBH promoter-driven increase in luciferase. When E(2) was ...Continue Reading

Citations

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