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and ß in Rat Decidua Cells: Cell-Specific Expression and Differential Regulation by Steroid Hormones and Prolactin1
Department of Physiology and Biophysics, University of Illinois College of Medicine (C.T., S.D., A.P.-T., S.F.-G., G.B.G., G.G.), Chicago, Illinois 60612; and Department of Physiology, Faculty of Medicine, University of Manitoba (R.P.C.S.), Winnipeg, Manitoba, Canada R3E 0W3
Address all correspondence and requests for reprints to: Dr. Geula Gibori, Department of Physiology and Biophysics (M/C 901), University of Illinois, 835 South Wolcott Avenue, Chicago, Illinois 60612-7342. E-mail: ggibori{at}uic.edu
Estradiol is known to play an important role in the growth and
differentiation of rat uterine stromal cells into decidual cells. In
particular, this hormone with progesterone is necessary for blastocyst
implantation and subsequent decidualization in the rat. Although
binding experiments have demonstrated the presence of estrogen-binding
sites, no evidence exists as to whether the rat decidua expresses both
isoforms of the estrogen receptor (ER),
and ß. In this
investigation, we analyzed the expression of decidual ER
and ERß,
studied their regulation by PRL and steroid hormones and examined the
ability of decidual ERß to transduce the estradiol signal to the
progesterone receptor. Immunocytochemistry, RT-PCR, and Northern blot
analysis showed that both ER species are coexpressed in the decidua
during pseudopregnancy. Interestingly, these genes were preferentially
found in a cell population localized in the antimesometrial site of the
uterus where blastocyst implantation takes place. Using decidual cells
in primary culture obtained from pseudopregnant rats and a
decidua-derived cell line (GG-AD), we show a differential regulation of
ER
and ERß by PRL and ovarian steroid hormones. Whereas PRL,
estradiol, and progesterone all increased ERß messenger RNA (mRNA)
expression in a dose-dependent manner, only PRL up-regulated the mRNA
levels of ER
. Estradiol had no effect on ER
expression, whereas
progesterone markedly decreased its mRNA levels. Interestingly,
progesterone, which up-regulates the ability of PRL to signal to a
PRL-regulated gene in mammary-gland derived cells, prevented PRL
stimulation of decidual ER
and had no synergistic effect on ERß
expression. The use of GG-AD cells, which express only ERß, allowed
us to demonstrate that this receptor subtype is functional and
transduces estradiol signal to the progesterone receptor. In summary,
the results of this investigation have revealed that ERß is expressed
in addition to ER
in the rat decidua, and that the expression of
both ERs are cell specific and differentially regulated by PRL and
steroids. One salient finding of this investigation is that
progesterone down-regulates ER
, but concomitantly increases the
expression of a functional ERß that mediates estradiol up-regulation
of the decidual progesterone receptor.
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