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-Deficient Mice1
Departments of Obstetrics & Gynecology (Sa.K.D., J.T.) and Molecular and Integrative Physiology (B.C.P., Su.K.D., Sa.K.D), Ralph L. Smith Research Center, University of Kansas Medical Center, Kansas City, Kansas 66160; and Department of Biochemistry and Child Health (D.B.L), University of Missouri, Columbia, Missouri 65211
Address all correspondence and requests for reprints to: S. K. Das, Departments of Obstetrics & Gynecology and Molecular and Integrative Physiology, MRRC 37/3017, University of Kansas Medical Center, 39th and Rainbow Boulevard, Kansas City, Kansas 66160-7338. E-mail: sdas{at}kumc.edu
Embryo-uterine interactions leading to the attachment reaction is
followed by stromal cell proliferation and differentiation into
decidual cells (decidualization) at the sites of blastocyst apposition.
In rodents, decidualization is also induced by application of an
artificial stimulus (intraluminal oil infusion) in a pseudopregnant
uterus, or to one that has been appropriately prepared by exogenous
progesterone (P4) and estrogen. The process of
decidualization is under the control of these steroids in the presence
of blastocysts or deciduogenic stimuli. Although it is well known that
estrogen is required for the induction of progesterone receptors in the
uterus, the functional importance of estrogen in the process of
decidualization is poorly understood. To better understand the role of
estrogenic actions in decidualization, we used wild-type and estrogen
receptor-
knock-out (ERKO) mice for induction of decidualization
employing a defined steroid hormonal treatment schedule. Our results
demonstrate that P4 alone induces decidualization in
ovariectomized wild-type or ERKO mice in response to intraluminal oil
infusion in the absence of estrogen. A combined treatment of either
estradiol-17ß (E2) or its catecholmetabolite
4-hydroxyestradiol-17ß (4-OH-E2) with P4 does
not potentiate the decidual response produced by P4
treatment alone in either ovariectomized wild-type or ERKO mice. The
induction of decidual response was associated with up-regulation of
decidual cell marker genes, such as progesterone receptor,
metallothionein-1, and cyclooxygenase-2. The results suggest that the
stromal cell sensitivity to decidualization is critically dependent on
P4-regulated events, and estrogenic induction of
progesterone receptor via classical nuclear ER-
is not critical for
this process.
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