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Submitted on April 25, 2005
Accepted on May 17, 2005
Departments of Physiology and Biophysicsand Obstetrics and Gynecology, University of Washington, Seattle WA, USA; Department of Biochemistry and Molecular Genetics. University of Virginia, Charlottesville, VA, USA
* To whom correspondence should be addressed. E-mail: steiner{at}u.washington.edu.
The Kiss1 gene encodes a family of neuropeptides called kisspeptins, which activate the receptor GPR54 and play a role in the neuroendocrine regulation of gonadotropin-releasing hormone (GnRH) secretion. We examined whether estradiol (E2) regulates KiSS-1 in the forebrain of the female mouse by comparing KiSS-1 mRNA expression among groups of ovary-intact (diestrus), ovariectomized (OVX), and OVX plus E2-treated mice. In the arcuate nucleus (Arc), KiSS-1 expression increased following ovariectomy and decreased with E2 treatment. Conversely, in the anteroventral periventricular nucleus (AVPV), KiSS-1 expression was reduced following ovariectomy and increased with E2 treatment. To determine whether the effects of E2 on KiSS-1 are mediated through estrogen receptor
(ER
) or ER
(ER
), we evaluated the effects of E2 in OVX mice that lacked functional ER
(ER
KO) or ER
(ER
KO). In ER
KO mice, KiSS-1 mRNA did not respond to E2 in either the Arc or AVPV, suggesting that ER
is essential for mediating the inhibitory and stimulatory effects of E2. In contrast, KiSS-1 mRNA in ER
KO mice responded to E2 exactly as WT animals. Double-label in situ hybridization revealed that virtually all KiSS-1-expressing neurons in the Arc and AVPV coexpress ER
, suggesting that the effects of E2 are mediated directly through KiSS-1 neurons. We conclude that KiSS-1 neurons in the Arc, which are inhibited by E2, may play a role in the negative feedback regulation of GnRH secretion, whereas KiSS-1 neurons in the AVPV, which are stimulated by E2, may participate in the positive feedback regulation of GnRH secretion.
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