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Peripheral kisspeptin reverses short photoperiod-induced gonadal regression in Syrian hamsters by promoting GNRH release
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Ansel, L., Bentsen, A. H., Ancel, C., Bolborea, Matei, Klosen, P., Mikkelsen, J. D. and Simonneaux, V. (2011) Peripheral kisspeptin reverses short photoperiod-induced gonadal regression in Syrian hamsters by promoting GNRH release. Reproduction, 142 (3). pp. 417-425. doi:10.1530/REP-10-0313 ISSN 1470-1626.
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Official URL: http://dx.doi.org/10.1530/REP-10-0313
Abstract
In seasonal breeders, reproduction is synchronised by day length via the pineal hormone melatonin. In short winter days (short day, SD), the Syrian hamster displays a complete gonadal atrophy together with a marked reduction in expression of kisspeptins (Kp), a family of potent hypothalamic stimulators of GNRH neurons. Both central and peripheral acute injections of Kp have been reported to activate the gonadotropic axis in mammals. The aim of this study was to determine if and how peripheral administration of Kp54 could restore gonadal function in photo-inhibited hamsters. Testicular activity of hamsters kept in SD was reactivated by two daily i.p. injections of Kp54 but not by chronic subcutaneous delivery of the same peptide via mini-pumps. Acute i.p. injection of Kp54-induced FOS (c-Fos) expression in a large number of GNRH neurons and pituitary gonadotrophs together with a strong increase in circulating testosterone. The activation of pituitary cells by Kp was inhibited by preadministration of the GNRH receptor antagonist acyline. Altogether, our results demonstrate that peripheral Kp54 activates the gonadotropic axis by stimulating GNRH release and indicate that an appropriate protocol of long-term systemic Kp administration can recrudesce a photo-inhibited reproductive axis.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||||
Journal or Publication Title: | Reproduction | ||||||
Publisher: | BioScientifica Ltd. | ||||||
ISSN: | 1470-1626 | ||||||
Official Date: | 1 September 2011 | ||||||
Dates: |
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Volume: | 142 | ||||||
Number: | 3 | ||||||
Number of Pages: | 9 | ||||||
Page Range: | pp. 417-425 | ||||||
DOI: | 10.1530/REP-10-0313 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access |
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