Academic Journal
The Content of Thyroid Hormone Receptor α in Ewe Kisspeptin Neurones is not Season-Dependent
| العنوان: | The Content of Thyroid Hormone Receptor α in Ewe Kisspeptin Neurones is not Season-Dependent |
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| المؤلفون: | Dufourny, Laurence, Gennetay, D., Martinet, S., Lomet, Didier, Caraty, A. |
| المساهمون: | Physiologie de la reproduction et des comportements Nouzilly (PRC), Institut National de la Recherche Agronomique (INRA)-Institut Français du Cheval et de l'Equitation Saumur -Université de Tours-Centre National de la Recherche Scientifique (CNRS) |
| المصدر: | ISSN: 0953-8194. |
| بيانات النشر: | HAL CCSD Wiley |
| سنة النشر: | 2016 |
| المجموعة: | Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
| مصطلحات موضوعية: | seasonal reproduction, triiodothyronin, immunocytochemistry, hypothalamic explants, sheep, [SDV]Life Sciences [q-bio], [SCCO]Cognitive science |
| الوصف: | International audience ; Seasonal reproduction is grounded in several mechanisms, among which are plasticity in both hormone synthesis and neuronal networks. Increased daylength on long days (LD) translates into local tri-iodothyronin (T3) production in the mediobasal hypothalamus that will enable the transition to the anoestrus season in sheep. The photoperiod also strongly affects the content of kisspeptin (Kiss), a hypothalamic neuropeptide exerting a potent stimulatory effect on gonadotrophin-releasing hormone release. Our hypothesis was that T3 directly inhibits Kiss release during LD. Using double immunocytochemistry, we first searched for coexpression of thyroid hormone receptor (THR) in Kiss neurones in ewes with an active or inactive gonadotrophic axis. In both the preoptic area and the arcuate nucleus, most Kiss neurones were labelled by THR antibody under both physiological/photoperiodic conditions. These results suggest thyroid hormones may affect Kiss synthesis and release all through the year. We then attempted to assess the influence of T3 on Kiss content in hypothalamic explants sampled from ewes with an active gonadotrophic axis. Kiss produced by hypothalamic explants cultured with different doses of T3 (300 or 600pg) and subjected to different times of incubation (2 or 24h) was measured. No significant effects of T3 on Kiss tissular content were observed for the two doses of T3 and for the two incubation times. In light of these findings, potential reasons for the divergent effects of thyroid hormones on Kiss content are discussed. Our data emphasise that the effects of thyroid hormone on Kiss synthesis are not one-sided and may affect a wide range of functions. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | hal-03159334; https://hal.inrae.fr/hal-03159334; WOS: 000371434100002 |
| DOI: | 10.1111/jne.12344 |
| الاتاحة: | https://hal.inrae.fr/hal-03159334 https://doi.org/10.1111/jne.12344 |
| رقم الانضمام: | edsbas.FF203C07 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1111/jne.12344 |
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