Hypothalamic-pituitary-gonadal axis response to photoperiod changes in female guanacos (Lama guanicoe)

IF 2.1 3区医学 Q3 ENDOCRINOLOGY & METABOLISM

General and comparative endocrinology Pub Date : 2023-12-22 DOI:10.1016/j.ygcen.2023.114427

Lina Maria Correa , Ricardo D. Moreno , José Luis Riveros

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Abstract

The guanaco, a wild South American camelid, is renowned for its remarkable resilience to extreme conditions. Despite this, little is known about how reproductive hormones in female camelids are influenced during their seasonal breeding period, which occurs during long photoperiod. To explore this, the study investigated the response of the hypothalamic-pituitary–gonadal axis in female guanacos during short days (10L:14D; July) and long days (16L:8D; December) in the Mediterranean ecosystem (33°38′28″S, 70°34′27″W). Blood samples from 14 adult animals were collected, and measurements of melatonin, 17β-estradiol, FSH, and LH concentrations were taken. The results showed that melatonin concentration was lower (P < 0.05) during long days than short days, whereas 17β-estradiol, FSH, and LH concentrations were higher (P < 0.05) during long days compared to short days. Furthermore, the study detected the expression of the melatonin receptor 1A and kisspeptin in the hypothalamus and pituitary, suggesting that the pineal gland of female guanacos is sensitive to seasonal changes in day length. These findings also indicate a seasonal variation in the concentration of reproductive hormones, likely linked to the distinct modulation of the hypothalamic-pituitary-gonadal axis of female guanacos during short and long days.

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雌性鬣羚下丘脑-垂体-性腺轴对光周期变化的反应

南美洲野生驼科动物瓜纳科（Guanaco）以其对极端条件的超强适应能力而闻名。尽管如此，人们对雌性驼科动物在长光周期的季节性繁殖期间生殖激素如何受到影响却知之甚少。为了探讨这个问题，本研究调查了地中海生态系统（南纬 33°38′28″，西经 70°34′27″）中短日照（10L:14D，7 月）和长日照（16L:8D，12 月）期间雌性驼科动物下丘脑-垂体-性腺轴的反应。采集了 14 只成年动物的血液样本，并测量了褪黑激素、17β-雌二醇、前列腺激素和促性腺激素的浓度。结果表明，褪黑激素浓度在长日照期间低于短日照期间（P < 0.05），而17β-雌二醇、FSH和LH浓度在长日照期间高于短日照期间（P < 0.05）。此外，研究还检测到褪黑激素受体 1A 和吻肽在下丘脑和垂体中的表达，这表明雌性观赏鸟的松果体对昼长的季节性变化很敏感。这些研究结果还表明，生殖激素的浓度存在季节性变化，这很可能与雌性鸠拉鹦鹉的下丘脑-垂体-性腺轴在短日照和长日照期间的不同调节有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

General and comparative endocrinology 医学-内分泌学与代谢

CiteScore

5.60

自引率

7.40%

发文量

120

审稿时长

2 months

期刊介绍： General and Comparative Endocrinology publishes articles concerned with the many complexities of vertebrate and invertebrate endocrine systems at the sub-molecular, molecular, cellular and organismal levels of analysis.