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在雄性小鼠中,雄性雌激素抑制皮质类固醇结合球蛋白,影响内分泌应激反应
Vera Sommers1,2,3, Max Gentenaar2,3, Karel David4,5
1Laboratory of Molecular Endocrinology, Department of Cellular and Molecular Medicine, KU Leuven, Campus Gasthuisberg ON1 Herestraat 49 - Box 901, 3000 Leuven, Belgium.
Endocrinology
|September 6, 2024
概括
在雄性小鼠中,雌激素缺乏会增加垂体ACTH和皮质类固醇结合球蛋白 (CBG),导致HPA轴活性和应激反应的改变. 这凸显了雄激素在调节压力轴上的作用.
科学领域:
- 内分泌学 在内分泌学.
- 神经内分泌学神经内分泌学
- 分子生物学分子生物学
背景情况:
- 生物性别会影响下丘脑-垂体-上腺 (HPA) 轴的活动.
- 对抗雄激素缺乏对HPA轴的影响尚不清楚.
研究的目的:
- 为了研究雄性小鼠在HPA轴上的雄激素状态的影响.
- 阐明在雄激素缺乏后,HPA轴活性发生变化的背后机制.
主要方法:
- 对血皮质和ACTH水平的评估.
- 德克萨米他抑制试验.
- 测量皮质类固醇结合型全球蛋白 (CBG) 水平和mRNA表达.
- 对肝脏中的基因表达和表观遗传修饰 (H3K27乙化) 的分析.
主要成果:
- 安卓素剥夺并没有改变总皮质,但增加了垂体ACTH.
- 压力诱导的皮质类固醇水平升高,德甲抑制受损.
- 血CBG水平和肝脏CBGmRNA显著增加,与增强的转录活性相关.
- 观察到较低的自由皮质和GR基因的改变表达.
结论:
- 素剥夺诱导CBG,可能降低自由皮质,减少HPA轴上的负反.
- 这导致雄性小鼠增加了应激反应能力.
- 性雄激素受体激活对于调节CBG,基因表达和HPA轴响应性至关重要.
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