生命早期的冷却改变了以后的皮质激素对抑制的反应,在初生东部蓝鸟 (
Physiological and biochemical zoology : PBZ
|June 6, 2023
概括
蓝鸟在生命早期的冷却最初会提高皮质,但会抑制后来的压力反应. 这表明,早期的环境挑战会影响下丘脑-垂体-上腺轴的发育和功能.
科学领域:
- 内分泌学 在内分泌学.
- 环境生理学环境生理学
- 鸟类生物学 鸟类生物学
背景情况:
- 生命早期的环境压力因素可以显著影响下丘脑-垂体-上腺 (HPA) 轴的发展.
- 葡萄糖皮质类药物,就像鸟类中的皮质,在应激反应和发育中起着至关重要的作用.
- 早期暴露于高水平的葡萄糖皮质激素可以对生物体的生理产生持久的影响.
研究的目的:
- 调查在生命早期冷却后,东部蓝鸟中抑制皮质激素分泌的机制基础.
- 确定早期冷却是否会影响上腺对上腺皮质激素 (ACTH) 的敏感性.
- 为了检查早期冷却对皮质激素对克制压力的反应的影响.
主要方法:
- 东部蓝鸟在生活的早期被暴露在重复的冷却或控制温度中.
- 在ACTH注射后评估了上腺皮质激素生产能力.
- 测量了对克制压力的皮质激素反应.
- 在冷却和对照组中评估了对外源性ACTH的上腺敏感性.
主要成果:
- 在ACTH注射后,冷却和对照幼都显示出较高的皮质分泌,与限制相比.
- 冷却后的幼在应对约束压力时表现出减少的皮质类固醇分泌.
- 在冷却和对照幼之间没有观察到对外源性ACTH的上腺敏感性的显著差异.
结论:
- 在东部蓝鸟中,生命早期的冷却导致生命后期对克制压力的皮质激素反应减弱.
- 这种减弱反应的机制似乎不涉及对ACTH的上腺敏感性改变.
- 研究结果表明,早期的环境冷却可能会影响下丘脑-垂体-上腺轴内的更高的调节水平.
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