水的限制增加了室内氨基酸的氧化在家里 (家里) (Passer domesticus)
Elizabeth J Rogers1, Alexander R Gerson1,2
1Organismic and Evolutionary Biology Program, University of Massachusetts Amherst, Amherst, MA 01003, USA.
The Journal of experimental biology
|February 21, 2024
概括
受到水限制的鸟类增加了蛋白质分解,并氧化了代谢水的氨基酸. 这种策略,通过瘦肉质量损失和呼出的二氧化碳变化来证明,有助于鸟类应对脱水.
科学领域:
- 动物生理学 动物生理学
- 代谢生物化学 代谢生物化学
- 鸟类生物学 鸟类生物学
背景情况:
- 动物使用行为和生理适应来管理脱水.
- 鸟类在失去水的过程中增加了蛋白质代谢,产生了代谢水.
- 在鸟类脱水期间调动的氨基酸的命运仍然不清楚.
研究的目的:
- 为了调查水限制的鸟类是否会氧化氨基酸以获得额外的代谢水.
- 为了确定氨基酸氧化对鸟类水平衡的贡献.
主要方法:
- 在9周的时间里,养的子被食13C标记的白,以标记内源蛋白质.
- 每周的试验测量了瘦肉质量,脂肪质量,新陈代谢率,以及呼出的二氧化碳中13C丰富度 (δ13Cbreath).
- 对照组对限制水分的鸟类的生理反应进行比较.
主要成果:
- 限制饮水的鸟类表现出增加的瘦组织代谢.
- 在受水限制的鸟类中观察到富含 δ13C呼吸,支持氨基酸氧化.
- δ13C呼吸的变化与代谢速率和限制饮水的持续时间相关.
结论:
- 鸟类在脱水过程中消化瘦肉组织并氧化产生的氨基酸,产生代谢水.
- 这提供了一个额外的水源,不仅仅是来自蛋白质代谢.
- 鸟类可以根据新陈代谢率和水的可用性调整蛋白质节约.
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