在温带鱼中,在激发温度下对急性变暖的生理反应
Ian A Bouyoucos1,2, Alyssa M Weinrauch1,2, Ken M Jeffries1
1Department of Biological Sciences, University of Manitoba, Winnipeg, MB, Canada, R3T 2N2.
The Journal of experimental biology
|September 18, 2023
概括
狗鱼的激发温度会触发细胞应激反应,而不是降低心肺呼吸能力. 这一发现为鱼类耐热机制提供了新的见解.
科学领域:
- 生理学 生理学 生理学
- 生态生态学 生态生态学
- 生物化学 生物化学
背景情况:
- 热耐受性对于鱼类的生存至关重要,临界热最大值 (CTmax) 和振动温度是关键极限.
- 激发温度的生理基础,特别是心肺和细胞应激反应,仍然未被充分探索.
研究的目的:
- 调查弹性枝状动物的激发温度是否与心肺呼吸功能下降和细胞应激有关.
- 为了区分在激发温度下的生理反应与太平洋鱼的CTmax.
主要方法:
- 评估了太平洋鱼 (Squalus suckleyi) 的心肺呼吸和全身热极限.
- 测量生物化学标记物 (酶活性,乳酸盐) 和分子标记物 (hsp70,hif1α的基因表达) 在振动温度和CTmax.
主要成果:
- 刺激温度与心率增加和白肌肉酸合成酶活性相关,表明有氧代谢.
- 细胞应激,标志着高hsp70,在下丘脑,和心室的激发温度下观察到.
- CTmax的特点是由于无氧乳酸盐生产而引起的代谢酸性化,与激发温度不同.
结论:
- 细胞应激,而不是降低心肺呼吸能力,是狗鱼激发温度的特征.
- 这些发现部分支持了这一假设,突出了鱼类耐热度的独特生理值.
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