Thermal acclimation of fast-growing Japanese Quails (Coturnix japonica) exhibit decreased oxidative stress and increased muscle fiber diameters after acute heat challenges
Thermal acclimation of fast-growing Japanese Quails (Coturnix japonica) exhibit decreased oxidative stress and increased muscle fiber diameters after acute heat challenges
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DOI：
10.1139/cjz-2017-0273
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发表时间：
2018-10-01
影响因子：
1.4
通讯作者：
Anthony, Nicholas
中科院分区：
文献类型：
--
作者：
Jimenez, Ana Gabriela;Dias, Jennifer;Anthony, Nicholas
许多人预测温度升高的可怕后果;然而，早期生活中的高温可能有助于动物在生命后期的极端热事件中。潜在的生理机制尚未阐明。我们研究了在温暖的温度下发育是否会对成年日本鹌鹑（Coturnix japonica Temminck和Schlegel，1849）产生生理益处，方法是探索两个鹌鹑品系中氧化应激和肌肉结构的变化-一个选择用于控制生长，另一个选择用于快速生长和急性热挑战后。我们使用析因设计对每个品系进行四种处理组合：初始阶段为热应激适应（每隔一天3小时至37 ℃）或无适应，5周后，进行急性热应激挑战（39 ℃下8小时）或无挑战。我们发现，对照鹌鹑有显着较高的柠檬酸合酶活性比快速增长的鹌鹑。速生鹌鹑的羟清除能力高于对照鹌鹑。无论驯化与否，急性热攻击后两条线的过氧化氢清除能力均下降。最后，快速增长的鹌鹑有较大的肌纤维直径比对照鹌鹑，和驯化的鸟类经历了急性热挑战有较大的肌纤维比那些没有经历过热挑战。因此，快速生长的鹌鹑可能从温暖的温度中获得生理上的好处。
Many predict dire consequences of increasing temperatures; however, high temperatures in early life may aid animals during extreme thermal events later in life. The underlying physiological mechanisms have not been elucidated. We examined whether developing in warmer temperatures would physiologically benefit adult Japanese Quails (Coturnix japonica Temminck and Schlegel, 1849) by exploring changes in oxidative stress and muscle structure in two quail lines - one selected for control growth and another for fast growth and after acute heat challenges. We used a factorial design to administer four treatment combinations to each line: an initial period of either heat-stress acclimation (3 h every other day to 37 degrees C) or no acclimation, and after 5 weeks, either an acute heat-stress challenge (8 h at 39 degrees C) or no challenge. We found that control quails had significantly higher citrate synthase activity than fast-growing quails. Fast-growing quails had higher hydroxyl scavenging capacity than control quails. Peroxyl scavenging capacity decreased in both lines after an acute heat challenge, regardless of acclimation. Finally, fast-growing quails had larger muscle fiber diameters than control quails, and acclimated birds that experienced an acute heat challenge had larger muscle fibers than those that did not experience a heat challenge. Thus, fast-growing quails may physiologically benefit from developing in warmer temperatures.