Fasting triggers hypothermia, and ambient temperature modulates its depth in Japanese quail Coturnix japonica
Fasting triggers hypothermia, and ambient temperature modulates its depth in Japanese quail Coturnix japonica
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DOI：
10.1016/j.cbpa.2009.12.020
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发表时间：
2010-05-01
影响因子：
2.3
通讯作者：
Bauchinger, Ulf
中科院分区：
文献类型：
--
作者：
Ben-Hamo, Miriam;Pinshow, Berry;Bauchinger, Ulf
我们测试了三种关于引起日本鹌鹑（Coturnix japonica）同时性体温过低的线索的假设：H-1)环境温度（T-a）单独影响体温过低的发生和深度；H-2)单独禁食会影响低温的发生和深度；H-3 T-a与禁食协同作用，形成低温疗法的使用。8只鹌鹑保持在32.6 +/- 0.2℃的热中性区（TNZ）内，8只保持在12.7 +/- 3.0℃的低临界温度（T-lc）以下，所有鹌鹑在食物剥夺后进入低温状态，即使是保持在TNZ内的鹌鹑。体温（T-b）下降幅度更大（38.36 +/- 0.53℃vs 39.57 +/- 0.57℃），体质量（m(b)）损失更大（21.0 +/- 7.20 g vs 12.8 +/- 2.62 g），低T-a治疗比TNZ治疗节省的能量更大（25.18-45.01% vs 7.98-28.06%）。有趣的是，在低T-a治疗中，低温深度与m(b)损失呈正相关，而在TNZ治疗中则没有。我们的数据支持H-3，即体温调节成本和身体能量储备是鹌鹑进入低温的近似线索。这一结果在T-lc以下并不令人意外。然而，饲养在TNZ的鹌鹑也会对食物剥夺做出反应，进入低温状态，对m(b)的损失没有明显的依赖。因此，除了体温调节成本和身体状况之外，输入必须作为进入低温的线索。因此，我们解决了组织保留可能在使用低温的生理“决定”中发挥的作用。(C) 2010爱思唯尔公司版权所有。
We tested three hypotheses regarding the cues that elicit facultative hypothermia in Japanese quail (Coturnix japonica): H-1) Ambient temperature (T-a), alone, influences the onset and depth of hypothermia; H-2) Fasting, alone, influences the onset and depth of hypothermia; H-3) T-a acts synergistically with fasting to shape the use of hypothermia. Eight quail were maintained within their thermoneutral zone (TNZ) at 32.6 +/- 0.2 degrees C, and eight below their lower critical temperature (T-lc) at 12.7 +/- 3.0 degrees C. All quail entered hypothermia upon food deprivation, even quail kept within their TNZ. Body temperature (T-b) decreased more (38.36 +/- 0.53 degrees C vs. 39.57 +/- 0.57 degrees C), body mass (m(b)) loss was greater (21.0 +/- 7.20 g vs. 12.8 +/- 2.62 g), and the energy saved by using hypothermia was greater (25.18-45.01% vs. 7.98-28.06%) in low the T-a treatment than in TNZ treatment. Interestingly, the depth of hypothermia was positively correlated with m(b) loss in the low T-a treatment, but not in TNZ treatment. Our data support H-3, that both thermoregulatory costs and body energy reserves are proximate cues for entry into hypothermia in quail. This outcome is not surprising below the T-lc. However, the quail kept at their TNZ also responded to food deprivation by entering hypothermia with no apparent dependence on m(b) loss. Therefore inputs, other than thermoregulatory costs and body condition, must serve as cues to enter hypothermia. Consequently, we address the role that tissue sparing may play in the physiological 'decision' to employ hypothermia. (C) 2010 Elsevier Inc. All rights reserved.