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首页> 外文期刊>Zoological Science >Lowering Temperature Is the Trigger for Glycogen Build-up and Winter Fasting in Crucian Carp (Carassius carassius)
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Lowering Temperature Is the Trigger for Glycogen Build-up and Winter Fasting in Crucian Carp (Carassius carassius)

机译：降低温度是Cru鱼（Carassius carassius）糖原积累和冬季禁食的诱因

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摘要

Seasonal changes in physiology of vertebrate animals are triggered by environmental cues including temperature, day-length and oxygen availability. Crucian carp (Carassius carassius) tolerate prolonged anoxia in winter by using several physiological adaptations that are seasonally activated. This study examines which environmental cues are required to trigger physiological adjustments for winter dormancy in crucian carp. To this end, crucian carp were exposed to changing environmental factors under laboratory conditions: effects of declining water temperature, shortening dayl-ength and reduced oxygen availability, separately and in different combinations, were examined on glycogen content and enzyme activities involved in feeding (alkaline phosphatase, AP) and glycogen metabolism (glycogen synthase, GyS; glycogen phosphorylase, GP). Lowering temperature induced a fall in activity of AP and a rise in glycogen content and rate of glycogen synthesis. Relative mass of the liver, and glycogen concentration of liver, muscle and brain increased with lowering temperature. Similarly activity of GyS in muscle and expression of GyS transcripts in brain were up-regulated by lowering temperature. Shortened day-length and oxygen availability had practically no effects on measured variables. We conclude that lowering temperature is the main trigger in preparation for winter anoxia in crucian carp.
机译：脊椎动物的生理季节性变化是由环境线索触发的，包括温度，日长和氧气供应。 winter鱼（Carassius carassius）通过使用季节性激活的几种生理适应性物质，可以忍受冬季长时间的缺氧。这项研究调查了哪些环境提示才能触发physiological鱼冬季休眠的生理调节。为此，,鱼在实验室条件下暴露于变化的环境因素：分别和以不同的组合，对水温下降，日龄缩短和氧气供应减少的影响进行了研究，涉及饲料中的糖原含量和酶活性（碱性）磷酸酶，AP）和糖原代谢（糖原合酶，GyS;糖原磷酸化酶，GP）。降低温度导致AP活性下降，糖原含量和糖原合成速率增加。肝脏的相对质量以及肝脏，肌肉和大脑的糖原浓度随温度降低而增加。降低温度可以上调肌肉中GyS的活性和大脑中GyS转录物的表达。日长和氧气供应的缩短对测量变量几乎没有影响。我们得出结论，降低温度是preparation鱼冬季缺氧的主要诱因。

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