饥饿对不同内脏脂肪含量大鼠血清脂联素分泌的影响
The effect of fasting on serum adiponectin secretion in different visceral-fat rats
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摘要: 目的: 建立不同内脏脂肪含量的大鼠模型,通过观测不同饥饿时段大鼠血清脂联素分泌的变化,探讨脂联素在能量代谢中所发挥的作用。方法: 通过高脂和极低热量饮食建立高脂及减体质量大鼠模型。将大鼠分为正常饲养组、高脂饲养组、减体质量组。使用16排螺旋CT全扫,计算大鼠内脏脂肪含量。将所有大鼠以内脏脂肪含量再次分组。采用放射免疫法测定血清脂联素水平。结果: 大鼠血清脂联素水平与内脏脂肪含量呈负相关关系(P<0.01),脂联素分泌随着饥饿时间的延长而下调,在饥饿72 h后开始明显。内脏脂肪含量≥9%的极度肥胖大鼠,在饥饿24 h血清脂联素分泌量较非饥饿状态小幅上升,但到饥饿120 h后,血清脂联素的分泌量较非饥饿状态下降(P<0.05)。结论: 脂联素的分泌调节与内脏脂肪含量有密切的关系,脂联素可能也是一种重要的传递机体能量平衡的脂肪信号。Abstract: Objective: To study the role of adiponectin in energy metablism through observing serum adiponectin secretion during different fasting periods in different visceral-fat rat models.Methods: The obese and weight-loss rat models were established through high fat diet and lowest energy diet,visceral-fat volume was tested with Spiral-CT.Then the rats were divided into normal,lean and obese groups according to visceral-fat volume.Serum adiponectin levels were analyzed by radioimmunoassay during different fasting periods.Results: There was negative correlation between serum adiponectin concentration and visceral-fat volume(P<0.01).The secretion of serum adiponectin was decreased with fasting time,obviously decreased after fasting 72 hours.However,in obese rat which the visceral-fat volume was exceeded 9%,the secretion of serum adiponectin was increased in fasting 24 hours,and then decreased after fasting 120 hours(P<0.05).Conclusions: There was the close relationship between adiponectin secretion and visceral-fat volume.Adiponectin may also be an important signal in energy homeostasis.
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Key words:
- fasting /
- adiponectin /
- energy homeostasis /
- visceral-fat /
- rat
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