冷适应对大鼠棕色脂肪组织线粒体内膜解偶联蛋白与嘌呤核苷三磷酸结合的影响

Effect of cold acclimation on GTP binding to uncoupling protein in mitochondria inner membrane of rat brown fat

目的 :探讨冷适应对大鼠棕色脂肪线粒体内膜解偶联蛋白 (UCP)活性与含量的影响。方法 :用 [3 H]标记的鸟嘌呤核苷三磷酸 (GTP)与解偶联蛋白相结合 ,用液体闪烁仪测定其放射性活性 ,经Scatchardplot分析得出两者结合的解离常数 (Kd)和最大结合量 (Bmax)。结果 :冷适应能使棕色脂肪增加 ;冷适应组Bmax显著高于对照组 ,Kd值显著低于对照组。结论 :冷适应不仅能使棕色脂肪线粒体内膜UCP含量增加 ,而且能使其活性增加。

AIM: To evaluate the effect of cold acclimation on activity and concentration of UCP in mitochondria inner membrane of rat brown fat. METHODS: Using -labeled GTP binded UCP in mitochondria, radioactivity was measured by liquid aglimmer instrument, the dissociation constand(Kd) and maximal binding(Bmax) were determined by Scatchard plot. RESULTS: In cold acclimation pretreated rats, brown fat weight increased, Bmax increased 1.9-fold,Kd decreased 1.4-fold compared with control. CONCLUSION: Cold acclimation not only increase concentration of UCP in mitochondria inner membrane of rat brown fat,but also increase its activity.