JAMDA:IGF-1和IGFBP3可以影响中国老人血液循环中IGF-1水平和ASMI程度

2015-05-17 MedSci MedSci原创

背景:先前的研究表明胰岛素样生长因子1(IGF-1)的多形态性及其结合蛋白3(IGFBP3)的相关基因可以影响循环中IGF-1的水平。而且,血清IGF-1水平与人体肌肉尺寸相关。目标:这项研究旨在探究台湾大都市老年人体内IGF-1多态性、IGFBP3和IGFBP5基因对四肢骨骼肌肉物质量指数的影响和作用。设计: 该实验是以社区为基础的横断面研究。我们随机抽取472名老年人完成了双能骨密度能量检查和

背景:
先前的研究表明胰岛素样生长因子1(IGF-1)的多形态性及其结合蛋白3(IGFBP3)的相关基因可以影响循环中IGF-1的水平。而且,血清IGF-1水平与人体肌肉尺寸相关。

目标:
这项研究旨在探究台湾大都市老年人体内IGF-1多态性、IGFBP3和IGFBP5基因对四肢骨骼肌肉物质量指数(Appendicular Skeletal Muscle Mass index,ASMI)的影响和作用。

设计:
该实验是以社区为基础的横断面研究。我们随机抽取472名老年人完成了双能骨密度能量检查和基因型分析,并且从台中市老年人健康研究中心(TCHS-E)获取了他们的血清IGF-1水平。低四肢骨骼肌肉指数被定义为:在TCHS研究中低于青年人平均四肢骨骼肌肉指数2个标准差。处在该程度的老人有471名。我们通过使用选择基因型分析对IGF1的7个多形态、IGFBP3和IGFBP5进行分析探讨。统计分析使用了χ2检验、t检验和多因素逻辑回归分析。

结果:
在参与人群中,年龄在70岁以下、71岁-75岁、75岁以上的老年人具有低四肢骨骼肌肉指数的发生率分别为 7.1%、8.8%和23.0%。研究发现,低ASMI的患者组血清IGF-1水平明显低于正常ASMI患者组,而且IGFBP3附近的SNP位点rs2854744与低ASMI高度相关;并且,IGF1的SNP位点rs6214能够明显影响血清IGF-1水平;不仅如此,该研究对rs6214和rs2854744的共同作用进行了分析。在对参与人员的年龄,性别,吸烟,运动,患高脂血症的比例和老人白蛋白水平调整之后,研究发现,对AC或CC基因型有rs6214 和GG基因型有rs2854744的老人而言,患低ASMI几率是AA基因型老人的3.18倍(95% CI为1.02–9.89)。

结论:
IGF1的rs6214和IGFBP3附近的rs2854744可能对台中市大都市老人的ASMI的高低起到重要的作用。

原始出处:

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    2016-03-08 wetgdt
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    2016-04-12 qingrejiedu
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    2015-08-03 xxxx1049
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    2015-05-19 zhty5337