JCEM:在肥胖儿童中瘦素可能在骨骼微结构改变中发挥重要作用

2014-11-25 MedSci MedSci原创译

研究背景: 肥胖患者普遍存在骨量的下降和骨折风险的增加。既往尚无针对肥胖儿童中激素水平的改变与骨骼微结构和生物力学方面的关联性研究。 研究目的: 为了明确由肥胖引起的体内激素变化与骨骼肌微结构和生物力学之间的关联。 研究设计: 使用高分辨外周定量计算机辅助扫描系统(HR-pQCT)比较肥胖与健康儿童体内承重与非承重部位骨皮质和骨小梁微结构及生物力学特性的差异。此外还研

研究背景:

肥胖患者普遍存在骨量的下降和骨折风险的增加。既往尚无针对肥胖儿童中激素水平的改变与骨骼微结构和生物力学方面的关联性研究。

研究目的:

为了明确由肥胖引起的体内激素变化与骨骼肌微结构和生物力学之间的关联。

研究设计:

使用高分辨外周定量计算机辅助扫描系统(HR-pQCT)比较肥胖与健康儿童体内承重与非承重部位骨皮质和骨小梁微结构及生物力学特性的差异。此外还研究了瘦素、脂联素、睾酮、雌激素、骨钙蛋白和硬化蛋白等指标与骨骼微结构之间的相关性。

研究场所:

英国高级儿童内分泌中心。

受试者:

性别和青春期均匹配的肥胖和正常儿童。

研究结果:

与对照组相比,肥胖儿童中桡骨骨皮质孔隙度(差异均值-0.01[95%CI:−0.02,−0.004], p=0.003)和骨皮质孔径(差异平均−0.005mm [95% CI:−0.009,−0.001], p=0.011)均有下降。肥胖儿童还表现出胫骨小梁厚度下降(差异平均−0.009mm [95% CI:−0.014,−0.004], p=0.003),同时还有骨小梁数目增多(差异平均0.23mm-1[95% CI:0.08,0.38], p=0.004)。对桡骨的分析显示,脂肪量百分数与骨皮质孔隙度(r=-0.57, p<0.001)和孔隙直径(r=-0.38, p=0.02))呈负相关;而对胫骨的分析提示脂肪量百分数与骨小梁厚度(r=-0.62, p<0.001)和骨小梁冯米斯应力(r=-0.39, p=0.019)呈负相关。而桡骨或胫骨的其他生物力学数据不存在明显差异。肥胖儿童的瘦素水平升高(805.3±440.6 vs 98.1±75.4,p<0.001),并且与桡骨骨皮质孔隙度(r=0.60, 95%CI:[−0.80,−0.30],p<0.001)、桡骨骨皮质孔隙直径(r=0.51, 95%CI[−0.75,−0.16],p=0.002)、胫骨骨小梁厚度(r=0.55, 95%CI: [−0.78,−0.21],p=0.001)以及胫骨骨小梁冯米斯应力(r=-0.39, 95%CI:−0.65,0.04, p=0.02)等指标呈负相关关系。

研究结论:

儿童期的肥胖会改变桡骨和胫骨的微结构。瘦素对这些改变有调控作用。尽管如此,肥胖儿童桡骨和胫骨的生物力学特性将无法在跌倒负重增加的情况下发生适应性变化。这可能解释了肥胖儿童中骨折发生率增加的现象。

原始出处:

P. Dimitri, R. M. Jacques, M. Paggiosi, D. King1, J. Walsh, Z.A. Taylor, A. F. Frangi, N. Bishop, and R. Eastel. Leptin may play a role in bone microstructural alterations in obese children. JCEM, Nov 20, 2014.


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    2015-06-08 ljjj1053

    非常好非常好

    0

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    2015-02-26 smallant2015
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    2015-08-29 achengzhao
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    2014-11-27 sodoo

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