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Am J Pathol:PPARγ敲减损害骨形态发生蛋白-2诱导的临界尺寸骨缺损修复

2019-01-09 MedSci MedSci原创

据报道,骨形态发生蛋白-2(BMP2)的临床剂量(1.5 mg / mL)可引起明显的不良反应,包括囊样脂肪浸润的异常骨形成。这些并发症的发生是由于脂肪生成增加,成骨生成减少,通过BMP2介导的脂肪生成的主调节基因,过氧化物酶体增殖物激活受体γ(PPARγ)的增加。既往研究已经提出在骨生成期间抑制PPARγ以促使骨髓基质/干细胞(BMSC)向成骨细胞而非脂肪形成细胞系分化。我们证明在同时施用BMP

据报道,骨形态发生蛋白-2(BMP2)的临床剂量(1.5 mg / mL)可引起明显的不良反应,包括囊样脂肪浸润的异常骨形成。这些并发症的发生是由于脂肪生成增加,成骨生成减少,通过BMP2介导的脂肪生成的主调节基因,过氧化物酶体增殖物激活受体γ(PPARγ)的增加。既往研究已经提出在骨生成期间抑制PPARγ以促使骨髓基质/干细胞(BMSC)向成骨细胞而非脂肪形成细胞系分化。

我们证明在同时施用BMP2的同时敲低PPARγ可以减少脂肪形成,但发现它还损害BMP2诱导的骨生成并导致小鼠股骨节段缺损模型中的骨不愈合。另外,使用小鼠骨髓基质细胞系M2-10B4和小鼠原代骨髓基质细胞的体外研究证实PPARγ敲低抑制BMP2诱导的脂肪形成;减弱BMP2诱导的细胞增殖,迁移,侵袭和成骨;并升高BMP2诱导的细胞凋亡。重要的是,BMP受体2和1B的表达也因BMP2和PPARγ敲低处理显著抑制。

综上所述,这些发现表明PPARγ对骨修复过程中BMP2介导的骨生成至关重要。因此,使用PPARγ抑制解偶联BMP2介导的成骨和脂肪形成或无法抑制BMP2的不良反应。

原始出处:

Wang C, Tanjaya J, et al., PPARγ Knockdown Impairs Bone Morphogenetic Protein-2 (BMP2)-Induced Critical-Size Bone Defect Repair. Am J Pathol. 2018 Dec 26. pii: S0002-9440(18)30333-X. doi: 10.1016/j.ajpath.2018.11.019. 

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    2019-02-26 yb6560
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    2019-01-11 lfcmxl
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