Bone Res:AFF1和AFF4差异调节人间充质干细胞的成骨分化

2017-10-09 MedSci MedSci原创

AFF1和AFF4属于AFF(AF4/FMR2)蛋白家族,作为支架蛋白,在超伸长复合物(SEC)中连接两种不同转录延伸因子——正伸长因子b(P-TEFb)和ELL1/2。 AFF1和AFF4都是通过伸长和染色质重塑调控基因转录。然而,它们在间充质干细胞(MSC)成骨分化中的功能是未知的。在本研究中,研究人员发现,小干扰RNA(siRNA)介导的人类MSCs中AFF1的删除导致碱性磷酸酶(ALP)活

AFF1和AFF4属于AFF(AF4/FMR2)蛋白家族,作为支架蛋白,在超伸长复合物(SEC)中连接两种不同转录延伸因子——正伸长因子b(P-TEFb)和ELL1/2。 AFF1和AFF4都是通过伸长和染色质重塑调控基因转录。然而,它们在间充质干细胞(MSC)成骨分化中的功能是未知的。

在本研究中,研究人员发现,小干扰RNA(siRNA)介导的人类MSCs中AFF1的删除导致碱性磷酸酶(ALP)活性增加,增强矿化,并上调成骨相关基因的表达。相反,消除AFF4则会明显抑制MSCs的成骨潜能。此外,研究人员确认AFF1和AFF4的过表达差异影响体外成骨分化和体内MSCs介导的骨形成。具体来说,研究人员发现AFF1通过结合其启动子区域来调节DKK1的表达。HA-AFF1过表达的MSCs中,DKK1的删除消除了成骨分化的损伤。此外,研究发现ID1的启动子区域AFF4富集。敲除AFF4影响BMP2处理诱导的BRE荧光素酶活性、SP7的表达和ALP的活性。

总之,该研究结果表明,AFF1和AFF4差异调节人类MSCs的成骨分化。

原始出处:


Chen-chen Zhou, Qiu-chan Xiong, et al., AFF1 and AFF4 differentially regulate the osteogenic differentiation of human MSCs. Bone Res. 2017; 5: 17044. Published online 2017 Sep 26. doi: 10.1038/boneres.2017.44

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    2018-06-19 HinsMax
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    2017-10-13 apoenzyme
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    2017-10-11 zhaojie88