J Endod:血管内皮生长因子与骨形成蛋白2对人牙髓干细胞成骨/成牙本质分化的并用效果研究

2017-05-04 lishiting MedSci原创

这篇研究的目的是为了评估协同并用血管内皮生长因子(VEGF)与骨形成蛋白2(BMP-2)是否可以增强体外培养的人牙髓干细胞(DPSCs)的成骨/成牙本质分化。

这篇研究的目的是为了评估协同并用血管内皮生长因子(VEGF)与骨形成蛋白2(BMP-2)是否可以增强体外培养的人牙髓干细胞(DPSCs)的成骨/成牙本质分化。

成骨/成牙本质分化培养基(OM)或生长培养基体外培养DPSCs,并施加不同浓度的VEGF和/或BMP-2刺激21天。茜素红染色(ARS)观察细胞矿化形成情况。不同浓度的VEGF和BMP-2协同并用,向DPSCs施加刺激21天。实验分组:组1:OM;组2:OM+VEGF;组3:OM+BMP-2;组4:OM+VEGF+BMP-2(亚组:组4a:VEGF刺激最初的7天,组4b:BMP-2刺激最后的14天,组4c:VEGF+BMP-2刺激21天)。随后,细胞进行定量ARS分析,或收集细胞进行定量聚合酶链式反应,观察核心结合因子α1(CBFA1)、碱性磷酸酶(ALP)和牙本质基质蛋白1(DMP-1)的表达改变。

结果显示,在未进行OM培养下,VEGF和/或BMP-2均无法诱导DPSCs的矿化形成。与OM相比,OM+VEGF可以诱导更多的矿化形成(P < .05),而不是OM+BMP-2。在共同施加刺激的分组中,OM+VEGF组和组4a的诱导矿化能力最强,要明显优于OM组或其他组(P < .05)。定量聚合酶链式反应结果显示,组2、3和4a的CBFA1、ALP和DMP-1表达水平要明显高于组4b和4c(P < .05)。而ALP的表达水平只有组4a明显高于OM组(P < .05)。另外,3种基因的表达在组2和组3之间未见明显差异(P > .05)。

结论:在矿化诱导早期施加VEGF刺激能够增强DPSCs的成骨/成牙本质分化,而不是持续向DPSCs施加VEGF和BMP-2的共同刺激。

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    2017-12-06 jxrzshh
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    2017-05-06 zhaojie88
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    2017-05-04 ayl3691

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    2017-05-04 三生有幸9135

    学习一下谢谢分享

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Nature:P53突变,干细胞疗法背后可能的癌变风险

由于P53蛋白是限制细胞增殖的关键蛋白,缺失P53蛋白会导致细胞恶性增殖,最终导致癌变。研究人员因此提出警示,在未来选择干细胞疗法的时候,一定要充分的调查干细胞的基因突变,以防止可能的癌变发生。

Circ Res:心肌再生的研究进展

目前,对于不同源性心肌干细胞群之间的相对作用、协同作用仍不清楚。关于心力衰竭的治疗相关的最佳细胞群仍存在争议,这一争议促使将多种干细胞群从单一的心肌组织样本中分离出来成为了现实,为实现心肌的再生开辟新的见解。该研究的目的是,建立一个可靠的心脏干细胞分离和培养方案,从一份人的心脏活检组织中连续培养,产生三种不同的干细胞群。研究者采用左心室辅助装置(LVAD)植入时常规切除的心脏样本,来分离三个内生的