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J Dent Res:IGF-1通过介导EphrinB1活性调节第三期牙本质的形成

2017-05-23 lishiting MedSci原创

Eph受体为受体酪氨酸激酶亚家族成员,它们可以被跨膜配体-ephrins所激活。项目实施者早先的研究表明,ephrinB1-EphB2之间的相互作用可以促进体外培养的牙髓细胞(DPCs)的成牙本质/成骨分化。这篇研究的目的是为了阐明EphrinB1/ephB2系统在体内/体外调节第三期牙本质形成的分子机制。

Eph受体为受体酪氨酸激酶亚家族成员,它们可以被跨膜配体-ephrins所激活。项目实施者早先的研究表明,ephrinB1-EphB2之间的相互作用可以促进体外培养的牙髓细胞(DPCs)的成牙本质/成骨分化。这篇研究的目的是为了阐明EphrinB1/ephB2系统在体内/体外调节第三期牙本质形成的分子机制。

在牙齿发育过程中,ephrinB1和ephB2表达于出生后第4天的前成牙本质细胞和成牙本质细胞内。而ephrinB1又持续表达于成牙本质细胞和成牙本质细胞突起内,直到牙齿完全萌出。另外,在牙齿损伤牙髓未暴露的情况下,损伤后2周的成牙本质细胞突起中可以检测到ephrinB1表达,而EphB2则表达于髓龛的中心,非成牙本质细胞内。在一个牙齿损伤并且牙髓暴露的模型中,ephrinB1强表达于损伤后4周的成牙本质细胞内。向体外培养的人和鼠DPCs中施加氢氧化钙或MTA刺激时,均可以检测到胰岛素样生长激素-1(IGF-1)的表达上调。通过对多种IGF-1受体信号阻断剂的应用发现,阻断Ras/Raf-1/MAPK通路可以抑制ephB2的表达,而阻断PI3K/Akt/mTOR通路可以显著抑制ephrinB1基因的表达。在成牙本质细胞中特异性消融IGF-1受体基因的小鼠中,牙齿损伤后表现出第三期牙本质形成量减少,牙本质矿化密度降低以及损伤后4周的ephrinB1表达下调。

结论:结果表明,IGF-1/ ephrinB1轴在牙齿损伤的早期阶段扮演着十分重要的角色。靶向ephrinB1的牙髓再生疗法具有一定的可能性,但仍需要更多的研究来全面了解和掌握。

原始出处:

Matsumura S1, Quispe-Salcedo A, et al. IGF-1 Mediates EphrinB1 Activation in Regulating Tertiary Dentin Formation. J Dent Res. 2017 May 1:22034517708572. doi: 10.1177/0022034517708572.

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    2018-01-16 qingrejiedu
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    2017-07-06 xxxx1049
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    2017-05-25 天涯183

    非常好的文章,学习了,很受益

    0

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    2017-05-24 飛歌

    学习了很有用

    0

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    2017-05-24 lou.minghong

    学习

    0

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    2017-05-23 土拨鼠星人

    IGF-1/ephrinB1轴在牙齿损伤的早期阶段扮演着十分重要的角色。靶向ephrinB1的牙髓再生疗法具有一定的可能性,但仍需要更多的研究来全面了解和掌握。

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    2017-05-23 有备才能无患

    IGF-1/ephrinB1轴在牙齿损伤的早期阶段扮演着十分重要的角色

    0

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