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J Dent Res:鞘磷脂磷酸二酯酶3可以增强牙周膜细胞的分化

2017-04-13 MedSci MedSci原创

鞘磷脂磷酸二酯酶3(Smpd3)可以编码无作用的鞘磷脂酶2(nSMase2),它是调节骨骼发育、成牙本质细胞分化和牙槽骨发生的核心分子。然而,nSMase2对牙周膜(PDL)细胞的分化作用还未可知。

鞘磷脂磷酸二酯酶3(Smpd3)可以编码无作用的鞘磷脂酶2(nSMase2),它是调节骨骼发育、成牙本质细胞分化和牙槽骨发生的核心分子。然而,nSMase2对牙周膜(PDL)细胞的分化作用还未可知。

在这篇研究中,作者探讨了Smpd3对人PDL(HPDL)的细胞分化作用的影响。结果发现,Smpd3可以上调HPDL细胞中钙化相关基因mRNA的表达,如:碱性磷酸酶(ALP)、I型胶原、骨桥蛋白、Osterix(Osx)和runt相关转录因子(Runx)-2。然而,向细胞施加nSMase2抑制剂GW4869刺激,可以明显减弱HPDL细胞中ALP、I型胶原和骨桥蛋白mRNA表达。结果表明,Smpd3可以促进HPDL的细胞分化。

随后,作者通过外源序列测序来检测日本人群中患侵袭性牙周炎(AgP)患者的Smpd3遗传变异情况。在44个无血缘关系的患者中,作者在Smpd3基因上确认了一个单核苷酸多态性(SNP),rs145616324,并作为假定的日本人群中患AgP的遗传变异体。然而,在Smpd3中失活SNP并没有增强鞘磷脂酶活性,又或是ALP、I型胶原、骨桥蛋白、Osx和Runx2的mRNA表达。结果表明,SNP对HPDL的细胞分化并没有影响。

结论:这篇研究表明,Smpd3对于维持PDL组织的内稳定起到决定性作用。

原始出处

Miyauchi S, Kitagaki J, et al. Sphingomyelin Phosphodiesterase 3 Enhances Cytodifferentiation of Periodontal Ligament Cells. J Dent Res. 2017 Mar;96(3):339-346. doi: 10.1177/0022034516677938.

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    2018-01-12 xqptu
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    2017-12-03 kcb069
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