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中华口腔医学研究杂志(电子版) ›› 2011, Vol. 5 ›› Issue (05) : 455 -462. doi: 10.3877/cma.j.issn.1674-1366.2011.05.001

基础研究

骨形成蛋白4 对人牙髓细胞去分化基因表达的调控作用
刘路1, 韦曦1, 凌均棨1,(), 张芳1, 吴莉萍1   
  1. 1.510055 广州,中山大学光华口腔医学院·附属口腔医院·口腔医学研究所
  • 收稿日期:2011-07-21 出版日期:2011-10-01
  • 通信作者: 凌均棨
  • 基金资助:
    国家自然科学基金(81070830)广东省自然科学基金(9151008901000199)广东省医学科研基金(2009223)

The modulatory mechanism of bone morphogenetic protein 4 on the expression of reprogramming markers in human dental pulp cells

Lu LIU1, Xi WEI1, Jun-qi LING1,(), Fang ZHANG1, Li-ping WU1   

  1. 1.Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou 510055, China
  • Received:2011-07-21 Published:2011-10-01
  • Corresponding author: Jun-qi LING
引用本文:

刘路, 韦曦, 凌均棨, 张芳, 吴莉萍. 骨形成蛋白4 对人牙髓细胞去分化基因表达的调控作用[J/OL]. 中华口腔医学研究杂志(电子版), 2011, 5(05): 455-462.

Lu LIU, Xi WEI, Jun-qi LING, Fang ZHANG, Li-ping WU. The modulatory mechanism of bone morphogenetic protein 4 on the expression of reprogramming markers in human dental pulp cells[J/OL]. Chinese Journal of Stomatological Research(Electronic Edition), 2011, 5(05): 455-462.

目的

研究外源性骨形成蛋白4(BMP-4)对体外连续传代培养人牙髓细胞(DPCs)生长和去分化基因表达的影响,探讨BMP-4 对DPCs 体外传代培养过程中细胞未分化性能的调控作用。

方法

重组人骨形成蛋白(rhBMP-4)诱导组和对照组体外培养4 周的人牙髓组织中的细胞进行细胞计数;取P2 和P7 代rhBMP-4 诱导组和对照组DPCs,免疫荧光染色和实时荧光定量聚合酶链反应检测Oct-4、Sox-2、c-Myc 表达情况,统计学分析。

结果

体外培养4 周的人牙髓组织经rhBMP-4 诱导后,DPCs 数量显著高于对照组(P<0.05)。 免疫荧光示Oct-4、Sox-2、c-Myc 在P2 代rhBMP-4 诱导组和对照组DPCs 均为细胞核表达, 在P7 代诱导组DPCs保持细胞核表达,而在P7 代对照组DPCs 表现为细胞浆表达。 实时荧光定量聚合酶链反应显示Oct-4、Sox-2、c-Myc 在P2 代诱导组和对照组DPCs 表达差异无统计学意义(P>0.05),而在P7 代诱导组DPCs 表达显著高于对照组(P<0.05)。

结论

BMP-4 可促进DPCs 生长,维持传代后期去分化基因Oct-4、Sox-2、c-Myc 的表达。

Objective

The purpose of this study was to investigate the modulatory role of exogenous bone morphogenetic protein 4 (BMP-4) on the growth and the expression of reprogramming markers in human dental pulp cells with long term in vitro culture.

Methods

Cell counting was applied to the DPCs growing our from human dental pulp tissue with 4 w in vitro culture, either stimulated with recombinant human BMP-4(rhBMP-4) or without. Immunofluorescent staining and quantitative Realtime PCR were applied to investigate the expression of Oct-4, Sox-2 and c-Myc expression on DPCs at passage 2 and 7 of rhBMP-4 induced and control group.

Results

The number of out growing DPCs after 4 w in vitro cultured with rhBMP-4 was statistically higher than the one from control group (P<0.05). Oct-4, Sox-2 and c-Myc showed a similar expressing pattern in DPCs from the rhBMP-4 induced and control group at passage 2, which showed their positive nucleus expression. Whereas they lost nucleus location and showed weak cytoplasm expression in DPCs at passage 7 in control group, albeit remained necleus location in DPCs at passage 7 from the rhBMP-4 induced group. The mRNA expression of Oct-4, Sox-2 and c-Myc was similar in DPCs from both rhBMP-4 induced and control group (P>0.05), whereas their mRNA expression were all sinificantly higher in DPCs from rhBMP-4 induced group than the control group(P<0.05).

Conclusions

BMP-4 can stimulate the growth of DPCs, and enhance the expression of Oct-4, Sox-2 and c-Myc in DPCs with long term in vitro culture, implying BMP-4 may regulate the undifferentiated capacity of DPCs with in vitro culture.

表1 RT-PCR 引物序列
图1 对照组和rhBMP-4 诱导组体外培养的各代DPCs 细胞计数 rhBMP-4 诱导组体外培养的各代DPCs 细胞数均显著高于对照组各代DPCs 细胞数(aP<0.05)
图2 Oct-4、Sox-2 和c-Myc 在对照组和rhBMP-4 诱导组DPCs 的免疫荧光表达 免疫细胞荧光染色示Oct-4(A、B)、Sox-2(E、F)和c-Myc(I、J)在P2 代对照组(A、E、I)和rhBMP-4 诱导组(B、F、J)DPCs 呈现相似的表达变化趋势,均为细胞核强表达,在胞浆弱表达,绿色荧光为抗体染色( × 200);Oct-4(C、D)、Sox-2(G、H)和c-Myc(K、L)在P7 代rhBMP-4 诱导组(D、H、L)DPCs 保持细胞核表达,而在P7 代对照组(C、G、K)DPCs 主要为胞浆表达,细胞核表达基本丧失( × 400)
图3 Oct-4 mRNA 在对照组和rhBMP-4 诱导组DPCs 的表达 RT-PCR 检测显示,Oct-4 mRNA 水平在第2 代对照组和rhBMP-4 诱导组DPCs 差异无统计学意义(P>0.05),而在第7 代rhBMP-4 诱导组DPCs 的mRNA 水平显著高于第7 代对照组DPCs,差异有统计学意义(aP<0.05)
图4 Sox-2 mRNA 在对照组和rhBMP-4 诱导组DPCs 的表达 RT-PCR 检测显示,Sox-2 mRNA 水平在第2 代对照组和rhBMP-4 诱导组DPCs 差异无统计学意义(P>0.05),而在第7 代rhBMP-4 诱导组DPCs 的mRNA 水平显著高于第7 代对照组DPCs,差异有统计学意义(aP<0.05)
图5 c-Myc mRNA 在对照组和rhBMP-4 诱导组DPCs 的表达 RT-PCR 检测显示,c-Myc mRNA 水平在第2 代对照组和rhBMP-4 诱导组DPCs 差异无统计学意义(P>0.05),而在第7 代rhBMP-4 诱导组DPCs 的mRNA 水平显著高于第7 代对照组DPCs,差异有统计学意义(aP<0.05)
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