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机构地区:[1]天津医科大学口腔医院牙体牙髓科,300070 [2]天津医科大学口腔医院修复科,300070
出 处:《中华口腔医学杂志》2013年第9期535-538,共4页Chinese Journal of Stomatology
摘 要:目的探讨釉基质蛋白(emdogain,EMD)对人牙髓细胞中骨涎蛋白基因mRNA和蛋白水平的影响,以期发现EMD诱导矿化的机制。方法从2011年5至7月天津医科大学口腔医院口腔颌面外科门诊因正畸需要拔除的15颗健康双尖牙中提取人牙髓组织,并传代培养人牙髓细胞,分成不同质量浓度(25、50、100和250mg/L)EMD组和空白对照组,在培养1、3、5、7d提取总RNA,通过实时定量PCR法检测EMD对骨涎蛋白mRNA表达水平的影响;通过蛋白质印迹法检测EMD刺激人牙髓细胞1、3、5、7d骨涎蛋白在蛋白水平的表达变化。结果实时定量PCR结果显示,在1、3、5、7d,25、50、100和250mg/LEMD组的骨涎蛋白表达(7d时分别为1.79±0.03、2.03±0.10、2.67±0.08、2.94±0.07)与空白对照组(7d:1.06±0.11)相比差异均有统计学意义(P〈0.001);相同质量浓度(250mg/L)的EMD在不同时间点(1、3、5、7d)刺激细胞,骨涎蛋白的表达(2.30±0.06、2.65±0.05、2.76±0.05、2.94±0.07)各组间相比差异均有统计学意义(P〈0.05);蛋白质印迹法结果显示,250mg/LEMD可以促进人牙髓细胞骨涎蛋白表达增加,随着刺激时间的延长,骨涎蛋白表达明显增强。结论EMD能诱导人牙髓细胞中骨涎蛋白基因mRNA和蛋白水平的增长。Objective To analyze the effects of emdogain (EMD) on the expression of the bone sialoprotein(BSP) gene in human dental pulp cells and to elucidate the molecular mechanism of BSP gene regulated by EMD. Methods Human dental pulp was harvested from premolars freshly extracted for orthodontic purpose and cultured. Cells were divided into different concentrations (25,50,100 and 250 mg/L) of EMD and control groups (Dulbecco' s modified Eagle's medium). Total RNA of cells was extracted. Human BSP mRNA levels was detected with the real-time PCR. Regulations of EMD on human BSP protein levels were detected with Western blotting. Results In the real-time PCR, at the same time point, there were significant differences on BSP mRNA levels between 25,50,100 and 250 mg/L EMD groups (7 d: 1.79 ±0.03,2.03 ±0.10,2.67 ±0.08,2.94 ±0.07) and control group(7 d: 1.06 ±0.11) (P 〈0. 001 ) ; at the different time point( 1,3,5 and 7 d) ,the same dose(250 mg/L) of EMD stimulated human dental pulp cells,BSP mRNA (2. 30 ±0. 06,2. 65 ±0. 05,2. 76 ±0. 05,2. 94 ±0. 07) was increased (P 〈 0. 05 ) . Treatment of human dental pulp cells with EMD (250 mg/L ) increased the protein levels. Conclusions EMD increases BSP mRNA and protein levels in human dental pulp cells.
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