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Par-4基因沉默对人骨髓间充质干细胞中Smac基因表达和半胱氨酸蛋白水解酶3酶活性的影响及其抗凋亡作用 被引量:4

Effects of Par-4 gene silencing induced by siRNA on the expression of Smac gene, activity of caspase- 3, and apoptosis of human bone marrow mesenchymal stem cells
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摘要 目的研究Par-4基因沉默对人骨髓间充质干细胞(hBMSC)中Smac基因表达和半胱氨酸蛋白水解酶(Caspase)3酶活性的影响及其抗凋亡作用。方法原代培养hBMSC。谷氨酸诱导hBMSC凋亡。设计和合成两对针对Par-4基因mRNA的小RNA干扰(siRNA)序列(Par-4-SiRNA-1、2),构建真核细胞表达载体,用脂质体介导转染hBMSC,利用G418筛选稳定表达细胞株。实时荧光定量PCR法检测Par-4 mRNA表达水平。流式细胞术测定细胞凋亡百分率。Western印迹测定Smac蛋白表达量。比色法测定Caspase-3酶的活性。结果设计的Par-4-SiRNA-1、2可显著诱导hBMSC中Par-4基因沉默,Par-4 mRNA水平分别被降低88%、67%,谷氨酸诱导hBMSC凋亡,凋亡百分率为(58.9±8.9)%。Par-4-SiRNA-1可显著拈抗谷氨酸的诱导凋亡作用,凋亡百分率降为(37.2±6.3)%(F=58.26,P〈0.01)。Par-4-SiRNA-1对谷氨酸诱导的hBMSC中Smac蛋白表达上凋(P〈0.01)和Caspase-3酶活性上调(P〈0.01)有显著的抑制作用(P〈0.01)。结论Par-4基因沉默能拈抗谷氨酸对hBMSC凋亡的诱导作用。其机制可能与Smac基因表达和Caspase-3酶活性被抑制有关。 Objective To investigate the effects of Par-4 gene silencing induced by siRNA on the expression of Smac gene, activity of caspase-3, and apoptosis of human bone marrow mesenchymal stem cells (hBMSCs). Methods Bone marrow was obtained from a healthy young man and hBMSCs were isolated and cultured. Two siRNAs (Par-4-siRNA-1 and -2 ) targeting Par-4 gene were chemically synthesized. Eukaryocytic expression vectors containing these Par-4 siRNA sequences were established and transfected into the hBMSCs. The hBMSCs were divided into 4 groups: non-transfected hBMSCs (normal control group), blank Pae-4 plasmid transfected hBMSCs (Par-4 control group), Par-4-siRNA-1 transfected hBMSCs, and Par-4-siRNA-2 transfected hBMSCs. The expression of Par-4 mRNA was detected by real-time PCR. Another hBMSCs were inoculated in DMEM and divided into 4 groups: non-transfected normal hBMSCs, glutamate (an apoptosis inducer) + non-transfected hBMSC group, glutamine + Par-4-siRNA-1 hBMSC group, and glutamate + Par4-SiRNS-2 hBMSC group. Flow cytometry was used to detect the apoptotic rate. The relative activity of caspase-3 was determined by colorimetric assay. Western blotting was used to detect the Smac protein expression. Results The relative mRNA expression levels of Par-4 gene of the Par-4-siRNA-1 hBMSCs, Par-4 SIENA-2 hBMSCs, and Par-4 control hBMSCs were 0. 12 ± 0. 03, 0.33 ± 0.09, and 0.97 ±0.02 respectively, decreased by 88%, 67%, and 3% respectively compared with that of the normal control. The percentages of apoptotic cells of the glutamate + Par-4-siRNA-1 hBMSCs was ( 37.2 ± 6.3 ) %, significantly lower than that of the glutamate + non-transfected hBMSC group [ (58.9 ± 8.9) % , F = 58.26, P 〈 0.01 ). The Smac protein expression level of the glutamate + non-transfected hBMSC group was significantly higher than that of the normal control group ( P 〈0.01 ) ; however, the Smac protein expression level of the Par-4-siRNA-1 hBMSC group was significantly lower than that of the glutamate + non-transfected hBMSC group ( P 〈 0.01 ). The caspase-3 activity of the glutamate + Par-4-siRNA-1 hBMSC group was significantly lower than that of the glutamate + non-transfected BMSC group ( P 〈 0. 01 ). Conclusion Par-4-siRNA-1 inhibits markedly the apoptosis of the hBMSCs induced by glutamate. Par-4 gene silencing induced by siRNA inhibits the apoptosis of hBMSCs. The mechanism of the inhibition may be closely related to suppression of the up-regulation of Smac gene expression and caspase-3 activity.
出处 《中华医学杂志》 CAS CSCD 北大核心 2008年第6期411-415,共5页 National Medical Journal of China
基金 国家自然科学基金资助项目(30570863) 江苏省卫生厅医学科技发展重大基金资助项目(K200504)
关键词 RNA 干细胞 脱噬作用 基因 PAR-4 RNA Stem cells Apotosis Gene,Par-4
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参考文献12

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