AIM: To understand which and how different miRNAs are implicated in the process of hepatic stellate cell (HSC) activation. METHODS: We used microarrays to examine the differential expression of miRNAs during in vitro ...AIM: To understand which and how different miRNAs are implicated in the process of hepatic stellate cell (HSC) activation. METHODS: We used microarrays to examine the differential expression of miRNAs during in vitro activation of primary HSCs (pHSCs). The transcriptome changes upon stable transfection of rno-miR-146a into an HSC cell line were studied using cDNA microarrays. Selected differentially regulated miRNAs were investigated by quantitative real-time polymerase chain reaction during in vivo HSC activation. The effect of miRNA mimics and inhibitor on the in vitro activation of pHSCs was also evaluated.RESULTS: We found that 16 miRNAs were upregulated and 26 were downregulated significantly in 10-d in vitro activated pHSCs in comparison to quiescent pHSCs. Overexpression of rno-miR-146a was characterized by marked upregulation of tissue inhibitor of metalloproteinase-3, which is implicated in the regulation of tumor necrosis factor-α activity. Differences in the regulation of selected miRNAs were observed comparing in vitro and in vivo HSC activation. Treatment with miR-26a and 29a mimics, and miR-214 inhibitor during in vitro activation of pHSCs induced significant downregulation of collagen type Ⅰ transcription. CONCLUSION: Our results emphasize the different regulation of miRNAs in in vitro and in vivo activated pHSCs. We also showed that miR-26a, 29a and 214 are involved in the regulation of collagen type I mRNA.展开更多
目的观察miRNA-146a对血管平滑肌细胞增殖的作用并研究其机制。方法原代培养大鼠血管平滑肌细胞,分成抑制组、对照组和正常组,采用脂质体2000分别转染miRNA-146a抑制剂(50nmol/L)、错义链(50nmol/L)、PBS,使用real time PCR方法测定转染...目的观察miRNA-146a对血管平滑肌细胞增殖的作用并研究其机制。方法原代培养大鼠血管平滑肌细胞,分成抑制组、对照组和正常组,采用脂质体2000分别转染miRNA-146a抑制剂(50nmol/L)、错义链(50nmol/L)、PBS,使用real time PCR方法测定转染后miRNA-146a水平,CCK8法检测转染后血管平滑肌细胞增殖,transwell法检测转染后血管平滑肌细胞迁移程度,western blot检测转染后血管平滑肌细胞核因子κBp65(NF-κBp65)与增殖细胞核抗原蛋白(PCNA)水平。结果转染48 h后,抑制组血管平滑肌细胞的miRNA-146a水平明显低于对照组和正常组(P<0.01);其增殖和迁移比例显著低于对照组和正常组组(P<0.01);其NF-κBp65、PCNA蛋白表达水平降低(P<0.05)。结论 miRNA-146a可以促进血管平滑肌细胞的增殖和迁移,其机制与增加NF-κBp65表达相关。展开更多
基金Supported by Institute of Bioengineering and Nanotechnology (Biomedical Research Council, Agency for Science, Technology and Research, Singapore)
文摘AIM: To understand which and how different miRNAs are implicated in the process of hepatic stellate cell (HSC) activation. METHODS: We used microarrays to examine the differential expression of miRNAs during in vitro activation of primary HSCs (pHSCs). The transcriptome changes upon stable transfection of rno-miR-146a into an HSC cell line were studied using cDNA microarrays. Selected differentially regulated miRNAs were investigated by quantitative real-time polymerase chain reaction during in vivo HSC activation. The effect of miRNA mimics and inhibitor on the in vitro activation of pHSCs was also evaluated.RESULTS: We found that 16 miRNAs were upregulated and 26 were downregulated significantly in 10-d in vitro activated pHSCs in comparison to quiescent pHSCs. Overexpression of rno-miR-146a was characterized by marked upregulation of tissue inhibitor of metalloproteinase-3, which is implicated in the regulation of tumor necrosis factor-α activity. Differences in the regulation of selected miRNAs were observed comparing in vitro and in vivo HSC activation. Treatment with miR-26a and 29a mimics, and miR-214 inhibitor during in vitro activation of pHSCs induced significant downregulation of collagen type Ⅰ transcription. CONCLUSION: Our results emphasize the different regulation of miRNAs in in vitro and in vivo activated pHSCs. We also showed that miR-26a, 29a and 214 are involved in the regulation of collagen type I mRNA.
