目的探讨受体酪氨酸家族成员 Mer 基因对体外血管形成过程的影响及其具体作用机制。方法利用脂质体法将人全长 Mer 基因真核表达质粒转染到内皮细胞株 HMEC-1细胞中,G418筛选转染细胞得到阳性克隆,利用 PCR 和 Western blot 分别在 mRNA...目的探讨受体酪氨酸家族成员 Mer 基因对体外血管形成过程的影响及其具体作用机制。方法利用脂质体法将人全长 Mer 基因真核表达质粒转染到内皮细胞株 HMEC-1细胞中,G418筛选转染细胞得到阳性克隆,利用 PCR 和 Western blot 分别在 mRNA 和蛋白水平验证转染情况。利用Transwell 和 Matrigel 分别观察 Mer 基因过表达对于内皮细胞迁移能力和血管形成能力的影响。通过荧光定量 PCR 筛选血管内皮生长因子(VEGF)-A、VEGF-B、VEGF-C、VEGF-D以及血管内皮生长因子受体(VEGFR)-1、VEGFR-2基因的表达情况。结果经过 G418筛选后,PCR 和 Western blot 检测结果显示 Mer 基因在阳性克隆细胞中有较高水平表达,分别较空质粒对照组上升3.61倍和2.12倍;高表达 Mer 的 HMEC-1细胞迁移能力[迁移到 Transwell 下室壁的细胞为(21±6)/视野]较对照组[(36±11)/视野]明显下降。体外血管形成实验也表明高表达 Mer 基因的 HMEC-1细胞血管形成能力明显下降,抑制率为76.9%;荧光定量 PCR 结果显示 VEGF-C 和 VEGFR-2表达明显下降,VEGF-C 表达量为对照组的44.7%,VEGF-C 表达为对照组的25.6%。结论 Mer 过表达可以显著抑制 HEMC-1细胞的迁移能力和血管形成能力,并且可能是通过 VEGF-C/VEGFR-2信号途径发挥作用。展开更多
Aim Magnesium lithospermate B （MLB） is the most abundant hydrophilic active component of Salvia rniltiorrhiza Radix, a traditional Chinese herbal medicine mainly used to treat cardiovascular diseases. Studies have s...Aim Magnesium lithospermate B （MLB） is the most abundant hydrophilic active component of Salvia rniltiorrhiza Radix, a traditional Chinese herbal medicine mainly used to treat cardiovascular diseases. Studies have shown that endothelial activation contributes to the pathophysiology of cardiovascular diseases such as atherosclero- sis, diabetic vasculopathy, heart failure and hypertension. In the present study, the effects of MLB on endothelial activation were investigated. Lipopolysaccharide （LPS） 1 mg L^-1 was employed to induce endothelial activation, which was determined by relative gene expression and endothelial adhesion assay. Results showed that pretreatment with MLB attenuated LPS-induced ICAM1, VCAM1 and TNF-α upregulation in human dermal microvascular endo- thelial cells （HMEC-1） in dose-dependent manner, which contributed to the reduction of THP-1 adhesion to HMEC-1. Furthermore, it was revealed that 100 μmol · L^-1 MLB significantly decreased the nuclear translocation of NF-KB p65, a critical transcription factor in LPS-indueed inflammatory response, through the inhibition of IKBμ degradation. Besides, the transcriptional activity of NF-KB p65 was also inhibited by the pretreatment of MLB. Mo- reover, MLB pretreatment considerably inhibited LPS-induced p38 phosphorylation, which at least partly contribu- ted to the reduction of ICAM1 expression. In conclusion, these findings suggest that MLB inhibits LPS-induced nu- clear translocation and transcripitional activity of NF-KB, thus attenuates the increased expression of adhesion mole- cules and inflammatory factors, protects endothelial cells from LPS-induced activation.展开更多
文摘目的探讨受体酪氨酸家族成员 Mer 基因对体外血管形成过程的影响及其具体作用机制。方法利用脂质体法将人全长 Mer 基因真核表达质粒转染到内皮细胞株 HMEC-1细胞中,G418筛选转染细胞得到阳性克隆,利用 PCR 和 Western blot 分别在 mRNA 和蛋白水平验证转染情况。利用Transwell 和 Matrigel 分别观察 Mer 基因过表达对于内皮细胞迁移能力和血管形成能力的影响。通过荧光定量 PCR 筛选血管内皮生长因子(VEGF)-A、VEGF-B、VEGF-C、VEGF-D以及血管内皮生长因子受体(VEGFR)-1、VEGFR-2基因的表达情况。结果经过 G418筛选后,PCR 和 Western blot 检测结果显示 Mer 基因在阳性克隆细胞中有较高水平表达,分别较空质粒对照组上升3.61倍和2.12倍;高表达 Mer 的 HMEC-1细胞迁移能力[迁移到 Transwell 下室壁的细胞为(21±6)/视野]较对照组[(36±11)/视野]明显下降。体外血管形成实验也表明高表达 Mer 基因的 HMEC-1细胞血管形成能力明显下降,抑制率为76.9%;荧光定量 PCR 结果显示 VEGF-C 和 VEGFR-2表达明显下降,VEGF-C 表达量为对照组的44.7%,VEGF-C 表达为对照组的25.6%。结论 Mer 过表达可以显著抑制 HEMC-1细胞的迁移能力和血管形成能力,并且可能是通过 VEGF-C/VEGFR-2信号途径发挥作用。
文摘Aim Magnesium lithospermate B （MLB） is the most abundant hydrophilic active component of Salvia rniltiorrhiza Radix, a traditional Chinese herbal medicine mainly used to treat cardiovascular diseases. Studies have shown that endothelial activation contributes to the pathophysiology of cardiovascular diseases such as atherosclero- sis, diabetic vasculopathy, heart failure and hypertension. In the present study, the effects of MLB on endothelial activation were investigated. Lipopolysaccharide （LPS） 1 mg L^-1 was employed to induce endothelial activation, which was determined by relative gene expression and endothelial adhesion assay. Results showed that pretreatment with MLB attenuated LPS-induced ICAM1, VCAM1 and TNF-α upregulation in human dermal microvascular endo- thelial cells （HMEC-1） in dose-dependent manner, which contributed to the reduction of THP-1 adhesion to HMEC-1. Furthermore, it was revealed that 100 μmol · L^-1 MLB significantly decreased the nuclear translocation of NF-KB p65, a critical transcription factor in LPS-indueed inflammatory response, through the inhibition of IKBμ degradation. Besides, the transcriptional activity of NF-KB p65 was also inhibited by the pretreatment of MLB. Mo- reover, MLB pretreatment considerably inhibited LPS-induced p38 phosphorylation, which at least partly contribu- ted to the reduction of ICAM1 expression. In conclusion, these findings suggest that MLB inhibits LPS-induced nu- clear translocation and transcripitional activity of NF-KB, thus attenuates the increased expression of adhesion mole- cules and inflammatory factors, protects endothelial cells from LPS-induced activation.
