首页> 外文期刊>Endothelium: Journal of endothelial cell research >Activation of endothelial cell mitogen activated protein kinase ERK(1/2) by extracellular HIV-1 Tat protein.
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Activation of endothelial cell mitogen activated protein kinase ERK(1/2) by extracellular HIV-1 Tat protein.

机译:胞外HIV-1 Tat蛋白激活内皮细胞分裂原活化蛋白激酶ERK(1/2)。

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摘要

Extracellular Tat protein, the transactivating factor of the human immunodeficiency virus type 1 (HIV-1), modulates gene expression, growth, and angiogenic activity in endothelial cells by interacting with the vascular endothelial growth factor (VEGF) receptor-2 (Flk-1/KDR). Recombinant Tat protein, produced as glutathione-S-transferase chimera (GST-Tat), activates mitogen-activated protein kinase (MAPK) ERK(1/2) in human, murine, and bovine endothelial cells whereas GST is ineffective. In bovine aortic endothelial cells, GST-Tat and the 165 amino acid VEGF isoform (VEGF165) induce transient ERK(1/2) phosphorylation with similar potency and kinetics. The synthetic peptide Tat(41-60), but not peptides Tat(1-21) and Tat(71-86), causes ERK(1/2) phosphorylation, thus implicating Tat/KDR interaction in the activation of this signalling pathway. Accordingly, GST-Tat induces ERK(1/2) phosphorylation in KDR-transfected porcine aortic endothelial cells but not in parental cells. MAPK kinase inhibitors PD098059 and U0126 prevent ERK(1/2) phosphorylation by Tat. However, they do not affect the angiogenic activity exerted by Tat in the murine Matrigel plug and chick embryo chorioallantoic membrane assays. Blocking of MAPK kinase activity impairs instead the angiogenic response to VEGF165 and to fibroblast growth factor-2 (FGF-2). Our data demonstrate that ERK(1/2) activation following the interaction of HIV-1 Tat protein with endothelial cell Flk-1/KDR receptor does not represent an absolute requirement for a full angiogenic response to this growth factor that appears to utilize mechanism(s) at least in part distinct from those triggered by other prototypic angiogenic growth factors.
机译:细胞外Tat蛋白是人类免疫缺陷病毒1型(HIV-1)的反式激活因子,通过与血管内皮生长因子(VEGF)受体2(Flk-1)相互作用来调节内皮细胞的基因表达,生长和血管生成活性。 / KDR)。重组Tat蛋白以谷胱甘肽-S-转移酶嵌合体(GST-Tat)的形式产生,可激活人,鼠和牛内皮细胞中的促分裂原活化蛋白激酶(MAPK)ERK(1/2),而GST无效。在牛主动脉内皮细胞中,GST-Tat和165个氨基酸的VEGF同工型(VEGF165)诱导瞬时ERK(1/2)磷酸化,具有相似的效能和动力学。合成的肽Tat(41-60)而不是肽Tat(1-21)和Tat(71-86)引起ERK(1/2)磷酸化,因此暗示Tat / KDR相互作用激活了该信号通路。因此,GST-Tat诱导KDR转染的猪主动脉内皮细胞中的ERK(1/2)磷酸化,而不在亲代细胞中。 MAPK激酶抑制剂PD098059和U0126防止Tat导致ERK(1/2)磷酸化。但是,它们不影响Tat在鼠基质胶和鸡胚绒膜尿囊膜测定中发挥的血管生成活性。 MAPK激酶活性的阻断反而损害了对VEGF165和对成纤维细胞生长因子2(FGF-2)的血管生成反应。我们的数据表明,HIV-1 Tat蛋白与内皮细胞Flk-1 / KDR受体相互作用后的ERK(1/2)激活并不代表对这种生长因子的完全血管生成反应的绝对需求,该反应似乎利用了机制( s)至少部分不同于其他原型血管生成生长因子触发的那些。

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