Cleaved high molecular weight kininogen stimulates JNK/FOXO4/MnSOD pathway for induction of endothelial progenitor cell senescence

Cleaved high molecular weight kininogen stimulates JNK/FOXO4/MnSOD pathway for induction of endothelial progenitor cell senescence
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裂解的高分子量激肽原刺激 JNK/FOXO4/MnSOD 途径诱导内皮祖细胞衰老

DOI:
10.1016/j.bbrc.2014.06.112
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发表时间:
2012-04
影响因子:
3.1
通讯作者:
Yi Wu
Yi Wu
中科院分区:
生物学4区
文献类型:
--
作者:
Xuemei Zhu;Xichen Zheng;Yi Wu

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最近,我们报道了裂解的高分子量激肽原(HKa)通过诱导活性氧(ROS)加速内皮祖细胞(EPCs)衰老的发生。然而,HKA诱导ROS产生的机制仍然未知。在这项研究中,我们已经表明,HKa诱导EPC衰老通过刺激c-Jun N-末端激酶(JNK)相关pathway.Methods and resultsTreatment的人EPCs与HKa 72小时刺激JNK磷酸化在Thr 183/Tyr 185,和FOXO 4磷酸化在Thr 451,伴随着,上调MnSOD的表达在蛋白和mRNA水平在浓度依赖性的方式。HKa增加细胞内H2 O2水平,而不影响过氧化氢酶的表达。为了缩小HK α的功能域,制备了人HK重链(HC,19- 380 aa)和轻链(LC,390- 644 aa)的重组蛋白。HC,而不是LC,增加EPCs和细胞内ROS水平的衰老,在类似的程度与HKA。此外,HC在50 nM增加FOXO 4磷酸化的Thr 451和MnSOD的蛋白水平在EPCs.ConclusionThese结果表明,HKa通过刺激JNK/FOXO 4/MnSOD通路加速EPC衰老的开始,其作用是由HC介导的。
ObjectiveRecently we have reported that cleaved high molecular weight kininogen (HKa) accelerates the onset of endothelial progenitor cells (EPCs) senescence by induction of reactive oxygen species (ROS). However, the mechanisms by which HKa induces production of ROS remain unknown. In this study, we have shown that HKa induces EPC senescence via stimulation of c-Jun N-terminal kinases (JNK)-related pathway.Methods and resultsTreatment of human EPCs with HKa for 72 h stimulated JNK phosphorylation at Thr183/Tyr185, and FOXO4 phosphorylation at Thr451, Concomitantly, upregulated the expression of MnSOD at protein and mRNA levels in a concentration-dependent manner. HKa increased intracellular level of H2O2, without affecting the expression of catalase. To narrow down the functional domain of HKa, recombinant proteins of human HK heavy chain (HC, 19–380aa) and light chain (LC, 390–644aa) were generated. HC, but not LC, increased senescence of EPCs and intracellular ROS levels, to a similar extent with HKa. Moreover, HC at 50 nM increased FOXO4 phosphorylation at Thr451 and the protein level of MnSOD in EPCs.ConclusionThese results demonstrate that HKa accelerates the onset of EPC senescence by stimulating JNK/FOXO4/MnSOD pathway, its effect is mediated by the HC.
DOI: --
发表时间: 2007
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影响因子: 9.2
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