title: Interleukin-1 beta increases activity of human endothelial progenitor cells: involvement of PI3K-Akt signaling pathway.
abstract: Interleukin-1β (IL-1β) is a multifunctional proinflammatory cytokine upregulated in acute phase of heart ischemic disease. Controversial effects of IL-1β have been demonstrated on endothelial progenitor cells (EPCs) functional activity. The aim of this study was to investigate the in vitro effect of IL-1β on activity of human origin EPCs and the possible mechanism involved. EPCs were isolated from peripheral blood of healthy volunteers without cardiovascular risk factors and characterized. After ex vivo cultivation, EPCs were stimulated with a series of final concentrations (0, 0.1, 1, and 10 ng/ml) of IL-1β for 24 h. In some other experiments, EPCs were pretreated with 10 μM LY294002 (Akt inhibitor) for 30 min and then stimulated with 1 ng/ml IL-1β for 24 h. Cell proliferation, apoptosis, adhesion, and migration were determined, respectively, by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay, annexin V/propidium iodide binding assay, adhesion assay, and transwell migration assay. In addition, the vascular endothelial vascular growth factor-A (VEGF-A) production has been examined using quantitative real-time RT-PCR and ELISA assay. Furthermore, the total and phosphorylation level of Akt was determined by Western blot. IL-1β significantly stimulated EPC proliferation, migration, and adhesion and upregulated the angiogenic growth factor VEGF-A at mRNA and protein level, while exerted no influence on cell apoptosis. However, pretreatment with LY294002 significantly diminished IL-1β-induced proliferation, migration, adhesion, and VEGF-A production. One nanogram per milliliter IL-1β for 15 min activated phosphorylation of Akt. These results suggest a potent role for IL-1β in upregulating EPCs functions. The phosphatidyl-inositol-3-kinase-Akt signaling pathway could be involved in the regulation of EPCs functions induced by IL-1β.
authors.affiliation: Department of Cardiology, First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qing Chun Road, Hangzhou, 310003, Zhejiang, People's Republic of China.
authors.forename: Lin
authors.initials: L
authors.lastname: Yang
authors.forename: Xiao-Gang
authors.initials: XG
authors.lastname: Guo
authors.forename: Chang-Qing
authors.initials: CQ
authors.lastname: Du
authors.forename: Jin-Xiu
authors.initials: JX
authors.lastname: Yang
authors.forename: Dong-Mei
authors.initials: DM
authors.lastname: Jiang
authors.forename: Bo
authors.initials: B
authors.lastname: Li
authors.forename: Wen-Jing
authors.initials: WJ
authors.lastname: Zhou
authors.forename: Fu-Rong
authors.initials: FR
authors.lastname: Zhang
mesh_terms: D017209:Apoptosis / Q000187:drug effects; D002448:Cell Adhesion / Q000187:drug effects; D002465:Cell Movement / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D002867:Chromones / Q000494:pharmacology; D042783:Endothelial Cells / Q000502:physiology*; D006801:Humans; D053583:Interleukin-1beta / Q000378:metabolism* / Q000494:pharmacology; D009025:Morpholines / Q000494:pharmacology; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism*; D010766:Phosphorylation; D051057:Proto-Oncogene Proteins c-akt / Q000037:antagonists & inhibitors / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011994:Recombinant Proteins / Q000494:pharmacology; D015398:Signal Transduction / Q000187:drug effects; D013234:Stem Cells / Q000502:physiology*; D015854:Up-Regulation; D042461:Vascular Endothelial Growth Factor A / Q000096:biosynthesis / Q000235:genetics
chemical_list: D002867:Chromones; D053583:Interleukin-1beta; D009025:Morpholines; D012333:RNA, Messenger; D011994:Recombinant Proteins; C467484:VEGFA protein, human; D042461:Vascular Endothelial Growth Factor A; C085911:2-(4-morpholinyl)-8-phenyl-4H-1-benzopyran-4-one; D019869:Phosphatidylinositol 3-Kinases; D051057:Proto-Oncogene Proteins c-akt