title: Interleukin-8 prevents oxidative stress-induced human endothelial cell senescence via telomerase activation.
abstract: Senescence is an irreversible growth arrest which can be triggered by stresses such as oxidative reaction, telomere shortening, DNA damage, or oncogene signaling. Oxidative stress accelerates vascular endothelial cell senescence, and may promote atherosclerosis in humans. Interleukin-8 (IL-8) has been shown to play an important role in tumor growth, angiogenesis, and metastasis, and has close relationship with oxidative stress. The objective of this study was to determine if IL-8 might be able to prevent oxidative stress-induced senescence of endothelial cells and the mechanisms. Human umbilical vein endothelial cells (HUVECs) were cultured and stimulated with hydrogen peroxide in the absence or presence of IL-8. After ex vivo cultivation, HUVECs became senescent as determined by acidic beta-galactosidase staining. IL-8 dose-dependently inhibited the onset of HUVEC senescence. Western blots indicated that IL-8 attenuated the oxidative stress induced high-expression of cell cycle regulation protein and inhibited the activation of p38 and NF-κB pathway. IL-8 also increased telomerase activity which was accompanied with upregulation of the catalytic subunit, telomerase reverse transcriptase (TERT), whereas these effects were significantly attenuated by SB 225002 (selective non-peptide CXCR2 antagonist). In conclusion, IL-8 exerted protective effects against endothelial senescence, which may be related to the activation of telomerase.
authors.affiliation: Department of Cardiology, Biomedical Research (Therapy) Center, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, 310058, PR China.
authors.forename: Xiao-Hua
authors.initials: XH
authors.lastname: Shen
authors.forename: Sheng-Jie
authors.initials: SJ
authors.lastname: Xu
authors.forename: Chong-Yin
authors.initials: CY
authors.lastname: Jin
authors.forename: Fang
authors.initials: F
authors.lastname: Ding
authors.forename: Yu-Cheng
authors.initials: YC
authors.lastname: Zhou
authors.forename: Guo-Sheng
authors.initials: GS
authors.lastname: Fu
mesh_terms: D002478:Cells, Cultured; D016922:Cellular Senescence / Q000187:drug effects*; D061307:Human Umbilical Vein Endothelial Cells / Q000187:drug effects* / Q000378:metabolism; D006801:Humans; D016209:Interleukin-8 / Q000494:pharmacology*; D016328:NF-kappa B / Q000378:metabolism; D018384:Oxidative Stress; D010671:Phenylurea Compounds; D012333:RNA, Messenger / Q000378:metabolism; D023063:Receptors, Interleukin-8B / Q000037:antagonists & inhibitors; D019098:Telomerase / Q000235:genetics / Q000378:metabolism*; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: D016209:Interleukin-8; D016328:NF-kappa B; D010671:Phenylurea Compounds; D012333:RNA, Messenger; D023063:Receptors, Interleukin-8B; C112019:SB 225002; D048051:p38 Mitogen-Activated Protein Kinases; C509186:TERT protein, human; D019098:Telomerase