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Article Abstract
Endothelial cell (EC) senescence is a major contributor in atherosclerosis (AS) development. Herein, the role of forkhead box P transcription factor 1 (FOXP1) and insulin-like growth factor (IGF)-1 in regulating EC senescence during AS progression was investigated. The mRNA and protein expressions were assessed using qRT-PCR and western blot. IL-1β and IL-18 secretion levels were analyzed by ELISA. Cell viability and pyroptosis were determined by MTT assay and flow cytometry, respectively. SA β-Gal staining was used to measure cell senescence. Tube formation assay was adopted to detect the angiogenesis ability. Dual-luciferase reporter and ChIP assays were used to investigate the relationship between FOXP1 and IGF‑1. ox-LDL stimulation significantly reduced FOXP1 and IGF-1 expression levels in human aortic endothelial cells (HAECs). FOXP1 or IGF-1 overexpression both mitigated ox-LDL-induced cellular senescence and NLRP3 activation in HAECs. It was subsequently revealed that FOXB1 transcriptionally activated IGF-1 expression in HAECs by binding to IGF-1 promoter. Rescue experiments demonstrated that IGF-1 silencing abolished the inhibitory impact of FOXP1 overexpression on ox-LDL-induced cellular senescence and NLRP3 activation in HAECs. FOXP1 transcriptionally activated IGF-1 to lighten ox-LDL-induced endothelial cellular senescence by inactivating NLRP3 inflammasome.
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