SIRT1在PM2.5致HUVECs应激性衰老中的作用
首发时间:2023-04-17
摘要:【目的】探究SIRT1在PM2.5致HUVECs应激性衰老中的作用及其机制,为PM2.5致血管内皮细胞衰老的深入研究提供基础资料。【方法】采用12.5 μg/mL PM2.5处理HUVECs至第10代并使用SIRT1特异性激活剂SRT1720进行干预处理,利用DCFH-DA荧光探针检测ROS的水平,同时检测细胞的SA-β-gal阳染率以及细胞周期变化情况,通过Western Blot法测定细胞中SIRT1、PGC-1α、SIRT3、 FOXO3a和SOD2的蛋白表达情况,以及细胞衰老相关蛋白P53、P21、P16和PAI-1的变化情况。【结果】与对照组相比,PM2.5长期暴露后,PM2.5组HUVECs细胞SIRT1、PGC-1α、SIRT3以及FOXO3a和SOD2蛋白表达均下降,差异有统计学意义(P < 0.05),ROS水平升高(P < 0.05),SA-β-gal阳染率呈现上升趋势(P < 0.05),G1期细胞比例增加(P < 0.05),细胞衰老相关蛋白P53、P21、P16以及PAI-1表达升高(P < 0.05);使用SIRT1特异性激活剂SRT1720处理后,PM2.5+SRT1720组HUVECs细胞SIRT1、PGC-1α、SIRT3以及FOXO3a和SOD2蛋白表达升高(P < 0.05),ROS水平降低(P < 0.05),SA-β-gal阳染率降低(P < 0.05)、G1期细胞比例降低(P < 0.05)、细胞衰老相关蛋白P53、P21、P16以及PAI-1表达降低(P < 0.05)。【结论】本研究结果表明,PM2.5可通过下调SIRT1蛋白表达水平,引起下游PGC-1α和SIRT3表达下降,从而导致FOXO3a和SOD2表达降低,促进ROS水平上升,最终诱导HUVECs发生应激性衰老。
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Role of SIRT1 in stress-induced senescence of HUVECs caused by PM2.5
Abstract:【Objective】To investigate the changes of SIRT1 in PM2.5-induced stress-induced senescence in HUVECs and its mechanism of action, and to provide basic information for the in-depth study of PM2.5-induced vascular endothelial cell senescence. 【Methods】HUVECs were treated with 12.5 μg/mL PM2.5 up to the 10th generation and treated with the SIRT1-specific activator SRT1720 for intervention. The protein expression of SIRT1, PGC-1α, SIRT3, FOXO3a and SOD2, and the changes of P53, P21, P16 and PAI-1, which are related to cellular senescence, were measured by Western Blot.【Results】 Compared with the control group, after long-term PM2.5 exposure, the protein expression of SIRT1, PGC-1α, SIRT3, as well as FOXO3a and SOD2 in HUVECs cells of PM2.5 group decreased with statistically significant differences (P < 0.05), the level of ROS increased (P < 0.05), the positive staining rate of SA-β-gal showed an increasing trend (P < 0.05), the proportion of G1-phase cells increased (P < 0.05), and the expression of cellular senescence-associated proteins P53, P21, P16, and PAI-1 increased (P < 0.05); after treatment with the SIRT1-specific activator SRT1720, HUVECs cells in the PM2.5+SRT1720 group showed increased expression of SIRT1, PGC-1α, SIRT3, and FOXO3a and SOD2 protein expression were increased (P < 0.05), ROS level was decreased (P < 0.05), SA-β-gal positive staining rate was decreased (P < 0.05), the percentage of G1 phase cells was decreased (P < 0.05), and cellular senescence-related proteins P53, P21, P16, and PAI-1 expression was decreased (P < 0.05). 【Conclusion】The results of this study suggest that PM2.5 can induce stress senescence in HUVECs by down-regulating SIRT1 protein expression levels and causing a decrease in downstream PGC-1α and SIRT3 expression, which leads to a decrease in FOXO3a and SOD2 expression and promotes an increase in ROS levels, and ultimately induces stress-induced senescence.
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