6 research outputs found

    人参皂苷Rb1通过抑制NF-κB p65介导的炎症和氧化应 激改善内皮细胞复制性衰老

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    【目的】本研究旨在探讨人参皂苷Rb1对内皮细胞复制性衰老的作用和机制。【方法】建立人原代脐 静脉内皮细胞(HUVEC)复制性衰老模型,根据细胞形态的变化、衰老相关β-半乳糖苷酶(SA-β-Gal)染色阳性 率和纤溶酶原激活物抑制剂1(PAI-1)的表达水平评估HUVEC衰老;将复制性衰老模型细胞分为0、20、40、80、 100μmol/LRb1组,不同浓度人参皂苷Rb1处理衰老细胞48h后观察衰老指标SA-β-Gal染色和PAI-1蛋白变 化,每组3个复孔;采用Westernblot方法检测对照组(CPDL2的HUVEC)、模型组(衰老细胞组)及人参皂苷Rb1 组核因子κBp65(NF-κBp65)的活性,每组3个复孔;检测对照组、模型组及人参皂苷Rb1组细胞培养液中氧化 应激和炎症指标,每组3个复孔。【结果】累计细胞群体倍增值(CPDL)16的HUVEC可作为复制性衰老模型;与 0μmol/LRb1组相比,80μmol/LRb1组SA-β-Gal染色阳性细胞数和PAI-1蛋白表达均明显降低(P<0.001);复 制性衰老细胞中超氧化物歧化酶(SOD)的活力明显低于对照组(P<0.001),而丙二醛(MDA)、白细胞介素-6 (IL-6)、肿瘤坏死因子-α(TNF-α)的含量及NF-κBp65的活性均明显高于对照组(P<0.001),80μmol/L人参皂 苷Rb1处理后SOD活力明显增加(P<0.05),MDA、IL-6、TNF-α的产量明显减少(P<0.05),NF-κBp65活性降 低(P<0.001)。【结论】人参皂苷Rb1可通过抑制NF-κBp65介导的氧化应激和炎症反应延缓复制性内皮细胞衰老

    人参皂苷Rb1通过Sirt3/SOD2通路延缓高糖诱导的人脐静脉内皮细胞衰老

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    【目的】本研究拟探讨人参皂苷Rb1通过调节沉默信息调节因子3/超氧化物歧化酶2(Sirt3/SOD2)通路延缓高糖诱导的人脐静脉内皮细胞(HUVEC)衰老的作用和机制。【方法】建立高糖(40mmol/L葡萄糖)诱导的HUVEC早熟性衰老模型,根据衰老相关β-半乳糖苷酶(SA-β-Gal)阳性率及Ⅰ型纤溶酶原激活物抑制因子(PAI-1)和P16表达评估HUVEC衰老,并采用AnnexinV-FITC/PI排除细胞凋亡的发生。采用Westernblot检测各组Sirt3与SOD2表达的变化。同时检测细胞内丙二醛(MDA)及SOD2活性的水平。【结果】40mmol/L葡萄糖处理24h可成功诱导HUVEC衰老,并未发生细胞凋亡,早熟性衰老的HUVECSA-β-Gal阳性率明显增多,PAI-1及P16表达增多,Sirt3及SOD2表达均减少,MDA含量升高,SOD2活性降低(P<0.05)。与高糖处理组比较,40μmol/L人参皂苷Rb1预处理延缓HUVEC早熟性衰老,SA-β-Gal阳性率明显减少,PAI-1及P16表达减少,Sirt3及SOD2表达均增多,MDA含量降低,SOD2活性升高(P<0.05)。与人参皂苷Rb1处理组相比,Sirt3特异性抑制剂3-TYP处理后,人参皂苷Rb1保护作用消失,HUVECPAI-1及P16表达升高,Sirt3及SOD2表达均减少。【结论】人参皂苷Rb1可通过激活Sirt3/SOD2信号通路延缓高糖诱导的HUVEC早熟性衰老

    Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

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    We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements

    Amplitude analysis of the decays D0π+ππ+πD^0\rightarrow\pi^+\pi^-\pi^+\pi^- and D0π+ππ0π0D^0\rightarrow\pi^+\pi^-\pi^0\pi0

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    Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024*

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    Determination of the number of ψ(3686) events taken at BESIII

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    The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^
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