8 research outputs found

    水溶性番茄浓缩物 Fruitflow 通过调控血小板 PI3K/Akt和MAPKs 信号通路抑制其活化、聚集及血栓形成

    Get PDF
    【目的】血小板过度活化可促进血栓以及心血管疾病的发生发展,水溶性番茄浓缩物Fruitflow作为膳食补充剂在预防心血管疾病中发挥重要作用,但机制未明,且尚无Fruitflow对血栓形成影响的研究。本研究拟探讨Fruitflow对健康人血小板聚集、活化及血栓形成的影响,并探索其可能的作用机制。【方法】用不同浓度(0、20、40、80mg/L)的Fruitflow与健康成人血小板在体外共孵育,使用血小板聚集仪测定血小板聚集率;用流式细胞仪测定血小板表面αIIbβ3活化及纤维蛋白原结合率;用体视荧光显微镜观察FeCl3诱导的小鼠肠系膜动脉血栓模型中血栓的形成;通过小鼠剪尾实验测定出血时间;用Western blot检测血小板Akt、Erk1/2、JNK总蛋白表达及其磷酸化水平。【结果】在ADP诱导下,20、40、80mg/L的Fruitflow均可有效降低血小板聚集率,且效应呈剂量依赖性,其中80mg/L的Fruitflow干预组血小板聚集率从对照组的(43.75±5.91)%降到了(8.25±4.57)%(0.05);Fruitflow下调血小板Akt、Erk1/2和JNK蛋白的磷酸化水平,与对照组相比,80mg/L Fruitflow干预后P-Akt/Akt由0.97±0.07降至0.33±0.13(<0.001),P-Erk1/2/Erk1/2由0.89±0.09降至0.24±0.02(<0.01),P-JNK/JNK由0.97±0.12降至0.45±0.04(<0.01)。【结论】抑制血小板PI3K/Akt和MAPKs信号可能是Fruitflow抑制血小板聚集活化和血栓形成的机制之一

    中国H型高血压患者自述睡眠质量及其影响因素分析

    Get PDF
    目的探讨H型高血压患病人群睡眠质量及其影响因素,为提高其睡眠质量提供理论依据。方法2017年2月至2018年5月,按性别、年龄及地区分层随机抽取我国14个省的2 609名H型高血压患者,进行睡眠质量及其潜在影响因素的横断面问卷调查。结果最终纳入分析的研究对象共2 587人(男性1 388人,女性1 199人),年龄范围为24至97岁。H型高血压患者睡眠质量差的比例为19.0%,其中,女性睡眠质量差的比例明显高于男性(23.9% vs.14.8%, P&lt;0.001)。适当体力活动[OR=0.572;95% CI为(0.421,0.776),P&lt;0.001]、水果蔬菜摄入量≥1 500 g/周[OR=0.672;95% CI为(0.485,0.931),P=0.017]、适量吃肉[OR=0.472;95% CI为(0.306,0.728),P=0.001]及睡眠时长≥8 h/d [OR=0.008;95% CI为(0.004,0.013),P&lt;0.001]是睡眠质量保护因素;舒张压≥90mmHg[OR=1.441;95% CI为(1.112,1.868),P=0.006]、当地生活水平差[OR=2.542;95% CI为(1.401,4.613),P=0.002]、有慢性肾病史[OR=1.970;95% CI为(1.053,3.687),P=0.034]、日常生活压力大[OR=2.253;95% CI为(1.400,3.626),P=0.001]、动物油作烹调油[OR=1.759;95% CI为(1.056,2.930),P=0.030]及严重鼾症[OR=1.784;95% CI为(1.018,3.126),P=0.043]是睡眠质量危险因素。结论适当体力活动,多食用水果蔬菜,烹调用油选择植物油,适量吃肉,控制血压,减小生活或工作压力、治疗鼾症、充足的睡眠时间可能有助于提高H型高血压患者睡眠质量,进而改善其生活质量

    短期高盐饮食对过敏性哮喘小鼠气道炎症的影响

    Get PDF
    目的探讨短期高盐饮食对过敏性哮喘小鼠气道炎症的影响。方法20只4 周龄雌性 BALB/c 小鼠随机分为 4 组,即正常对照组、过敏性哮喘模型组、4%高盐饮食组和8%高盐饮食组。卵清蛋白 (OVA) 致敏和激发建立过敏性哮喘模型,正常组和模型组给予普通饲料和饮水,高盐饮食组分别给予4%和8%的高盐饲料以及1%的盐水。25 d后,在最后一次激发时观察各组小鼠的鼻部症状,24 h后处死小鼠。五分类血细胞分析测定全血中各亚型炎症细胞,苏木精-伊红(HE)染色观察肺部嗜酸性粒细胞浸润情况,过碘酸-雪夫(PAS)染色观察肺组织杯状细胞增生情况,流式细胞术检测肺组织中辅助性T 细胞1(Th1细胞)、Th2、Th17细胞和调节性T细胞(Treg细胞)比例,酶联免疫吸附法(ELISA)测定肺泡灌洗液(BALF)中的细胞因子白介素-4(IL-4)、IL-5、IL-13和IL-17的水平。结果与过敏性哮喘模型组相比,4%与8%高盐饮食均可以显著降低过敏性哮喘小鼠血嗜酸性粒细胞比例、肺组织Th17细胞比例以及BALF中IL-13与IL-17的水平,但8%高盐饮食降低IL-13水平的效果比4%高盐饮食更明显(P&lt;0.05);而仅有8%高盐饮食可显著缓解过敏性哮喘小鼠鼻部症状,改善肺组织嗜酸性粒细胞浸润以及杯状细胞增生情况,降低肺组织Th2细胞比例和Th2/ Th1比值,减少BALF中细胞因子 IL-4和IL-5的表达水平(P&lt;0.05)。结论短期高盐饮食可缓解过敏性哮喘小鼠的气道炎症,且8%高盐饮食改善效果优于4%高盐饮食

    水溶性番茄浓缩物经自噬途径调控血小板的氧化损伤

    Get PDF
    目的过度氧化应激可促进血小板氧化损伤,从而加快心血管疾病的发生发展。水溶性番茄浓缩物(Fruitflow)具有抑制血小板聚集、活化的作用,但是否通过自噬减轻血小板氧化损伤仍未见报道。本研究拟通过体外实验探讨Fruitflow对过氧化氢(H2O2)导致的血小板氧化损伤的影响及其潜在机制。方法用不同剂量的Fruitflow (0、20、40、80 mg/L)与纯化血小板预孵育30 min,随后加入H2O2共孵育60 min。用流式细胞术测定线粒体膜电位(ΔΨm)去极化的水平;用酶标仪测定活性氧(ROS)生成水平;用Western blot测定p53、phospho-p53、LC3 Ⅱ/Ⅰ、p62的表达水平。结果Fruitflow 显著减轻H2O2导致的血小板ΔΨm 去极化(P&lt;0.05),ROS 生成和p53磷酸化(P &lt; 0.05)。自噬抑制剂3-甲基腺嘌呤(3-Methyladenine,3-MA)可以显著逆转Fruitflow 对H2O2处理血小板ROS生成的抑制作用(P&lt;0.05)。Fruitflow 可以降低静息血小板p62的表达、升高LC3Ⅱ/Ⅰ的比例(P&lt;0.05),也显著升高H2O2处理的血小板LC3Ⅱ/Ⅰ的表达水平(P&lt;0.05)。此外,3-MA显著逆转Fruitflow降低H2O2处理的血小板ΔΨm 去极化的作用(P&lt;0.05)。结论Fruitflow可在体外通过促进血小板自噬,显著减轻H2O2导致的血小板氧化损伤

    Prediction of Energy Resolution in the JUNO Experiment

    Get PDF
    International audienceThis paper presents the energy resolution study in the JUNO experiment, incorporating the latest knowledge acquired during the detector construction phase. The determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken in the design and production of the key components of the JUNO detector. Various factors affecting the detection of inverse beta decay signals have an impact on the energy resolution, extending beyond the statistical fluctuations of the detected number of photons, such as the properties of liquid scintillator, performance of photomultiplier tubes, and the energy reconstruction algorithm. To account for these effects, a full JUNO simulation and reconstruction approach is employed. This enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy resolution. The study reveals an energy resolution of 2.95% at 1 MeV. Furthermore, the study assesses the contribution of major effects to the overall energy resolution budget. This analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data taking. Moreover, it provides a guideline in comprehending the energy resolution characteristics of liquid scintillator-based detectors

    JUNO Sensitivity on Proton Decay pνˉK+p\to \bar\nu K^+ Searches

    Get PDF
    The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in pνˉK+p\to \bar\nu K^+ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via pνˉK+p\to \bar\nu K^+ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is 9.6×10339.6 \times 10^{33} years, competitive with the current best limits on the proton lifetime in this channel

    JUNO sensitivity on proton decay p → ν K + searches*

    No full text
    The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the pνˉK+ p\to \bar{\nu} K^+ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via pνˉK+ p\to \bar{\nu} K^+ is 36.9% ± 4.9% with a background level of 0.2±0.05(syst)±0.2\pm 0.05({\rm syst})\pm 0.2(stat) 0.2({\rm stat}) events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is 9.6×1033 9.6 \times 10^{33} years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies

    JUNO sensitivity on proton decay pνK+p → νK^{+} searches

    No full text
    corecore