SD

SD
  • 文章类型: Journal Article
    睡眠剥夺(SD)会削弱免疫系统,并导致对传染病或炎性疾病的易感性增加。然而,尚不清楚SD如何影响体液免疫。在本研究中,睡眠障碍是使用睡眠剥夺工具进行的,细菌内毒素脂多糖(LPS)用于激活免疫应答。发现SD预处理减少了LPS诱导的IgG2bB细胞和脾淋巴细胞中IgG2b同种型抗体的产生。And,SD预处理降低了CD4+T细胞的比例,CD4+T细胞衍生的TGF-β1的产生及其在帮助IgG2b产生中的贡献。此外,SD后淋巴细胞中BMAL1和CLOCK选择性上调。重要的是,BMAL1和CLOCK缺乏有助于TGF-β1的表达和IgG2bB细胞的产生。因此,我们的结果为解释SD应激条件下BMAL1和CLOCK的参与提供了新的见解,以及它们在抑制TGF-β1表达和减少LPS诱导的IgG2b产生中的作用。
    Sleep deprivation (SD) weakens the immune system and leads to increased susceptibility to infectious or inflammatory diseases. However, it is still unclear how SD affects humoral immunity. In the present study, sleep disturbance was conducted using an sleep deprivation instrument, and the bacterial endotoxin lipopolysaccharide (LPS) was used to activate the immune response. It was found that SD-pretreatment reduced LPS-induced IgG2b+ B cells and IgG2b isotype antibody production in lymphocytes of spleen. And, SD-pretreatment decreased the proportion of CD4+T cells, production of CD4+T cells derived TGF-β1 and its contribution in helping IgG2b production. Additionally, BMAL1 and CLOCK were selectively up-regulated in lymphocytes after SD. Importantly, BMAL1 and CLOCK deficiency contributed to TGF-β1 expression and production of IgG2b+ B cells. Thus, our results provide a novel insight to explain the involvement of BMAL1 and CLOCK under SD stress condition, and their roles in inhibiting TGF-β1 expression and contributing to reduction of LPS induced IgG2b production.
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  • 文章类型: Journal Article
    近年来,随着全球对可持续发展概念的认可,国际市场非常重视环境,社会,和企业治理(ESG)投资绩效。“碳峰值和碳中和”目标对中国企业开展ESG投资提出了要求。作为中国的大型国有企业,电网公司需要率先进行ESG投资。基于系统动力学(SD)理论,本文建立了电网公司ESG责任投资的仿真模型,包括环境投资子模块,社会投资子模块,和治理投资子模块。以某省级电网公司为例,对电网企业ESG投资进行了数值模拟。电网公司ESG投资的实际投入产出效率通过关键指标与投资额的映射关系来体现,并对未来几年电力公司的ESG投资规模和投资权重进行了预测。与传统的静态分析方法相比,该模型可为电网企业进行ESG投资决策提供理论依据。
    In recent years, with the global recognition of the concept of sustainable development, the international market attaches great importance to the Environment, Society, and Governance (ESG) investment performance of enterprises. The \"carbon peaking and carbon neutrality\" goal puts forward requirements for Chinese enterprises to carry out ESG investment. As a large state-owned enterprise in China, power grid companies need to take the lead in ESG investment. Based on the System Dynamics (SD) theory, this paper establishes the simulation model of ESG-responsible investment of power grid companies, including the environmental investment sub-module, social investment sub-module, and governance investment sub-module. Taking a provincial Power Grid Company as an example, the numerical simulation of ESG investment of power grid companies is carried out. The actual input-output efficiency of ESG investment of power grid companies is reflected through the mapping relationship between key indicators and investment amount, and the ESG investment scale and investment weight of the Power Company in the coming years are predicted. Compared with the traditional static analysis method, this model can provide a theoretical basis for power grid companies to carry out ESG investment decisions.
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  • 文章类型: Journal Article
    Lab safety problems have become an impeding factor that cannot be ignored in normal teaching and scientific research activities at colleges and universities. As the risk factors of lab accidents can be conceptualized as occurring at multiple levels, systematically improving and optimizing lab safety is the crucial route to accident prevention in labs. In this paper, a novel method that integrates a structural equation model (SEM) and system dynamics (SD) is presented to dynamically assess lab safety with the characteristics of insufficient data and uncertainty. On the basis of a questionnaire investigation, the SEM was utilized to determine the influencing factors on lab safety and acquire the path coefficients among these factors, which were embedded into the SD model as the weight of the influencing factors. An illustration was carried out to test and validate the proposed method, and a sensitivity analysis was also conducted to recognize variables contributing the most to the improvement of lab safety. The results demonstrated that the safety input of human and management subsystems is the most effective to improve the lab safety; meanwhile, \"safety awareness\", \"emergency ability\", \"operation skills\", \"safety culture\" and \"safety training\" are the top five contributing factors, which can promote lab safety in the shortest time.
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  • 文章类型: Journal Article
    OBJECTIVE: Sleep loss is common in patients with liver injury, but the effects of sleep deprivation (SD) on liver injury remain unclear. In the present study, the potential effects of SD on acute liver injury and the underlying mechanisms have been investigated.
    METHODS: The sleep of male BALB/c mice has been deprived by using a modified multiple platform water bath for 3 days and acute liver injury was induced by intraperitoneal injection of lipopolysaccharide (LPS) and D-galactosamine (D-Gal). The degree of liver injury was detected by aminotransferase determination, histopathology and survival rate analysis. Inflammatory response and melatonin (MT) were measured by enzyme-linked immunosorbent assay (ELISA). In addition, hepatocyte apoptosis was determined by caspase activity measurement and terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay.
    RESULTS: We observed that SD increased plasma aminotransferases, TUNEL-positive hepatocytes, histological abnormalities and mortality rates in mice with LPS/D-Gal treatment. SD also promoted LPS/D-Gal-induced production of TNF-α and upregulated hepatic caspase-8, caspase-9, and caspase-3 activities in LPS/D-Gal-exposed mice. In addition, SD significantly decreased MT contents in plasma of mice with acute liver injury, but supplementation with MT reversed these SD-promoted changes.
    CONCLUSIONS: Our data suggested that SD exacerbated LPS/D-Gal-induced liver injury via decreasing melatonin production.
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  • 文章类型: Journal Article
    When reporting the results of clinical studies, some researchers may choose the five-number summary (including the sample median, the first and third quartiles, and the minimum and maximum values) rather than the sample mean and standard deviation (SD), particularly for skewed data. For these studies, when included in a meta-analysis, it is often desired to convert the five-number summary back to the sample mean and SD. For this purpose, several methods have been proposed in the recent literature and they are increasingly used nowadays. In this article, we propose to further advance the literature by developing a smoothly weighted estimator for the sample SD that fully utilizes the sample size information. For ease of implementation, we also derive an approximation formula for the optimal weight, as well as a shortcut formula for the sample SD. Numerical results show that our new estimator provides a more accurate estimate for normal data and also performs favorably for non-normal data. Together with the optimal sample mean estimator in Luo et al., our new methods have dramatically improved the existing methods for data transformation, and they are capable to serve as \"rules of thumb\" in meta-analysis for studies reported with the five-number summary. Finally for practical use, an Excel spreadsheet and an online calculator are also provided for implementing our optimal estimators.
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  • 文章类型: Journal Article
    Tris(2-chloroethyl)phosphate (TCEP) is a widely used environmental organic pollutant. Studies have revealed the presence of both TCEP and its metabolites in environmental media. The neurotoxicity of TCEP has been investigated in vitro but rarely in mammals. This study aimed to determine the neurotoxic effects of TCEP on rats and to explore the possible intrinsic relationships between neurochemical alterations and the neurotoxic effects. For this, 6-week-old female SD rats were administered 50, 100, or 250 mg/kg/d TCEP daily by oral gavage for 60 days. TCEP exposure produced neurotoxicity in the female SD rats. The Morris water maze results revealed a dose-dependent decline in spatial learning and memory functions of exposed rats. In addition, pathological examination of the brain showed apoptotic and necrotic lesions in the CA1 field pyramidal cells of the hippocampus; further, rats treated with the highest TCEP dose showed inflammatory cells and calcified/ossified foci in the cortex areas. Furthermore, 1H-nuclear magnetic resonance metabolomics results revealed that TCEP exposure interfered with normal biological processes, including amino acid and neurotransmitter metabolism, energy metabolism, and cell membrane function integrity by changing the concentrations of glutamate, γ-aminobutyric acid, N-acetyl-d-aspartate, creatine, and lactic acid metabolites in the brain of treated rats. However, the changes in the concentrations of taurine, myo-inositol, creatine, and choline metabolites, which are associated with antioxidant physiological processes, might be a neuroprotective mechanism to prevent the neurotoxicity induced by TCEP. Thus, metabolomics combined with neuropathology and neurobehavioral analyses provided critical insights to investigate the TCEP-induced neurotoxic effects and mechanisms.
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  • 文章类型: Journal Article
    背景:中药(TCM)正变得越来越流行,相关的不良事件经常被忽略或低估。
    目的:本系统综述旨在评估中医肝损伤(TCM-ILI)的临床特征和结局,并评估中医-ILI在所有药物性肝损伤(DILI)中的比例。
    方法:中国国家知识基础设施,万方,VIP,PubMed,搜索了Embase数据库。人口统计,临床,和生存数据被提取和汇集。计算与较差结果相关的因素。对于比例荟萃分析,数据采用随机效应模型进行汇总.
    结果:总体而言,检索到21,027篇文章,最终包括625个。女性和老年患者占主导地位。肝移植的比例为2.18%(7/321)。死亡率为4.67%(15/321)。男性,高天冬氨酸转氨酶和直接胆红素,和低白蛋白与TCM-ILI患者死亡/肝移植风险增加显著相关.TCM-ILI在所有DILI中所占比例为25.71%。比例随年份逐渐增加。
    结论:我们的工作总结了当前有关临床表现的知识,病程,和中医-ILI的预后。中医可以导致肝毒性,甚至死亡或需要挽救生命的肝移植。应严格建立政府对中药产品的监管。
    BACKGROUND: Traditional Chinese medicine (TCM) is becoming increasingly popular and related adverse events are often ignored or underestimated.
    OBJECTIVE: This systematic review aimed to evaluate the clinical characteristics and outcomes of TCM-induced liver injury (TCM-ILI) and to estimate the proportion of TCM-ILI in all drug-induced liver injuries (DILI).
    METHODS: China National Knowledge Infrastructure, Wanfang, VIP, PubMed, and Embase databases were searched. Demographic, clinical, and survival data were extracted and pooled. Factors associated with worse outcomes were calculated. For the proportion meta-analyses, the data were pooled by using a random-effects model.
    RESULTS: Overall, 21,027 articles were retrieved, of which 625 were finally included. There was a predominance of female and older patients. The proportion of liver transplantation was 2.18% (7/321). The mortality was 4.67% (15/321). Male, higher aspartate aminotransferase and direct bilirubin, and lower albumin were significantly associated with an increased risk of death/liver transplantation in TCM-ILI patients. The proportion of TCM-ILI in all DILI was 25.71%. The proportion was gradually increased with year.
    CONCLUSIONS: Our work summarises current knowledge regarding clinical presentation, disease course, and prognosis of TCM-ILI. TCM can result in hepatotoxicity, even death or necessitate life-saving liver transplantation. Governmental regulation of TCM products should be strictly established.
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  • 文章类型: Journal Article
    BACKGROUND: Epilepsy is a common disease that is mostly treated with antiepileptic drugs (AEDs). However, the sexual dysfunction (SD) side effects related to the use of AEDs have not received sufficient attention.
    METHODS: The purpose of this review is to examine the current evidence on SD-related side effects of AEDs. The incidence, clinical features and major types of SD are summarized. Furthermore, various AEDs that may cause SDs are addressed in detail. Finally, we briefly summarize the treatments for SD related to AEDs.
    CONCLUSIONS: SD related to AEDs is common. Symptoms include erectile dysfunction (ED), hyposexuality, hypersexuality and ejaculatory dysfunction. Traditional AEDs such as valproate and enzyme-inducing AEDs (EIAEDs) may produce high incidences of decreased libido. Recently, sexual function changes related to new AEDs have been reported. Topiramate, pregabalin and gabapentin may cause SD, whereas oxcarbazepine, lamotrigine and levetiracetam may improve sexual function. Although the treatment for SD related to AEDs remains unclear, switching to another AED may be an option. Further studies are necessary to better understand and treat SD related to AEDs.
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  • 文章类型: Journal Article
    缺氧缺血(HI)脑病是残疾和死亡的常见原因,治疗选择有限。这里,我们从健康供体收集外周血单个核细胞(PB-MNCs),并在缺氧缺血(HI)后第3天通过尾静脉注射将这些细胞植入大鼠体内前,用CM-DiI标记.为了免疫抑制,在整个实验过程中,动物每天注射环孢菌素,细胞移植前24h开始。然后我们通过荧光显微镜观察了PB-MNCs,通过旋转棒和圆柱试验检查大鼠的运动功能,使用image-proplus软件测量病变体积,并通过隧道法分析HI大鼠神经细胞的凋亡。结果显示PB-MNCs可以在宿主的大脑中存活,迁移到损伤区域并表达神经标记。此外,接受PB-MNC的HI大鼠表现出运动功能障碍的减少,病变体积和神经细胞凋亡。为了更好地理解细胞迁移的机制,PB-MNCs也通过尾静脉注射到正常大鼠体内。RT-PCR和Western-blot检测正常大鼠和HI大鼠脑中基质细胞衍生因子-1(SDF-1)的表达,而PB-MNC在体外对HI或正常脑提取物的反应通过细胞迁移测定来测量。这些数据共同表明PB-MNC的迁移通过SDF-1依赖性途径被引导到受损的大脑。我们的结果表明,PB-MNCs的静脉移植可能是HI治疗的可行候选者。
    Hypoxia-ischemia (HI) encephalopathy is a frequent cause of disability and mortality with limited therapeutic options. Here, we collected peripheral blood mononuclear cells (PB-MNCs) from healthy donors and labeled them with CM-DiI before implanting these cells by tail-vein injection into rats at day 3 after hypoxia-ischemia (HI). For immune-suppression the animals received daily injections of cyclosporine throughout the experiment, commencing 24h before cell transplantation. Then we observed the PB-MNCs by fluorescent microscopy, examined motor function of rats by rotarod and cylinder tests, measured the lesion volume using image-pro plus software, and analyzed the apoptosis of neural cells in HI rats by tunnel assay. The results showed PB-MNCs could survive in the brain of hosts, migrate to the damage area and express neural marker. In addition, The HI rats that received PB-MNCs showed a reduction in motor function impairment, lesion volume and neural cell apoptosis. To better understand the mechanism of cell migration, PB-MNCs were also injected into normal rats via tail-vein. The expression of stromal cell-derived factor-1 (SDF-1) in the brain of normal and HI rats was measured by RT- PCR and western-blot, while the response of PB-MNCs in vitro to HI or normal brain extracts were measured by cell migration assay. Collectively these data suggest that the migration of PB-MNCs is directed to the damaged brain through an SDF-1-dependent pathway. Our results suggest that intravenous transplantation of PB-MNCs may be a feasible candidate for HI therapy.
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  • 文章类型: Journal Article
    表观遗传修饰可以在作物植物中以高频率发生,并且可能在DNA序列没有变化的情况下产生表型变异。DNA甲基化是一种重要的表观遗传修饰,可能通过调节基因表达导致环境诱导的表型变异。水稻光周期-热敏核雄性不育(PTGMS)系可以在花药发育过程中在较低的温度和短日(SD)条件下从不育转变为育性。到目前为止,关于水稻整个基因组中PTGMS的DNA甲基化变异知之甚少。在这项研究中,我们使用甲基化敏感扩增多态性(MSAP)方法在两种不同条件下研究了PTGMS系PA64S幼穗中DNA胞嘧啶甲基化的改变。与较低温度和SD条件下PA64S的DNA甲基化水平(生育力)相比,在PA64S(不育)中观察到更高的甲基化。胜利获得并注释了25个差别扩增片断的序列。三个甲基化片段,它们与D2,NAD7和psaA同源,通过亚硫酸氢盐测序证实,它们的表达水平也通过qPCR评估。实时定量PCR分析显示,六个选择的甲基化基因中有五个在PA64S(不育)中下调。这些结果表明,在两种不同的环境条件下,DNA甲基化可能参与了PA64S的不育-育性转变。
    Epigenetic modification can occur at a high frequency in crop plants and might generate phenotypic variation without changes in DNA sequences. DNA methylation is an important epigenetic modification that may contribute to environmentally-induced phenotypic variations by regulating gene expression. Rice Photoperiod-Thermo-Sensitive Genic Male Sterile (PTGMS) lines can transform from sterility to fertility under lower temperatures and short-day (SD) conditions during anther development. So far, little is known about the DNA methylation variation of PTGMS throughout the genome in rice. In this study, we investigated DNA cytosine methylation alterations in the young panicles of PTGMS line PA64S under two different conditions using methylation sensitive amplified polymorphism (MSAP) method. Compared with the DNA methylation level of PA64S under lower temperatures and SD conditions (fertility), higher methylation was observed in PA64S (sterility). The sequences of 25 differentially amplified fragments were successfully obtained and annotated. Three methylated fragments, which are homologous to D2, NAD7 and psaA, were confirmed by bisulfite sequencing and their expression levels were also evaluated by qPCR. Real time quantitative PCR analysis revealed that five of the six selected methylated genes were downregulated in PA64S (sterility). These results suggested that DNA methylation may be involved in the sterility-fertility transition of PA64S under two different environmental conditions.
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