染料木黄酮对前列腺癌细胞增殖、迁移和侵袭的影响及机制

本研究拟探讨染料木黄酮对前列腺癌细胞LNCaP和CWR22RV1的增殖、迁移和侵袭能力的影响。一、材料与方法1.材料:前列腺癌细胞株LNCaP和CWR22RV1(中国科学院上海生命科学研究院);Genistein(天津科瑞泰科技有限公司);RPMI 1640、胎牛血清(FBS)、胰蛋白酶(美国Gibco公司);E-钙黏蛋白(E-cadherin)、N-钙黏蛋白(N-cadherin)、波形蛋白(Vimentin,Abcam公司);聚氰基丙烯酸正丁酯(BCA)试剂盒、十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)上样缓冲液(×5)及蛋白质印迹法(Western blot)试剂盒(上海市碧云天生物公司);2.实验方法:采用噻唑蓝(MTT)实验、划痕实验和Transwell实验检测Genistein对细胞增殖、迁移及侵袭能力的影响。采用Western blot检测E-cadherin、N-cadherin、Vimentin、CD44和Oct-4的表达水平。     

中药复方配伍的研究方法及其进展

中药复方是由2味或2味以上中药遵循中医理论组合而成的方剂。多味中药在合适的剂量配比之下,协同发挥作用,实现中医的整体调节治疗。研究中药复方的配伍对推动中药现代化发展、新药开发以及临床应用有着重要意义。近年来,研究者们在传统的"七情和合"与"君臣佐使"的基础上,运用新技术和新方法对中药复方的成分、药效活性和药代动力学性质等进行了研究,从不同角度探讨了中药复方配伍的科学内涵。同时,多种数理方法和模型的建立、网络药理学和数据挖掘方法的发展与应用,也对中药复方配伍研究提供了很大帮助。研究方法的发展虽促进了中药复方配伍的科学研究,但还需进一步建立适合中药复方配伍复杂关系的研究方法,以阐明中药复方及其成分/组分配伍的内在规律,进而构建新的现代中药复方,这也是目前中药复方配伍研究的重点任务。     

小汤山地区0-3岁儿童喂养情况及母亲孕期贫血情况与贫血的关系

目的了解北京市小汤山地区儿童贫血分布情况,并指出合理化预防措施。方法采用日本产西斯美康xs-800i全血细胞分析仪,检测0-3岁儿童末梢血的血红蛋白含量。结果 2013年儿保门诊0~3岁儿童体检人数为1334人,其中贫血患儿为176名,贫血的发病率是13.19%。其中,本地儿童616人,贫血发病率是9.42%;流动儿童718人,贫血发病率是16.43%,二者间有统计学差异(P0.01);男性儿童贫血发病率为13.02%,女性贫血发病率13.46%,二者间无统计学差异(P0.01);6个月-1岁儿童贫血发病率为35.79%,1-2岁为4.48%,2-3岁为2.61%,三组间有统计学差异(P0.01),纯母乳喂养儿童贫血人数为47人,贫血的发病率是6.15%,混合喂养儿童贫血人数为29人,贫血的发病率是8.19%,人工喂养喂养儿童贫血人数为100人,贫血的发病率是46.30%,三者差异存在统计学意义(P0.01);母孕期贫血儿童贫血人数为97人,贫血的发病率是18.29%,母孕期无贫血儿童贫血人数为79人,贫血的发病率是10.75%,三者差异存在统计学意义(P0.01)。结论本地区0~3岁儿童贫血患病比6个月-1岁儿童显著增高,流动儿童比本市儿童贫血患病率显著增高,此外母孕期贫血及婴儿喂养方式的不同也是影响儿童贫血的原因,加强流动儿童管理,正确指导6个月后婴儿家长的喂养方法及加强预产妇孕期营养指导应成为今后工作的重点。     

Rural–urban disparities in knowledge,behaviors, and mental health during COVID-19 pandemic: A community-based cross-sectional survey

To examine the knowledge level, behaviors, and psychological status of the Chinese population during the COVID-19 pandemic, and to explore the differences between urban and rural areas.We carried out a cross-sectional survey of the knowledge, behaviors related to COVID-19, and mental health in a probability sample of 3001 community residents in 30 provinces or districts across China from February 16–23, 2020. Convenience sampling and a snowball sampling were adopted. We used General Anxiety Disorder (GAD), the 9-item Patient Health Questionnaire (PHQ-9), and knowledge and behaviors questionnaire of community residents regarding COVID-19 designed by us to investigate the psychological status, disease-related knowledge, and the behavior of Chinese urban and rural residents during the pandemic.The average score of anxiety and depression among urban residents was 9.15 and 11.25, respectively, while the figures in rural areas were 8.69 and 10.57, respectively. There was a statistically significant difference in the levels of anxiety (P < .01) and depression (P < .01). Urban participants reported significantly higher levels of knowledge regarding COVID-19 in all aspects (transmission, prevention measures, symptoms of infection, treatment, and prognosis) (P < .01), compared to their rural counterparts. While a majority of respondents in urban areas obtained knowledge through WeChat, other apps, and the Internet (P < .01), residents in rural areas accessed information through interactions with the community (P < .01). Urban residents fared well in exchanging knowledge about COVID-19 and advising others to take preventive measures (P < .01), but fared poorly in advising people to visit a hospital if they displayed symptoms of the disease, compared to rural residents (P < .01). Regression analysis with behavior showed that being female (OR = 2.106, 95%CI = 1.259–3.522), aged 18 ≤ age < 65 (OR = 4.059, 95%CI = 2.166–7.607), being satisfied with the precautions taken by the community (OR = 2.594, 95%CI = 1.485–4.530), disinfecting public facilities in the community (OR = 2.342, 95%CI = 1.206–4.547), having knowledge of transmission modes (OR = 3.987, 95%CI: 2.039, 7.798), symptoms (OR = 2.045, 95%CI = 1.054–4.003), and outcomes (OR = 2.740, 95%CI = 1.513–4.962) of COVID-19, and not having anxiety symptoms (OR = 2.578, 95%CI = 1.127–5.901) were positively associated with affirmative behavior in urban areas. Being married (OR = 4.960, 95%CI = 2.608–9.434), being satisfied with the precautions taken by the community (OR = 2.484, 95%CI = 1.315–4.691), screening to ensure face mask wearing before entering the community (OR = 8.809, 95%CI = 2.649–19.294), and having knowledge about precautions (OR = 4.886, 95%CI = 2.604–9.167) and outcomes (OR = 2.657, 95%CI = 1.309–5.391) were positively associated with acceptable conduct in rural areas.The status of anxiety and depression among urban residents was more severe compared to those living in rural areas. There was a difference in being positively associated with constructive behaviors between rural and urban areas.     

液相色谱串联质谱法检测肝癌细胞N6- 甲基腺嘌呤核苷甲基化水平

目的 建立同时测定N⁶-甲基腺嘌呤核苷(m⁶A)和腺嘌呤核苷(A)的液相色谱-串联质谱法(LC-MS/MS),检测肝癌细胞m⁶A甲基化水平。方法 HepG₂和L₀₂细胞mRNA经分离、消化为核苷,再经含对乙酰氨基酚为内标的甲醇沉淀处理。色谱柱为Agilent Proshell 120 EC-C₁₈柱,流动相为0.1 g/dl甲酸水-甲醇(82:18),流速0.4 ml/min,柱温为30 ℃。质谱检测模式为多反应监测(DMRM)模式,测定m⁶A和A的浓度,计算细胞m⁶A甲基化水平。 结果 建立的LC-MS/MS法检测m⁶A和A的浓度分别在0.15～50.00 ng/ml和1.50～500.00 ng/ml浓度范围内线性关系良好(r > 0.999),日内、日间精密度均小于15.00 %,准确度为93.67 %～101.10 %,回收率为91.46 %～97.60 %,基质效应为90.26 %～99.27 %,样品稳定性良好。HepG₂和L₀₂细胞m⁶A甲基化水平分别为(0.73 ± 0.11)%和(1.26 ± 0.22)%。结论 该方法准确、快速、稳定和灵敏,可用于检测肝癌细胞m⁶A甲基化水平。