肺炎支原体肺炎患儿支气管肺泡灌洗液中肺炎支原体耐药基因和13种病原检测结果分析北大核心CSCD

目的:了解肺炎支原体肺炎(MPP)患儿支气管肺泡灌洗液(BALF)中肺炎支原体(MP)耐药基因和13种呼吸道病原的分布情况。方法:回顾性选择2018年1月至2019年1月北京大学第三医院和北京大学第一医院100例MPP患儿的BALF标本,采用荧光定量PCR法检测MP核酸及其耐药基因,采用多重PCR核酸检测技术测定甲型流感病毒、甲型流感病毒H_(1)N_(1)、甲型流感病毒H_(3)N_(2)、乙型流感病毒、人副流感病毒、腺病毒、人博卡病毒、人鼻病毒、肺炎衣原体、人偏肺病毒、MP、人冠状病毒和呼吸道合胞病毒核酸,采用 χ^(2)检验进行分析。 结果:100例BALF标本,荧光定量PCR法检测MP及耐药基因,83例(83.00%)MP阳性,其中78例(93.98%)耐药,均为23S rRNA结构域V区A2063G的点突变。多重PCR法检测13种呼吸道病原,89例(89.00%)阳性。79例(79.00%)检测到MP,其中74例(74.00%)仅检出MP,5例(5.00%)同时检出MP合并其他病原。10例(10.00%)检测出其他病原。0~4岁组病毒检出率高于>4~6岁组( P=0.042)和>6岁组( P=0.002),差异均有统计学意义。 结论:MPP患儿的BALF标本绝大部分可检测到MP,耐药现象严重,以A2063G的点突变为主。少数BALF标本中可检测到其他呼吸道病原和2种或3种病原。     

新天然来源抗生素-抗霉素A_(18)的抗肿瘤活性及其产生菌I07A-01824的生物学特征

目的检测抗霉素A18的体外抗肿瘤活性并对其产生菌I07A-01824的形态及培养特征,生理生化特征等进行研究。方法用MTT法检测抗霉素A18的肿瘤细胞生长抑制作用,用流式细胞术测定其对细胞周期的影响;按分类学常规方法研究菌株I07A-01824的形态及部分生理生化特征。结果抗霉素A18能够抑制人肝癌细胞HepG2、人口腔上皮癌细胞KB的生长;这两个细胞株均被阻滞在细胞周期的S期。菌株I07A-01824的形态及培养特征与已知种——黄白链霉菌(Streptomyces albidoflavus)一致。结论红树林内生放线菌是新抗生素的重要来源。     

Resistin induces insulin resistance, but does not affect glucose output in rat-derived hepatocytes

AIM: The aim of the present study was to observe the effects of resistin on insulin sensitivity and glucose output in rat-derived hepatocytes. METHODS: The rat hepatoma cell line H4IIE was cultured and stimulated with resistin; supernant glucose and glycogen content were detected. The insulin receptor substrate (IRS)-1 and IRS-2, protein kinase B/Akt, glycogen synthase kinase-3beta(GSK-3 beta), the suppressor of cytokine signaling 3 (SOCS-3) protein content, as well as the phosphorylation status were assessed by Western blotting. Specific antisense oligodeoxynucleotides directed against SOCS-3 were used to knockdown SOCS-3. RESULTS: Resistin induced insulin resistance, but did not affect glucose output in rat hepatoma cell line H4IIE. Resistin attenuated multiple effects of insulin, including insulin-stimulated glycogen synthesis and phosphorylation of IRS, protein kinase B/Akt, as well as GSK-3beta. Resistin treatment markedly induced the gene and protein expression of SOCS-3, a known inhibitor of insulin signaling. Furthermore, a specific antisense oligodeoxynucleotide directed against SOCS-3 treatment prevented resistin from antagonizing insulin action. CONCLUSION: The major function of resistin on liver is to induce insulin resistance. SOCS-3 induction may contribute to the resistin-mediated inhibition of insulin signaling in H4IIE hepatocytes.     

山莨菪碱对沙土鼠脑缺血后延迟性神经元死亡的影响

目的　研究山莨菪碱对沙土鼠脑缺血后海马延迟性神经元死亡的影响并探讨其与纹状体多巴胺和 Ａ Ｔ Ｐ 含量变化的关系。方法　制备沙土鼠前脑缺血再灌注模型,脑缺血１０ ｍｉｎ 。３２ 只沙土鼠随机分为假手术组、脑缺血组、脑缺血再灌注组和山莨菪碱组。应用病理检查判断脑缺血后延迟性神经元死亡情况,高效液相测定纹状体 Ａ Ｔ Ｐ 和多巴胺的含量。结果　脑缺血组沙土鼠纹状体 Ａ Ｔ Ｐ 和多巴胺含量明显低于假手术组。在再灌注６０ ｍｉｎ 时,山莨菪碱组沙土鼠纹状体多巴胺和 Ａ Ｔ Ｐ 含量明显高于脑缺血再灌注组［ 多巴胺：（５９ ±１０） ｖｓ （３５ ±１４） ｍｇ·ｋｇ － １ , Ｐ＜ ００１ ; Ａ Ｔ Ｐ：（０８２ ±０１２） ｖｓ （０６２ ±０１０） ｍ ｍｏｌ·ｋｇ－ １ , Ｐ＜ ００５］ 。山莨菪碱组沙土鼠脑缺血后海马 Ｃ Ａ１ 区延迟性神经元死亡数目明显少于脑缺血再灌注组。结论　山莨菪碱可明显减少沙土鼠脑缺血后延迟性神经元死亡数目,机制可能与其减少脑缺血再灌注期间纹状体多巴胺释放和促进 Ａ Ｔ Ｐ 含量恢复的作用有关     

2011年版《英国药典》概览

目的简要介绍《英国药典》2011年版的基本情况、编排结构。方法分析比较了《英国药典》2011年版和2010年版的不同。结果与结论英国药典委员会每年都对《英国药典》进行更新和修订,值得学习和借鉴。     

环孢素A的血药浓度监测(HPLC)法的改进

改进环孢素A（CsA）的高效液相色谱法（HPLC）测定方法。方法：全血经乙醚提取后,吹干,用甲醇、稀HCI定容,正己烷脱脂后进样。流动相为乙腈：水（100：20）,色谱法为YWG-C184.6×150mm,检测波长为214nm。结果：CsA与CsD峰分离效果良好,最低检测限为5ng（信噪比是2.65）,最低检测浓度为10μg·L-1。提取步骤少,方法简便、快捷。结论：本方法适用于临床器官移植中CsA的大量快速的样本测定。     

Effects of population aging on the mortality burden of related cancers in urban and rural areas of China, 2004–2017: a population-based study

Objective: China is a developing country with urban–rural disparities and accelerating population aging. Therefore, quantifying the effects of population aging on the cancer mortality burden is urgently needed.Methods: Using data from China’s death surveillance datasets(2004–2017), we decomposed and quantified the effects of population aging and factor variations on cancer mortality rates in urban and rural China during 2004–2017 through a decomposition method. R ratios were used to assess the e...     

Somatic copy number alterations are predictive of progression-free survival in patients with lung adenocarcinoma undergoing radiotherapy

Objective: Lung cancer is the most common cause of cancer-related deaths worldwide. Somatic copy number alterations(SCNAs) have been used to predict responses to therapies in many cancers, including lung cancer. However, little is known about whether they are predictive of radiotherapy outcomes. We aimed to understand the prognostic value and biological functions of SCNAs.Methods: We analyzed the correlation between SCNAs and clinical outcomes in The Cancer Genome Atlas data for 486 patients wit...     

Feasibility of sentinel lymph node biopsy omission after integration of 18F-FDG dedicated lymph node PET in early breast cancer:a prospective phase Ⅱ trial

Objective:Sentinel lymph node biopsy(SLNB) is currently the standard of care in clinically node negative(cN0) breast cancer.The present study aimed to evaluate the negative predictive value(NPV) of ¹⁸F-FDG dedicated lymph node positron emission tomography(LymphPET) in cN0 patients.Methods:This was a prospective phase II trial divided into 2 stages(NCT04072653).In the first stage,cN0 patients underwent axillary LymphPET followed by SLNB.In the second stage,SLNB was omitted in patients ...     

TM6SF2在非酒精性脂肪肝病中的研究进展

非酒精性脂肪肝病（nonalcoholic fatty liver disease,NAFLD）是一类慢性肝脏疾病,以肝脏中甘油三酯（triglycerides,TG）异常积聚为特征,其发病率逐年增加,是目前最常见的肝脏疾病。跨膜6超家族成员2(transmembrane 6 superfamily member 2,TM6SF2)属于跨膜蛋白超家族成员,大量研究证实TM6SF2在NAFLD的发生发展中起重要作用。本文就TM6SF2在NAFLD中的作用及可能机制进行综述。