Synthesis and evaluation of 5,7‐dichloro‐4‐(3‐{4‐[4‐(2‐[18F]fluoroethyl)‐piperazin‐1‐yl]‐phenyl}‐ureido)‐1,2,3,4‐tetrahydroquinoline‐2‐carboxylic acid as a potential NMDA ligand to study glutamatergic neurotransmission in vivo

The neurotransmitter glutamate is thought to be crucially involved in a huge number of neurological and psychiatric disorders, such as Morbus Parkinson, Alzheimer's disease and schizophrenia. Aiming at an improved diagnostic tool for PET a new [¹⁸F]fluorine labelled NMDA receptor ligand was developed that may potentially allow the in vivo visualization of glutama‐tergic neurotransmission. The ¹⁹F‐analogue trans‐5,7‐dichloro‐4‐(3‐{4‐[4‐(2‐fluoroethyl)‐piperazin‐1‐yl]‐phenyl}‐ureido)‐1,2,3,4‐tetrahydro quinoline‐2‐carboxylic acid was synthesised to determine the binding affinity, lipophilicity and biodistribution of the ligand. This substance exhibits a K_i of 12 nM for the glycine binding site using [³H]MDL‐105,519 assays on pig cortical membranes. A logD of 1.3 was determined for this compound according to the OECD guidelines employing the HPLC method. Radiosynthesis of this ligand was achieved by labelling the precursor trans‐5,7‐dichloro‐4‐[3‐(4‐piperazin‐1‐yl‐phenyl)‐ureido]‐1,2,3,4‐tetrahydroquinoline‐2‐carboxylic acid methyl ester with 2‐[¹⁸F]fluoroethyltosylate and subsequent cleaving of the methyl ester moiety, resulting in an overall decay corrected yield of 35% of the final product trans‐5,7‐dichloro‐4‐(3‐{4‐[4‐(2‐[¹⁸F]fluoroethyl)‐piperazin‐1‐yl]‐phenyl}‐ureido)‐1,2,3,4‐tetrahydroquinoline‐2‐carboxylic acid. The biodistribution kinetics of this compound were determined with Sprague Dawley rats ex vivo for brain, liver, kidney, and bone. The ligand showed a maximum brain uptake 30 min.p.i. of about 0.1% ID/g. Copyright © 2003 John Wiley & Sons, Ltd.     

Biological activity of silylated amino acid containing substance P analogues

Abstract: The need to replace natural amino acids in peptides with nonproteinogenic counterparts to obtain new medicinal agents has stimulated a great deal of innovation on synthetic methods. Here, we report the incorporation of non‐natural silylated amino acids in substance P (SP), the binding affinity for the two hNK‐1 binding sites and, the potency to stimulate phospholipase C (PLC) and adenylate cyclase of the resulting peptide. We also assess the improvement of their stability towards enzyme degradation. Altogether, we found that replacing glycine with silaproline (Sip) in position 9 of SP leads to a potent analogue exhibiting an increased resistance to angiotensin‐converting enzyme hydrolysis.     

天津市双口生活垃圾卫生填埋场渗沥液处理

介绍了天津市双口生活垃圾卫生填埋场渗沥液处理情况，对渗沥液处理场运行中出现的一些现象做了初步分析。     

建筑工地外来务工人员心理卫生状况调查

目的 :了解建筑工地外来务工人员的心理卫生状况 ,为预防心理疾病 ,增进身心健康提供依据。方法 :采用症状自评量表 (SCL - 90 )对建筑工地外来务工人员 5 18人的心理卫生状况进行评价。结果 :9个因子分与中国常模比较差异均有显著性 (P<0 .0 1) ,且各年龄组与中国常模比较差异也有显著性 ,均低于常模 ;各因子分在不同年岭 ,不同文化的建筑工地外来务工人员间比较差异无显著性。研究还发现做事“必须反复检查”、“必须反复洗手、点数目或触摸某些东西”、“做事必须做得很慢以保证做得正确”等强迫症状是建筑工地外来务工人员中较常见的阳性项目。结论 :建筑工地外来务工人员强迫症状发生频率较其它症状高 ,应加强其心理卫生教育     

Placental site trophoblastic tumor in a patient with brain and lung metastases

Placental site trophoblastic tumor is a rare neoplasm that arises from intermediate trophoblasts and shows diversity of biological behaviors, resulting in the absence of consistency in treatment modalities. A case of placental site trophoblastic tumor that extended to the cervix, with primary manifestation of amenorrhea and yellow foul-smelling vaginal discharge, is presented. Total abdominal hysterectomy was performed initially, and serial measurements of human chorionic gonadotropin levels were obtained. She was admitted with metastases to brain and lung 1.5 years after surgery. Combination chemotherapy (etoposide-methotrexate-dactinomycin/cyclophosphamide-vincristine) and radiotherapy were administered. There was no significant response to chemoradiotherapy. Despite changing chemotherapy regimen, she is still alive with progressive disease.     

抑制JAK/STAT通路对培养乳鼠心肌细胞模拟缺血/再灌注损伤的作用

目的研究抑制Janus激酶/信号转导和转录激活子(JAK/STAT)通路对乳鼠心肌细胞缺血再灌注损伤的保护作用。方法采用体外培养的新生大鼠心肌细胞造成缺血再灌注(I/R)模型,随机分为正常对照组,缺血再灌注组,JAK抑制剂-AG490治疗组,STAT抑制剂-RMP治疗组。采用MTT法检测心肌细胞活性,检测以上不同条件下细胞上清液中的乳酸脱氢酶(LDH)、丙二醛(MDA)、超氧化物歧化酶(SOD)含量,并检测各组细胞的凋亡率。结果与正常对照组相比,缺血再灌组心肌细胞成活率明显降低(P<0.01),细胞上清液中LDH、MDA含量明显升高(P<0.01),SOD活力则显著降低(P<0.01),缺血再灌组凋亡率升高明显(P<0.01)。AG490及RMP处理后,心肌细胞成活率明显升高(P<0.01),LDH、MDA显著低于缺血再灌组(P<0.01),SOD则高于缺血再灌组(P<0.01)。结论抑制JAK/STAT通路有助于减轻缺血再灌注所致心肌损伤。     

子宫颈癌HPV16/18感染与微血管密度和血管内皮生长因子表达的关系

目的 探讨人乳头状瘤病毒16／18（HPV16／18）在子宫颈癌组织中的感染情况及与微血管密度（MVD）和血管内皮生长因子（VEGF）表达的关系。方法 用原位杂交法检测HPV16／18在60例子宫颈癌（鳞癌40例、腺癌20例）、29例宫颈上皮内肿瘤（CIN）和16例正常子宫颈组织中的HPV16／18感染情况；采用免疫组织化学方法（SP）检测VEGF蛋白的表达，并以CD34抗原作为血管内皮细胞标记，测定其微血管密度。结果 HPV16／18在子宫颈鳞癌、腺癌、CIN和正常子宫颈组织中感染率分别为67．50％（27／40）、35．00％（7／20）、68．97％（20／29）、6．25％（1／16）。HPV16／18感染率鳞癌组与腺癌组和正常组比较差异均有显著性意义（均P〈0．01），而鳞癌组与CIN组相比差异无显著性意义（P〉0．05）。随着宫颈病变的进展，MVD逐渐增大，VEGF的阳性表达率渐增高。MVD在以上5种组织间相比差异均有极显著性意义（均P〈0．01）。VEGF在子宫颈鳞癌、腺癌、CIN、正常宫颈组织细胞质中的阳性表达率分别为95．00％（38／40）、100．00％（20／20）、82．80％（24／29）、18．80％（3／16）。病变患者与正常者相比差异有极显著性意义（P〈0．01）。HPV16／18感染与VEGF表达呈正相关（r=0．245，P〈0．05），而与MVD无相关性（r=．04，P〉0．05）；VEGF的表达与MVD无相关性（r=0．01，P〉0．05）。淋巴转移阳性者MVD的表达量较阴性者高（P〈0．05）。结论 在子宫颈癌的发生发展中HPV16／18的感染起一定的作用，MVD与VEGF在子宫颈组织的不同病变中的表达均有差异性，推测VEGF有促进子宫颈癌组织血管形成作用，MVD与子宫颈癌的恶性程度密切相关。HPV16／18感染可能通过促进VEGF的表达而有利于子宫颈癌组织的生长。     

基于网络药理学和分子对接技术探讨石菖蒲治疗缺血性脑卒中的作用机制

目的:借助网络药理学和分子对接技术研究石菖蒲治疗缺血性脑卒中(CIS)的作用机制.方法:以"石菖蒲"为关键词在中药系统药理学数据库与分析平台(TCMSP)检索其活性成分和作用靶点,利用Uniprot数据库对靶点蛋白信息进行标准化,构建中药、成分、靶点网络.利用GeneCards、TTD、OMIM和DRUGBANK 4个...     

基于分子对接技术虚拟筛选延胡索抗心肌缺血物质基础研究

目的研究延胡索抗心肌缺血的物质基础及作用机制。方法通过TCMSP平台筛选到符合条件的目标小分子化合物,运用Maesrto11.1分子对接软件筛选延胡索中与相应靶点蛋白对接较好的小分子化合物,再运用Cytoscape3.6.1构建多成分-靶点网络药理图,通过拓扑学分析,阐释其网络特征。结果在16种心肌缺血靶点对接结果中,8种季铵碱化合物、1种黄酮类、2种叔胺碱类显示出了较好的对接结果。季铵碱类化合物和黄酮类槲皮素对接结果普遍优于叔胺碱类,对接结果中季铵碱打分平均值高于叔胺碱的靶点蛋白有10种。网络药理学结果分析得知多化合物-靶点的网络异质性为0.57,平均相邻节点数3.59,特征网络长度3.02,网络中心度0.21。结论延胡索季铵碱类化合物黄连碱、巴马汀、去氢紫堇鳞茎碱、药根碱、非洲防己碱、小檗碱,黄酮类槲皮素可能是其治疗心肌缺血的物质基础,延胡索治疗心肌缺血是多成分与多靶点相互作用的结果。