^18F-FECNT的生物分布特性及小动物PET显像研究

目的探讨多巴胺转运蛋白（DAT）显像剂^18F-N-（2-氟乙基）-2β-甲酯基-3β-（4-氯苯基）去甲基托烷（FECNT）的体内生物分布特性,并进行小动物PET显像研究,以评价其临床应用潜力。方法自制^18F-FECNT注射液,进行正常小鼠脑内分布、DAT阻断实验、正常和单侧帕金森病（PD）模型大鼠小动物PET脑显像。结果正常ICR小鼠在给药后5,15,30,60,120,180min的进脑量分别达2．22,1．20,1．02,0．78,0．71,0．67百分注射剂量率（％ID）。给药后5～60min内,药物在纹状体（ST）部位浓聚,纹状体／小脑（ST／CB）比值在5,15,30,60min时分别为2．56,3．47,2．78,1．63。120min后ST的放射性浓度下降至与其他脑组织相近。脑内DAT经β-CFF阻断的小鼠,其ST未见放射性浓聚。正常大鼠小动物PFT显像图中ST显影清晰（ST／CB=2．18±0．16,n=3）,双侧对称;PD模型大鼠未损毁侧ST放射性浓聚（ST未损毁侧／CB=2．01±0．23,n=3）,而损毁侧ST放射性摄取不明显,与小脑相当（ST损毁侧／CB=1．04±0．05）。结论^18F-FECNT能透过无损的血脑屏障浓聚于ST,对DAT具有高亲和性与特异性,是一种有临床应用潜力的DAT显像剂。     

促红细胞生长素对充血性心衰患者心功能的影响

目的探讨充血性心衰(CHF)并贫血的患者,在EPO加铁剂治疗后,对心脏结构与功能及B型利钠肽水平的影响。方法32例连续CHF并贫血(80g/L<血红蛋白<120g/L)的患者纳入本研究。以随机方法分为治疗组(A组、16例),皮下注射EPO12000IU/周+每天口服铁剂共4个月。对照组(B组、16例),每天口服铁剂。结果A组患者在随机治疗的4个月中,相对于基础状态血红蛋白增加(P<0.001),左室内径缩小(P<0.001),射血分数增加(P<0.05),心功能分级(P<0.001)与6min步行试验(P<0.05)改善,同时血浆中B型利钠肽水平(P<0.01)下降。B组患者在试验期间射血分数(P<0.05)及6min步行距离(P<0.05)有所下降,其他指标无明显变化。结论CHF并贫血患者,EPO加口服铁剂治疗,能改善患者的心脏结构与功能,降低B型利钠肽水平。     

百色市不同职业暴露因素工人肝功能异常状况及其影响因素分析

目的:了解百色市不同职业暴露因素工人肝功能异常状况及影响因素,为制定合理的健康监护和采取有效的防护措施提供科学依据.方法:收集2019年1～12月百色市11106例职业工人的个人基本资料及肝功能职业健康检查数据,采用SPSS 21.0统计软件对数据进行分析.结果:11106例职业工人中男9043例(81.42％),女2...     

灯盏花的化学成分研究

自灯盏花 [Erigeronbreviscapus(Vant.)Hand . Mazz .]全草乙醇提取物中分离得到 7个化合物 ,经理化性质和光谱分析分别鉴定为 :芹菜素 (1) ;山奈酚 (2 ) ;对羟基苯甲酸 (3) ;3 ,4 二羟基苯甲酸 (4 ) ;槲皮素 (5 ) ;木犀草素 (6 ) ;4′ 羟基黄芩素 (7)。其中山奈酚和槲皮素是首次从该植物中分离得到。     

18F-FECNT的生物分布特性及小动物PET显像研究

Objective 2β-carbomethoxy-3β-(4-corophenyl)-8-(2-18F-fluoroethyl) nortropane (18F-FECNT) is a recently developed dopamine transporter (DAT) imaging agent. The aim of this study was to evaluate its brain biedistribution and to assess its usefulness in quantitation of DAT density in normal and hemiparkinsonian rats. Methods Six groups of mice (5 mice each group) received 18F-FECNT were sacri-ficed at indicated time post injection. Different brain regions (cortex, hippocampus, striatum, cerebellum) were removed, weighed, and countered. DAT blocking effect was investigated in mice pretreated with 2β-Carbomethoxy-3β-(4-fluorpbenyl)tropane (β-CFT) at before 18F-FECNT injection. MicroPET scans were performed in beth normal and unilaterally 6-hydroxydopamine-lesioned rats. Results The brain uptake of 18F-FECNT was 2.22, 1.20, 1.02, 0.78, 0.71, and 0.67 percent injection dose (%ID) at 5, 15, 30, 60, 120, and 180 min post injection. Radioactivity concentration of the striatum, the target region, was the highest in the brain regions and decreased quickly from 5 to 60 min and reached to background at 120 min of post injection. The striatum/cerebellum ratio was 2.56, 3.47, 2.78, 1.63, 0.97, and 0.88 at 5, 15, 30, 60, 120, and 180 min, respectively, post injection. The selective striatum uptake of 18F-FECNT decreased dramatically to the background when the DAT was blocked with β-CFT. The striatum of normal rats in micro-PET exhibited symmetrical (left/right = 1.00±0.05) and the highest uptake of radioactivity (striatum/cere-helium =2.18±0. 16 at 5- 125 min, n =3). As for the hemiparkinsonian rats, nonsymmetrical [unlesioned striatum/cerebellum vs lesioned striatum/cerebellum = 2.01 ± 0.23 (n = 3) vs 1.04 ± 0. 05] and the high-est uptake of radioactivity were also noted. Conclusions The results suggest that 18F-FECNT rapidly pas-ses through blood-brain barrier and locates in stiatal region with high affinity and selectivity to DAT. It is a potential radiotracer to assess the in vivo DAT density in Parkinson's disease.     

18F-FECNT的生物分布特性及小动物PET显像研究

Objective 2β-carbomethoxy-3β-(4-corophenyl)-8-(2-18F-fluoroethyl) nortropane (18F-FECNT) is a recently developed dopamine transporter (DAT) imaging agent. The aim of this study was to evaluate its brain biedistribution and to assess its usefulness in quantitation of DAT density in normal and hemiparkinsonian rats. Methods Six groups of mice (5 mice each group) received 18F-FECNT were sacri-ficed at indicated time post injection. Different brain regions (cortex, hippocampus, striatum, cerebellum) were removed, weighed, and countered. DAT blocking effect was investigated in mice pretreated with 2β-Carbomethoxy-3β-(4-fluorpbenyl)tropane (β-CFT) at before 18F-FECNT injection. MicroPET scans were performed in beth normal and unilaterally 6-hydroxydopamine-lesioned rats. Results The brain uptake of 18F-FECNT was 2.22, 1.20, 1.02, 0.78, 0.71, and 0.67 percent injection dose (%ID) at 5, 15, 30, 60, 120, and 180 min post injection. Radioactivity concentration of the striatum, the target region, was the highest in the brain regions and decreased quickly from 5 to 60 min and reached to background at 120 min of post injection. The striatum/cerebellum ratio was 2.56, 3.47, 2.78, 1.63, 0.97, and 0.88 at 5, 15, 30, 60, 120, and 180 min, respectively, post injection. The selective striatum uptake of 18F-FECNT decreased dramatically to the background when the DAT was blocked with β-CFT. The striatum of normal rats in micro-PET exhibited symmetrical (left/right = 1.00±0.05) and the highest uptake of radioactivity (striatum/cere-helium =2.18±0. 16 at 5- 125 min, n =3). As for the hemiparkinsonian rats, nonsymmetrical [unlesioned striatum/cerebellum vs lesioned striatum/cerebellum = 2.01 ± 0.23 (n = 3) vs 1.04 ± 0. 05] and the high-est uptake of radioactivity were also noted. Conclusions The results suggest that 18F-FECNT rapidly pas-ses through blood-brain barrier and locates in stiatal region with high affinity and selectivity to DAT. It is a potential radiotracer to assess the in vivo DAT density in Parkinson's disease.     

儿童桡尺骨远端掌背重叠移位骨折的手法整复

我们自 1996年至 1999年采用以远折端为支点行折顶回旋连贯手法复位小夹板外固定治疗 34例 ,效果满意 ,现报告如下。1　临床资料本组 34例 ,男 2 6例 ,女 8例 ;年龄 7～ 14岁 ,平均 10岁。伤后就诊时间 30分钟至 2天。均为闭合性骨折 ,无合并其它部位骨折及血管神经损伤。Ｘ线表现为桡尺骨远端双骨折 ,为短斜形 ;桡骨远折端掌面与近折端的背面形成掌背重叠 ,重叠程度在 1 5ｃｍ～ 0 5ｃｍ ,平均 1 0ｃｍ ;2 8例呈几乎平行式重叠 ,6例呈成角重叠 ,其中最大成角为 30°。2　治疗方法2 1　手法复位　患儿取坐位或仰卧位 ,坐位时肩关节前屈 ,…     

人巨细胞病毒感染与脑梗死患者血管病变关系及可能机制的探讨

目的探讨人巨细胞病毒(HCMV)感染与脑梗死患者血管病变关系的可能机制。方法选择首发脑梗死患者101例,根据实验室检查结果分为HCMV阴性组(59例)、HCMV阳性组(42例),同期选择健康体检的HCMV抗体阴性者40例为对照组。检测颈动脉内膜中层厚度(IMT)、HCMV抗体、脂联素、白细胞介素6(IL-6)水平,比较3组IMT、脂联素、IL-6水平。结果HCMV阳性组患者的IMT与其他2组比较有统计学差异(P<0.01);脂联素较其他2组明显降低(P<0.01);IL-6较其他2组明显升高(P<0.01);脂联素与IL-6呈负相关(r=-0.455,P<0.001);IMT与IL-6呈正相关(r=0.339,P<0.001)。结论HCMV感染可能通过升高血清IL-6水平,降低脂联素水平,促进动脉粥样硬化形成、从而诱发脑梗死。     

喹诺酮类药物的耐药、联合用药及不良反应分析

目的对喹诺酮类药物联合用药与耐药性,以及不良反应进行探讨分析。方法对本院应用喹诺酮类药物治疗出现不良反应的200例患者临床资料进行回顾性分析。结果患者不良反应多发生于神经系统（60例,30.0%）、全身性损害（50例,25.0%）,以及皮肤与其附件的损害（43例,21.5%）,患者局部用药与口服所致的不良反应较肌内注射与静脉注射少,差异具有统计学意义（P〈0.05）。结论喹诺酮类药物需合理使用,并严格掌握其临床适应证与禁忌证,以及其单独用药和联合用药的剂量,尽可能避免联合用药的不合理性,同时需明确患者不良反应的发生机制,以有效降低患者不良反应的发生率。     

非核糖体肽类化合物的组合生物合成策略研究进展

很多微生物能够利用非核糖体肽合酶合成结构复杂、种类繁多、生物活性多样的小分子肽类化合物.组合生物合成是对控制抗生素生物合成的基因簇进行阻断、置换、重组或异源表达等遗传操作,从而达到利用生物技术和环境友好的手段构建化合物衍生物库的目的.组合生物合成在增加天然活性化合物的数量,改良天然化合物的生物学活性,提高天然化合物的产量,开发创新药物和酶制剂等领域都具有重要应用价值.近年来,非核糖体肽的组合生物合成研究取得了重要进展.本文就非核糖体肽合酶的组合生物合成研究策略,从模块定点突变、替换、插入、删除、模块“洗牌”与异源表达等角度进行了综述.