磷酸钙水泥填充固定桡骨远端骨折的抗旋转生物力学研究

目的对磷酸钙水泥(CPC)填充固定桡骨远端骨折的抗旋转应力进行评价,并与传统的克氏针固定方法进行比较。方法18根人桡骨标本制备桡骨远端骨折伴骨缺损模型,随机分为三组:克氏针固定组、CPC固定组和CPC 克氏针联合固定组。设定扭转速度为5°／min,最大扭转角度为10°时停止。记录扭转刚度、10°内的最大扭矩及所对应的最大扭角。结果在10°的扭转范围内,CPC固定组、CPC 克氏针联合固定组的扭转刚度、最大扭矩均比克氏针固定组大,差异有统计学意义(P< 0．01);最大扭转角度分别为4．3°和5．0°,均比克氏针组(9．6°)小,差异有统计学意义(P<0．01)。CPC固定组与CPC 克氏针联合固定组之间的扭转刚度、最大扭矩及最大扭角差异无统计学意义(P> 0．05)。结论在旋转角度小于4°范围内,CPC的抗旋转固定强度要比克氏针大,超过这个范围,骨水泥就会发生断裂,CPC的有效固定范围比克氏针要小。     

Intravenous fate of poly(2-(dimethylamino)ethyl methacrylate)-based polyplexes

The objective of this study was to assess the in vivo fate of poly(2-(dimethylamino)ethyl methacrylate) (pDMAEMA)-based polyplexes after intravenous administration into mice. Circulation kinetics and tissue distribution in terms of plasmid localization and transfection efficiency were assessed. To gain more insight into the observed biodistribution and gene expression profile, the interaction of pDMAEMA-based polyplexes with blood components (erythrocytes and albumin) was investigated in vitro. In the case of i.v. injection of positively charged polyplexes at a dose of 30 microg DNA most of the radioactivity was found in the lungs and the liver 60 min after injection. In the case of pDMAEMA/DNA polyplexes with a negative charge, uptake occurred mainly by the liver. Administration of positively charged complexes at a 30 microg DNA dose resulted in reporter gene expression primarily in the lungs. Injection of negatively charged complexes and naked plasmid did not result in luciferase expression in any of the organs examined. In vitro turbidity experiments showed the induction of a charge dependent aggregation process upon addition of albumin to the polyplexes pointing out to the involvement of aggregate formation in the dominant lung uptake of the positively charged polyplexes. Also, incubations of polyplexes after pre-incubation with a physiological concentration of albumin with washed erythrocytes confirmed that polyplexes induce the formation of extremely large structures. This paper underlines the need for the design of systems with reduced interaction with blood components to promote the delivery of DNA to target tissues outside the lungs.     

中华长城系统治疗胸腰椎爆裂骨折

目的探讨中华长城椎弓根钉系统治疗胸腰椎爆裂骨折的优越性,并评价其临床效果。方法选择后正中入路椎管减压或单纯使用中华长城内固定系统治疗胸腰椎爆裂骨折40例。结果经3~18个月随访,椎体平均高度由术前的前34.5%和后74.5%恢复到术后的前95%和后98.5%,Cobb′s角由术前平均16.0°恢复为术后平均1.5°。对脊髓损伤的患者Frankel分级平均提高1.5级。未出现椎弓根钉松动和断裂。结论中华长城系统治疗胸腰椎爆裂骨折操作安全、固定确实、椎弓根大小设计合理,具有较明显的优越性,有待进一步临床应用观察。     

三氧化二砷对CO2气腹下小鼠肿瘤腹壁戳口种植影响的实验研究

目的 研究腹腔内注射三氧化二砷(arsenic trioxide,As2O3)对小鼠CO2气腹下肝癌H22转移的影响. 方法 昆明鼠40只(清洁级),中腹部穿刺置入1 mm套管针,自套管针注入1×106肿瘤细胞后,建立CO2气腹,压力8 mm Hg,时间30 min.术后随机分4组,每组10只,分别腹腔内注入生理盐水,1 ml;As2O3(2 mg/kg),1 ml;As2O3(4 mg/kg),1 ml;As2O3(4mg/kg)+肝素(10 U/ml),共1 ml.气腹后第3、7天测量肿瘤黏附因子(CD44)、血管内皮生长因子(vascular endothelial growth factor,VEGF)的变化;比较各组生存状态、腹围、体重变化及转移瘤直径.结果 气腹后第3、7天,与对照组相比,各As2O3组CD44、VEGF表达均明显降低(P＜0.05).2个高剂量组的气腹后第3天VEGF、第7天CD44比低剂量组降低明显(P＜0.05).4组戳口种植率分别为9/10、8/10、7/10、6/10,差异无显著性(x2=2.667,P=0.446). 结论 As2O3对CO2气腹腹腔镜肿瘤生长转移有抑制作用.     

军队在职干部腰身指数与心血管危险因素相关性探讨

目的 研究用腰身指数（腰围/身高比值WHtR）作为腹型肥胖指标探讨与心血管危险因素的相关性。方法 对2005年3月～2006年12月入住广州疗养院的军队在职干部共495人进行身高、体重、腰围、血压、心率、生化等检测,并进行统计学分析。结果 腰身指数异常组的年龄、体重、SBP、DBP、FBS、TC、TG以及尿酸均显著高于腰身指数正常组,HDL-C的结果则相反（P〈0.01～P〈0.001）;同时腰身指数与年龄、体重、SBP、DBP、FBS、TC、TG呈显著正相关,与HDL-C呈显著负相关（P〈0.05～P〈0.001）。结论 腰身指数可作为有效的腹型肥胖参考指标,腰身指数异常者其心血管危险因素水平比正常者高,及时控制腰身指数可以有效改善人群的健康状况。     

肝硬化大鼠肝部分切除术后肝再生的干预研究

目的　以肝硬化大鼠为动物模型 ,研究药物对肝硬化大鼠肝部分切除术后肝再生的影响。方法　取健康的Wistar雄性大鼠 6 4只 ,以 6 0 ?l4油溶液 0 .3ml/ 10 0 g皮下注射 ,同时饮用 5 %酒精溶液 ,4 5d后制成肝硬化动物模型。模型大鼠随机分为 4组 ,16只 /组。全麻下均行左、中叶肝切除术。术后各组按以下方案处理 :A组 (对照组 )注射生理盐水 1mg/ (kg·d) ,B组为泮托拉唑组 ,注射 0 .2mg/ (kg·d) ,C组为重组人生长激素组 ,注射 0 .5U/ (kg·d) ,D组为两药合用组 ,同时给予泮托拉唑注射 0 .2mg/ (kg·d) ,重组人生长激素注射 0 .5U/ (kg·d) ) ,连续给药 1周。抽取静脉血样 ,取肝脏组织 ,检测肝功能、有丝分裂指数 (MI)、增殖细胞核抗原 (PCNA)、细胞核DNA含量。结果　泮托拉唑组、重组人生长激素组、两药合用组MI、PCNA阳性染色细胞量、细胞核DNA含量均高于对照组 (P <0 .0 5 ) ,两药合用组MI、PCNA阳性染色细胞量、细胞核DNA含量均高于泮托拉唑组、重组人生长激素组 (P <0 .0 5 ) ,但各组间肝功能变化无明显差异。结论　泮托拉唑组及重组人生长激素均对肝硬化大鼠肝部分切除术后肝细胞再生有促进作用 ,两药联合应用肝细胞再生更明显 ,其详细机制须待进一步研究。     

强脉冲光治疗浅表(皮肤)血管瘤临床观察

目的：观察强脉冲光（IPL）治疗浅表（皮肤）血管瘤的疗效。方法：选择60例浅表（皮肤）血管瘤患者,随机分为治疗组和对照组,治疗组用535nm、580nm强脉冲光治疗皮损,每三周治疗一次,三次为一个疗程;对照组采用波长为532nm的Q开关Nd：YAG激光治疗,每两周治疗一次,三次为一个疗程。观察两组皮损的治愈率、并发症等情况,并行统计学处理。结果：治疗组皮损三次治愈率明显高于对照组（P〈0.01）,患处瘢痕形成及炎症性色素沉着发生率均低于对照组。结论：强脉冲光（IPLTM）治疗浅表（皮肤）血管瘤效果满意。     

Iron deficiency down-regulates the Akt/TSC1-TSC2/mammalian Target of Rapamycin signaling pathway in rats and in COS-1 cells

Iron deficiency (ID) is one of the most commonly known forms of nutritional deficiencies. Low body iron is thought to induce neurologic defects but may also play a protective role against cancer development by cell growth arrest. Thus, ID may affect cellular pathways controlling cell growth and proliferation, the mechanism of which is still not fully understood. The serine/threonine protein kinase Akt and its downstream target, the mammalian Target of Rapamycin (mTOR), is known to play a crucial role in the regulation of cell growth and survival. Therefore, we hypothesized that Akt/mTOR pathway could be influenced by ID. Three-week-old male Wistar-strain rats were divided into 3 groups and the 2 groups had free access to a control diet (C group) or an iron-deficient diet (D group). The third group (PF group) were pair-fed the control diet to the mean intake of the D group. After 4 weeks, rats were killed and their brains were sampled. In separate experiments, COS-1 cells were cultured with or without the iron chelator deferoxamine. Western blots of brain samples and COS-1 lysates were used to analyze the expression and phosphorylation state of Akt, TSC2, mTOR, and S6 kinase proteins implicated in the Akt/mTOR pathway. Using 2 different ID models, we show for the first time that iron deficiency depresses Akt activity in rats and in COS-1 cells, leading to a decrease in mTOR activity.     

稳定表达nucleostemin—siRNA的肿瘤细胞克隆的筛选和鉴定

目的：用脂质体法建立nucleostemin（NS）基因特异性siRNA阳性细胞克隆，为深入研究NS基因在胃癌细胞增殖调控中的作用和机制提供理想的生物学模型。方法：试剂盒法将真核表达载体PCDNA4／C—NS—silencer质粒大量扩增，然后以限制性切酶PVUI酶切线性化处理，用LipofectamineTM2000Reagent将PCDNA4／C—NS—silencer及其对照空载体转染胃癌SGC-7901细胞，经Zeocin抗生素压力筛选后用PCR方法鉴定细胞克隆外源基因整合阳性。结果：经Zeocin抗生素压力筛选后两组细胞均收获多个细胞克隆；PCR结果表明两组细胞克隆外源基因整合阳性。结论：成功建立表达NS～siRNA的胃癌SGC-7901细胞克隆。     

单蒂横行腹直肌肌皮瓣乳房再造中Ⅳ区皮瓣的取舍

目的探讨单蒂横行腹直肌肌皮瓣乳房再造术中Ⅳ区皮瓣的取舍。方法通过16例实施单蒂横行腹直肌肌皮瓣乳房再造术，术中观察皮瓣的皮色、断面出血颜色，并利用近红外血氧监测仪测定皮瓣各区的组织血氧饱和度，决定Ⅳ区皮瓣的取舍。术后观察指标包括术后并发症及美学效果。结果16例中5例Ⅳ皮瓣的肤色正常、断面出血呈鲜红色而非暗红色、组织血氧饱和度不低于Ⅲ区组织血氧饱和度的95％。在接受了保留Ⅳ区皮瓣的单蒂横行腹直肌肌皮瓣乳房再造术后，再造乳房全部成活，无严重术后并发症，患者对再造乳房均很满意。结论近红外血氧无创检测有助于决定Ⅳ区皮瓣的取舍。有选择地实施保留Ⅳ区皮瓣的单蒂横行腹直肌肌皮瓣乳房再造术，可用于大面积胸壁缺损或乳腺尾叶的修复重建。