n-HA/PA66复合生物活性融合器在颈椎病前路减压融合术中的初步应用研究

分析52例颈椎病行前路减压、n-HA/PA66复合生物活性融合器植骨、钛钉板系统内固定颈椎前路重建手术患者的临床资料,探讨自行研制的纳米羟基磷灰石/聚酰胺66(n-HA/PA66)复合生物活性融合器在颈椎病前路减压固定融合手术中的初步临床疗效。所有术后均获得6～25个月(平均13个月)的随访。患者术前症状均得到改善,JOA评分术前平均为10.4分,术后为15.7分。n-HA/PA66复合生物活性融合器于术后3～6个月骨性融合。颈椎生理曲度、椎间高度、颈椎稳定性均维持良好。无融合器下沉、塌陷、移位发生,无感染、内固定物松动、脱落、断裂等并发症。n-HA/PA66复合生物活性融合器能有效重建和维持颈椎体的结构和高度,可能是一种理想的颈椎植骨替代材料。     

表达Tie2基因的单核细胞研究进展

肿瘤血管的生成和发展在肿瘤的生长和恶化过程中起着关键作用。一类表达Tie2基因的单核细胞（TEM）通过一些生长因子和化学信号被募集到肿瘤组织中,旁分泌细胞因子促进肿瘤血管的生成和发展。TEM在促进肿瘤血管形成中起着重要作用,与血管内皮细胞祖细胞（EPC）不同的是,TEM只是在肿瘤的血管生成中起促进作用,但在肿瘤周围临近的正常组织中没有发现其存在,TEM被认为是一类肿瘤组织特异性的细胞。以TEM为载体细胞,通过TEM表达抗肿瘤药物,靶向递送的抗肿瘤药物能够有效的抑制肿瘤的生长和恶化。     

大鼠siTLR4重组腺病毒载体的构建及功能鉴定

目的构建特异性针对大鼠TLR4基因的siRNA重组腺病毒载体,为进一步研究TLR4在不同疾病中的免疫调节机制奠定重要基础。方法设计并合成3对大鼠TLR4基因的siRNA序列,退火处理后定向克隆到pSES-HUS穿梭质粒中,获得pSES-HUS-siTLR4,经Pme I线性化后与pAdEasy-1骨架质粒在BJ5183细菌中进行同源重组,从而构建pAd-siTLR4质粒,通过脂质体转染,在HEK293细胞中包装形成Ad-siTLR4腺病毒颗粒,用该病毒感染PC12细胞,从基因和蛋白质水平分别检测3对siTLR4的抑制效果,同时从蛋白质水平检测TLR4下游关键分子NF-κB的表达。结果 PCR、酶切和测序均证实目的基因正确克隆到所构建的pAd-siTLR4重组腺病毒载体中;经包装获得的Ad-siTLR4病毒颗粒在PC12细胞中能够有效地抑制TLR4 mRNA和蛋白水平的表达,并显著地降低了NF-κB的表达。结论成功构建了pAd-siTLR4重组腺病毒质粒,同时包装获得了Ad-siTLR4重组腺病毒,转染PC12细胞后不仅能明显降低TLR4的表达,而且有效地抑制了TLR4通路下游关键分子NF-κB的表达。     

The heat shock protein 90 inhibitor 17-AAG suppresses growth and induces apoptosis in human cholangiocarcinoma cells

The aim of this study was to investigate the effects of 17-Allylamino-17-demethoxygeldanamycin (17-AAG), a heat shock protein 90 (HSP90) inhibitor, on the proliferation, cell cycle, and apoptosis of human cholangiocarcinoma (CCA) cells. Cell proliferation and cell cycle distribution were measured by the MTT assay and flow cytometry analysis, respectively. Induction of apoptosis was determined by flow cytometry and Hoechst staining. The expressions of cleaved poly ADP-ribose polymerase (PARP), Bcl-2, Survivin, and Cyclin B1 were detected by Western blot analysis. The activity of caspase-3 was also examined. We found that 17-AAG inhibited cell growth and induced G2/M cell cycle arrest and apoptosis in CCA cells together with the down-regulation of Bcl-2, Survivin and Cyclin B1, and the up-regulation of cleaved PARP. Moreover, increased caspase-3 activity was also observed in CCA cells treated with 17-AAG. In conclusion, our data suggest that the inhibition of HSP90 function by 17-AAG may provide a promising therapeutic strategy for the treatment of human CCA.     

抗NPM1单克隆抗体的制备

目的 制备并鉴定NPM1单克隆抗体.方法 利用纯化的NPM1融合蛋白作为抗原,通过常规的细胞融合技术制备杂交瘤细胞,用间接ELISA法筛选能出产生抗NPM1单克隆抗体的阳性细胞株,对抗NPM1单克隆抗体的特性进行分析.结果 筛选出1株产生抗NPM1单克隆抗体的杂交瘤细胞株,产生的抗体为IgGl亚类,效价达1∶720000;纯化后经SDS-PAGE显示两条蛋白条带,纯度达95％以上,相对分子质量约为50000和25000,与单一抗体重链、轻链分子大小相符.免疫组化证实,纯化的2G7抗NPM1单克隆抗体可检测出NPM1在结直肠癌表达,阳性位点为细胞核.结论 制备的抗NPM1单克隆抗体可用于NPM1蛋白功能的研究与临床检测.     

高迁移率族蛋白-1对增生性瘢痕成纤维细胞的调控作用

目的 探讨高迁移率族蛋白-1（HMGB1）对增生性瘢痕成纤维细胞（HSFbs）的调控作用.方法 增生性瘢痕组织取自中山大学附属第一医院烧伤科行瘢痕整复术的患者,组织块法培养HSFbs.通过细胞增殖、实时荧光定量PCR（qRT-PCR）、迁移和胶原网收缩实验检测不同浓度（0～200 ng/mL） HMGB1对HSFbs的影响.结果 1.56、3.13、6.25、12.50、25.00 ng/mL HMGB1呈剂量依赖方式刺激HSFbs的增殖,HMGB1对HSFbs Toll样受体4（TLR4）、α-滑肌肌动蛋白（α-SMA）、非肌肉肌球蛋白Ⅱ（NMMⅡ）mRNA的表达有促进作用而对基质金属蛋白酶1-α （MMP1-α）无,HMGB1对HSFbs迁移及收缩有促进作用但可被TLR4阻断剂抑制.结论 HMGB1可能通过TLR4调控HSFbs而在增生性瘢痕的形成过程中起作用.     

综合心理治疗对骨折术后患者睡眠质量的影响

目的探讨综合心理治疗对骨折术后患者睡眠质量及心理状态的影响。方法选择2012年1月-2013年12月在我市骨科医院住院的骨折术后患者76例,随机分为对照组32例和治疗组44例,对照组采用常规骨科治疗与护理;治疗组在常规治疗的基础上给予综合性心理治疗。对两组患者治疗前后进行匹兹堡睡眠质量指数(PSQI)及焦虑自评(SAS)和抑郁自评(SDS)[1]的评分比较分析。结果 1心理治疗前两组患者PSQI总分和各成分得分差异无显著性(t=0.108~0.343,P0.05),两组间SAS,SDS评分差异无显著性(t=0.378,0.592;P0.05);2综合性心理治疗后治疗组患者的PSQI总分,睡眠质量、入睡时间,睡眠时间、睡眠效率、睡眠障碍得分显著低于对照组(t=3.46~6.00,P0.01);日常功能障碍(t=2.201,P0.05)治疗组的SAS,SDS评分明显低于对照组(t=15.16,10.580;P0.01)。结论综合性心理治疗可以有效地改善骨折术后患者的睡眠质量及缓解其负性情绪。     

Restirring and Reheating Effects on Microstructural Evolution of Al–Zn–Mg–Cu Alloy during Underwater Friction Stir Additive Manufacturing

Friction stir additive manufacturing (FSAM) can be potentially used for fabricating high-performance components owing to its advantages of solid-state processing. However, the inhomogeneous microstructures and mechanical properties of the build attributed to the complex process involving restirring and reheating deserve attention. This study is based on the previous research of the underwater FSAMed 7A04 aluminum alloy and adopts a quasi in situ experimental method, i.e., after each pass of the underwater FSAM, samples were taken from the build for microstructural observation to investigate the restirring and reheating effects on microstructural evolution during the underwater FSAM. Fine-grain microstructures were formed in the stir zone during the single-pass underwater FSAM. After restirring, the grain size at the bottom of the overlapping region decreased from 1.97 to 0.87 μm, the recrystallization degree reduced from 74.0% to 29.8%, and the initial random texture transformed into a strong shear texture composed of the C {110}<11¯0>. After reheating, static recrystallization occurred in the regions close to the new additive zones, increasing the grain size and recrystallization degree. This study not only revealed the microstructural evolution during the underwater FSAM but also provided a guideline for further optimization of the mechanical properties of the Al–Zn–Mg–Cu alloy build.     

Incidence and risk of hypertension with lenvatinib in treatment of solid tumors: An updated systematic review and meta‐analysis

This meta‐analysis was performed to assess the relationship between Lenvatinib use for malignancy and hypertension (HTN). A total of 2483 patients met inclusion criteria. The relative risk (RR) for all‐grade and high‐grade (≧3) HTN were 2.61 (p ≦ .001) and 3.35 (p≦ .001), respectively, for Lenvatinib compared with other multitarget tyrosine kinase inhibitors or placebo. The cumulative incidence of all‐grade and high‐grade HTN was 70% and 34%, respectively. The studies with median treatment duration (TD) longer than 7.4 months demonstrated a higher incidence of high‐grade HTN than studies with shorter TD (34% vs 28%). The incidence of all levels of HTN increased with TD (68% vs 49%). Trials with median progression‐free survival (PFS) longer than nine months had a higher incidence of both all‐grade (37% vs 28%) and high‐grade (71% vs 48%) HTN. Lenvatinib, a drug commonly used in cancer treatment, is a risk factor for the development of HTN. A longer duration of Lenvatinib treatment was associated with higher frequency of HTN. Further investigation for Lenvatinib of the association between the occurrence of HTN and prognosis will be warranted.     

Predictors of post coronary artery bypass grafting atrial fibrillation

Objective: To investigate the incidence and relative risk factors of post coronary artery bypass grafting(post-CABG) atrial fibrillation (AF). Methods: 312 patients with CABG were reviewed and divided into an AF group and a non-AF group. Statistical analysis was used to compare the data between the two groups and screen for risk factors of post-CABG AF. Results: 103/312(33.01%) patients developed post-CABG AF. Univariate analysis showed that patients in AF group compared with those in non-AF group were more likely to have advanced age (≥ 70 years), early postoperative withdrawal of β-blockers, hypertension, left atrial enlargement ( ≥40 mm), a history of AF, prolonged p-wave duration ( ≥ 120 ms) and increased number of grafts (≥3). Multivariate logistic regression analysis showed that advanced age (≥70 years), early postoperative withdrawal of β-blockers, hypertension, left atrial enlargement (≥40 mm) and a history of AF were highly related to post-CABG AF. Conclusion: The incidence of AF in patients following CABG was 33.01% in this study. Advanced age, early postoperative withdrawal of β-blockers,hypertension, left atrial enlargement and a history of AF were independent risk factors of post-CABG AF.