促红细胞生成素预处理增强大鼠骨髓间充质干细胞定向归巢能力的初步研究

目的探讨促红细胞生成素(EPO)对大鼠骨髓间充质干细胞(BMSC)增殖及迁移能力的影响。方法将第5代BMSC分为5组,分别为对照组(不加EPO)及10、100、500、1000 IU/mL EPO组,培养24 h和48 h后检测各组BMSC的增殖率、迁移能力以及趋化因子受体(CXCR)4的表达情况。将第5代BMSC分为BMSC组和EPO-BMSC组,培养48 h后观察EPO对两组BMSC的表面标志物、定向分化和细胞骨架形态的影响。结果EPO与BMSC共培养48 h后,与对照组比较,100、500 IU/mL EPO组BMSC增殖率和迁移能力增强,CXCR4蛋白表达量增高(均为P<0.05)。EPO-BMSC组BMSC表面标志物的表达和定向分化能力未受EPO影响。在EPO-BMSC组中,大多数细胞的纤维骨架沿细胞的长轴排列,呈平行状。结论EPO可提高BMSC的增殖率、迁移能力和组织修复治疗能力,可能通过增加CXCR4的表达,促进其向损伤器官组织的定向归巢。     

冬凌草甲素抑制人卵巢癌细胞恶性行为及机制研究

目的 研究冬凌草甲素（Oridonin）对人卵巢癌（Human ovarian cancer）SKOV3 细胞迁移和侵袭能力的影响及其潜在的分子机制。方法 采用CCK-8 法检测不同浓度（0、5、10、20、40、80μmol/L）的冬凌草甲素作用SKOV3细胞24、48 和72h 后细胞活力的变化,计算半数抑制浓度（IC50）。采用Annexin V-FITC/PI 双染法检测SKOV3细胞凋亡。采用划痕修复实验检测SKOV3细胞的迁移能力,Transwell小室实验检测SKOV3的侵袭能力。Western blot检测SKOV3细胞上皮细胞间充质转化（EMT）蛋白［E-钙黏蛋白（E-cadherin）、波形蛋白（Vimentin）］和Wnt/β-连环蛋白（β-catenin）信号通路中β-catenin及下游靶分子原癌基因（C-myc）、细胞周期蛋白D1（Cyclin D1）蛋白的表达。结果 冬凌草甲素可抑制SKOV3 细胞活力,且具有时间-剂量依赖性,作用24、48 和72 h后IC50值为23.57、12.48和7.29μmol/L。与对照组比较,5、10和20μmol/L冬凌草甲素作用SKOV3细胞24h 后,细胞凋亡率明显升高,迁移率和侵袭率降低（P<0.05）。与对照组比较,5、10和20μmol/L冬凌草甲素可升高E-cadherin 蛋白表达（P<0.05）,降低Vimentin 表达（P<0.05）。与对照组比较,5、10和20 μmol/L冬凌草甲素可降低β-catenin、C-myc和Cyclin D1表达（P<0.05）。结论 冬凌草甲素具有抑制SKOV3细胞增殖、转移和侵袭能力的作用,该作用与其抑制Wnt/β-catenin 信号通路有关。     

rhPDGF-BB对糖尿病大鼠骨髓基质干细胞迁移的促进作用

目的: 体外评价不同浓度人重组血小板衍生生长因子BB（recombinant human platelet derived growth factor-BB, rhPDGF-BB）对糖尿病大鼠骨髓基质干细胞（BMSCs）迁移的影响,以及基质细胞衍生因子（stromal cell-derived factor 1,SDF-1）和其G 蛋白偶联受体CXCR4调控作用的相关机制,为rhPDGF-BB应用于临床糖尿病患者相关骨修复再生治疗提供理论基础。方法: 建立链脲佐菌素诱导的糖尿病大鼠动物模型。体外培养糖尿病大鼠BMSCs,作为对照组。采用Transwell小室趋化模型,以浓度0、10、50、100 ng/mL rhPDGF-BB作用BMSCs,检测其体外趋化作用;定时定量RCR检测BMSCs SDF-1、CXCR4 mRNA的表达变化,筛选出药物最佳作用浓度;应用PI3K/Akt抑制剂,反向证实rhPDGF-BB对BMSCs的SDF-1、CXCR4表达的调节作用。采用SPSS 17.0软件包对数据进行统计学分析。结果: 链脲佐菌素诱导的糖尿病大鼠,1周后选取大鼠尾静脉血糖浓度高于16.7 mmol/L者为建模成功大鼠。与糖尿病大鼠的BMSCs相比,rhPDGF-BB促进糖尿病大鼠BMSCs的迁移,50 ng/mL rhPDGF-BB为促进糖尿病大鼠BMSCs迁移的最佳作用浓度,PI3K/Akt抑制剂明显抑制糖尿病大鼠BMSCs的迁移。结论: rhPDGF-BB促进糖尿病大鼠BMSCs的迁移,并通过SDF-1/CXCR4轴,调节糖尿病大鼠BMSCs的迁移。     

低表达S100钙离子结合蛋白A6促进食管腺癌SK-GT-4细胞的增殖和迁移

目的 探讨S100钙离子结合蛋白A6（S100A6）对食管腺癌SK-GT-4细胞增殖和迁移的影响。 方法 慢病毒转染，构建稳定细胞系shNC和shS100A6，Real-time PCR检测S100A6 mRNA表达情况；倒置显微镜和MTT检测细胞的增殖能力，Transwell检测细胞的迁移能力及U0126（MER1/2的抑制剂）、LY294002（PI3K抑制剂）对细胞增殖、迁移的影响；Western blotting检测细胞中S100A6、p-ERK、p-Akt及其下游参与增殖、迁移的相关蛋白的表达情况，检测U0126、LY294002对p-ERK、p-Akt及其下游参与增殖、迁移的相关蛋白表达的影响。 结果 构建了敲低S100A6的稳定细胞系，敲低S100A6促进了细胞的增殖和迁移，p-ERK、p-Akt水平升高，细胞周期抑制蛋白p21表达量下降、细胞周期蛋白D1(cyclinD1）表达升高，间质细胞标志蛋白——波形蛋白（vimentin）、β-连环蛋白（β-catenin）表达升高；U0126处理shS100A6细胞后，对细胞的增殖无影响，抑制细胞的迁移，p-ERK、β-catenin表达下降；LY294002处理shS100A6细胞后，抑制细胞的增殖和迁移，p-Akt表达下降，p21表达量升高，cyclinD1表达量下降，β-catenin表达下降。 结论 低表达S100A6促进细胞的增殖和迁移，其可能机制是通过p-Akt调控细胞周期的进程促进细胞增殖，通过激活p-Akt/p-ERK调控β-catenin促进细胞的迁移。     

SERPINA5 inhibits tumor cell migration by modulating the fibronectin–integrin β1 signaling pathway in hepatocellular carcinoma

In our previous study, we identified 1241 loci with somatic copy number alterations in human hepatocellular carcinoma (HCC) using Affymetrix SNP 6.0 arrays, and a putative cancer gene SERPINA5 was uncovered in a novel chromosomal region with recurrent copy number loss at 14q31.1–32.13. The SERPINA5 was reported to be deregulated in renal, breast, prostate and ovarian cancers. However, the roles of SERPINA5 in cancer remain greatly elusive. In this study, we found that the DNA dosage and expression level of the SERPINA5 gene were significantly decreased in HCC by quantitative real-time PCR. Notably, the expression levels of SERPINA5 negatively correlated with malignant progression of HCC. The SERPINA5 gene was further observed to reduce in vitro and in vivo metastatic potential of HCC cells. Moreover, secreted SERPINA5 protein also could inhibit the metastatic ability of HCC cells. Finally, we discovered that one of the mechanisms explaining SERPINA5 inhibition of HCC metastasis is through direct interaction with fibronectin and disruption of the fibronectin–integrin signaling pathway. These findings highlight an important role of SERPINA5 in the regulation of migratory and metastatic potentials of HCC and suggest a potential application of SERPINA5 in cancer treatment.     

Patterns of abuse amongst Sri Lankan women returning home after working as domestic maids in the Middle East: An exploratory study of medico-legal referrals

ObjectiveMigrant worker abuse is well recognised, but poorly characterised within the scientific literature. This study aimed to explore patterns of abuse amongst Sri Lankan women returning home after working as domestic maids.MethodsSri Lanka has over 2 million of its citizens employed overseas as international labor migrants. A cross-sectional study was conducted on Sri Lankan female domestic maids returning from the Middle East region who were referred for medico-legal opinion.ResultsA total of 20 women were included in the study. Average length of their employment overseas was 14 months. Complaints of physical violence directed mainly through their employers were made by 60% of women. Upon physical examination, two-thirds had evidence of injuries, with a third being subjected to repetitive/systematic violence. Eighty percent suffered some form of psychological trauma. Personal identity papers and travel documents had been confiscated by the employer in 85% of cases, with two thirds indicating they were prevented and/or restricted from leaving their place of work/residence.ConclusionsOur study demonstrates that female domestic maid abuse manifests through multiple pathways. Violence against such workers span the full spectrum of physical, financial, verbal, emotional abuse and neglect, as defined by the World Health Organization. Findings from this exploratory study cannot be generalized to the large volume of migrant worker outflows. Further research is needed to determine incidence and define patterns in other migrant worker categories such as low-skilled male workers.     

注射用血栓通中三七元素迁移的规律

目的:分析注射用血栓通中三七从原料到成品全过程的元素迁移规律,以便更好地控制成品中元素杂质。方法:采用ICP-MS法全面分析三七药材、三七总皂苷(中间体)和注射用血栓通中21种元素的含量。结果:21种元素的标准曲线相关系数r均在0. 999以上,回收率在92. 71%～107. 07%之间,RSD均在5%以内。三七药材中铝、铁含量较高,铅、砷、汞、镉、铜符合中华人民共和国药典的相关规定,三七总皂苷(中间体)和注射用血栓通中多数元素均未检出或含量极低。结论:注射用血栓通的提取工艺可有效去除三七中大部分元素,重金属及有害元素也降到较低水平。     

Cytotoxicity and mutagenicity studies on migration extracts from nanocomposites with potential use in food packaging

Clays are used in the food packaging industry to obtain nanocomposites. The use of these new materials is a concern, because they could reach consumers by oral exposure through possible migration, and potential toxic effects could be derived. In the present study, several in vitro basal cytotoxicity and mutagenicity tests on migration extracts obtained from a nanocomposite material with poly (lactic) acid (PLA) and two modified clays, Clay1 and Clay2, are shown. Migration extracts in distilled water showed values of 0.1 ± 0.2 mg/dm² in all samples. Also, the content of characteristic metals of the clays structure (Al, Ca, Mg, Fe, Si) was studied and no statistical differences were observed. For the cytotoxicity assays, the human intestinal Caco-2 and human liver HepG2 cells were selected. Cells were exposed to concentrations between 2.5% and 100% extracts determining three different biomarkers of cellular viability. No significant differences were observed in the cytotoxicity assays. Finally, mutagenicity was evaluated by the Ames test and resulted in the absence of mutagenic response at all the concentrations assayed. Taking in account all above mentioned, these new materials show a good profile for their use in food packaging although further research is still needed.