Targeted MR Imaging Adopting T1-Weighted Ultra-Small Iron Oxide Nanoparticles for Early Hepatocellular Carcinoma: An in vitro and in vivo Study

ObjectiveThe purpose of this study was to produce an arginylglycylaspartic acid (RGD) peptide-modified ultra-small superparamagnetic iron oxide (Fe₃O₄) nanoparticles (NPs) for targeted magnetic resonance (MR) imaging of hepatocellular carcinoma (HCC) cells and verify its utility as a T1 positive MRI imaging contrast agent in vitro and in vivo.MethodsThe carboxylated Fe₃O₄ NPs stabilized with sodium citrate were conjugated with polyethylene glycol (PEG)-linked RGD nanoparticles to form a novel target contrast agent Fe₃O₄-PEG-RGD NPs. The specificity of Fe₃O₄-PEG-RGD to bind RGD receptor was investigated in vitro by HepG2 cellular uptake and cell MR imaging, and in vivo by MR imaging of subcutaneous HepG2 tumors of nude mice.ResultsThe formed Fe₃O₄-PEG-RGD NPs displayed good biocompatibility, and the ultrahigh r1 relaxivity was 1.37 mM⁻¹S⁻¹. The synthesized Fe₃O₄-PEG-RGD NPs were demonstrated spherical-like with an approximate diameter of 2.7 nm in similar size. The targeting effect to HepG2 cells was confirmed by in vitro cellular uptake and cell MR imaging. The in vivo MR imaging of nude mice demonstrated that the MR signal intensity enhancement of HepG2 tumor in Fe₃O₄-PEG-RGD NPs treated mice was significantly higher than in mice treated with non-targeted Fe₃O₄-mPEG NPs at the same post-administration time point.ConclusionThe results indicate that the Fe₃O₄-PEG-RGD particles have potential utility as T1 positive contrast agent in targeted MR imaging.     

超顺磁Fe3O4@PDA核-壳结构纳米粒子的制备及表征

利用多元醇高温热解法和溶液氧化法制备超顺磁四氧化三铁聚多巴胺核-壳结构纳米粒子(Fe₃O₄@PDA)。采用 X 射线衍射(XRD)、透射电子显微镜(TEM)、动态光散射(DLS)、傅里叶转换红外光谱(FT-IR)和热重分析(TG)等对 Fe₃O₄@PDA 的结构、形貌和组成进行表征。采用综合物性测试系统(PPMS)对样品的磁性能进行表征。结果表明:Fe₃O₄@PDA 的尺寸可以通过氨水与多巴胺的物质的量之比和反应时间进行调控;当Fe₃O₄@PDA 中Fe₃O₄的质量分数约为5%时,具有超顺磁性,磁饱和强度为3.8 emu/g,比理论值高出36%。     

Salvia fruticosa reduces intrinsic cellular and H2O2-induced DNA oxidation in HEK 293 cells; assessment using flow cytometry

ObjectiveTo investigate the role of water-soluble extract of Salvia fruticosa (Greek sage) (S. fruticosa) leaves in reducing both intrinsic cellular and H₂O₂-induced DNA oxidation in cultured human embryonic kidney 293 cells. S. fruticosa, native to the Eastern-Mediterranean basin, is widely used as a medicinal herb for treatment of various diseases.MethodsDried leaves of S. fruticosa were extracted in phosphate buffer saline and purified using both vacuum and high pressure filtrations. Each mL of the preparation contained (7.1×1.0) mg of extract. HEK-293 cells were incubated in one set with S. fruticosa extract in the presence of 0.1 mmol/L H₂O₂, and in the other set with the addition of the extract alone. The DNA oxidation was measured using fluorescence upon fluorescein isothiocyanate derivatization of 8-oxoguanine moieties. The fluorescence was measured using flow cytometry technique.ResultsCells incubated 3 h with 150 μL extract and exposed to 0.1 mmol/L H₂O₂ showed lower intensity of fluorescence, and thus lower DNA oxidation. Moreover, cells incubated 3 h with 100 μL of the extract showed lower intensity of fluorescence, and thus lower intrinsic cellular DNA oxidation compared to control (without S. fruticosa).ConclusionsThe results from this study suggest that the water-soluble extract of S. fruticosa leaves protects against both H₂O₂-induced and intrinsic cellular DNA oxidation in human embryonic kidney 293 cells.     

参麦注射液抗氧化活性体外实验研究

[目的] 系统研究参麦注射液体外抗氧化性能。[方法] 采用铁还原抗氧化能力 （FRAP）法、1,1-二苯基-2-三硝基苯肼（DPPH）自由基清除法、一氧化氮（NO）自由基清除法、过氧化氢（H₂O₂）清除法、亚铁（Fe²⁺）离子螯合法分别测试不同稀释倍率参麦注射液的总抗氧化能力、DPPH·清除活性、NO·清除活性、H₂O₂清除活性和Fe²⁺离子螯合活性,并将结果与0.1mg/mL 2,6-二叔丁基对甲酚（BHT）、10 mmol/L水溶性维生素E（Trolox）和10%柠檬酸的结果进行比较。[结果] 参麦注射液具有一定的体外抗氧化能力,总抗氧化能力和对自由基清除活性均呈浓度正依赖性;10倍稀释参麦注射液总抗氧化能力显著低于BHT和Trolox （P<0.01）,但高于柠檬酸（P<0.01）;参麦注射液对不同自由基清除能力存在差异,其强弱顺序为：NO·[（54.4±6.6）%] > Fe²⁺离子螯[（42.6±3.2）%] > DPPH·[（36.2±2.8）%] > H₂O₂[（23.5±1.2）%]。[结论] 参麦注射液体外抗氧化活性研究将为其抗氧化药理学机制提供了实验依据。     

自建两轮PCR法对低载量HBV DNA S区基因的扩增及实验条件优化

目的 探究低载量HBV DNA S区基因扩增的可行性并对实验条件进行优化,为隐匿性HBV感染(OBI)患者HBV DNA S区基因突变检测提供依据.方法 采用传统巢式PCR和自建两轮PCR方法扩增6例低HBV DNA载量(100～200 IU/mL)和22例更低HBV DNA载量(20～99 IU/mL)的血清样本中HBV DNA S区基因,并对引物序列、引物量、PCR产物模板稀释倍数、退火温度、PCR反应循环数、PCR总反应体系等条件进行优化.PCR扩增产物经琼脂糖凝胶电泳后,切割目的条带凝胶进行克隆测序,然后对克隆测序结果进行核酸序列BLAST比对确认.结果 设计3对巢式PCR引物(P1～P3),扩增产物理论上包含整个HBV DNA S区基因.经过PCR扩增条件优化后,6例低HBV DNA载量的血清样本中仅2例经巢式PCR扩增出HBV DNA S区基因特异性靶序列,22例更低HBV DNA载量样本无一例扩增成功.自建两轮PCR法设计了P4～P15共12对引物,扩增产物理论上包含整个HBV DNA S区基因.经过PCR扩增条件优化并筛选出P13为最佳引物后,6例低HBV DNA载量的血清样本全部扩增出HBV DNA S区基因特异性靶序列;15例(15/22,68.18％)更低HBV DNA载量的样本扩增出HBV DNA S区基因特异性靶序列,经PCR产物克隆测序均证实为HBV DNA S区基因,该15例样本中HBV DNA载量最低为20.1 IU/mL.结论 基于引物P13自建的两轮PCR法更适用于低载量HBV DNA S区基因的扩增,扩增效率和特异性均优于传统巢式PCR;扩增产物可进一步应用于OBI者HBV DNA S区基因序列突变分析.     

NANOG Alleviates the Damage of Human Hair Follicle Mesenchymal Stem Cells Caused by H_2O_2 through Activation of AKT Pathway

Objective To explore the protective effect of NANOG against hydrogen peroxide(H_2O_2)-induced cell damage in the human hair follicle mesenchymal stem cells(hHF-MSCs). Methods NANOG was expressed from a lentiviral vector, pLVX-IRES-ZsGreen. NANOG hHF-MSCs and vector hHF-MSCs were treated with 400 μmol/L hydrogen peroxide(H_2O_2) for 2 h, the cell survival rate, cell morphology, ROS production, apoptosis and expression of AKT, ERK, and p21 were determined and compared. Results Our results showed that NANOG could activate AKT and upregulate the expression of p-AKT, but not p-ERK. When treated with 400 μmol/L H_2O_2, NANOG hHF-MSCs showed higher cell survival rate, lower ROS production and apoptosis, higher expression of p-AKT, higher ratio of p-AKT/AKT. Conclusion Our results suggest that NANOG could protect hHF-MSCs against cell damage caused by H_2O_2 through activating AKT signaling pathway.     

脂氧素A4对急性肺损伤肺泡上皮通透性及claudin-4蛋白的影响

目的 探讨脂氧素A₄（lipoxin A₄,LXA₄）对内毒素性急性肺损伤（acute lung injury,ALI）肺泡上皮通透性及claudin-4蛋白的影响。方法 通过尾静脉注射脂多糖（lipopolysaccharide,LPS）制作大鼠内毒素性急性肺损伤模型,并予以脂氧素A₄治疗。测定各组大鼠肺泡上皮的通透性,观察肺组织形态学变化,检测肺组织湿干重比（wet to dry weight ratio,W/D）,以及测定claudin-4蛋白含量。结果 与内毒素损伤组相比,脂氧素A₄组可显著降低肺泡上皮通透性,改善肺组织形态,降低W/D,上调claudin-4蛋白表示水平。结论 脂氧素A₄可降低急性肺损伤大鼠肺泡上皮通透性,减轻肺水肿,其机制可能与其上调claudin-4蛋白表达水平有关。     

Panhandle PCR strategy to amplify the upstream unknown sequence of the Prl gene ofpythium guiyangense

Objective： Based on a partialsubtilisin-like protease, Prl genomic sequence ofPythium guiyangense which has been cloned before, Panhandle PCR strategy was used to amplify the upstream flanking sequence adjacent to the known sequence of the Prl gene. Methods： The genomic DNA was firstly digested with BamH I and then treated with calf intestinal alkaline phosphatase（CIAP）. Next, a 5＇ phosphorylated oligonucleotide was ligated to the 5＇ ends of BamH I -digested DNA. After denaturation, intmstrand annealing and polymemse extension, a pan with a handle was formed,and lastly the nested PCR was performed. Results： A 864 bp product was amplified,which was adjacent to the known sequence of Prl gene.The gene has been accessed by GenBank （Accession：JQ975036）. Conclusion： Panhandle PCR is a quick and convenient approach for amplifying and identifying unknown partner genes,which facilitates cloning full-length Prl gene     

磁珠法半自动提取全血基因组DNA条件的优化

目的:探讨磁珠法提取基因组DNA的影响因素,建立快速、高效、批量提取全血基因组DNA的优化方案。方法:使用磁珠法核酸自动提取系统从全血中提取基因组DNA,紫外分光光度计测定DNA浓度和纯度。采用正交试验设计分析裂解时间、全血量、磁珠量和乙醇浓度4个因素的主效应和全血量与裂解时间、磁珠量,裂解时间与磁珠量的二阶交互作用对所提取DNA浓度和纯度的影响。结果:裂解时间、全血量、磁珠量和乙醇浓度4个主效应对DNA浓度的影响均存在统计学差异(P<0.05),当裂解时间为15 min,全血量为100μl,磁珠量为80μl,乙醇浓度为80%时,DNA平均浓度最高。磁珠量、裂解时间和全血量的交互作用对DNA OD260/OD280的比值有影响(P=0.008和P=0.013)。当磁珠量为40μl,裂解时间为15 min,全血量为100μl时,OD260/OD280的比值较好。磁珠量和乙醇浓度影响DNA OD260/OD230的比值(P=0.017和P<0.05),磁珠量为40μl,乙醇浓度为80%时,OD260/OD230的比值更好。结论:当DNA得率优先考虑时,可以选择裂解时间15 min、全血量100μl、磁珠量80μl、乙醇浓度80%的提取条件;而对DNA纯度要求较高时,可以将磁珠量改为40μl,以获得最优DNA提取效果。     

pH响应性磁靶向纳米复合粒Fe3O4@SiO2@PEG-b-PAsp@DOX的构建及体外评价

目的 制备pH响应性的磁性纳米复合粒多柔比星(doxorubicin,DOX)载体Fe3O4@SiO2@PEG-b-PAsp@IDOX并对其理化性质进行表征,考察药物的pH响应性释放、在磁场作用下的靶向性及其对人肺癌A549细胞的杀伤作用.方法 利用水热法、St(o)ber方法、溶胶凝胶法、交联法等构建pH响应性载药磁性纳米复合粒Fe3O4@SiO2@PEG-b-PAsp@IDOX;利用透射电镜观察其形貌,激光粒度-zeta电位测定仪测定其粒径和zeta电位,磁滞回线测试仪测定其磁性;紫外分光光度法测定载药磁性纳米复合粒的载药量与包封率,透析法测定其pH响应性释药,CCK-8法和Annexin Ⅴ-FITC/PI双染法考察其体外对人肺癌A549细胞的杀伤作用.结果 Fe3O4@SiO2@PEG-b-PAsp@DOX载药体系的平均粒径为(197.7±1.5)nrn,zeta电位为(-35.9±0.6)mY,载药量(20.36±0.67)％,包封率(83.71±0.53)％.在较低的pH(5.5)下DOX的累积释放量得到提高(P＜0.05),在外磁场作用下表现出良好的磁响应性和细胞靶向性,且对人肺癌A549细胞具有显著的杀伤作用.结论 Fe3O4@SiO2@PEG-b-PAsp@DOX具有良好的pH响应性和磁靶向特性,可使药物靶向到达肿瘤部位并控制释放,有效杀伤人肺癌A549细胞.     

全血基因组DNA的提取和纯化方法比较

目的探讨全血基因组DNA的快速纯化方法。方法分别采用表面活性剂裂解法、传统酚抽提法、加热法分别制备DNA，分析各种方法提取DNA的产量、纯度，以及方法本身的优缺点、费用等，同时我们进行RAPD标记实验以比较纯化的DNA在PCR上应用的效果。结果表面活性剂裂解法简单快速，其制备的DNA产率、纯度明显高于传统酚抽提法，但其完整性不如后者。加热法快速制备的全血基因组DNA作为模板虽然纯度差，但仍可用于PCR，并得到满意的检测结果。同一份标本采用不同方法提取的DNA作为模板进行的RAPD标记实验，其多重PCR产物进行分离产生的DNA图谱基本一致。结论3种全血DNA纯化方法均可满足不同的实验要求。     

Caveolin-1基因敲除小鼠子代基因型的鉴定及繁育方法

目的 探讨小凹蛋白-1(caveolin-1)基因敲除小鼠的鉴定方法与最优繁育方式,为深入研究caveolin-1在脑缺血损伤修复中的作用提供理想的动物模型。方法 将引进的caveolin-1基因敲除小鼠饲养于SPF级实验室,煮沸裂解法提取鼠尾组织基因组DNA,根据美国杰克逊实验室(Jackson Laboratory)提供的引物序列进行PCR反应检测其基因型,采用caveolin-1^+/-杂合子互交、杂合子与caveolin-1^-/-纯合子杂交(正交及反交)、纯合子互交4种不同的交配方式,观察亲代小鼠的受孕率、子代小鼠的外形特征及纯合率。结果 琼脂糖凝胶电泳显示PCR产物分子量大小约200 bp和661 bp,与预期的目的基因片段分子量大小一致,成功鉴定了caveolin-1基因敲除小鼠的不同基因型;不同交配方式的繁殖结果基本符合孟德尔遗传规律,且雌性、雄性caveolin-1^-/-纯合鼠具有一定的繁殖能力,三种不同基因型小鼠的外形特征无明显差异。结论 煮沸裂解法提取基因组DNA、PCR法能够快速可靠鉴定caveolin-1基因敲除小鼠的基因型;caveolin-1杂合子小鼠互交与纯合子互交相结合的繁育方法可能是短期内获得足量纯合子子鼠与同源野生子鼠的较好方式。     

P(St-co-MMA)微球表面包覆磁性氧化石墨烯的制备与表征

以单分散的苯乙烯-甲基丙烯酸甲酯共聚物(P(St-co-MMA))微球为载体,FeSO₄·7H₂O和FeCl₃·6H₂O为铁源,NaOH为沉淀剂,在氧化石墨烯(GO)存在下,利用反相共沉淀法通过原位复合技术在P(St-co-MMA)微球表面包覆磁性氧化石墨烯(P(St-co-MMA)/Fe₃O₄/GO)。通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶变换红外光谱仪(FT-IR)、X射线衍射仪(XRD)、振动样品磁强计(VSM)和氮吸附-脱附等温线对P(St-co-MMA)/Fe₃O₄/GO样品的结构和性能进行表征分析。研究结果表明:纳米级的磁性氧化石墨烯成功地负载在了微米级的共聚物P(St-co-MMA)表面,所制备的P(St-co-MMA)/Fe₃O₄/GO微纳米复合物平均孔径为14.55 nm,孔体积为0.204 2 cm³/g,比表面积为56.14 m²/g。该复合物具有超顺磁性和良好的磁响应性,能够满足磁分离的要求。     

矿物药玄明粉与无水硫酸钠的构效对比研究

目的 对比研究矿物药玄明粉与无水硫酸钠结构与药效差异,探索二者的作用机制。方法 采用AXIOS型X射线荧光光谱法对二者结构进行比较;采用小鼠胃排空、肠推进模型和复方地芬诺酯所致便秘模型对二者药效进行比较。结果 玄明粉有正交和立方两种晶型,无水硫酸钠只有正交晶型;除共有化学组成外,玄明粉还含有Al₂O₃、K₂O、SrO、ZnO、Cl^?,无水硫酸钠仅有Fe₂O₃;药效对比实验中,发现二者对小肠运动的影响具有显著性差异（P＜0.01）。结论 玄明粉与无水硫酸钠在结构和药效上存在一定的差异,实验结果可为临床应用提供参考依据。     

microRNA-140真核表达载体的构建及鉴定

目的 构建miR-140真核表达载体并检测其在兔软骨细胞中的表达情况。方法 以人全血标本基因组为模板,PCR扩增出带有酶切位点的miR-140序列,将该序列定向克隆入pBudCE4.1载体中,构建pBudCE4.1-miR-140真核表达载体。将核定位信号肽偶联核激酶底物短肽（nucleus localization signal linked nucleic kinase substrate short peptide,NNS）修饰的壳聚糖（^NNSCS）分别与pBudCE4.1-miR-140重组质粒及pBudCE4.1空质粒形成纳米复合物,分别瞬时转染体外分离培养的正常兔原代关节软骨细胞,实时荧光定量PCR方法检测miR-140的表达情况。结果 构建的pBudCE4.1-miR-140真核表达质粒酶切鉴定和测序结果均正确,表明miR-140成功克隆入pBudCE4.1载体中。实时荧光定量PCR结果表明,与^NNSCS/pBudCE4.1对照组相比,^NNSCS/pBudCE4.1-miR-140转染组软骨细胞中miR-140表达升高约14.5倍（P<0.05）。结论 成功构建了pBudCE4.1-miR-140真核表达载体,瞬时转染后软骨细胞可以有效地高表达miR-140,为将来探究miR-140在软骨损伤修复中的作用机制奠定了基础。     

Preparation of Fe3O4@SW-MIL-101-NH2 for selective pre-concentration of chlorogenic acid metabolites in rat plasma,urine, and feces samples

An innovative sandwich-structural Fe-based metal-organic framework magnetic material (Fe₃O₄@SW-MIL-101-NH₂) was fabricated using a facile solvothermal method. The characteristic properties of the material were investigated by field emission scanning electron microscopy, transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, X-ray powder diffraction, vibrating sample magnetometry, and Brunauer-Emmett-Teller measurements. Fe₃O₄@SW-MIL-101-NH₂ is associated with advantages, such as robust magnetic properties, high specific surface area, and satisfactory storage stability, as well as good selective recognition ability for chlorogenic acid (CA) and its metabolites via chelation, hydrogen bonding, and π-interaction. The results of the static adsorption experiment indicated that Fe₃O₄@SW-MIL-101-NH₂ possessed a high adsorption capacity toward CA and its isomers, cryptochlorogenic acid (CCA) and neochlorogenic acid (NCA), and the adsorption behaviors were fitted using the Langmuir adsorption isotherm model. Then, a strategy using magnetic solid-phase extraction (MSPE) and ultra-performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry (UPLC-Q-TOF MS/MS) was developed and successfully employed for the selective pre-concentration and rapid identification of CA metabolites in rat plasma, urine, and feces samples. This work presents a prospective strategy for the synthesis of magnetic adsorbents and the high-efficiency pretreatment of CA metabolites.     

In vitro studies to assess the antioxidative,radical scavenging and arginase inhibitory potentials of extracts from Artocarpus altilis,Ficus exasperate and Kigelia africana

ObjectiveTo justify the use of Artocarpus altilis (A. altilis), Ficus exasperata (F. exasperata) and Kigelia africana (K. africana) in ethnomedicine for the treatment of several ailments and to evaluate the in vitro antioxidant, radical scavenging and arginase inhibitory potentials of these herbs and compared with catechin (Standard).MethodsAntioxidant activities were determined by 2,2-diphenyl-1-picrylhydrazyl (DPPH), nitric oxide, hydrogen peroxide (H₂O₂) and hydroxyl (OH) radicals scavenging methods. The flavonoids and phenolics content, inhibition of arginase activity, Fe²⁺/ascorbate-induced lipid peroxidation (LPO) and reducing power were also determined.ResultsThe A. altilis, F. exasperata and K. africana showed dose-dependent and significant scavenging of DPPH, H₂O₂ and OH radicals in vitro relative to catechin. The A. altilis and F. exasperata effectively scavenged DPPH radical with IC₅₀ of 593 and 635 μg/mL and, OH radical with IC₅₀ of 487 and 514 μg/mL, respectively. The DPPH and OH radicals scavenging activities followed the order A. altilis>F. exasperata>K. africana. In addition, A. altilis and F. exasperata significantly (P<0.05) inhibited LPO in a dose-dependent manner. The A. altilis extract had the most potent inhibitory activity against LPO with 79% relative to catechin (28%) at 750 μg/mL. The reducing power followed the order: A. altilis>Catechin>F. exasperata>K. africana at 1 000 μg/mL. The A. altilis at 500 and 750 μg/mL significantly (P<0.05) inhibited arginase activity by 63% and 67%, respectively. The flavonoids contents were found to be highest in A. altilis.ConclusionsExtracts of A. altilis and F. exasperata are potent antioxidative agents with strong radical scavenging activity and inhibition of lipid peroxidation.     

壬基酚对大鼠5-羟色胺及其2A受体的影响

目的 观察壬基酚(NP)对大鼠血浆和尿液中5-羟色胺(5-hydroxy tryptamine,5-HT)及血小板中5-HT和5-HT2A受体含量的影响,探讨壬基酚对大鼠5-HT和5-HT2A受体影响的毒效应机制。方法 将24只SD雄性大鼠分为阴性对照组和NP低、中、高剂量组[30、90、270mg/(kg·d)],隔日灌胃染毒28d后检测大鼠血浆中5-HT、血小板中5-HT和5-HT2A受体含量,并检测灌胃后收集到的24h尿液中5-HT的含量。结果 染毒28d后,随NP暴露的剂量增加,各组大鼠血浆、血小板及尿液中5-HT含量升高,血小板中5-HT2A受体表达则下降。NP暴露中、高剂量组大鼠血浆及血小板中5-HT含量均高于对照组(P<0.01;P<0.01),NP暴露高剂量组大鼠血小板5-HT2A受体表达低于对照组(P<0.01)。第4~28天,NP暴露低、中、高剂量组大鼠的尿液5-HT含量均高于对照组(P<0.01)。结论 NP暴露剂量与大鼠血小板5-HT、5-HT2A受体及血浆和尿液中5-HT含量均呈剂量-效应关系,提示NP通过影响大鼠5-HT水平和5-HT2A受体表达而产生毒效应。     

单细胞凝胶电泳分析地黄提取物对仓鼠肺成纤维细胞DNA的损伤作用

目的 采用单细胞凝胶电泳（彗星实验）技术研究地黄提取物致仓鼠肺成纤维细胞（CHL细胞）DNA的损伤作用,为该药物临床前安全性评价提供参考。方法 采用0.2、1.0、5.0 mg/mL地黄提取物,用双氧水作为阳性对照药,处理细胞,24 h后收获细胞,进行彗星电泳实验。结果/b> 双氧水处理后造成CHL细胞产生明显的DNA损伤,呈现不同彗尾长度的彗星,与阴性对照组比较有显著差异。不同质量浓度的地黄提取物处理细胞后,彗星长、彗尾长度等各项指标与阴性对照组比较无显著差异。结论 单细胞凝胶电泳检测DNA损伤的敏感度较高,不同质量浓度的地黄提取物对CHL细胞未产生DNA损伤。     

安徽省无偿献血人群HBV和HCV流行特征分析

目的 分析安徽省无偿献血人群HBV、HCV相关感染指标检出情况及其特征,为预防控制经输血传播疾病提供参考和依据。方法 收集安徽省血液管理信息系统内2016年1月至2020年12月无偿献血者的筛查资料,采用单因素和Pearson相关性分析对不同年份、不同献血次数、不同地区及不同年龄段献血者HBsA、HBV DNA、抗HCV、HCV RNA指标进行回顾性分析,了解HBV、HCV在不同特征人群中的流行情况。结果 共筛查无偿献血人群血液标本2 530 232例,HBsA、HBV DNA、抗HCV、HCV RNA阳性率分别为0.42%、0.10%、0.16%和1.03/10万,不同年度间HBsA、HBV DNA、抗HCV阳性率比较,差异有统计学意义(P<0.05),其中HBsA阳性率、抗HCV阳性率与年份相关,呈现逐年下降的趋势(r_{HBsA阳性率}=-0.900,P=0.037;r_{抗HCV阳性率}=-0.900,P=0.037)。皖南、皖中及皖北地区HBsA、HBV DNA、抗HCV阳性率比较,差异有统计学(P<0.05),皖南地区HBsA阳性率最高(0.65%),皖中地区HBV DNA阳性率最高(0.15%),皖北地区抗HCV阳性率最高(0.18%)。重复献血者占47.53%,重复献血者的HBV和HCV相关指标均低于初次献血者,差异有统计学意义(P<0.05)。18～55岁人群中,HBsA阳性率、HBV DNA阳性率随着年龄增加呈现线性上升趋势(r_{HBsA阳性率}=0.991,P=0.009;r_{HBV DNA阳性率}=0.974,P=0.005)。结论 安徽省无偿献血人群中HBV和HCV总体上呈低流行态势,献血者HBsA、抗-HCV阳性率逐年下降,HBsA、HBV DNA和抗HCV阳性献血者分别相对集中于皖南、皖中、皖北地区,初次献血、中高年龄段献血者阳性率较高,应持续开展献血人群相关指标的监测分析。