藏红花素诱导卵巢癌HO-8910细胞凋亡的体外实验

目的 探讨藏红花素(crocin)诱导卵巢癌HO-8910细胞凋亡及其作用机制.方法 MTT法分析藏红花素对卵巢癌HO-8910细胞增殖的影响;流式细胞仪检测藏红花素作用于卵巢癌HO-8910细胞后,细胞周期分布及凋亡率的改变;Western印迹法检测p53、Fas/APO-1和Caspase-3蛋白的表达.结果 MTT实验分析显示,藏红花素明显抑制卵巢癌HO-8910细胞生长;流式细胞仪检测结果显示,藏红花素作用于卵巢癌HO-8910细胞后,G0/G1期细胞数比例及细胞凋亡率升高.Western印迹法检测结果显示,p53和Fas/APO-1蛋白表达水平明显增加,Caspase-3活性增强.结论 藏红花素能明显抑制卵巢癌HO-8910细胞的生长,使其被阻滞于G0/G1期,并可能通过上调p53、Fas/APO-1蛋白表达水平,进而激活Caspase-3调控的凋亡途径,从而促进卵巢癌HO-8910细胞凋亡.     

藏红花素调节Hippo信号通路对病理性瘢痕成纤维细胞增殖和凋亡的影响

目的:初步探讨藏红花素(Crocin)调节Hippo信号通路对病理性瘢痕成纤维细胞增殖和凋亡的影响。方法:体外分离培养人瘢痕疙瘩成纤维细胞(HKF),免疫荧光鉴定成纤维细胞;MTT法计算细胞增殖抑制率,筛选Crocin最佳干预浓度,将HKF细胞分为control组和Crocin低、中、高剂量组(Crocin浓度分别为20、50、100μmol/L);细胞转染实验中将HKF细胞分为control组、Crocin组(100μmol/L)、pcDNA3.1组(转染pcDNA3.1)、pcDNA3.1+Crocin组(转染pcDNA3.1+100μmol/L Crocin干预)、pcDNA3.1-YAP/TAZ组(转染pcDNA3.1-YAP/TAZ)、pcDNA3.1-YAP/TAZ+Crocin组(转染pcDNA3.1-YAP/TAZ+100μmol/L Crocin干预)。qRT-PCR法检测YAPmRNA、TAZ mRNA表达;EdU染色、流式细胞仪分别检测细胞增殖、凋亡情况;Western blot检测细胞中增殖细胞核抗原(PCNA)、Bcl-2相关X蛋白(Bax)、细胞抗凋亡因子B...     

藏红花素促进颈动脉损伤小鼠体内EPCs动员及损伤血管的再内皮化

目的:研究藏红花素对颈动脉损伤小鼠外周血中内皮祖细胞(endothelial progenitor cells,EPCs)动员的影响及其作用机制。方法:利用导丝损伤的方法构建C57BL/6小鼠颈动脉损伤模型,动物分为假手术组(sham组)、生理盐水处理模型组(model组)和藏红花素低、中、高剂量(10、50和100μmol·kg~(-1)·L~(-1))处理组。在3 d时,利用流式细胞术检测各组颈动脉损伤小鼠体内外周血中EPCs动员情况;7 d时,利用酶联免疫吸附法检测各组颈动脉损伤小鼠外周血血清中促血管修复因子——血管内皮生长因子(vascular endothelial growth factor,VEGF)、基质细胞衍生因子1(stromal-derived factor-1,SDF-1)、碱性成纤维细胞生长因子(basic fibroblast growth factor,bFGF)、表皮生长因子(epidermal growth factor,EGF)和基质金属蛋白酶9(matrix metalloproteinase-9,MMP-9)的含量变化;14 d时,利用依文思蓝和苏木精-伊红染色分别检测各组颈动脉损伤小鼠损伤血管再内皮化和内膜增生情况;同时采用real-time PCR检测各组颈动脉损伤小鼠损伤段血管中促修复因子相关受体——血管内皮生长因子受体2(vascular endothelial growth factor receptor 2,VEGFR-2)、CXC趋化因子受体4(CXC chemokine receptor-4,CXCR4)、碱性成纤维细胞生长因子受体(basic fibroblast growth factor receptor,bFGFR)和表皮生长因子受体(epidermal growth factor receptor,EGFR)的mRNA表达水平。结果:与sham组相比,model组颈动脉损伤小鼠外周血中EPCs动员量和促血管修复因子VEGF、SDF-1、bFGF、EGF、MMP-9的含量上升(P0.05);损伤血管再内皮化面积下降而增生内膜面积和增生内膜与中层膜面积比显著升高(P0.05);损伤段血管中促修复因子相关受体VEGFR-2、CXCR4、bFGFR和EGFR的表达水平亦上升(P0.05)。而与model组相比,不同浓度藏红花素处理组颈动脉损伤小鼠外周血中EPCs动员量和促血管修复因子VEGF、SDF-1、bFGF、EGF、MMP-9含量均显著上升(P0.05);损伤血管再内皮化面积逐渐上升而增生内膜面积和增生内膜与中层膜面积比逐渐下降(P0.05);损伤段血管中促修复因子相关受体基因VEGFR-2、CXCR4、bFGF-R和EGFR的表达水平随之逐渐上升(P0.05)。结论:藏红花素能够促进颈动脉损伤小鼠体内EPCs细胞动员及损伤血管的再内皮化,从而对损伤血管发挥修复作用。     

藏红花素对人脐静脉内皮细胞增殖及细胞外调节蛋白激酶信号通路的影响

目的观察藏红花素(crocin)对人脐静脉内皮细胞(HUVECs)体外增殖、细胞外调节蛋白激酶(ERK)1/2表达及活性的影响。方法用藏红花素及MAPK/ERK激酶(MEK)抑制剂PD98059分别处理HUVECs,Ed U细胞增殖法检测细胞体外增殖活力,Western blotting法检测crocin对磷酸化细胞外调节蛋白激酶1/2(ERK1/2)和总ERK1/2表达的影响,激光扫描共焦显微镜检测细胞内Ca~(2+)浓度。结果在1μmol/L和10μmol/L浓度水平,藏红花素可明显促进细胞的增殖能力,提高磷酸化ERK1/2和总ERK1/2蛋白的表达水平,并增加细胞内Ca~(2+)浓度;给予MEK抑制剂PD98059后,细胞的增殖能力下降,磷酸化ERK1/2和总ERK1/2的表达减弱,细胞内Ca~(2+)浓度降低。结论藏红花素通过活化ERK1/2信号途径,提高细胞内Ca~(2+)浓度,促进人脐静脉内皮细胞的体外增殖能力。     

藏红花素保护溃疡性结肠炎模型大鼠的作用及相关机制

文题释义：溃疡性结肠炎：一种非特异性结直肠炎性病变,病变部位多位于乙状结肠和直肠,可蔓延至降结肠,甚至整个结肠,病变多局限于黏膜和黏膜下层,以血性腹泻为常见症状,病情反复,病程漫长。藏红花素：是提取自番红花的单糖基或二糖基多烯酯,属于水溶性类胡萝卜素化合物。背景：藏红花素具有抗炎、抗氧化应激等作用,但对于溃疡性结肠炎治疗作用及相关机制研究仍不明确。目的：探讨藏红花素对溃疡性结肠炎大鼠的保护作用及相关机制。方法：将SD大鼠30只随机分为5组,正常组、模型组、藏红花素低剂量组、藏红花素高剂量组、阳性对照组。采用葡聚糖硫酸钠诱导法构建溃疡性结肠炎大鼠模型,并采用藏红花素0.05,0.1 g/kg灌胃干预。阳性对照组给予柳氮磺嘧啶灌胃。结果与结论：①形态学评估：干预1周后,与模型组大鼠相比,藏红花素干预的各组大鼠灌胃后结肠组织损伤评分、大鼠结肠疾病活动指数评分显著降低(P < 0.05);②氧化应激水平检测显示,与模型组相比,藏红花素干预的各组大鼠结肠组织丙二醛含量及髓过氧化物酶活性降低(P < 0.05),超氧化物歧化酶活性升高(P < 0.05);③免疫组织化学染色显示,与模型组相比,藏红花素干预的各组大鼠1周后肿瘤坏死因子α和白细胞介素23蛋白免疫反应下降(P < 0.05);④免疫印迹蛋白检测显示,与模型组相比,藏红花素干预的各组大鼠肠组织总蛋白Bax、Caspase-3、Toll样受体4及MyD88的表达水平蛋白表达下调(P < 0.05),Bcl-2蛋白表达上调(P < 0.05);⑤结果说明藏红花素对溃疡性结肠炎大鼠有一定的治疗作用,其机制可能与下调Toll样受体4/MyD88信号通路及抑制结肠的氧化应激、炎症反应及细胞凋亡有关。ORCID: 0000-0002-1941-1235(杨敏杰)中国组织工程研究杂志出版内容重点：组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程     

藏红花素调控Nrf2/HO-1通路对痔疮模型大鼠肛周病理组织形态及炎症反应的影响

目的 探讨藏红花素对痔疮模型大鼠肛周病理组织形态及炎症反应的影响以及核转录因子E2相关因子2(Nrf2)/血红素加氧-1(HO-1)通路发挥的作用。方法 采用醋酸贴敷法构建大鼠急性痔疮模型;将造模成功大鼠分为模型组、阳性组和低、中、高剂量（L、M、H）藏红花素组、藏红花素+ML385(Nrf2抑制剂)组,每组10只,并取10只大鼠设为对照组;给药1周后,肛周组织病变评分;ELISA检测血清中炎症因子水平;血常规检测血液中白细胞、淋巴细胞、中性粒细胞水平;HE染色检测肛周病理组织形态变化;Western blot检测肛周组织中Nrf2、HO-1蛋白水平。结果 与对照组比较,模型组大鼠肛周黏膜上皮坏死、有出血、炎性细胞浸润,肛周组织病变评分、血清中IL-1β、TNF-α、IL-6水平,血液中白细胞、淋巴细胞、中性粒细胞数显著升高,肛周组织Nrf2、HO-1蛋白水平显著降低（P<0.05）;与模型组比较,阳性组肛周组织病变评分、血清中IL-1β、TNF-α、IL-6水平、藏红花素-L、M、H组大鼠肛周组织损伤明显改善,腺体整齐排列、炎性浸润减轻、出血减轻,肛周组织病变评分、血清IL-1...     

蓖麻蚕蛹生物反应器生产重组人表皮生长因子的研究

重组人表皮生长因子(rhEGF)已经广泛应用于医疗和化妆品。以杆状病毒AnpeNPV为基因表达载体,昆虫为生物反应器而建立的蛋白表达系统已获得成功。本文以人表皮生长因子(hEGF)基因替代柞蚕AnpeNPV中的核多角体基因而获得的AnpehEGF病毒为载体、蓖麻蚕蛹为生物反应器表达的rhEGF蛋白质,采用PCR、West-ern blot和ELISA等实验方法对其进行检测,硫酸铵沉淀和Ni-NTA Agrose亲和层析法对其进行分离纯化。实验结果显示,无论是在基因或是蛋白水平上都可检测到rhEGF的表达。AnpehEGF感染蚕蛹后第6d开始检测到rhEGF的表达量快速上升,第12d达到高峰,第3、6、9、12d的表达量分别为19.77、24.90、618.59、1 952.46ng/g,而到了病毒感染后期(第15d)出现了蛋白降解现象。表达的rhEGF通过分离纯化获得了较纯的产品。结果表明蓖麻蚕蛹作为生物反应器生产外源蛋白rhEGF是可行的,说明利用AnpeNPV和蓖麻蚕蛹可开发更加低成本而又高效的rhEGF生产新途径。     

血液流体动力学研究与生物反应器在组织工程血管构建的应用

利用生物反应器构建组织工程化血管是近年来诞生的一项新技术。本文综述了其理论基础即血液流体动力学的研究进展,生物反应器的原理、结构、应用及评估,同时提出存在的问题并展望其应用前景。     

应用搅拌式生物反应器大量扩增人胎盘间充质干细胞的实验研究

探讨应用搅拌式生物反应器培养技术体外扩增人胎盘间充质干细胞(hPDMCs)的方法.以 hPDMCs为种子细胞,利用微载体悬浮法在搅拌式生物反应器内进行体外培养,同时设置静态培养的培养瓶为对照组,观察细胞的扩增速率、细胞代谢(乳酸、葡萄糖、培养液的pH值)的变化,检测生物反应器培养前、后干细胞的表面标记物.hPDMCs 在搅拌式生物反应器内每代可以扩增 (10.55±1.62) 倍,明显高于对照组 (6.10±0.11) 倍的扩增值(P＜0.05),且细胞生长代谢指标优于对照组;流式细胞仪检测应用搅拌式生物反应器,培养后细胞表面标记物的表达率无明显改变(P>0.05). 搅拌式生物反应器能够提供良好的细胞生长环境,建立用于 hPDMCs 的大量扩增的体外三维培养体系.     

应用生物素-亲和素系统检测胸水特异性IgG抗体的研究

应用亲和素—生物素化过氧化物酶复合物酶联免疫吸附试验(ABC-ELISA)检测159份结核性胸水和82份对照胸水中的抗PPD—IgG,并在同一滴定板上做常规ELISA对比。结果表明在82.4％的胸水中,ABC—ELISA较常规ELISA敏感,前者的抗体几何平均滴度为后者的2.4倍。本法敏感性为90.6％,特异性为95.1％,提示可作为结核性胸膜炎的辅助诊断方法。动态观察尚可为疗效判定提供依据。     

Microencapsulated Saccharomyces cerevisiae column bioreactor for potential use in renal failure uremia

A novel bioreactor containing viable APA microencapsulated yeast cells was designed. Rat plasma was used for perfusion. Yeast cell loading and perfusion flow rate were studied to maximize urea removal. An increase in column loading from 25% to 100%, increased urea removal from 5.67 ± 1.34% to 30.45 ± 0.48%. An increase in flow rate from low to high, increased urea removal from 30.46% to 40.4%. At 100% column loading and high flow rate, the creatinine and phosphate concentrations decreased by 22% and 10%, respectively, while ammonia concentrations increased by 58.9% (p < 0.05). Our in-vitro perfusion study demonstrates that microencapsulated yeast cells can remove urea efficiently.     

KCa3.1在藏红花素促进人脐静脉内皮细胞NO生成过程中的调节作用

目的观察藏红花素(crocin)对人脐静脉内皮细胞(HUVECs)体外eNOS表达及NO生成的影响以及。方法用crocin及KCa3.1选择性阻断剂tram34分别处理HUVECs,NO荧光探针DAF-FM DA检测HUVECs细胞中NO的表达, Western blot法检测磷酸化一氧化氮合酶(peNOS)和总一氧化氮合酶(t-eNOS)的表达。结果 crocin明显促进细胞内NO的生成,提高p-eNOS和t-eNOS蛋白的表达水平;在KCa3.1选择性阻断剂tram34的干预下,crocin对于HUVECs中NO及eNOS的上调作用被明显抑制。结论藏红花素促进内皮细胞eNOS介导的NO生成与KCa3.1信号通路相关。     

Production of recombinant adeno-associated vectors using two bioreactor configurations at different scales

The conventional methods for producing recombinant adeno-associated virus (rAAV) rely on transient transfection of adherent mammalian cells. To gain acceptance and achieve current good manufacturing process (cGMP) compliance, clinical grade rAAV production process should have the following qualities: simplicity, consistency, cost effectiveness, and scalability. Currently, the only viable method for producing rAAV in large-scale, e.g. > or =10(16) particles per production run, utilizes baculovirus expression vectors (BEVs) and insect cells suspension cultures. The previously described rAAV production in 40 L culture using a stirred tank bioreactor requires special conditions for implementation and operation not available in all laboratories. Alternatives to producing rAAV in stirred tank bioreactors are single-use, disposable bioreactors, e.g. Wave. The disposable bags are purchased pre-sterilized thereby eliminating the need for end-user sterilization and also avoiding cleaning steps between production runs thus facilitating the production process. In this study, rAAV production in stirred tank and Wave bioreactors was compared. The working volumes were 10 L and 40 L for the stirred tank bioreactors and 5 L and 20 L for the Wave bioreactors. Comparable yields of rAAV, approximately 2E+13 particles per liter of cell culture were obtained in all volumes and configurations. These results demonstrate that producing rAAV in large scale using BEVs is reproducible, scalable, and independent of the bioreactor configuration.     

Ethosomes and organogels for cutaneous administration of crocin

The present study describes the production and characterization of phosphatidylcholine based ethosomes and organogels, as percutaneous delivery systems for crocin. Crocin presence did not influence ethosome morphology, while the drug slightly increased ethosome mean diameter. Importantly, the poor chemical stability of crocin has been found to be long controlled by organogel. To investigate the performance of phosphatidylcholine lipid formulations as crocin delivery system, in vivo studies, based on tape stripping and skin reflectance spectrophotometry, were performed. Tape stripping results suggested a rapid initial penetration of crocin exerted by the organogel, probably due to a strong interaction between the peculiar supramolecular aggregation structure of phospholipids in the vehicle and the lipids present in the stratum corneum and a higher maintenance of crocin concentration in the case of ethosomes, possibly because of the formation of a crocin depot in the stratum corneum. Skin reflectance spectrophotometry data indicated that both vehicles promoted the penetration of crocin through the skin, with a more rapid anti-inflammatory effect exploited by ethosomes, attributed to an ethanol pronounced penetration enhancer effect and to the carrier system as a whole.     

Monitoring the surface tension of lipid membranes by a bubble method

A new method for the determination of lipid membrane surface tension was developed. Advantages of this method are that it allows for multiple measurements on a single membrane, is fast and direct not requiring empirical corrections, may be applied for dynamical surface-tension measurements and may be used with thin films and asymmetrical electrolytes. The pressure and radius of a bubble are measured. A piezoresistive sensor is used to minimize the transducer compliance. By moulding the sensor to a brass plate a resolution of 0.025 mm H₂O (0.25 Pa) is obtained. The bubble is filmed using a videocamera and the radius of the bubble determined with the aid of a microcomputer. Data for monoolein/ hexadecane in potassium chloride solutions and a cooling curve are presented and compared with previous results.     

Production and release of infectious hepatitis C virus from human liver cell cultures in the three-dimensional radial-flow bioreactor

Lack of efficient culture systems for hepatitis C virus (HCV) has been a major obstacle in HCV research. Human liver cells grown in a three-dimensional radial-flow bioreactor were successfully infected following inoculation with plasma from an HCV carrier. Subsequent detection of increased HCV RNA suggested viral replication. Furthermore, transfection of HCV RNA transcribed from full-length cDNA also resulted in the production and release of HCV virions into supernatant. Infectivity was shown by successful secondary passage to a new culture. Introduction of mutations in RNA helicase and polymerase regions of HCV cDNA abolished virus replication, indicating that reverse genetics of this system is possible. The ability to replicate and detect the extracellular release of HCV might provide clues with regard to the persistent nature of HCV infection. It will also accelerate research into the pathogenicity of HCV, as well as the development of prophylactic agents and new therapy.     

Replacement of bone marrow by bone in rat femurs: the bone bioreactor

During development and repair of bone, two distinct yet complementary mechanisms, intramembranous and endochondral, mediate new bone formation via osteoblasts. Because mechanical bone marrow ablation leads to the rapid and transient formation of new bone in the marrow cavity, we postulated that parathyroid hormone (PTH), which is a bone anabolic hormone, enhances the formation of new bone that forms after marrow ablation. We subjected the left femur of rats to mechanical marrow ablation, or sham operation, and injected the animals daily with PTH or vehicle for 1, 2, or 3 weeks in a first experiment, then with PTH, parathyroid hormone-related peptide (PTHrP), or vehicle for 3 weeks in a second experiment. We subjected both femurs from each rat to soft X-ray, peripheral quantitative computed tomography, computed tomography on a microscale, and histological analysis, and determined the concentration of serum osteocalcin. In addition, in the second experiment, we determined the serum concentration of calcium, tartrate-resistant acid phosphatase (TRAP), and receptor activator of NF-kappaB ligand (RANKL) at 3 weeks, and subjected femurs to biomechanical testing. Following treatment with PTH or PTHrP for 3 weeks, bone filled the marrow cavity of the shafts whose marrow had been ablated. PTH increased trabecular density in the right femur, but failed to induce bone formation in the medullary region of the right unoperated femoral shafts. The newly formed bone endowed left femoral shafts with improved biomechanical properties when compared to those of right femurs and left femurs from control, sham-operated, and vehicle-treated rats. PTHrP, like PTH, increased serum osteocalcin, but neither increased serum calcium, TRAP, or RANKL at 3 weeks. Our results reveal that the newly formed bone that follows marrow ablation is responsive to PTH, expand the role of PTH in bone, and might open new avenues of investigations to the field of regenerative medicine and tissue engineering. Local bone marrow removal in conjunction with pharmacologic intervention with an anabolic agent might provide a technique for rapid preferential site-directed bone growth in areas of high bone loss.