重组人类杀菌肽基因在CHO细胞中的表达

目的 检测重组人类杀菌肽基因（BPI）在真核细胞中的表达.方法 采用脂质体转染法将本室构建的pCDNA3.1-BP1500及pCDNA3.1-BPI600重组子导入中国仓鼠卵巢上皮细胞（CHO）,G418筛选出带有重组子的细胞集落,RT-pCR检测BPI在CHO细胞集落中的表达.结果 转染后G418抗性CHO细胞中可检测到BPImRNA的表达.结论 pCDNA3.1-BPI重组子被成功转染至CHO,并得到有效表达.     

尼可地尔治疗冠心病稳定型心绞痛68例

目的:观察尼可地尔对稳定型心绞痛患者心肌缺血及心功能的影响.方法: 68例稳定型心绞痛患者服用尼可地尔治疗 8周,以超声心动图、动态心电图评价患者心肌缺血及心功能等指标.结果:治疗 8周后,患者心肌缺血发作时间及次数明显减少( P < 0.05),心脏指数( CI)、左室射血分数( LVEF)、左室收缩末期容积指数( ESVI)和心房收缩期二尖瓣血流速度比值( E/A)明显优于治疗前( P < 0.05).结论:尼可地尔可明显改善冠心病稳定型心绞痛患者的心肌缺血及心功能.     

Limitations and caveats of magnetic cell labeling using transfection agent complexed iron oxide nanoparticles

Cell labeling with various types of nanomaterial, such as FDA‐approved iron oxide nanoparticles (IONPs) has become common practice in biomedical research. The low uptake of IONPs stimulates the use of transfection agents (TA), but the effect on stability of the IONPs and their cellular interactions has received minimal attention. In the present study, we evaluated the use of Lipofectamine as a commonly used TA and tested different ratios of TA and IONPs. While the TA–IONP complexes are stable in saline, at a high ratio of TA over IONP, substantial aggregation occurred in serum‐containing media. Even for the highest ratio, TA was unable to completely cover the IONPs, resulting in a net negative charge of all complexes. At high TA–IONP ratios, more complexes remained surface‐associated without internalization, resulting in cell death, while at lower TA–IONP ratios, complexes were more avidly taken up through fluid‐phase pinocytosis and clathrin‐mediated endocytosis. At later time points, the endocytosed complexes accumulated within the lysosomes and affected the appearance of lysosomal structures. The data indicate that TAs should be used with care as, depending on the ratio of TA and IONP, the complexes may aggregate, inducing cell death and preventing internalization. Copyright © 2012 John Wiley & Sons, Ltd.     

Single-Molecule hsTnI and Short-Term Risk in Stable Patients With Chest Pain

Background

Evaluation of stable symptomatic outpatients with suspected coronary artery disease (CAD) may be challenging because they have a wide range of cardiovascular risk. The role of troponin testing to assist clinical decision making in this setting is unexplored.

Automated method for detecting and reading seven-segment digits from images of blood glucose metres and blood pressure monitors

Abstract

There is an increasing need for fast and accurate transfer of readings from blood glucose metres and blood pressure monitors to a smartphone mHealth application, without a dependency on Bluetooth technology. Most of the medical devices recommended for home monitoring use a seven-segment display to show the recorded measurement to the patient. We aimed to achieve accurate detection and reading of the seven-segment digits displayed on these medical devices using an image taken in a realistic scenario by a smartphone camera. A synthetic dataset of seven-segment digits was developed in order to train and test a digit classifier. A dataset containing realistic images of blood glucose metres and blood pressure monitors using a variety of smartphone cameras was also created. The digit classifier was evaluated on a dataset of seven-segment digits manually extracted from the medical device images. These datasets along with the code for its development have been made public. The developed algorithm first preprocessed the input image using retinex with two bilateral filters and adaptive histogram equalisation. Subsequently, the digit segments were automatically located within the image by two techniques operating in parallel: Maximally Stable Extremal Regions (MSER) and connected components of a binarised image. A filtering and clustering algorithm was then designed to combine digit segments to form seven-segment digits. The resulting digits were classified using a Histogram of Orientated Gradients (HOG) feature set and a neural network trained on the synthetic digits. The model achieved 93% accuracy on digits found on the medical devices. The digit location algorithm achieved a F1 score of 0.87 and 0.80 on images of blood glucose metres and blood pressure monitors respectively. Very few assumptions were made of the locations of the digits on the devices so that the proposed algorithm can be easily implemented on new devices.     

Overexpression of cytoglobin gene inhibits hypoxic injury to SH-SY5Y neuroblastoma cells

A plasmid for cytoglobin expression, pAcGFP1-C1-cytoglobin, was transfected into SH-SY5Y cells. Cobalt chloride was used to establish a model of hypoxia. Western blotting indicated that cytoglobin was overexpressed and there was low expression of hypoxia-inducible factor-1α in SH-SY5Y cells after transfection. Following cobalt chloride-induced hypoxia, cytoglobin and hypoxia-inducible fac-tor-1α expression gradually increased in SH-SY5Y cells. Flow cytometry showed that with increas-ing duration of hypoxia, the proportion of normal cells significantly diminished in the transfected and non-transfected groups. The proportion of cells in the early stages of apoptosis increased. However, the proportion of apoptotic cells was significantly lower in the transfected group compared with the non-transfected group. These results demonstrate that cytoglobin and hypoxia-inducible factor-1α are strongly up-regulated by hypoxia, and that there is a strong relationship between hy-poxia-inducible factor-1α and cytoglobin during hypoxic injury.     

丹参饮合温胆汤加减对稳定型心绞痛患者心肌缺血的保护机制

目的:观察丹参饮合温胆汤加减治疗痰瘀阻滞型稳定型心绞痛(SAP)的疗效及对心肌缺血的保护机制研究。方法:将132例患者随机按数字表法分为对照组和观察组各66例。除去脱落、失访和剔除病例,两组最后分别完成63例。所有患者进行抗心绞痛药物和控制风险因素药物治疗。对照组口服丹蒌片,5片/次,3次/d;观察组给予丹参饮合温胆汤加减,1剂/d;两组疗程均为治疗3个月。每周进行心绞痛发作情况评分;冠心病心肌缺血情况采用心电图平板运动试验评价,中医症状和生活质量分别进行痰瘀阻滞证、西雅图心绞痛量表(SAQ)评分,血液流变学指标、白细胞介素-6(IL-6),肿瘤坏死因子-α(TNF-α),细胞间黏附分子-1(ICAM-1),胱抑素C(CysC),同型半胱氨酸(Hcy),缺血修饰白蛋白(IMA)和巨噬细胞移动抑制因子(MIF)水平,均治疗前后各评价1次;并进行安全性评价。结果:观察组心绞痛发作次数、持续时间、疼痛程度和硝酸甘油用量评分均低于对照组(P<0.01);观察组Duke评分、总运动时间、出现ST段压低1.0 mm的时间、心绞痛出现时间和代谢当量均多于对照组(P<0.01);观察组SAQ评分高于对照组(P<0.01),痰瘀阻滞证积分低于对照组(P<0.01);观察组心绞痛疗效优于对照组(Z=2.091,P<0.05);观察组ICAM-1,CysC,IL-6,TNF-α水平均低于对照组(P<0.01);观察组全血黏度(低切、高切)、全血还原黏度、血浆黏度、血小板聚集率、纤维蛋白原(FIB)均低于对照组(P<0.01);观察组IMA,Hcy和MIF水平均低于对照组(P<0.01)。没有发现服用丹参饮合温胆汤相关不良反应。结论:在西医常规治疗的基础上,丹参饮合温胆汤加减治疗SAP,可控制心绞痛发作,减轻痰瘀阻滞证症状,提高生活质量,有着较好临床疗效,且安全,并能改善患者血液流变性,抑制炎症反应,减轻管腔狭窄或阻塞,从而改善心肌缺血程度。