Fura-2/AM荧光探针法用于大肠杆菌胞内游离钙的测定

目的探讨经超声处理后大肠杆菌胞内游离钙的变化。方法超声波作用影响大肠杆菌,用Fura-2/AM探针法测定胞内游离钙的变化。结果经超声作用后的大肠杆菌胞内游离钙水平升高,打开了钙依赖性的离子通道,膜两侧离子交流加速,膜通透性增加。结论Fura-2/AM荧光探针法可用于微生物大肠杆菌胞内游离钙的测定。经一定条件下超声作用后的大肠杆菌胞内游离钙水平升高。     

一种核酸适配体高敏检测方法的建立及应用评价

本文建立一种基于免疫印迹的核酸适配体高敏定量分析的检测方法,并探讨其在适配体药物靶向性研究中的应用价值。首先用聚丙烯酰胺凝胶电泳进行核酸适配体的分离,然后利用电转的方法将凝胶上的核酸适配体转移至PVDF膜上,先后孵育Rabbit Anti-Biotin和HRP-Streptavidin抗体,最后利用化学发光仪进行成像。结果显示核酸适配体可以通过该方法进行定量检测分析,且该方法检测灵敏度高,能够识别荧光染料法检测不到的浓度范围。此外,该方法只识别被生物素修饰的核酸适配体,特异性强。结果提示,核酸免疫印记法可以作为核酸适配体药物靶向性研究的一个定量检测手段。     

Protective effect of polypeptides from larva of housefly (Musca domestica) on hydrogen peroxide-induced oxidative damage in HepG2 cells

Housefly (Musca domestica) is an important medical insect and its larva is an ideal high protein food source. We isolated from housefly larvae the polypeptides hydrolyzed by neutral protease (PHNP), and investigated the protective effect of PHNP on hydrogen peroxide (H₂O₂)-induced oxidative damage in HepG2 cells. Cells exposed to H₂O₂ showed a marked decrease in proliferation and intracellular superoxide dismutase (SOD) activity, and a significant increase in reactive oxygen species (ROS) level and malondialdehyde (MDA) content. H₂O₂ also caused apoptosis and mitochondrial dysfunction including mitochondrial fragmentation and the loss of mitochondrial membrane potential. Pretreatment with PHNP at concentrations of 2.5, 5, 10 μg/mL blocked these H₂O₂-induced cellular events in a dose-dependent manner. The effect of PHNP at 10 μg/mL is equal to that of ascorbic acid at 10 μM. In summary, PHNP has a protective effect against H₂O₂-induced oxidative injury in cells due to its ability to decrease intracellular ROS and elevate antioxidant enzyme activities.     

Pilot study on efficacy of reduced cathartic bowel preparation with polyethylene glycol and bisacodyl

AIM:To evaluate the efficacy of reduced cathartic bowel preparation with 2 L polyethylene glycol(PEG)-4000 electrolyte solution and 10 mg bisacodyl enteric-coated tablets for computed tomographic colonography(CTC).METHODS:Sixty subjects who gave informed consent were randomly assigned to study group A,study group B or the control group.On the day prior to CTC,subjects in study group A were given 20 mL 40% wt/vol barium sulfate suspension before 3 mealtimes,60 mL 60% diatrizoate meglumine diluted in 250 mL water after supper,and 10 mg bisacodyl enteric-coated tablets 1 h before oral administration of 2 L PEG-4000 electrolyte solution.Subjects in study group B were treated identically to those in study group A,with the exception of bisacodyl which was given 1 h after oral PEG-4000.Subjects in the control group were managed using the same strategy as the subjects in study group A,but without administration of bisacodyl.Residual stool and fluid scores,the attenuation value of residual fluid,and discomfort during bowel preparation in the three groups were analyzed statistically.RESULTS:The mean scores for residual stool and fluid in study group A were lower than those in study group B,but the differences were not statistically significant.Subjects in study group A showed greater stool and fluid cleansing ability than the subjects in study group B.The mean scores for residual stool and fluid in study groups A and B were lower than those in the control group,and were significantly different.There was no significant difference in the mean attenuation value of residual fluid between study group A,study group B and the control group.The total discomfort index during bowel preparation was 46,45 and 45 in the three groups,respectively,with no significant difference.CONCLUSION:Administration of 10 mg bisacodyl enteric-coated tablets prior to or after oral administration of 2 L PEG-4000 electrolyte solution enhances stool and fluid cleansing ability,and has no impact on the attenuation value of residual fluid or the discomfor     

加味温胆汤治疗自发性高血压大鼠Ⅰ、Ⅲ型胶原及AngⅡ的影响

目的:本课题旨在探讨加味温胆汤与开博通(卡托普利)联用对自发性高血压大鼠(SHR)血压Ⅰ、Ⅲ型胶原及AngⅡ的影响。方法:将48只10周龄雄性SHR随机分为6组,分别为SHR对照组(SHR-K)、加味温胆汤高剂量和开博通联合用药组(ZX-H)、加味温胆汤中剂量和开博通联合用药组(ZX-M)、加味温胆汤低剂量和开博通联合用药组(ZX-L)、加味温胆汤中剂量组(Z)及开博通组(X),每组8只,治疗8周后,测量大鼠尾动脉收缩压,观察Ⅰ、Ⅲ型胶原及AngII的改变。结果:加味温胆汤和开博通联用药治疗后,各剂量组大鼠收缩压均有所下降。加味温胆汤和开博通联用药高、中剂量组大鼠下降最明显(P<0.01),且降压效果优于加味温胆汤中剂量及开通博;各治疗组均可显著降低SHR大鼠左心室心肌组织胶原Ⅰ、Ⅲ型蛋白的表达,温胆汤和开博通联合用药组作用显著,明显优于纯中药组和西药开博通组;局部心肌AngⅡ与自然病程对照组相比,各药物治疗组均可明显降低局部心肌AngⅡ浓度(P<0.05),其中加味温胆汤大剂量与开博通联合用药组效果最佳,与自然病程对照组相比,各药物治疗组均可明显降低血浆AngⅡ浓度(P<0.01~0.05)。其中加味温胆汤各剂量与开博通联合用药组作用相似,降低血AngⅡ最显著,均优于加味温胆汤与开博通单用组(P<0.01~0.05)。结论:味温胆汤和开博通联合用药具有降压、降低左心室心肌组织胶原Ⅰ、Ⅲ型蛋白的表达及降低血浆和心肌肉组织中AngⅡ的浓度。     

Exploiting a Modified Gray Model in Back Propagation Neural Networks for Enhanced Forecasting

Back propagation (BP) neural network has been widely used for various data predictions in application. One of the challenging issues in various applications of BP neural network is how to improve its reliability as well as its stability. In this paper, by using a prototype for the forecast of atmospheric radiation and atmospheric ozone concentration in the state of Ohio, USA, we show that a direct use of the BP neural network may lead to the loss of forecast reliability during its evolutionary process. Under the framework of Verhulst biological model with embedding cognitive computation, we show that one can effectively reduce the dispersion of pure randomness of data sets in BP neural network and improve the prediction of future data by incorporating accumulation generation operation (AGO) into the system. We demonstrate that the integration of a modified gray model and the AGO can offer a more desirable BP neural network algorithm, and both stability and reliability become much improved compared to the direct use of BP neural network reported in current literature.     

Formula PSORI-CM01 inhibits the inflammatory cytokine and chemokine release in keratinocytes via NF-κB expression

Psoriasis is a common chronic inflammatory disease in which T-helper 1(Th1) and T-helper 17(Th17) cells play an important role in its pathology. Formula PSORI-CM01 was a novel formulated Chinese medicine used for psoriasis therapy. It had been demonstrated previously that PSORI-CM01 and serum contained Formula PSORI-CM01 (PCM01CS) could improve psoriasis by inhibiting the epithelial hyperplasia, how PSORI-CM01 affects inflammatory cytokine and chemokine in dermis is still unknown. In this study we found PSORI-CM01 pre-treated 3 days before IMQ painting could ameliorated IMQ-induced mice skin lesion as PASI score was apparently reduced. Th1 related cytokine IFN-γ and Th17 related cytokine IL-17/IL-22 was used to induce inflammatory models on human keratinocyte cell line HaCaT in vitro, respectively. PCM01CS significantly reduced IFN-γ induced mRNA expression of IL-6, IL-12 and CXCL-10, reduced IL-6 and CXCL-10 release into HaCaT supernatant. 20 ng/ml IL-17/IL-22 co-stimulation significantly upregulated expression of IL-6, IL-8 and CCL20 mRNA expression in HaCaT cells, PCM01CS significantly inhibit these cytokines expression both in mRNA and in protein levels. Finally, PCM01CS could obviously inhibit nuclear NF-κB p65 expression which activated by IFN-γ and IL-17/IL-22 stimulation. Thus, our new findings reveal that Formula PSORI-CM01 may possess therapeutic action on psoriasis by inhibiting inflammatory within skin environments.     

补中益气汤对脾虚大鼠胃粘膜EGFR蛋白表达的影响

目的:观察脾虚大鼠胃粘膜EGFR蛋白表达的变化及补中益气汤对其的影响,并探讨相关机制。方法:SD大鼠称重随机分组,分为设空白对照组、脾虚损伤组、补中益气汤组、非脾虚损伤组。脾虚损伤组、补中益气汤组大鼠给予100%大黄水煎剂灌胃,一天2次,连续10天,第11天补中益气汤组给予补中益气汤灌胃治疗7天,第18天,除空白对照组外的另外三组均灌服消炎痛造成胃粘膜损伤。采用免疫组化法检测EGFR蛋白表达的变化。结果:与非脾虚损伤组比较,脾虚损伤组大鼠胃粘膜EGFR蛋白表达明显下调;与脾虚损伤组比较,补中益气汤组大鼠胃粘膜EGFR蛋白表达明显升高。结论:补中益气汤可提高脾虚大鼠消炎痛攻击后EGFR蛋白表达,促进受损胃粘膜的修复,该方对脾虚大鼠胃粘膜易损性复健作用的机制可能与此有关。