ABSTRACT
OBJECTIVE@#The prepare decellularized extracellular matrix (ECM) scaffold materials derived from human cervical carcinoma tissues for 3D culture of cervical carcinoma cells.@*METHODS@#Fresh human cervical carcinoma tissues were treated with sodium lauryl ether sulfate (SLES) solution to prepare decellularized ECM scaffolds. The scaffolds were examined for ECM microstructure and residual contents of key ECM components (collagen, glycosaminoglycan, and elastin) and genetic materials by pathological staining and biochemical content analysis. In vitro 3D culture models were established by injecting cultured cervical cancer cells into the prepared ECM scaffolds. The cells in the recellularized scaffolds were compared with those in a conventional 2D culture system for cell behaviors including migration, proliferation and epithelial-mesenchymal transition (EMT) wsing HE staining, immunohistochemical staining and molecular biological technology analysis. Resistance to 5-fluorouracil (5-Fu) of the cells in the two culture systems was tested by analyzing the cell apoptosis rates via flow cytometry.@*RESULTS@#SLES treatment effectively removed cells and genetic materials from human cervical carcinoma tissues but well preserved the microenvironment structure and biological activity of ECM. Compared with the 2D culture system, the 3D culture models significantly promoted proliferation, migration, EMT and 5-Fu resistance of human cervical cancer cells.@*CONCLUSION@#The decellularized ECM scaffolds prepared using human cervical carcinoma tissues provide the basis for construction of in vitro 3D culture models for human cervical cancer cells.
Subject(s)
Female , Humans , Decellularized Extracellular Matrix , Extracellular Matrix , Uterine Cervical Neoplasms , Tissue Scaffolds/chemistry , Carcinoma , Fluorouracil/pharmacology , Tissue Engineering , Tumor MicroenvironmentABSTRACT
Development of "liquid sunshine" could be a key technology to deal with the issue of fossil fuel depletion. β-caryophyllene is a terpene compound with high energy density and has attracted attention for its potential application as a jet fuel. The high temperature and high light-tolerant photosynthetic cyanobacterium Synechococcus elongatus UTEX 2973 (hereafter Synechococcus 2973), whose doubling time is as short as 1.5 h, has great potential for synthesizing β-caryophyllene using sunlight and CO₂. In this study, a production of ~121.22 μg/L β-caryophyllene was achieved at 96 h via a combined strategy of pathway construction, key enzyme optimization and precursor supply enhancement. In addition, a final production of ~212.37 μg/L at 96 h was realized in a high-density cultivation. To our knowledge, this is the highest production reported for β-caryophyllene using cyanobacterial chassis and our study provide important basis for high-density fuel synthesis in cyanobacteria.
Subject(s)
Biofuels/microbiology , Carbon Dioxide/metabolism , Light , Photosynthesis , Synechococcus/radiation effectsABSTRACT
Most non-small cell lung cancer patients with active epidermal growth factor receptor (EGFR) mutation will eventually acquire drug resistant to EGFR tyrosine kinase inhibitors, such as gefitinib, resulting in disease progression, which involves a variety of complex mechanisms. Up to now, the molecular mechanisms of long non-coding RNAs mediated EGFR-TKIs resistance remains poorly understood. This review aims to outline the current state of information on lncRNAs and progress on its role in EGFR-TKIs resistance in non-small cell lung cancer.
Subject(s)
Humans , Carcinoma, Non-Small-Cell Lung , Drug Therapy , Genetics , Drug Resistance, Neoplasm , Genetics , ErbB Receptors , Lung Neoplasms , Drug Therapy , Genetics , Protein Kinase Inhibitors , Pharmacology , Therapeutic Uses , RNA, Long Noncoding , GeneticsABSTRACT
Objective To study the therapeutic effect of three dimensional valve prosthetic ring treatment of tricuspid incompetence at the same time in the replacement of mitral valve in patients with rheumatic mitral valve disease combined with tricuspid incompetence.Methods Eighteen patients with rheumatic mitral valve disease combined with tricuspid incompetence were given three dimensional valve prosthetic ring treatment of tricuspid incompetence at the same time in the replacement of mitral valve as treatment group.The same period 18 patients selected as control group,they were given De Vega purposes banding surgery at the same time in the replacement of mitral valve.The index of operation and echocardiogram after 2 weeks and 6 months were observed and compared.Results Two groups of patients were discharged.Right atrium transverse diameter,right ventricle transverse diameter and tricuspid regurgitation by ultrasonic examination after 2 weeks and 6 months were significantly improved,there were statistical differences (P ＜ 0.05),and the indexes in treatment group were significantly better than those in control group,there were statistical differences (P ＜ 0.05).Conclusion Three dimensional valve prosthetic ring in the treatment of tricuspid incompetence is safe and effective.
ABSTRACT
Objective To observe the bipolar radiofrequency ablation maze procedure (BRAMP) combined with heart valve replacement for rheumatic heart disease (RHD) complicated with atrial fibrillation (AF), and discuss the curative effect of the new operation method. Methods Fifteen patients with RHD complicated with AF were treated with heart valve replacement and BRAMP (treatment group). At the same time, 15 patients with RHD complicated with AF were only heart valve replacement without BR AMP(control group). Results Treatment group were all cured, and they had the sinoatrial rhythm after operation.Followed up 6 months, 14 patients maintained sinus rhythm,one had AF occasionally. In control group, 13 patients had AF after operation,2 patients had the sinoatrial rhythm after operation, but they tumed to AF one or two days later,and amiodarone hydrochloride had no effect to them. The two groups had obvious differences in the length of left atria, the length of left ventricle, the size of the heart, the function of the heart and LVEF before and after operation (P ＜ 0.01 or ＜ 0.05). But in treatment group, the length of left atria and the size of the heart had obvious difference after operation compared with control group [ (31.06 ± 2.28 ) mm vs. (36.16 ±2.23) mm,t = 11.645,P =0.002; (50 ±9)% vs. (56 ± 10)% ,t =8.052,P =0.008].Conclusion Compared with the operation that heart valve replacement without BRAMP,BRAMP is simple and little, should be promising.
ABSTRACT
Cyanobacteria are simple organisms which possess an endogenous circadian clock.Although the cyanobacterial clock has the same fundamental properties as circadian clocks in eukaryotes,its components are non-homologous to those of eukaryotes.The clock core of the cyanobacteria consists of the kai gene cluster and three Kai proteins KaiA,KaiB and KaiC,which the kai genes encode.The interactions among the Kai proteins modulate the phosphorylation state of KaiC,which generates circadian rhythm.The KaiC phosphorylation cycle constitutes the pacemaker of the cyanobacterial circadian rhythm.And signal transduction into and out of the clock core could occur via histidine protein kinase-based phosphorylation relays.
ABSTRACT
Objective To study and analyze technology of proxy server,VPN and specific remote access system.Methods The application of digital medical library was studied in such four aspects as adaptability,security,accessibility and extensibility.Result Many approaches were put forward to break the limits of IP address and realize remote access to digital resources.Conclusion In order to meet the actual requirements in the remote access of digital medical library,the following rules should be observed: the technical scheme with obvious functional limitations should be avoided;importance should be laid on mutual sharing and remote access between chief library and branch library;the maximum concurrent access should be born;multiple certification methods should be utilized as well as multiple techniques such as information distributing.
ABSTRACT
Object To investigate the preparation technique and optimal formulation of Breviscapin Sustained release Pellets (BSP) and the release mechanism of breviscapin from the pellets. Methods BSP was prepared by extrusion spheronization method. Based on the studies of influential factors, optimal formulation modified to release drug over 12 h was obtained by the orthogonal design. And release mechanism of breviscapin from BSP was established by equation fitting. Results Prepared BSP has such advantages as simple technique, uniformity in diameters and high loading with even contents. They can release drug for 12 h. And the release of breviscapin could be mainly controlled by diffusion associated with slight erosion. Conclusion Extrusion spheronization method is simple for the preparation of BSP, and useful for the large scale prodution.
ABSTRACT
OBJECTIVE: To evaluate the efficacy and safety of Pravastatin versus Simvastatin in downregulating low density lipoprotein cholesterol(LDL-C) and upregulating high density lipoprotein cholesterol(HDL-C).METHODS: A total of 66 patients with hypercholesterolemia were enrolled: 33 were randomly assigned to receive Pravastatin(40 mg) for 6 weeks,and another 33 to receive Simvastatin(40 mg) for 6 weeks.Serum lipid levels at baseline and 6 weeks after medication were measured.The primary effective indicator was LDL-C as compared with baseline value and the secondary effective indicator was HDL-C.Safety was evaluated based on laboratory data and clinical adverse reactions.RESULTS: Both Pravastatin and Simvastatin significantly decreased LDL-C level,showing significant differences as compared with before medication(P0.05).Less adverse drug reactions were noted in both groups.CONCLUSION: Pravastatin and Simvastatin were equivalent in lipid-regulatory effect and both were well-tolerated.