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In the middle of December in 2019, a pneumonia outbreak caused by a new coronavirus, 2019 novel coronavirus (2019-nCoV), emerged in the populations in Wuhan city of China. The epidemic spreads rapidly and has been disseminated throughout the country and to 13 other counties in Asia, Europe, Oceania and North America. To accurately and deeply understand the biological characteristics, epidemiological features and pathogenicity of 2019-nCoV and related immunological characteristics, microbiological examinations and public protection measure, this study reviewed 2019-nCoV and 2019-nCoV pneumonia based on the newest relevant literatures and the newest version of National Diagnosis and Treatment Scheme of 2019-nCoV pneumonia.
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In the middle of December in2019, a pneumonia outbreak caused by a new coronavir-us, 2019 novel coronavirus (2019-nCoV), emerged in the populations in Wuhan city of China. The epidem-ic spreads rapidly and has been disseminated throughout the country and to 13 other counties in Asia, Eu-rope, Oceania and North America. To accurately and deeply understand the biological characteristics, epide-miological features and pathogenicity of 2019-nCoV and related immunological characteristics, microbiologi-cal examinations and public protection measure, this study reviewed 2019-nCoV and 2019-nCoV pneumonia based on the newest relevant literatures and the newest version of National Diagnosis and Treatment Scheme of 2019-nCoV pneumonia.
ABSTRACT
In the middle of December in 2019, a pneumonia outbreak caused by a new coronavirus, 2019 novel coronavirus (2019-nCoV), emerged in the populations in Wuhan city of China. The epidemic spreads rapidly and has been disseminated throughout the country and to 13 other counties in Asia, Europe, Oceania and North America. To accurately and deeply understand the biological characteristics, epidemiological features and pathogenicity of 2019-nCoV and related immunological characteristics, microbiological examinations and public protection measure, this study reviewed 2019-nCoV and 2019-nCoV pneumonia based on the newest relevant literatures and the newest version of National Diagnosis and Treatment Scheme of 2019-nCoV pneumonia.
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Objective To establish an HPLC method to determine the related substances of metolazone and valsartan in com?pound metolazone tablets. Methods An Agilent Eclipse SB-C18 column (4.6 mm × 250 mm,5 μm) was used with 0.01 mol/L KH2PO4 buffer(pH=3.5)-acetonitrile as the mobile phase with gradient elution at a flow rate of 1.0 ml/min. The column temperature was 30℃ and the detection wavelength was 237 nm. Injection volume was 20 μl. Results Metolazone,valsartan and related sub?stance B of valsartan were separated completely. The calibration curves were linear within the range of 3-30μg/ml for metolazone, 0.1-2.0μg/ml for valsartan and 0.08-2.0μg/ml for related substane B of valsartan. The average recoveries were 102.97%,100.81%and 100.44%,respectively. The repeatability and intermediate precision met with requirements. The test solution was stable within 24 h. Conclusion The method is specific,sensitive,accurate and reliable,thereby can be used for the determination of metolazone and valsartan related substances in compound metolazone tablets.
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Aim Toinvestigatethepro-angiogenic effects of Danshensu derivative ADTM and explore its underlying possible signaling pathway using zebrafish embryosasinvivomodels.Methods Theangiogenesis activities of ADTM were determined in experimental models of normal and VEGFR tyrosine kinase inhibitorⅡ(VRI )-induced vascular defective zebrafish embry-os.Embryos were treated with various concentrations (50,100,200 μmol · L-1 ) of ADTM for indicated time.The diameter and the numbers of endothelial cells of zebrafish SIVs were evaluated,respectively.In VRI model,the number of intact and defective ISVs in each zebrafish embryo was counted.The total RNA of zebrafish embryos was extracted and transcriptional profiling was analyzed by deep sequencing.Quantita-tive real-time PCR(qPCR)was performed to 4 genes selected from transcriptional profiling to validate the data collected from transcriptome analysis.Results ADTMsignificantlyincreasedsubintestinalvessels (SIVs)diameter in a concentration-dependent manner in normal zebrafish as well as restored VRI-induced blood vessels defect in VRI-exposed zebrafish. The transcriptome data analysis demonstrated that 19 signif-icantly changed genes were mapped to insulin signaling pathway.The qPCR data are in good agreement with those obtained by deep sequencing and support the consistency between the two methods for determining relative expression levels in the zebrafish model.Con-clusion Inzebrafishmodel,ADTMexhibitsthe effects of angiogenesis and blood vessel restoration. The underlying mechanism may be involved in the acti-vation of insulin signaling pathway.
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Objective To investigate the anti-tumor activity of long-circulation thermosensitive liposom-loaded vincristine (VTSL)in vivo and in vitro. Methods The inhibitory effects of VTSL and vincristine injection(VCR)on sw620 cell and PANC cell were detected by MTT assay. The uptake capacity of HT-1080 was studied by using Cou-6-loaded liposome. Different xenograft nude mice models of HepG-2 and MCF-7 were established. To study anti-tumor effect of VTSL,drugs were given via tail and heat therapeu?tic area for 30 minutes,mice weight and tumor weight were recorded. To study anti-tumor effect of VTSL,drugs were given via tail vein and heat therapeutic areas for 30 min,mice body mass and tumor mass were recorded. Results After VTSL was given 72 h,the activ?ity of sw620 and PANC was less than 5%and 20%,respectively. VTSL showed stronger cytotoxic effect than vincristine. At the same dose,tumor inhibitory rate of VCR and VTSL on HepG-2 and MCF-7 bearing nude mice was 50%,69.7%,47.8%and 76.1%,respec?tively. There were significant differences in tumor weight after treatment. Conclusion VTSL enhances the cytotoxicity by heating. Loading vincristine into TSL increased cytotoxicity,and heating could promote the fusion of liposomes and cell membrane. Under the same dosage,VTSL showed much higher tumor inhibition rate than VCR,and there was a certain dose dependence. The results show that VTSL can be used in treatment of solid tumor and has the potential to expand vincristine clinical application.
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Objective To ch aracterize and evaluate in vitro and in vivo of the 10-hydroxycamptothecin (HCPT) loaded human serum albumin nanoparticle (HSA-NP) prepared by drug-liquid compound method. Methods The HCPT-HSA-NP was prepared with low weight polyethylene glycol drug-liquid compound and blank albumin nanoparticle. Then the in vitro evaluations were conducted with tests of entrapment efficiency, solution stability, accumulative release, morphous investigation and X-ray powder diffraction. At the same time, the primary pharmacodynamics comparison between HCPT injection and the nano preparation (8 mg/kg) was carried out on animal tumor model. Results The obtained HCPT-HSA-NP fitted to the basal features of nano preparation. The entrapment efficiency was averagely higher than 99% for each sample and the solution was stable. In vitro accumulative release study showed that the preparation had long-term release pattern over 100 hours. In vivo pharmacodynamics study showed that the HCPT-HSA-NP was significantly more effective than HCPT injection (P<0.01). Conclusion The drug-liquid compound method can be used to prepare HCPT-HSA-NP.
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Nowadays, nanotechnologies have shown wide application foreground in the biomedical field of medicine laboratory tests, drug delivery, gene therapy and bioremediation. However, in recent years, nanomaterials have been labeled poisonous, because of the disputes and misunderstandings of mainstream views on their safety. Besides, for the barriers of technical issues in preparation like: (1) low efficacy (poor PK & PD and low drug loading), (2) high cost (irreproducibility and difficulty in scale up), little of that research has been successfully translated into commercial products. Currently, along with the new theory of "physical damage is the origin of nanotoxicity", biodegradability and biocompatibility of nanomaterials are listed as the basic principle of safe application of nanomaterials. Combining scientific design based on molecular level with precision control of process engineering will provide a new strategy to overcome the core technical challenges. New turning point of translational medicine in nanotechnology may emerge.
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Objective To establish a quick method to analyze vinorelbine ( NVB) in plasma of beagle dogs and study its pharmacokinetics of long-circulation and thermosensitive liposome loaded vinorelbine bitartrate.Methods The plasma was treated with liquid-liquid extraction after precipitation in methanol.The analysis was perfomed on a Venusil XBP C18 column(2.1 mm ×50 mm, 3 μm) at 35℃,the mobile phase consisted of methanol and water( containing 10 mmol/L ammonium acetate, 1%acetonitrile) 80∶20 and injection volume was 10μl.The type of mass spectrum was multireactive monitoring(MRM) in a positive mode.The monitor transitions were m/z 779.4-765.4 for vinorelbine and m/z 825.4-122 for vincristine.Results The concentration range from 10 to 2500 ng/ml had a good linearity ( r=0.0994).The precision, accuracy and extraction efficiency were acceptable.The plasma samples were stable for 10 days at -20℃ and 24 h at room temperature.Pharmacokinetic study in beagle dogs showed that the main parameters for injection and liposome were Cmax(833.51 ±150.42) and (1397.95 ±443.05)ng/ml, AUC(0-t) (577.16 ±223.57) and (1059.82 ±408.27) ng/ml· h, Cl(3014.64 ±1049.17)and 1633.10 ±551.77 ml/(h· kg), respectively.Conclusion A reliable HPLC-MS/MS method for vinorelbine analysis is established and can be applied to the pharmacokinetics study of liposome.The results show that liposome has a higher AUC, Cmax and longer Cl than injection.Meanwhile, liposome has a lower irritability.
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Despite tre mendous research efforts have been devoted to the analysis of nanoparticles (NPs)biohazard,the potential mechanism for nanotoxicity has not yet been syste mati-cal y elucidated.This review intends to point out the confusions about nanotoxicity in the field and tries to look into the mecha-nism from a new perspective.Currently,there are three puzzles:① no relationship between dose and toxicity could be observed in nanotoxicity;②there is a theory for the″size effects″,however, it cannot explain some cases contrary to the doctrine;③ NPs made of different materials with various sizes could have the same toxic effects through sti mulating oxidative stress.In fact, human body is co mposed of various biological molecules,and the biological function of a living syste m is reflected by the inter-actions and conversions of those molecules.NPs,on the other hand,are the invader of human body which has no ability to transport or convert or digest the foreigner.Thus,NPs could cause celldamage due to the physical blockage of micro-circula-tion,celldestruction due to membrane rando m insertion,and celldysfunction due to physical contacting with big biological mole-cules.The physical damages caused by various NPs could be divided into three categories:adhesion lesion,card inlay and puncture.Above al ,by analyzing wide spectrum of NPs varying in co mposition,shape and size,the author draws a conclusion that physical damage is the origin of nanotoxicity.
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Pharmaceutical preparations can directly affect the administration methods and therapeutic effects of drugs , which is a priority for the research and development of the military specialized medicament .Foreign armies started pharma-ceutical formulation research very early , and some of their research concepts and strategies are worth learning from .In this paper , dosage forms were used as the classification factor and several formulations with distinct military characteristics were described in detail .The features of military specialized medicament were analyzed from the perspective of pharmaceutics , based on which future development in the formulation of military specialized medicament was predicted .
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Drug delivery to lungs is becoming an important means of administration of some drugs for lung disease and some protein drugs with systemic effects. This article introduces the inhalation devices and particle characteristics,the two main features of dry powder inhalers (DPI), then reviews the advances on evaluation methods in vitro and in vivo for DPI, such as next generation pharmaceutical impactor (NGI), the imitation between particles and cells using electrodynamic levitation, hydraulic lung and dry powder endotracheal insufflator device, providing references for research and development of DPI evaluation methods.
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Phosphorylation is the most common way of p 53 post-translational modifications .However , gaps still exist in our knowledge regarding the role and mechanism of phosphorylation of p 53 at Ser392 in carcinogenesis and cancer prevention.In the present study, we summarized the effect of phos-p53-Ser392 to wild-type and mutant p53, the regulation by DNA damage agents and protein kinase , and the significance of phosphorylation of p 53-Ser392 in cancer treatment .
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This study was aimed to construct a prokaryotic expressing vector of Hap gene from Nontypeable Haemophilus influenzae, and express and identify the fusion proteins of Hap-His in E. coli. The gene encoding protein Hap was amplified from Nontypeable Haemophilus influenzae ATCC49247 chromosomal DNA by PCR, then it was cloned into prokaryotic expression plasmid pET-32a (+). The recombinant plasmid pET-32a(+)-Hap was transformed into E. coli BL21 and expression was induced by Isopropy-beta-D-thiogalatoside(IPTG). The Hap-His fusion protein expressed so was analyzed by SDS-PAGE and Western-blot. The results showed that the recombinant expressive plasmid pET-32a (+)-Hap was constructed successfully, and the recombinant plasmid expressed Hap-His fusion protein with relative molecule mass 176 000 and mainly existed in inclusion body. This fusion protein could combine with anti-His monoclonal antibody specifically through Western blot analysis. Successful expression of Hap-His fusion protein in prokaryotic cell could lay a basis for further study of immunocompetence of Hap protein and development of NTHi vaccine.
Subject(s)
Bacterial Outer Membrane Proteins , Genetics , Cloning, Molecular , Escherichia coli , Genetics , Metabolism , Genetic Vectors , Genetics , Haemophilus influenzae , Genetics , Recombinant Fusion Proteins , Genetics , Serine Endopeptidases , GeneticsABSTRACT
In order to explore the feasibility and protective efficiency of influenza DNA vaccine, we constructed eukaryotic expressing plasmids encoding HA and HA1 of influenza A virus (A/PR/8/34) and studied their expression in HEK293 cells. HA and HA1 genes were amplified by RT-PCR and cloned into pcDNA3.1(+) to generate pcDNA3.1(+)/HA and pcDNA3.1(+)/HA1, respectively. After verification of the cloning fidelity by restriction endonuclease digestion, PCR, and sequencing, pcDNA3.1(+)/HA and pcDNA3.1(+)/HA1 were transfected into HEK293 cells using PolyFect Transfection Reagent. Immunofluorescence assay was used to detect the transient expressing cells. Fluorescence microscopy revealed strong expression of target gene in HEK293 cells transiently transfected with either pcDNA3.1(+)/HA or pcDNA3.1(+)/HA1. Therefore, the results confirm the successful construction of eukaryotic expressing plasmids capable of driving the eukaryotic expression of influenza virus antigen HA and HA1, which is likely to provide a basis for both further investigation of the mechanism of influenza viral infection and the development of influenza DNA vaccine.
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In order to explore the feasibility and protective efficiency of influenza DNA vaccine, we constructed eukaryotic expressing plasmids encoding HA and HA1 of influenza A virus (A/PR/8/34) and studied their expression in HEK293 cells. HA and HA1 genes were amplified by RT-PCR and cloned into pcDNA3. 1 (+) to generate pcDNA3. 1 (+)/HA and pcDNA3.1 (+)/HA1, respectively. After verification of the cloning fidelity by restriction endonuclease digestion, PCR, and sequencing, pcDNA3.1 (+)/HA and pcDNA3.1 (+)/HA1 were transfected into HEK293 cells using PolyFect Transfection Reagent. Immunofluorescence assay was used to detect the transient expressing cells. Fluorescence microscopy revealed strong expression of target gene in HEK293 cells transiently transfected with either pcDNA3. 1 (+)/HA or pcDNA3. 1 (+)/HA1. Therefore, the results confirm the successful construction of eukaryotic expressing plasmids capable of driving the eukaryotic expression of influenza virus antigen HA and HA1, which is likely to provide a basis for both further investigation of the mechanism of influenza viral infection and the development of influenza DNA vaccine.
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This study was aimed to construct a plasmid expressing siRNA specific for the human telomerase reverse transcriptase (hTERT) gene and to evaluate the ability of small interference RNA(siRNA) for inhibiting telomerase activity in HeLa cells. 64 nucleotides, in which 19 nt were homologous with hTERT gene, were chemically synthesized, annealed and linked into pSUPER to get pSUP-hTE. Then pSUP-hTE was digested with enzyme. We obtained its fragmant concluding promoter and 64nt. So we cloned it into pEGFP-C1 for constructing pEGFP-hTE which contains neo gene and the enhanced green fluorescent protein (EGFP). Recombinant pEGFP-hTE was transfected to HeLa cells. These cells were screened with medium containing G418. When stable colonies appeared, G418-resistant cells were harvested and propagated. At the different cell generations, hTERT mRNA and protein expression, telomerase activity and cell growth activity were analyzed. Compared with control cells, HeLa cells transfected with pEGFP-hTE showed that hTERT mRNA level and hTERT protein expression decreased and telomerase activity reduced by 38%, but the cells growth activity displayed no changes. So pEGFP-hTE could specifically inhibit expression of hTERT and telomerase activity. These results suggested that siRNA targeting hTERT gene might provide a new strategy for cancer biotherapy.
Subject(s)
Humans , Base Sequence , Gene Expression Regulation, Enzymologic , Gene Expression Regulation, Neoplastic , HeLa Cells , Molecular Sequence Data , Plasmids , Genetics , RNA, Small Interfering , Genetics , Pharmacology , Telomerase , Genetics , TransfectionABSTRACT
Angiogenesis is regulated by complex interactions of multiple activators and inhibitors.Vascular endothelial growth factor(VEGF)and Notch signaling pathway are involved in such process.Recent studies have demonstrated that Notch signaling pathway plays a key role in the embryonic development and tumour angiogenesis,and identified the role of Dll4-Notch signaling during vascular development and the mechanism of the vascular defects which result from reduction of Notch signaling,thus Dll4-Notch became regarded as novel and important drug targets for disrupting tumour angiogenesis.This review emphasizes on introduction of the constitution of Notch signaling pathway,the role of Dll4-Notch in angiogenesis and the significance of Dll4-Notch for tumour therapy.
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Good anticoagulant biomaterials need good surface chemical properties, good mechanics performances and particularly good characteristics of biocompatibility, including tissue compatibility and hemocompatibility. In order to understand with greater clearness the anticoagulant biomaterial, we have to characterize them by different methods. In this paper, the approaches to assessing and displaying the characteristics of anticoagulant biomaterial are reviewed in three aspects, namely the surface chemical properties and structure, the mechanics performances the and the biocompatibility of anticoagulant biomaterial.
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Humans , Anticoagulants , Biocompatible Materials , Chemistry , Blood Coagulation , Materials Testing , Prostheses and Implants , Prosthesis Design , Surface PropertiesABSTRACT
Objective To construct a new recombinant immunotoxin expression vector fused with a murine interleukin18(IL18) gene and a truncated pseudomonas exotoxin (PE38) gene, and examine the expression of IL-18-PE38 fusion protein in Escherichia coli (E. coli). Method Murine IL-18 (mIL-18) cDNA was cloned from murine liver tissue through reverse transcription-polymerase chain reaction (RT-PCR). The mIL-18 cDNA was ligased with a PE38 gene carried by PRKL expression vector through T4 DNA ligase and constructed into fusion protein expression plasmid PRKL-IL18-PE38. The recombinant vector was identified by restriction endonucleases digestion, PCR and DNA sequencing. After transformed into E.coli BL21 and induced by IPTG, the expressed product was obtained and the molecular weight and specificity were determined by SDS-PAGE and Western-blotting. Result The new recombinant immunotoxin expression vector was constructed successfully. DNA sequencing revealed that the mIL-18 and PE38 gene were consistent with NCBI Gene Bank. The IL-18-PE38 fusion protein was expressed in E.coli BL21, and Western-blotting analysis indicated that the molecular weight of the expression product is about 56 kDa, and could react with the specific antibody against mIL-18. Conclusion IL-18-PE38 recombinant immunotoxin expression vector will provide the basis for study on the targeted cytotoxic activity to Th1 cells and may have some potential value in the treatment of Th1 cell-mediated autoimmune diseases.