Objective To evaluate the application of fluorescence PCR in detecting ureA gene of Helicobacter pylori(HP)in feces.Methods Fluorescence PCR was used to detect ureA gene of HP in feces from 50 patients,including 23 confirmed by gastric biopsy urease test and histological staining.Bacterium culture and serum antibody detection were also performed, and chi-square test was used to compare the sensitivity,specificity,positive predictive value and negative predictive value among three methods.Results The sensitivity,specificity,positive predictive value and negative predictive value of fluorescence PCR were 1.00,0.96,96.O%and 100.0%,while those for HP culture were 0.78,1.00,100.0%and 84.0%,and thee for serum antibody detection Was 0.96,0.74,76.O%and 95.0%.There were significant differences in sensitivity and negative predictive value between PCR and bacterium culture (X2=5.60 and 4.44,P<0.05),and significant differences in specificity and positive predictive value between PCR and serum antibody detection(X2=5.28 and 4.08,P<0.05).Conclusion ureA gene detection in feces by fluorescence PCR is of value for the diagnosis of HP infection.

Objective To study the antiviral effects of Pudilan xiaoyan oral liquid on Hep-2 cell models infected with respiratory syncytial virus (RSV), adenoviruses serotype 3 strains (ADV3) in vitro. Methods The cell cytotoxic and inhibition effect of Pudilan xiaoyan oral liquid on RSV or ADV3 were investigated by MTT assay and the inhibitory assay for cytopathic effect (CPE) in Hep-2 cell cultures to detect its antiviral effects. Results The median toxic concentration (TC50) of Pudilan xiaoyan oral liquid on Hep-2 cells was 776.97 mg/L. The median effective concentration (EC50) of inhibiting RSV and ADV3 were 28.08, 28.10 mg/L,whose therapeutic index (TI) were 27.67 and 27.65 respectively. The safety coefficient of Pudilan xiaoyan oral liquid is higher than that of control, ribavirin. Compared with the virus control group, Pudilan xiaoyan oral liquid can obviously produce actions of a dose-dependent relationship to inhibit CPE in Hep-2 cells infected with RSV or ADV3 virus. Conclusions Pudilan xiaoyan oral liquid significantly improves the protection against RSV and ADV3 virus infection in Hep-2 cells. And the inhibition of CPE induced by viruses infection increased with the elevation of higher drug concentration for its antiviral effect augmented in vitro.

Objective To clone the cheA and cheY genes of Helicobacter pylori for construction of their prokaryotic expression systems, and to establish chemotactic model in vitro of H. pylori for determing chemotaxis-inducing substances and to understand the effects of specific antibody and closantel on inhibiting chemotactic behavior of the microbe. Methods The segments of entire cheA and cheY genes were amplified by PGR and then sequenced after T-A cloning. Prokaryotic expression systems of the genes were subsequent-ly constructed. SDS-PAGE plus Bio-Rad Gel Image Analyzer were used to examine the expression of target recombinant proteins rCheA and rCheY, and Ni-NTA affinity chromatography was performed to extract rCheA and rCheY. Rabbits were immunized with rCheA and rCheY to obtain antisera and IgG in each of the anti-sera was extracted by saturated ammonium sulfate precipitation and DEAE-32 ion exchange chromatography. Immunodiffusion assay was performed to measure the titers of antisera and their IgGs. Chemotactic model in vitro of H. pylori based on hard-agar plus method was established to determine the chemotaxis-inducing effects of eleven candidate substances. Simultaneously, the effects of rCheA-lgG and closantel sodium on blocking the bacterial chemotactic behavior were also observed. Results The segments with expected sizes of cheA and cheY genes were obtained by PCR, and their nucleotide and putative amino acid sequences were 100% idenities to the reports. The constructed prokaryotic systems could efficiently express rCheA and rCheY. The two rabbit antisera and IgG aginst rCheA and rCheY had 1 : 4 and 1 : 2 immunodiffusion titers, respectively. Hydrochloric acid, sulfuric acid and acetic acid were able to induce chemotactic movement of H. pylori. Both rCheA-IgG and closantel sodium with certain concentrations could weaken the chemotactic ability of H. pylori(P<0.05). Conclusion The prokaryotic expression systems of H. pylori cheA and cheY genes were successfully generated in this study. Hydrogen ion (H~+) is the inducer for chemotaxis of H. py-lori. rCheA-IgG, as well as closantel sodium can inhibit H~+-induced chemotaxis of H. pylori.

Objective To determine the effect of cheA gene of Helicobacter pylori in the bacterial chemotaxis in vitro and colonization in vivo. Methods The entire cheA and cheY genes were amplified and cloned from genomic DNA of H. pylori NCTC11637 strain. Subsequently, the prokaryotic expression systems of cheA and cheY genes were generated and the target recombinant proteins rCheA and rCheY were extracted by Ni-NTA affinity chromatography. Rabbits were immunized with either rCheA or rCheY for obtaining antisera, and rCheA-IgG and rCheY-IgG in the antisera were prepared using ammonium sulfate precipitation plus DEAE-52 column chromatography. A suicide plasmid of cheA gene was constructed and then a cheA gene knock-out mutant ( cheA - ) was generated based on homologous recombinant exchange using the suicide plasmid. The cheA- mutant was identified using PCR and sequencing. The phosphorylation levels of CheA and CheY molecules of cheA - and wild-type strain were determined by using rCheA-IgG and rCheY-IgG anchoring the target proteins and protein phosphorylation detection kit. The differences of chemotaxis in vitro and colonization in vivo between cheA- mutant and wild-type strain were compared using chemotactic model and BALB/c infection model of H. pylori. Results The cheA gene knock-out in genome of cheA- mutant was confirmed by the results of PCR and sequencing. After treated with 0. 001-0. 1 mol/L HCI for 10 min, the phosphorylation levels of CheA and CheY molecules of wild-type strain were rapidly descended from ( 59.6 ±11.5) μmol and (55.5 ± 10.2) μmol to ( 10.8 ± 2.6) and (5. 5 ± 1.2) μmol (P ＜ 0.05 ), while the phosphorylation of CheY molecule of cheA - mutant was no markedly changed with a persistent lower level ( P ＞0.05). The diameters [(10-20) ± (2-3) mm] of chemotactic aggregative rings of cheA- mutant were significantly less than those [(16-24) ± (2-3)mm] of wild-type strain (P ＜0.05). The positive isolation rate (90%) of H. pylori in gastric biopsy specimens of mice that infected with wild-type strain was remarkably higher than that (40%) of mice that infected with cheA- mutant (P ＜0.05). The result of fluorescence quantitative was also showed that the numbers (6.3 × 103 ±2.1 × 103 copies/mg) of H. pylori in gastric biopsy specimens of wild-type strain infected mice were significantly larger than those (8.3 × 101 ±3. 1 × 101 copies/mg) in gastric biopsy specimens ofcheA- mutant infected mice (P＜0.05). Conclusion The cheA gene of H. pylori has an important role in the bacterial chemotaxis in vitro and colonization in vivo.

ObjectiveTo optimize the condition of multiple fluorescence quantitative PCR and establish a new assay of four human herpes virus (HHV) detected by AllGlo quadruple fluorescence quantitative PCR.MethodsFour HHV including HSV-1,HSV-2,EBV and CMV were identified by sequence analysing the qualitative PCR production.Furthermore,they were quantitatively detected by AllGlo and TaqMan multiple fluorescence quantitative PCR respectively.ResultsBoth the positive rate and specificity of AllGlo and TaqMan in detecting single HHV achieved 100％.And AllGlo single fluorescence quantitative PCR prevailed over TaqMan's by Ct of 1-3.Four HHV can be simultaneously detected by AllGlo quadruple fluorescence quantitative PCR,comparing to the only two by TaqMan.ConclusionAllGlo fluorescence quantitative PCR assay allows a higher throughput,sensitivity and specificity than TaqMan in detection and thus provides a board prospect.

Objective To study the antiviral and antibacterial effects of the effective site of traditional Chinese medicine(TCM-ES).Methods Chicken embryoes were infected with influenza virus A(FM1 strain) and pre-injected with TCM-ES by means of chicken-embryo inoculation technique,and the antiviral effect of TCM-ES on chicken embryo was assayed by detecting the hemagglutination titers in allantoic fluids.Mice were orally pretreated with various dosages of drugs twice daily for 3 days,then were given drugs continuously for another 4 days following FM1 infection.The protective effects of TCM-ES on mice infected with FM1 were assayed by calculating the weight,index of lung,death-protection rate,and life-prolongation rate,etc.Ribavirin was used as the positive control.In addition,the antibacterial effects of TCM-ES were observed by detecting the minimum inhibitory concentration(MIC) and minimum bactericidal concentration(MBC) by test-tube dilution method.Results In chicken embryo experiments,TCM-ES showed a potential inhibiting effect on influenza virus with the MIC of 10 mg/mL,which was weaker than ribavirin.The results of animal experiment showed that the body-weight(BW) and pulmonary index of infected model group decreased evidently compared with those of the normal group,TCM-ES groups at the dosages of 750 mg/kg and 1500 mg/kg could reverse the decrease of BW and lung index as compared with the infected models,the difference being insignificant as compared with the normal group.Moreover,TCM-ES also increased the death-protection rate and life-prolongation rate of mice in a dose-dependent manner.TCM-ES at dosage of 10 mg/mL(MIC and MBC) had an antibacterial effect on staphylococcus,while had no effect on gram-negative bacilli.Conclusion TCM-ES has obvious antivirus effect on influenza virus FM1 strain,and also has certain antibacterial effect on staphylococcus,which is worth of further development and research.

ObjectiveTo explore the related factors influencing effect of community-based rehabilitation (CBR) on activities of daily living (ADL) in stroke patients in.Methods202 stroke patients were randomly divided into the CBR group (n=103) and control group (n=99). The patients of the CBR group treated with rehabilitation and following-up including risk factors controlled with drug, rehabilitation, health education and mental treatment, those of the control group only treated by following-up. Before and five months after treatment, patients of two groups were assessed with Barthel Index (BI), clinical never function limitation score, cognitive item of Functional Comprehensive Assessment (FCA). Multielement regression analysis was applied, the ADL score of last assessment was taken as dependent variable, group information, location, smoking, sex, age, course of diseases, education, drinking, sleeping, the first scores of FCA and BI were taken as independent variable.ResultsThe improvement of ADL of stroke patients was related with group information, drinking, course of diseases, the first scores of FCA, BI, and etc.ConclusionEarly CBR can significantly improve the ADL of the stroke patients. Cognitive deficit also has influence on ADL.

Objective To establish a rapid,accurate and specific method to detect the common mycobacteria based on multiplex real-time PCR.Methods The dual priming oligonucleotide ( DPO)primers and TaqMan probes labeled with FAM,ROX,HEX or JOE fluoresceins at 5' end and eclipse at 3' end respectively were designed to detect the 16S rRNA of mycobacteria.Both specificity and sensitivity were estimated on multiplex real-time PCR detecting genome DNA from 4 mycobacterial model species.Sixty eight early morning sputum specimens collected from hospitalized patients in the Red Cross Hospital of Hangzhou were detected by multiplex real-time PCR,bacterial culture and smear microscopy simultaneously.The positive rates were analyzed by chi-square.Results Mycobacteria including Mycobacterium tuberculosis and three common non-tuberculosis mycobacteria spp.were identified by multiplex real-time PCR accurately and specifically,with the limited load at 101 cfu/ml.In 68 sputum specimens,31 were positive (positive rate 45.6％ ) by this method,which was significant higher than that by smear microscopy ( positive rate 14.7％,x2 =15.4,P ＜0.05 ).The positive cases were identified as 28 Mycobacterium tuberculosis,1 Mycobacterium avium and 2 Mycobacterium intracellulare in agreement with the culture results.One case,which is detected by culture,but not by PCR,was identified as Mycobacterium chelonae by sequencing.Conclusion The multiplex real-time PCR characterizing as sensitive,specific and time-saving for Mycobacterium tuberculosis and common non-tuberculosis mycobacteria could be chosen as the rapid laboratory test of mycobacterial infection.

BACKGROUND: Genetically engineered cells have been used in the replacement therapy and gene therapy. However, how to select proper donor cells, target cells, and corresponding viral vectors is the most difficult in the therapy.OBJECTIVE: To compare the transduction efficiency of recombinant adenovirus Ad5 and AdSF35, adeno-associated virus rAAV1/2 and rAAV2, and lentivirus LV in bone marrow mesenchymal stem cells (BMSCs) and exogenous gene expression level so as to select the vectors, which can efficiently transduce BMSCs.DESIGN, TIME AND SETTING: Gene engineering controlled observation, performed in the Central Laboratory, Shanghai First People's Hospital between October 2006 and March 2007.MATERIALS: Ten Sprague Dawley rats of clean grade were used to prepare BMSCs. All recombinant viral vectors carded enhanced green fluorescent protein (EGFP) report gene. Ad5 was prepared by the Central Laboratory, Shanghai First People's Hospital. Ad5F35 was gifted by professor Qian Qi-jun from the Second Military Medical University of Chinese PLA. rAAV2 and rAAVI/2 were the products of Benyuan Zhengyang Gene Technique Co.,Ltd. LV was gifted by professor Cuo Li-be from Shanghai Institute of Biochemistry and Cytobiology, Chinese Academy of Sciences.METHODS: Rat BMSCs were in vitro isolated and cultured by density gradient centrifugation. BMSCs of passage 4 were inoculated into 24-well plate at lxlO5/well. One day later, ceils adhered to the wall and allocated to 5 groups. Ad5-EGFP [10, 100,1 000 multiplicity of infection (MOI)], Ad5F35-EGFP (10,10, 1 000 MOI), rAAVI/2-EGFP (1×104,1x10× vg), rAAV2-EGFP(1×104, 1x105vg), and LV-EGFP (30 TU) were respectively added into the 5 groups. BMSCs were transduced for 2 days with Ad virus and separately for 6 days with rAAV and LV virus.MAIN OUTCOME MEASURES: EGFP-positive expression and fluorescence intensity.RESULTS: After twenty-four hours of Ad5-EGFP transduction, EGFP-positive cells were visible under the microscope. With virus dose increasing, EGFP-positive cells increased and fluorescence intensity strengthened. Twelve days later, EGFP-positive cells gradually reduced and fluorescence intensity weakened. For Ad5F35-EGFP, its transduction was basically similar to Ad5-EGFP, but EGFP-positive cell number and fluorescence intensity were increased. After 6 days of rAAV1/2-EGFP or rAAV2-EGFP transduction, EGFP-posidve cell number and fluorescence intensity were decreased. For LV-EGFP transduction, a small amount of EGFP-positive cells could be visible on the second day, and then EGFP-positive ceils and fluorescence intensity were gradually increased until the sixth day.CONCLUSION: Ad5, Ad5F35 and LV could effectively transduce BMSCs cultured in vitro and express exogenous gene.Furthermore, transduction efficiency was correlated with virus dose in dose-dependent manner, rAAVI/2 and rAAV2 had poor/in vitro transduction efficiency.

Objective: To investigate the effect of cobalt chloride (CoCl2) on transgene expression and viral particle titers in tumor cells infected by conditionally replicating adenovirus expression vector with hypoxia response elements(HRE)-regulated E1AE1B expression (Ad-5HRE-E1AE1B-RFP) and non-HRE regulated replication-deficient adenovirus expression vector (Ad-EGFP, Ad-Luc) in vitro and in vivo. Methods: Ad-5HRE-E1AE1B-RFP had five duplicated HRE and mini CMV acted as a promoter to drive E1AE1B expression and constitutive expression of RFP as reporter. The hypoxia model was optimized by exposing tumor cells to different concentrations of CoCl2. The hypoxia-inducible factor 1 alpha (HIF-1α) protein expression was determined by Western blotting. Under the optimized hypoxia model, the positive expression of exogenous gene and virus replication of Ad-5HRE-E1AE1B-RFP or Ad-EGFP-infected tumor cells were examined by conversed microscopic observation, FACS analysis and plaques formation test. Furthermore, transgene expression induced by combined application of hypoxia-inducible replicative adenovirus and replication deficient adenovirus (Ad-Luc) was also evaluated by examining the lucifererse activity in xenografted tumor models in nude mice by micro PET. Results: Western blotting results showed that CoCl2 at 0.4 and 0.08 μg/mL could stabilize and acumulate HIF-1α protein in gastric cancer SGC7901 cells, which could better mimic hypoxia condition. The microscopic observation and FACS analysis showed that CoCl2 at 0.4 μg/mL could remarkably increase the transduction efficacy of Ad-5HRE-E1AE1B-RFP, which was verified by significant increase in the percentage of positive expression of exogenous gene RFP and fluorescence intensity. But plaques formation test showed that Ad-5HRE-E1AE1B-RFP had no replication. CoCl2 0.4 μg/mL augmented the tranduction efficacy and expression levels of non-HRE regulated replication deficient adenovirus Ad-EGFP and Ad-Luc. Combined intratumoral injection of Ad-5HRE-E1AE1B-RFP and Ad-Luc significantly increased the expression of Ad-Luc in nude mice.Conclusion: CoCl2 markedly enhances transgene expression of recombinant adenovirus. However, the underlying mechanism is not only related to the CoCl2-induced hypoxia, but also probably related to regulation of gene transcription.