This study is designed to obtain recombinant human acetylcholinesterase (rhAChE) and apply it in screening acetylcholinesterase inhibitors. The rhAChE was overexpressed in HEK293 cells transfected by plasmid of pCMV-AChE with the cationic liposome and rhAChE was found to be secreted into cell culture medium. AChE activity was assayed according to modified Ellman method to obtain kinetic parameters. IC so50 values for donepezil compounds of rhAChE were calculated to determine their activities of inhibition. The results showed that Km value was 151.9 micromol.L-1 donepezil inhibited rhAChE in a mixed competitive-noncompetitive way (Ki= 16.03 nmol.L-1, Ki = 18.36 nmol.L-1) and that most new compounds tested exhibited high activities of inhibition on rhAChE. The study suggests that rhAChE is available to be applied in screening AChE inhibitors in vitro.

Objective To observe the histological effect of acellular dermal matrix(ADM)on insufficiency in guide keratinized tissue regeneration. Methods 6 cases of single anterior tooth implantation in the hospital in 2016 were included in the study. 3 cases were treated with immediate tooth extraction and implantation. Bone substitution materials were grafted in the space between the tooth extraction socket and the implants. The keratin-ized tissue dehiscence was covered by double layers of acellular dermal matrix membrane(Heal-All?,ZH-BIO, China),which was fixed to the adjacent soft tissue by suturing. Another 3 cases were routinely treated with delayed implantation of single anterior tooth. All the cases were subject to harvesting of the cover soft tissues of implants with a punch 4 months later. The new grown soft tissues were histologically observed. Results All cases were sur-vived. The new grown keratinized tissues were observed. Conclusion Acellular dermal matrix can guide the aug-mentation of keratinized tissues.

Objective To investigate the infection status of hepatitis B virus(HBV) and hepatitis C virus(HCV) in healthy adult in Xi′an ,in order to provide references for hepatitis prevention and health education .Methods A total of 1 052 healthy adults from 10 communities in Xi′an were collected by using multistage stratified random sampling method .HBV serum markers and anti‐HCV antibody were detected ,and characteristics of distribution of HBV and HCV infection were analysed .Results A total of 37 adults were observed with positive hepatitis B surface antigen(HBsAg) ,the total positive rate was 3 .52% ,and the positive rate of male and female was 4 .08% and 3 .07% respectively ,no statistically significant difference was found between male and female(P>0 .05) .Apart from male adults aged 30 - < 40 and 40 - < 50 ,there were no statistically significant differences between each age groups in male and female ,and between female and male in the same age groups(P> 0 .05) .A total of 31 adults were observed with HBsAg ,hepatitis B e antibody (HBeAg)and hepatitis B core antibody(HBcAb) positive ,the positive rate was 2 .95% .The positive rate of hepatitis B surface antibody(HBsAb) was 54 .18% .Serological patterns between different gender had no statistically signifi‐cant differences(P>0 .05) .A total of 9 adults(0 .86% ) were observed with positive anti‐HCV antibody ,and the positive rate of male and female was 0 .64% and 1 .02% respectively ,no statistically significant difference was found between male and female(P>0 .05) .Conclusion Healthy adults in Xi′an have relatively low infection rates of HBV and HCV ,while for the control of hepatitis B and hepatitis C ,further strengthening the health education ,improving awareness of prevention and routine monitoring infectious dis‐eases and vaccination may still be necessary .

Objective: To investigate the role of midkine(MK)in the pathogenesis of Henoch-Schonlein purpura(HSP) and Henoch-Schonlein purpura nephritis(HSPN). Methods: In the case group, 35 cases were hospitalized in the pediatric kidney rheumatism immunology ward of Shengjing hospital affiliated to China Medical University from December 2016 to January 2018.Among them, 10 cases were HSP, 25 were HSPN.According to quantitative level of 24-hour urine protein, HSPN group was divided into HSPN(nephrotic level of proteinuria)group of 15 cases and HSPN(non-nephrotic level of proteinuria)group of 10 cases.The control group consisted of 12 healthy cases who underwent physical examination at outpatient department in the same period in the developmental pediatric clinic of our hospital.Blood samples were collected to detect MK.The other clinical datas including renal function, 24-hour urine protein quantitative, immunoglobulin, etc were collected.The serum MK and renal function indexes were compared among groups.The correlation between MK and various clinical indicators was analyzed, and the receiver operating characteristic(ROC) curve was used to analyze the diagnostic significance of MK for HSP and HSPN. Results: MK level of case group was higher than that of healthy control group[(289.34±160.70)pg/ml vs.(100.03±56.75)pg/ml, P<0.05]. Moreover, the difference of MK concentration among the HSPN(nephrotic proteinuria)group, the HSPN(non-nephrotic proteinuria)group and the HSP group was still statistically significant[(449.91±141.91)pg/ml vs.(244.04±89.15)pg/ml vs.(175.94±46.30)pg/ml, P<0.05]. MK was positively correlated with urine microalbumin(r=0.54), IgA(r=0.132), IgE(r=0.304), urine β2 microglobulin(r=0.483), 24-hour urine protein /body weight(r=0.503), and urine transferrin level(r=0.509)in the case group(P<0.05). According to the ROC curve, the area under ROC of MK for predicting the diagnosis of HSP was 0.908(95%CI 0.828-0.988). The optimal value in predicting the diagnosis of HSP was 182.762 pg/ml, with sensitivity and specificity of 81.4% and 91.7%.The area under ROC of MK in predicting HSPN was 0.947(95%CI 0.888-1.000), and the optimal value of predicting HSPN was 218.186 pg/ml, with sensitivity and specificity of 84.0% and 95.5%. Conclusion MK may be involved in the pathogenesis of HSP and HSPN.It can provide the basis for clinical diagnosis of HSP and HSPN, and has significance in evaluating the degree of renal damage of HSPN.

Objective To investigate the serum levels of tumor markers CEA,CA724,PGⅠ,PGⅡ,PGI/PGII and SF in gas-tric cancer.Methods The serum levels of CEA,CA724,PGⅠ,PGⅡ,PGI/PGII and SF were detected in 46 healthy con-trols,45 atrophic gastritis patients and 39 gastric cancer patients.Serum levels of CEA,CA724 were measured by ELC meth-od,PGⅠ,PGⅡ by time resolved fluorescence immunoassay (TRFIA)and SF by immunoturbidimetry(ITM).Results ①Compared to the healthy controls,the statistical contrast of serum levels of CEA,CA724,PGⅠ,PGⅡ and PGI/PGII except SF was significant in gastric cancer patients(P<0.05),only PGⅠ,PGⅡ,SF had significant difference in atrophic gastritis patients (P<0.05).Compared to atrophic gastritis patients,the serum levels of CEA,CA724 were significantly higher,but PGⅠwas lower in gastric cancer patients(P<0.05).②When CEA,CA724,PGⅠ,PGⅡ,PGI/PGII and SF were used to di-agnose gastric cancer individually,the sequence of the area under ROC curve was CEA,SF,CA724,PGI/PGII,PGⅡ and PGⅠ.Only the areas of PGⅠ,PGⅡunder ROC curve had significant statistical difference (P<0.05).③The sensitivity,speci-ficity,PPV and NPV were different when these indexes were used to diagnize gastric cancer individually or incorporatedly. Conclusion The serum levels of tumor markers CEA,CA724,PGⅠ,PGⅡ,PGI/PGII and SF had important reference value for the diagnosis of gastric cancer although the diagnostic value was different individually or incorporatedly;the content of serum PG and the ratio of PGI/PGII were closely related to the gastric mucosa.

Non-small cell lung cancer (NSCLC) accounts for 85% of total cases of lung cancer, which has the highest incidence and mor-tality in China. Most patients with lung cancer present with advanced stage disease at the time of diagnosis. With the limited develop-ment of cytotoxic chemotherapy for NSCLC therapy, median overall survival in patients receiving platinum-based doublet chemothera-py has been less than one year in several trials. To date, anti-angiogenesis agents combined with chemotherapy, small molecule tyro-sine kinase inhibitors (TKI) and immune checkpoint inhibitors were commonly applied in NSCLC instead of purely chemotherapy, which makes a great breakthrough in NSCLC therapy. This review summarizes and discusses the application of anti-angiogenic therapy in ad-vanced NSCLC.

Objective:To study the physical activity level and its influence factors among residents in one suburb of Beijing,so as to provide specific interventions for different people in different circum-stances and to provide reference for health relevant policy-making in the future.Methods:In the study, 7 31 9 subjects aged 1 8 years or above were involved.The self-designed questionnaires based on Health Belief Model (HBM)had acceptable validity and reliability.The physical activity levels were calculated to classify sufficient or insufficient amount by a thousand-step equivalent greater than or equal to 6 or 1 0. Multiple variable Logistic regression was used to explore the influence factors of the physical activity among the residents.Results:The residents’median amount of physical activity in the suburb district of Beijing were 9.1 thousand-step equivalent with quartile of (3.8,20.4).The percentages of the thou-sand-step equivalent greater than or equal to 6 or 1 0 were 63.7% and 47.7%,respectively.The median amounts of physical activity from work or household chores,transportation and recreation physical activi-ties were 4.0,1 .0,0.0 and the components of the total amount of physical activity from those were 61 .7%,1 8.3% and 20.1 %,respectively.There were 8.6% residents whose life did notinvolve moder-ate or vigorous intensity activities.By using factor analysis,five factors were extracted from the scale based on the HBM;These factors together contributed to 63.7% of the sum of the squared loadings.The differences of physical activity levels on education level,age,gender,self-efficacy,cues,subjective and objective barriers were statistically significant (P <0.05).Those who were female,with older age,lower education level,higher self-efficacy,fewer cues,fewer subjective and objective barriers preferred to do more physical activities.Conclusion:The physical activity levels among the residents in the suburb dis-trict of Beijing are moderate and high,and most amount of physical activities from work or household chores.Those who are male and whose ages are from 1 8 to 29 years and whose education levels are of university or above should be focused on intervention.Specific interventions should be developed for dif-ferent people in different situations;More attention should be paid to improve the residents’self-efficacy and reduce the subjective and objective barriers of physical activity,and we also should actively advocate people to have more leisure exercise so as to improve the physical activity level among all residents.

Vav-family proteins are guanosine nucleotide exchange factors(GEFs)and one of RhoGEFs family numbers.Vav proteins can influence cell signaling transduction, cytoskeleton recombination and adherence migration in special cells by RhoA, RhoG and Rac-1 pathway.There are 80 kinds of RhoGEFs in mammalian cell.Vav proteins play an important role in hematological system, nervous system, cardiovascular system and immune system.So the function of vav protein in immune system was reviewed in this paper.

Objective To investigate the correction between the levels of vascular endothelial growth factor (VEGF), serum amyloid A (SAA), hypersensitive C-reactive protein (hs-CRP) and acute cerebral infarction (ACI), and to provide the basis for the diagnosis and treatment of ACI.Methods A total of 76patients with ACI in the hospital from August to October 2017were selected as ACI group.In addition, 32healthy subjects underwent physical examination in the same period in this hospital were selected as negative control group (NC group).The levels of SAA and hs-CRP were detected by nephelometry, while the level of VEGF was measured by enzyme-linked immunosorbent assay (ELISA).The differences of detection indexes between two groups were compared, and the diagnostic value of each index and the combined test were evaluated with the Youden index.Results The levels of SAA, hs-CRP and VEGF in ACI group, were significantly higher than those of NC group (P＜0.01).The levels of VEGF was positively correlated with SAA and hs-CRP (r=0.434and0.631, P=0.000and 0.000).The optimal diagnostic critical points of VEGF, SAA and hs-CRP in the diagnosis of ACI were 161.93pg/mL, 3.81mg/L and 4.63mg/L, and the sensitivities were 93.55％, 65.91％and64.44％, the specificities were 60.00％, 93.75％and 90.32％, respectively.Combined detection with hs-CRP and VEGF was superior to single index detection and other joint detection.The sensitivity, specificity and Youden index of combined detection with hs-CRP and VEGF were 96.67％, 95.65％and 0.92respectively.Conclusion The levels of VEGF, SAA and hs-CRP increase in patients with ACI, and they play important roles in the diagnosis of ACI.VEGF are positively related to SAA and hs-CRP, and there may be an synergistic effect exist.VEGF may be involved in the pathological process of cerebral infarction.The combined detection of hs-CRP and VEGF is of high clinical value in the diagnosis of cerebral infarction.

Objective:To retrospectively analyze the urodynamics quality in Southwest China, and find out the main issues of urodynamics quality in Southwest China and try to find out the improvement ways.Methods:In this study, a two-stage sampling method was used.In the first stage, 10 medical institutions in Southwest China were selected by cluster sampling from March to June, 2020.In the second stage, according to the development of UDS in Southwest China, the sample size estimation formula was adopted, and the loss of follow-up rate in reports extraction was considered, the initial sample size was 350. As the workload of UDS in the 10 medical institutions involved in the study was equivalent, 35 urodynamics traces from each medical institution were selected. The initial samples should also meet the inclusion criteria: ①patients with clear medical history and complete clinical data; ②UDS traces were clear; ③UDS system was water filled system; ④age>18, and 150 urodynamic traces were included in the final study. We evaluated the quality of enrolled urodynamics traces, and the quality evaluation standard according to the guidelines established by the International Continence Society (ICS). The evaluation conducted by two independent urologist with more than 10 years working experience. Artifacts were divided into non-technical artifacts: abnormal abdominal pressure changes, urine volume <150 ml when did the uroflow test, and technical artifacts: non-standard zero setting, fail to record all urodynamics parameters, baseline drift, catheter displacement, misjudgment of detrusor physiological contraction and detrusor overactive in voiding phase, misjudgment between detrusor overactive and bladder low compliance in filling phase.Results:non-technical artifacts: 32 cases were found abnormal abdominal pressure changes (21.3%), 21 cases (14.0%) were found when did the uroflow test the urine volume <150 ml, and technical artifacts: Non-standard zero setting in 28 cases (18.7%), fail to record all urodynamics parameters in 8 cases, baseline drift in 16 cases, catheter displacement in 9 cases and misjudgment of detrusor physiological contraction and detrusor overactive in voiding phase in 12 cases, misjudgment between detrusor overactive and bladder low compliance in filling phase in 24 cases (16.0%).Conclusions:At present, the urodynamics quality in Southwest China need to be improved. The main issues were that the operator didn’t obey the basic operation and quality control process, and the operator did not have enough basic knowledge of urodynamics. It can be improved by strictly carry out the operation standard of UDS, identifying and correcting artifacts in time, and promoting the standardized urodynamic training courses.