Objective To report a case of pulmonary alveolar microlithiasis ( PAM) in Peking Union Medical Col-lege Hospital and to summarize the clinical features and genetic characters .Methods The clinical features , ima-ging results , pathology findings and SLC34 A2 gene mutation was analyzed and reported .Results The patient was a 35 years old male, presenting with cough and sputum for 10 years and worsen with short of breath for 3 weeks. Computed tomography of lung and pathology findings support the diagnose of pulmonary alveolar microlithiasis .And a heterozygous mutation c .A910 T in exon 8 of SLE34 A2 gene was discovered through genetic testing .Conclusions Since to the treatment is non-specific in this rare disease , it's significantly important to recognize this disease through early non-specific clinical features but typical imaging findings .And the finding that c .A910 T is more common in Asia population may provide us a potential target for screening and possible genetic engineering therapy .

BACKGROUND:Diabetic foot ulcers threaten the patients’ health and even survival seriously. It is an international difficult problem and lacks an effective treatment. But gene therapy and stem celltherapy possess special advantages and potential in wound healing. OBJECTIVE:To assess the therapeutic effect of transplantation of bone marrow mesenchymal stem cells transfected by human vascular endothelial growth factor 165 (hVEGF165) gene on foot wound healing in diabetic rats. METHODS:Recombinant adenovirus was established in vitro which expressed hVEGF165 gene and transfected into the third generation of bone marrow mesenchymal stem cells. Total y 120 male Wistar rats were divided into five groups:group A (non-diabetic controls), group B (diabetic controls), group C (Ad-hVEGF165 therapy), group D (stem celltherapy) and group E (transplantation of bone marrow mesenchymal stem cells transfected by Ad-hVEGF165 gene). Rats in the latter four groups were intraperitoneal y injected with streptozotocin to induce diabetic models. In al rats, a 3 mm×7 mm rectangular ful-thickness skin sample was cut from the instep of the hind foot to make a model of foot wound. The rats were subcutaneously injected at equidistant six points 5 mm distal to the wound edge on the dorsum of the foot:50μL PBS per point for group A, 50μL adenovirus suspension (1×1013 pfu/L) per point for group C, 50μL stem cellsuspension (1×1010/L) per point for group D, and 50μL adenovirus suspension+50μL stem cellsuspension per point for group E. RESULTS AND CONCLUSION:After injection, the rate of wound healing, the expression of VEGF and the qualities of capil aries in group E were higher when compared with groups B, C, D (P<0.05), but were lower than those in group A (P<0.05). Transplantation of bone marrow mesenchymal stem cells transfected by hVEGF165 gene can promote foot wound healing, angiogenesis and expression of VEGF in diabetic rats.

Objective To evaluate the analytical performance of Mindray BS‐820 automatic biochemical analysis system used in primary hospitals in Guangzhou area for verifying whether its performance meeting the clinical requirements .Methods Accord‐ing to the EP5‐A2 ,EP6‐A ,EP7‐A2 and EP‐17A files recommended by CLSI and the Pharmaceutical Industry Standard of the Peo‐ple′s Republic of China YY/T0654‐2008 ,the precision ,linear rang ,anti‐interference capability ,sensitivity and carry‐over rate of the Mindray BS‐820 automatic biochemical analysis system were evaluated by adopting 16 routine biochemical items .Results The pre‐cision results of all 16 analyzing items conducted by the Mindray BS‐820 automatic chemical analysis system conformed to the re‐quirements .The results of 15 items showed good linear relation during the testing range (r≥0 .997 9) .In 16 biochemical items ,the anti‐interference capability of TBIL ,TP ,TC ,TG ,LDL ,HDL ,UREA and Ca to bilirubin ,triglyceride and hemoglobin conformed to or were higher than the anti‐interference capability declared by manufacturer ,but among other 8 items ,the anti‐interference capabil‐ity of 3 items was lower than that declared by manufacturer .The limit of blank(LOB) of all 16 analyzing items was less than LOB in the kit instruction .The carry‐over rate of Glu was 0 .02% ,less than 0 .50% .Conclusion This instrument has good precision , sensitivity and low carry‐over rate(0 .02% ) ,the linear range is ideal ,r≥0 .997 9 ,the anti‐interference capability basically satisfies the clinical needs .Therefore this instrument is suitable for the use in the middle‐small scale laboratory department .

The inundation of Cordyceps sinensis counterfeits in the market makes it difficult to identify. In this study, 21 batches of wild C. sinensis from 3 different regions, 30 batches of naturally cultured C. sinensis and 4 kinds of counterfeits extracted by methanol and water were analyzed using NMR technology. 9 characteristic peaks were defined as quantitative criterion after comparison, and NMR fingerprints of C. sinensis were established. According to the result it is highly similar between naturally cultured C. sinensis and wild ones by comparing their NMR fingerprints. However, NMR spectra of four kinds of adulterants showed differences with C. sinensis. The result also showed that NMR fingerprint of C. sinensis are highly characteristic and specific. The NMR characteristic fingerprint of wild C. sinensis was consistent with the naturally cultured C. sinensis, and it indicated that the chemical constituents of wild C. sinensis and naturally cultured C. sinensis are nearly the same.

To compare and evaluate the discriminatory ability and potential value of pulsed field gel electrophoresis (PF-GE) and multiple locus VNTRs analysis (MLVA) on the genotyping of Brucella ,a total of 60 strains of Brucella and three standards (16M ,544A ,1330S) were genotyped simultaneously by PFGE and MLVA .The result indicated that the similarity coefficient among the 63 isolates was from 72 .1-100 .0% by PFGE ,and could distinguish three species of B .melitensis ,B .su-is and B .abortus at the similarity level of 94 .4% .There were 14 clusters and 29 PFGE types identified by PFGE with discrim-inatory index (DI) of 0 .957 5 at the similarity level of 100% ;the similarity coefficient among the 63 isolates was from 16 .9-100 .0% by MLVA ,and could distinguish three species of Brucella at the similarity level of 52 .3% .There were 8 clusters and 47 MLVA types identified by MLVA with discriminatory index (DI) of 0 .985 2 at the similarity level of 100% .It's suggested that PFGE and MLVA could be used to distinguish three species of Brucella in the similarity coefficient of certain ,but could not effectively distinguish the type in the same species .Both of these two methods could be used for Brucella molecular typing , but MLVA is better than PFGE for its relatively higher discriminating ability .

Objective To determine gender differences in baseline characteristics and intervention treatment in relation to prognosis in patients with non-ST segment elevation acute coronary syndrome (NSTEACS). Methods A total of 814 patients (545 men and 269 women) with NSTEACS were randomized to early intervention (coronary angiography ＜ 24 hours after randomization ) or delayed intervention (coronary angiography＞36 hours after randomization). The primary outcome was a composite of death, myocardial infarction, or stroke at 6 months. Results Women were older and more frequently had hypertension, diabtetes, and history of coronary artery disease (CAD) or chronic angina (P＜0.05 for all).Women less were smokers and had elevations in cardiac marker(P ＜ 0. 05 for both). Women who underwent angiography had no significant lesions more often, but the left main stem and/or three-vessel diseases were similar with men. In adjusted multiple logistic regression analysis,the previous myocardial infarction and severe coronary artery disease were independently associated with the risk of primary endpoint in women. On multivariate analysis for men, severe coronary artery disease delayed intervention strategy and at least 3 risk factors for CAD were independently associated with the risk of primary endpoint. Conclusions In NSTEACS patients, different gender had the different prognostic predictor. Severe coronary diseases were as an independent predictor for both male and female patients. An early intervention strategy resulted in a beneficial effect in men which was not seen in women.

Objective: To evaluate the effectiveness of varicella vaccine in varicella outbreaks and to analyze the influencing factors, and to provide a reference for making the targeted prevention and controlling measures. Methods: A total of 3 888 students with no history of varicella were selected from 2 schools with varicella outbreak in Guangdong Province in 2021, a retrospective cohort study was conducted by using questionnaire survey, rate ratio ( RR ) and vaccine effectiveness ( VE ) values were calculated and Logistic regression was uses to analyze the factors influencing the protective effect of varicella. Results: There were 138 confirmed cases of varicella among the participants. There was no significant sex difference in the vaccination rate( χ 2=1.36, P =0.51), but there was significant difference in the vaccinattion rate of different age groups( χ 2=555.82, P <0.01). The overall protective effect of VarV was 66.94%(95% CI =56.17%-77.71%), and the protective effect of 2 doses of vaccine( VE = 90.02% , 95% CI =83.13%-96.90%) was higher than that of 1 dose( VE =49.40%, 95% CI =32.36%-66.44%)( χ 2=24.93, P < 0.01 ). The high fever rates in the vaccinated and unvaccinated groups were 7.69% and 25.81%, with significant difference( χ 2= 6.29 , P <0.05). The rates of moderate and severe skin lesions of vaccinated and unvaccinated groups was 20.00% and 50.00%, respectively, and the difference was statistically significant( χ 2=11.32, P <0.01). The protective effects of varicella vaccine against high fever and moderate to severe rash were 70.19%(95% CI =42.11%-98.27%) and 60.00%(95% CI =38.15%-81.85%). Stratified analysis showed that there were significant differences in different years of vaccination( χ 2=37.87, P <0.05), while there were no significant differences in age of vaccination and vaccine manufacturer ( P >0.05). Conclusion Varicella vaccination can prevent chickenpox infection and reduce the severity of the disease. However, the efficacy of varicella vaccine was affected by vaccination years. It is recommended to improve the vaccination coverage of varicella vaccine to prevent the outbreak of the epidemic.

Purpose/Significance To develop a secure single-cell RNA sequencing(scRNA-seq)classification method,which can enhance data analysis precision and ensure the security of sensitive information,and to promote the application of scRNA-seq technology in various fields.Method/Process The paper proposes a solution based on trusted execution environment(TEE).The training data is encrypted and transmitted to TEE.It is decrypted in a secure and isolated environment,while training the model to obtain the trained model parameters.Automated cell type i-dentification using neural networks(ACTINN)and support vector machine(SVM)are used for cell classification in both TEE and traditional plain-text environments.The results are compared and analyzed.Result/Conclusion The results show that the F1 score of the two classification models in TEE environment reaches 0.904 and 0.879,respectively,which is comparable to the performance in traditional plaintext environment.The secure ex-ecution environment provided by TEE has extremely limited impact on the accuracy and efficiency of the models.This is of great significance for see-king both secure and efficient data processing solutions in scenarios where sensitive or private data needs to be processed.

Objective To understand the status of infection and epidemic trend of Dengue fever and Chikungunya in Guangdong.Methods Retrospective survey and literature review were used to obtain data on the incidence,etiology of Dengue and Chikungunya.Serological survey was conducted to detect the specific-antibodies in healthy individuals for both Dengue virus (DENV) and Chikungunya virus (CHIKV).Results Three epidemics of Dengue fever were observed during 1990-2012,with the annual incidence rates as 9.75/100 000 in 1995,1.76/100 000 in 2002 and 1.25/100 000 in 2006,respectively.The predominant epidemic strains appeared to be DENV-2 and DENV-4 during 1990-1994.Since 1995,DENV-1 had become the predominant transmission strain which lasted for almost 13 years.Co-existence of multiple serotypes of DENV started in 2009.Of the 7 718 sera from healthy population during 2003-2012,180 specimens were detected positive for specific DENV-IgG antibody,ended with a sero-prevalence rate of 2.33％.All 2 132 sera in 2012 were detected negative for CHIKV-IgG antibody.Conclusion The overall exposure level to Dengue was considered to be low in Guangdong province.However,the predominant transmission mode caused by DENV-1 had been gradually changed into the co-existence of multiple serotypes with the endemic signs appeared in some part of the areas.Chikungunya was a newly emerging disease in Guangdong since local people were lack of basic immunity barrier.Surveillance and control programs thus seemed important.

OBJECTIVETo explore the protein expression of heme oxygenase-1 (HO-1) and platelet endothelial cell adhesion molecules-1 (PECAM-1) in human coronary artery endothelial cells induced with Zinc Oxide Nanoparticle (ZnO-NPs).

METHODSMTT assay was used to determine the cell viability of ZnO-NPs. Levels of HO-1 and PECAM-1 protein in culture supernatants were measured using ELISA after human coronary artery endothelial cells were treated with different concentrations (0, 10, 20, 40µg/ml) of ZnO-NPs for 24 h.

RESULTSThe cell viability of human coronary artery endothelial cells in each group was 89.76%, 83.61%, 63.10%, 53.20%, 48.11%, 42.35%, 38.06%, 25.44% respectively when treated with different concentrations of ZnO-NPs (12.5, 25, 50, 70, 80, 90, 100, 200µg/ml). Protein levels of HO-1 (ng/L) in each group were 0.041±0.011, 0.512±0.076, 0.906±0.059, 1.062±0.089 respectively after the stimulation of different concentrations of ZnO-NPs (0, 10, 20, 40µg/ml). Comparisons in each group were statistically significant (P < 0.05). Protein levels of PECAM-1 (µg/L) in each group were 7.966 ± 0.046, 7.993 ± 0.036, 8.629 ± 0.052, 8.811 ± 0.039 respectively after the stimulation of different concentrations of ZnO-NPs (0, 10, 20, 40 µg/ml). Compared with the control group, protein levels of PECAM-1 increased (P < 0.05) when the concentration of ZnO-NPs was 20µg/ml or 40 µg/ml.

CONCLUSIONZnO-NPs stimulation could inhibit the viability of human coronary artery endothelial cells and upregulate the protein expression of HO-1 and PECAM-1.

Blood Platelets ; Cell Survival ; Coronary Vessels ; Endothelial Cells ; drug effects ; Heme Oxygenase-1 ; metabolism ; Humans ; Nanoparticles ; toxicity ; Platelet Endothelial Cell Adhesion Molecule-1 ; metabolism ; Zinc Oxide ; toxicity