Ku70 Functions as an RNA Helicase to Regulate miR-124 Maturation and Neuronal Cell Differentiation / 生物化学与生物物理进展

ObjectiveHuman Ku70 protein mainly involves the non-homologous end joining (NHEJ) repair of double-stranded DNA breaks (DSB) through its DNA-binding properties, and it is recently reported having an RNA-binding ability. This paper is to explore whether Ku70 has RNA helicase activity and affects miRNA maturation. MethodsRNAs bound to Ku protein were analyzed by RNA immunoprecipitation sequencing (RIP-seq) and bioinfomatic anaylsis. The expression relationship between Ku protein and miRNAs was verified by Western blot (WB) and quantitative reverse transcriptase-polymerase chain reaction (qRT-PCR) assays. Binding ability of Ku protein to the RNAs was tested by biolayer interferometry (BLI) assay. RNA helicase activity of Ku protein was identified with EMSA assay. The effect of Ku70 regulated miR-124 on neuronal differentiation was performed by morphology analysis, WB and immunofluorescence assays with or without Zika virus (ZIKV) infection. ResultsWe revealed that the Ku70 protein had RNA helicase activity and affected miRNA maturation. Deficiency of Ku70 led to the up-regulation of a large number of mature miRNAs, especially neuronal specific miRNAs like miR-124. The knockdown of Ku70 promoted neuronal differentiation in human neural progenitor cells (hNPCs) and SH-SY5Y cells by boosting miR-124 maturation. Importantly, ZIKV infection reduced the expression of Ku70 whereas increased expression of miR-124 in hNPCs, and led to morphologically neuronal differentiation. ConclusionOur study revealed a novel function of Ku70 as an RNA helicase and regulating miRNA maturation. The reduced expression of Ku70 with ZIKV infection increased the expression of miR-124 and led to the premature differentiation of embryonic neural progenitor cells, which might be one of the causes of microcephaly.

Antimicrobial resistance and plasmid-mediated colistin resistance mechanism of diarrheagenic Escherichia coli recovered from foods in parts of China in 2020 / 中华预防医学杂志

Objective: To investigate the antimicrobial resistance of food-borne diarrheagenic Escherichia coli (DEC) and the prevalence of mcr genes that mediates mobile colistin resistance in parts of China, 2020. Methods: For 91 DEC isolates recovered from food sources collected from Fujian province, Hebei province, Inner Mongolia Autonomous Region and Shanghai city in 2020, Vitek2 Compact biochemical identification and antimicrobial susceptibility testing platform was used for the detection of antimicrobial susceptibility testing (AST) against to 18 kinds of antimicrobial compounds belonging to 9 categories, and multi-polymerase chain reaction (mPCR) was used to detect the mcr-1-mcr-9 genes, then a further AST, whole genome sequencing (WGS) and bioinformatics analysis were platformed for these DEC isolates which were PCR positive for mcr genes. Results: Seventy in 91 isolates showed different antimicrobial resistance levels to the drugs tested with a resistance rate of 76.92%. The isolates showed the highest antimicrobial resistance rates to ampicillin (69.23%, 63/91) and trimethoprim-sulfamethoxazole (59.34%, 54/91), respectively. The multiple drug-resistant rate was 47.25% (43/91). Two mcr-1 gene and ESBL (extended-spectrum beta-lactamase) positive EAEC (enteroaggregative Escherichia coli) strains were detected. One of them was identified as serotype of O11:H6, which showed a resistance profile to 25 tested drugs referring to 10 classes, and 38 drug resistance genes were predicted by genome analysis. The other one was O16:H48 serotype, which was resistant to 21 tested drugs belonging to 7 classes and carried a new variant of mcr-1 gene (mcr-1.35). Conclusion: An overall high-level antimicrobial resistance was found among foodborne DEC isolates recovered from parts of China in 2020, and so was the MDR (multi-drug resistance) condition. MDR strains carrying multiple resistance genes such as mcr-1 gene were detected, and a new variant of mcr-1 gene was also found. It is necessary to continue with a dynamic monitoring on DEC contamination and an ongoing research into antimicrobial resistance mechanisms.

Protective mechanism of salvianolic acid B on blood vessels / 中国中药杂志

Salvianolic acid B(Sal B) is the main water-soluble component of Salvia miltiorrhiza Bunge. Studies have found that Sal B has a good protective effect on blood vessels. Sal B can protect endothelial cells by anti-oxidative stress, inducing autophagy, inhibiting endoplasmic reticulum stress(ERS), inhibiting endothelial inflammation and adhesion molecule expression, inhibiting endothelial cell permeability, anti-thrombosis, and other ways. In addition, Sal B can alleviate endothelial cell damage caused by high glucose(HG). For vascular smooth muscle cell(VSMC), Sal B can reduce the synthesis and secretion of inflammatory factors by inhibiting cyclooxygenase. It can also play a vasodilatory role by inhibiting Ca~(2+) influx. In addition, Sal B can inhibit VSMC proliferation and migration, thereby alleviating vascular stenosis. Sal B also inhibits lipid deposition in the subendothelium, inhibits macrophage conversion to foam cells, and reduces macrophage apoptosis, thereby reducing the volume of subendothelial lipid plaques. For some atherosclerosis(AS) complications, such as peripheral artery disease(PAD), Sal B can promote angiogenesis, thereby improving ischemia. It should be pointed out that the conclusions obtained from different experiments are not completely consistent, which needs further research. In addition, previous pharmacokinetics showed that Sal B was poorly absorbed by oral administration, and it was unstable in the stomach, with a large first-pass effect in the liver. Sal B had fast distribution and metabolism in vivo and short drug action time. These affect the bioavailability and biological effects of Sal B, and the development of clinically valuable Sal B non-injectable delivery systems remains a great challenge.

Genetically predicted insomnia causally increases the risk of erectile dysfunction / 亚洲男科学杂志(英文版)

Sleep has attracted extensive attention due to its significance in health. However, its association with erectile dysfunction (ED) is insufficiently investigated. To investigate the potential causal links between sleep traits (insomnia, sleep duration, and chronotype) and ED, this study was performed. The single-nucleotide polymorphisms (SNPs) associated with insomnia, sleep duration, and chronotype were retrieved from previous genome-wide association studies (GWAS). A conventional two-sample Mendelian randomization (MR) was used to estimate the causal links between sleep traits and ED. The summary statistics of ED were from individuals of European ancestry (6175 cases vs 217 630 controls). As shown by the random effect inverse-variance-weighting (IVW) estimator, genetically predicted insomnia was causally associated with a 1.15-fold risk of ED (95% confidence interval: 1.07-1.23, P < 0.001). Sleep duration and morningness were not causally associated with ED, as indicated by the IVW (all P > 0.05). These findings were consistent with the results of sensitivity analyses. Based on genetic data, this study provides causal evidence that genetically predicted insomnia increases the risk of ED, whereas sleep duration and chronotype do not.

The association between heavy metal exposure and erectile dysfunction in the United States / 亚洲男科学杂志(英文版)

Literature regarding the impacts of heavy metal exposure on erectile dysfunction (ED) is scarce. We aimed to evaluate the correlation between 10 urinary metals and ED in a large, nationally representative adult male sample. The dataset was extracted from the National Health and Nutrition Examination Survey (NHANES) during the period of 2001-2002 and 2003-2004. Weighted proportions and multivariable logistic regression analysis adjusted for confounding variables were utilized to determine the relationship between metal exposure and ED. Weighted quantile sum (WQS) regression was utilized to evaluate the impact of a mixture of urinary metals on ED. A total of 1328 participants were included in our study. In multivariable logistic regression analysis, cobalt (Co) and antimony (Sb) were positively associated with ED (odds ratio [OR]: 1.36, 95% confidence interval [CI]: 1.10-1.73, P = 0.020; and OR: 1.41, 95% CI: 1.12-1.77, P = 0.018, respectively) after full adjustment. Men in tertile 4 for Co (OR: 1.49, 95% CI: 1.02-2.41, P for trend = 0.012) and Sb (OR: 1.53, 95% CI: 1.08-2.40, P for trend = 0.041) had significantly higher odds of ED than those in tertile 1. Furthermore, the WQS index was significantly linked with increased odds of ED after full adjustment (OR: 1.31, 95% CI: 1.04-1.72, P < 0.05). Our study expanded on previous literature indicating the possible role of heavy metal exposure in the etiology of ED. The evaluation of heavy metal exposure should be included in the risk assessment of ED.

Antimicrobial resistance and genomic characterization of Campylobacter isolates recovered from retailed poultry meat samples in 20 provinces of China in 2020 / 中华预防医学杂志

Objective: To understand the antimicrobial resistance and genome characteristics of Campylobacter isolates recovered from retailed poultry meat samples in 20 provinces in China in 2020. Methods: In 2020, 265 Campylobacter strains including 244 Campylobacter jejuni and 21 Campylobacter coli collected from retailed poultry meat samples in China were tested for antimicrobial resistance to 9 antimicrobial compounds by using the agar dilution method. Forty-two selected isolates were sent for whole genome sequencing and 38 high-quality genomes were analyzed for their antimicrobial resistance genes, virulence genes, sequence types and genetic diversity. Results: The resistance rates of Campylobacter isolates from poultry meats to tetracycline, nalidixic acid and ciprofloxacin were the highest (84%-100%), with 53.2% of the isolates showing multidrug resistance in this study. The resistance rates of C. coli to erythromycin, azithromycin, telithromycin, gentamicin and clindamycin were significantly higher than those of C. jejuni (P<0.05). The resistance genes conferring resistance to β-lactams (100%, 38/38), quinolones (94.7%, 36/38), tetracycline (81.6%, 31/38) and aminoglycosides (50%, 19/38) were the most frequently detected among 38 Campylobacter genomes. C. jejuni carried more virulence genes than C. coli. In total, 19 and 17 sequence types (ST) were obtained from 20 sequenced C. jejuni and 18 C. coli isolates, respectively, including 5 novel STs. The isolates showed a high genetic diversity based on their sequence types. Conclusion: The phenomenon of antimicrobial resistance in Campylobacter from poultry meat sources in China is relatively serious, and resistance and virulence genes are widely distributed in Campylobacter. There is genetic diversity in Campylobacter.

Antimicrobial resistance and genomic characterization of Campylobacter isolates recovered from retailed poultry meat samples in 20 provinces of China in 2020 / 中华预防医学杂志

Objective: To understand the antimicrobial resistance and genome characteristics of Campylobacter isolates recovered from retailed poultry meat samples in 20 provinces in China in 2020. Methods: In 2020, 265 Campylobacter strains including 244 Campylobacter jejuni and 21 Campylobacter coli collected from retailed poultry meat samples in China were tested for antimicrobial resistance to 9 antimicrobial compounds by using the agar dilution method. Forty-two selected isolates were sent for whole genome sequencing and 38 high-quality genomes were analyzed for their antimicrobial resistance genes, virulence genes, sequence types and genetic diversity. Results: The resistance rates of Campylobacter isolates from poultry meats to tetracycline, nalidixic acid and ciprofloxacin were the highest (84%-100%), with 53.2% of the isolates showing multidrug resistance in this study. The resistance rates of C. coli to erythromycin, azithromycin, telithromycin, gentamicin and clindamycin were significantly higher than those of C. jejuni (P<0.05). The resistance genes conferring resistance to β-lactams (100%, 38/38), quinolones (94.7%, 36/38), tetracycline (81.6%, 31/38) and aminoglycosides (50%, 19/38) were the most frequently detected among 38 Campylobacter genomes. C. jejuni carried more virulence genes than C. coli. In total, 19 and 17 sequence types (ST) were obtained from 20 sequenced C. jejuni and 18 C. coli isolates, respectively, including 5 novel STs. The isolates showed a high genetic diversity based on their sequence types. Conclusion: The phenomenon of antimicrobial resistance in Campylobacter from poultry meat sources in China is relatively serious, and resistance and virulence genes are widely distributed in Campylobacter. There is genetic diversity in Campylobacter.

Application of virtual training system for composite resin filling technique in undergraduate stomatology teaching / 中华医学教育探索杂志

Objective:To assess the influence of a virtual simulation-based training system for composite resin filling on the knowledge acquisition, skill development, and overall learning experience of undergraduate stomatology students.Methods:Forty-one undergraduate students of grade 2019 majoring in stomatology were divided into two groups for preclinical training before their internships: the experimental group used a virtual training system for composite resin filling, while the control group watched instructional videos of the procedure. The two groups were compared for their first performance in composite resin filling during the internships and teaching feedback. The t-test and chi-square test were conducted for data analysis using SPSS 20.0. Results:After repeatedly using the virtual training system for composite resin filling, the students in the experimental group were able to master the key operational points of the procedure, all achieving high scores (an average of 91.77 points) with an average time of 10.39 minutes. During the internship phase, the experimental group and control group showed significant differences in the accuracy rates of instrument selection (85.71% vs. 40.00%), adhesive applying (76.19% vs. 45.00%), and layered filling (100.00% vs. 75.00%; all P<0.05). All the students unanimously recognized the value of the virtual simulation system and expressed their willingness to use it for preclinical training before internships. Nineteen students (90.48%) were satisfied with the learning experience with the virtual simulation training system. Conclusions:The virtual simulation training system for composite resin filling can improve students' understanding and proficiency levels of the technique before clinical internships, facilitating a smoother transition to the internship phase.

Polysaccharide of Balanophora involucrata Hook. f. attenuates cell ferroptosis in rats with experimental liver injury through SLC7A11/GPX4 pathway / 药学学报

Polysaccharide of Balanophora involucrata Hook. f. (BPS), the major component of Balanophora involucrata Hook. f., was confirmed the protective effect on liver injury in our previous study. This research aimed to investigate the protective mechanism of BPS on experimental liver injury by attenuating cell ferroptosis through modulating solute carrier family 7 member 11/glutathione peroxidase 4 (SLC7A11/GPX4) pathway. The animal experiment was approved by the Experimental Animal Ethical Committee of Hubei Minzu University and all rats had received human care in compliance with the institutional animal care guidelines. Rats were given intraperitoneal injection of (D-galactosamine, D-GalN) solution (800 mg·kg-1) one time to establish the acute liver injury model. The results showed aspartate amino transferase (AST), alanine aminotransferase (ALT) and 4-hydroxynonenal (4-HNE) levels in serum were decreased, and the contents of reactive oxygen species (ROS), Fe2+, malondialdehyde (MDA) and lipid peroxide (LPO) in liver tissues also decreased and glutathione (GSH) level increased after BPS administration with 200 mg·kg-1. Besides, BPS reduced iron deposition and increased the expression of SLC7A11 and GPX4 proteins in liver tissue. In conclusion, BPS ameliorated experimental liver injury by alleviating cell ferroptosis through SLC7A11/GPX4 pathway. The present study pointed to the possibility of utilizing BPS for protection against liver injury in clinic.

Research progress and prospects for the use of plant metabolomics in quality evaluation of traditional Chinese medicinal materials / 药学学报

The quality of traditional Chinese medicine has a direct impact on the effectiveness and safety of its use, and is the premise necessary to ensure the healthy development of the traditional Chinese medicine industry. Comprehensive and accurate control and evaluation of the quality of medicinal materials is of great significance to the traditional Chinese medicine industry, but the complexity and dynamics of the chemical composition of medicinal materials makes their quality evaluation a challenge. Plant metabolomics provides an integrated and comprehensive analysis that is consistent with the holistic approach of traditional Chinese medicine. Chemical information therein promotes the establishment of a traceable system and provides new ideas and methods for the quality evaluation of medicinal materials. Plant metabolomics in the quality evaluation of medicinal materials is gradually increasing, and the core is the screening and identification of differential metabolites or specific marker compounds by means of stoichiometry. This study focused on the main factors that affect the quality of medicinal materials, such as origin, environmental adversity, varieties, harvest time, commercial specification and TCM processing. We describe the research progress in plant metabolomics combined with chemometrics analysis for the quality control and evaluation of medicinal materials, summarize existing problems, identify trends, and propose future research directions. Metabolomics plays an increasingly important role in the quality evaluation of medicinal materials, but the absolute qualitative and quantitative information of metabolomics needs to be further developed, and a single 'omics' technique is not sufficient for an in-depth analysis of medicinal value. In the future, standardization of plant metabolomics methods and a more complete database should be actively promoted, and plant metabolomics should be integrated into quality marker exploration. Plant metabolomics will need to be integrated with other 'omics' methods to improve the quality and evaluation system of medicinal materials.

Analysis of contaminated microorganisms in commercial honey / 上海预防医学

Objective To investigate the microbial contamination in 54 batches of commercial honey. Methods Aerobic plate colony counts for bacteria and colonies of mould and osmophilic yeasts in honey were determined according to the National Food Safety Standard. The bacteria and fungi in unqualified samples were further identified and analyzed by morphology， MALDI-TOF-MS and large subunit （LSU） rRNA gene sequence. Results Three unqualified batches were found. One batch had aerobic plate colony counts exceeding the standard， with a variety of bacteria including Bacillus sp.， Paenibacillus sp. and Brevibacillus sp. Two batches had mould counts exceeding the standard. Aspergillus sp was detected in both samples （from the same manufacturer）， and the DNA sequence homology was very high， suggesting the mould might come from the same pollution source. Conclusion There are many kinds of microbial contamination in honey. Manufacturers should strengthen the microbe control in monitoring process to avoid the repeated microbial contamination.

Transcriptomic analysis of the ΔPaLoc mutant of Clostridioides difficile and verification of its toxicity / 中华预防医学杂志

Objective: Comparative analyses of wild-type Clostridioides difficile 630 (Cd630) strain and pathogenicity locus (PaLoc) knockout mutant (ΔPaLoc) by using RNA-seq technology. Analysis of differential expression of Cd630 wild-type strain and ΔPaLoc mutant strain and measurement of its cellular virulence changes. Lay the foundation for the construction of an toxin-attenuated vaccine strain against Clostridioides difficile. Methods: Analysis of Cd630 and ΔPaLoc mutant strains using high-throughput sequencing (RNA-seq). Clustering differentially expressed genes and screening differentially expressed genes by DESeq software. Further analysis of differential genes using Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment. Finally, cytotoxicity assays of ΔPaLoc and Cd630 strains were performed in the African monkey kidney epithelial cell (Vero) and the human colonic cell (Caco-2) lines. Results: The transcriptome data showed that the ΔPaLoc mutant toxin genes tcdA and tcdB were not transcribed. Compared to the wild-type strain, CD630_36010, CD630_020910,CD630_02080 and cel genes upregulated 17.92,11.40,8.93 and 7.55 fold, respectively. Whereas the hom2 (high serine dehydrogenase), the CD630_15810 (spore-forming protein), CD630_23230 (zinc-binding dehydrogenase) and CD630_23240 (galactitol 1-phosphate 5-dehydrogenase) genes were down-regulated by 0.06, 0.075, 0.133 and 0.183 fold, respectively. The GO and KEGG enrichment analyses showed that the differentially transcribed genes in ΔPaLoc were enriched in the density-sensing system, ABC transport system, two-component system, phosphotransferase (PTS) system, and sugar metabolism pathway, as well as vancomycin resistance-related pathways. Cytotoxicity assays showed that the ΔPaLoc mutant strain lost its virulence to Vero and Caco-2 cells compared to the wild-type Cd630 strain. Conclusion: Transcriptional sequencing analysis of the Cd630 and ΔPaLoc mutant strains showed that the toxin genes were not transcribed. Those other differential genes could provide a reference for further studies on the physiological and biochemical properties of the ΔPaLoc mutant strain. Cytotoxicity assays confirmed that the ΔPaLoc mutant lost virulence to Vero and Caco-2 cells, thus laying the foundation for constructing an toxin-attenuated vaccine strain against C. difficile.

Multi-enzyme isothermal rapid amplification assay for the detection of Escherichia coli O157∶H7 / 上海预防医学

ObjectiveA rapid enrichment and detection method for Escherichia coli O157∶H7 was developed by using multienzyme isothermal rapid amplification （MIRA） fluorescence method combined with metal organic frameworks immunomagnetic beads. MethodsUsing rfbE gene as the target， the primers， probes and reaction system were screened， and the specificity， sensitivity and practical application of this method were investigated. ResultsThe detection limit of Escherichia coli O157∶H7 was 1.18×105 CFU‧mL-1， and the detection limit of DNA concentration was 9 pg‧μL-1. The detection process was completed in 20 minutes. The test results of 47 strains （24 target strains and 23 non-target strains） were consistent with real-time PCR （RT-PCR）. ConclusionA method based on metal-organic framework immunomagnetic beads enrichment combined with MIRA assay is developed in this study. The method is simple， rapid and suitable for rapid enrichment and detection of Escherichia coli O157∶H7 in food.

Sample preparation and analysis of proficiency test containing Staphylococcus aureus with drug matrix / 上海预防医学

Objective To prepare samples of proficiency testing （PT） containing live Staphylococcus aureus with drug matrix in microbial PT program of drug testing， and to evaluate the laboratory capability of microbiology tests in China. Methods Two kinds of PT samples containing living bacteria with drug matrix were prepared and evaluated. The results of laboratories participated in PT program and their response to the survey questionnaire were collected and analyzed. Results The homogeneity and stability of the PT samples complied with the requirements of CNAS-CL03： 2010. Samples could be stored stably for at least 6 months at -20 ℃. Among 63 laboratories participating in PT program， 53 laboratories （84.1%） achieved satisfactory results. The satisfaction rate was 94.1% （16/17） in 17 government laboratories （27.0% of total 63 laboratories）， 81.4% （35/43） in 43 pharmaceutical quality control laboratories （68.3% of total 63 laboratories）， and 66.7% （2/3） in 3 non-government laboratories （4.8% of total 63 laboratories）， respectively. Conclusion The government laboratories performed better than pharmaceutical quality control laboratories in microbiology tests of drug， and the testing abilities of some pharmaceutical laboratories needs to be improved. The preparation and application of microbial samples in drug matrix could provide evaluation tools for drug testing laboratories in microbiology.

Sample preparation and analysis of proficiency test containing Staphylococcus aureus with drug matrix / 上海预防医学

Objective To prepare samples of proficiency testing （PT） containing live Staphylococcus aureus with drug matrix in microbial PT program of drug testing， and to evaluate the laboratory capability of microbiology tests in China. Methods Two kinds of PT samples containing living bacteria with drug matrix were prepared and evaluated. The results of laboratories participated in PT program and their response to the survey questionnaire were collected and analyzed. Results The homogeneity and stability of the PT samples complied with the requirements of CNAS-CL03： 2010. Samples could be stored stably for at least 6 months at -20 ℃. Among 63 laboratories participating in PT program， 53 laboratories （84.1%） achieved satisfactory results. The satisfaction rate was 94.1% （16/17） in 17 government laboratories （27.0% of total 63 laboratories）， 81.4% （35/43） in 43 pharmaceutical quality control laboratories （68.3% of total 63 laboratories）， and 66.7% （2/3） in 3 non-government laboratories （4.8% of total 63 laboratories）， respectively. Conclusion The government laboratories performed better than pharmaceutical quality control laboratories in microbiology tests of drug， and the testing abilities of some pharmaceutical laboratories needs to be improved. The preparation and application of microbial samples in drug matrix could provide evaluation tools for drug testing laboratories in microbiology.

Anterior and posterior auricular approach for ear cartilage harvesting rhinoplasty: a comparative study / 中华医学美学美容杂志

Objective:To compare the pros and cons of harvesting ear cartilage through anterior and posterior auricular approaches during rhinoplasty.Methods:From January 2017 to December 2018, 63 patients with otochondral rhinoplasty in our hospital were enrolled in this study, 60 were female and 3 were male; the average age was 31.6 years (range, 18 to 43) . They were randomly divided into anterior auricular approach group with 32 cases (64 sides) and posterior auricular approach group with 31 cases (62 sides). Surgical duration, complications and postoperative scar of the two methods were analyzed.Results:The average time for harvesting the ear cartilage through posterior auricular approach and anterior auricular approach was (20.8±1.7) min and (12.6±1.1) min, respectively ( P<0.01). The overall complication rate was 15.6% for posterior auricular approach group and 4.8% for anterior auricular approach group. The wound healed well in both groups, and there was no significant difference in postoperative scar between the two groups during an average 13 months follow-up period. Conclusions:While both the anterior and the posterior auricular approaches present with similar inconspicuous scarring, the use of anterior auricular approach alone to harvest ear cartilage during rhinoplasty provides both the surgeons and the patients with easier access, shorter surgical duration, and fewer complications. Hence, we believe that the anterior auricular approach possesses greater advantages than the posterior auricular approach.

Classification system and surgical design of developmental breast asymmetry / 中华医学美学美容杂志

Objective:To explore the classification and treatment strategies of developmental breast asymmetry (DBA).Methods:A retrospective study was conducted in adult female patients with developmental breast asymmetry deformity who underwent surgery between January 2005 to June 2019 in the Plastic Surgery Department of Peking Union Medical College Hospital. According to different clinical manifestations, DBA was divided into three types which adopted to different surgical strategies. Postoperative complications and patient satisfaction were evaluated.Results:A total of 203 patients were included in the study; 42.36% (86 cases) were type Ⅰ, 31.03% (63 cases) were type Ⅱ and 26.60% (54 cases) were type Ⅲ. The number of follow-up patients accounted for 79.3% (161/203). The mean follow-up time was 9 months. There were one case of poor healing of the axillary incision in latissimus dorsi muscle flap, two cases of seroma, five cases of Baker grade Ⅰ capsule contracture, two cases of Baker grade Ⅱ capsule contracture and one cases of small nodules in autologous fat breast augmentation. With regard to patient satisfaction, 80.1% (129 cases) felt satisfied with the aesthetic results, 15% (24 cases) felt good, 3.7%. (6 cases) felt average and 1.2% (2 cases) felt unsatisfied.Conclusions:This study shows that the clinical manifestations of DBA are varied, and our classification method is an effective and useful tool to guide the surgical treatment. Individualized surgical design is essential for aesthetical results.

Establishment and analysis of microbial limit test methods for commonly used pediatric drugs / 上海预防医学

ObjectiveTo establish microbial limit test methods for 44 pediatric drugs. MethodsAccording to the general guidelines in Chinese Pharmacopoeia （2015 and 2020 edition， volume Ⅳ），a suitability test of the methods for 44 drugs was carried out by pour-plate method， neutralization method or dilution method. ResultsTotal aerobic microbial count： chemical oral liquid samples can be tested by 1∶10 plate method；traditional Chinese medicine need to be neutralized firstly. Then oral liquids could be tested by 1∶10 plate method and 1∶100 plate method was used for granules. Total count of molds and yeasts： all the samples can be tested by the 1∶10 plate method. The recoveries of five test strains were between 0.5 and 2.0. The specified microorganisms were all detected in the test group， while not found in the negative control group. ConclusionThe microbial limit test methods for the 44 pediatric drugs are established and the results are reliable and can be used in the quality control．

Effects of EFHD2 protein deletion on tight junction proteins in mouse Sertoli cells / 安徽医科大学学报

Objective @#To study the effect of EFHD2 protein deletion in Sertoli cells on Occludin，a component of tight junction protein and the localization and expression of EF-hand domain family member D2 (EFHD2) in mouse testis．@*Methods @#Total RNA and protein were extracted from adult mice's heart ，liver ，spleen ，lung ，kidney， brain and testis tissues．The mRNA and protein levels of EFHD2 in each organ tissue were detected by qRT-PCR and Western blot．Immunofluorescence and immunohistochemistry detected the localization and expression of EF- HD2 in testicular tissues．SiRNA interference was used to reduce EFHD2 in Sertoli cells to detect Occludin protein expression. @*Results @#qRT-PCR showed that the expression of EFHD2 was the highest in the testis．Western blot results showed that the expression level increased in testis tissue．Indirect immunofluorescence and immunohisto- chemistry results showed that the protein was mainly distributed in Sertoli cells and co-localized with cytoskeletal Vimentin，indicating that the protein was expressed in Sertoli cells．After the decrease of EFHD2 protein expres- sion，Occludin protein expression also decreased．@*Conclusion @#The expression of EFHD2 protein in the testis is relatively high，mainly distributed in Sertoli cells of the testis，co-localized with Vimentin，and can affect the nor- mal expression of tight junction protein Occludin．It is suggested that EFHD2 can promote and maintain the junction structure of Sertoli cells and provide a stable microenvironment for spermatogenesis.

Prevalence of chronic diseases among bus drivers in Hefei， Anhui / 上海预防医学

ObjectiveTo analyze the effect of working conditions on the occurrence and development of chronic diseases in bus drivers in Hefei. MethodsA total of 380 bus drivers were selected by convenient sampling method. Their basic information， working intensity， working environment， working habits， living habits and physical health were investigated. ResultsThe three most common occupational-related diseases were： 1） anxiety and depression caused by work environment such as noise and traffic jam （70.79%， 269/380）； 2） dry eyes， eye fatigue， blurred vision and so on （65.53%， 249/380）； 3） cervical and lumbar pain （63.16%， 240/380）. Gastrointestinal dysfunction （irritable bowel syndrome related symptoms） occurred in 42.37% （161/380） of the drivers and 45.53% （173/380） had suffered from hemorrhoids or anal fissure. Drivers with long-term suffocation were more likely to suffer from urinary tract infection （χ 2=22.330， P<0.001）. The rate of subjective eye discomfort was higher in the drivers with long working hours （χ 2=11.682， P<0.01）， and the rate of leg swelling was higher in the drivers with frequent driving without rest （χ 2=16.642， P<0.05）. There was a significant difference in the rate of anxiety and depression between the divers with different sleep duration （χ 2=17.379，P<0.001）. Results of multiple logistic regression analysis showed that the incidence of anxiety and depression was higher in drivers with longer working hours. In comparison with the group of over 6 working hours， the rate increased to 4.080 times in the group of over 8 working hours， 2.583 times in the group of over 10 working hours， and 2.484 times in the group of over 12 working hours， respectively. Occasional and frequent non-stop working drivers were 4.302 and 4.828 times， respectively， more likely to be anxious or depressed. Logistic regression analysis also showed that the incidence of gastrointestinal dysfunction （irritable bowel syndrome related symptoms） in drivers with anxiety and depression was 3.792 times higher than that in drivers without anxiety and depression （OR=3.792， 95% CI 2.384 to 6.029， P<0.001）. ConclusionSome working environment， excessive working intensity， poor living and working habits， and mental problems are closely related to the occurrence and development of chronic diseases in bus drivers.