Background As the main cellular constituent of corneal epithelium,corneal epithelial cells play critical roles in regulating and controlling the migration, proliferation and differentiation of cells during the repair of damage.MicroRNA (miRNA) is endogenously expressed small non-coding RNAs, which participates in a variety of biological processes.Previous studies demonstrated that miR-204 is highly expressed in normal corneal epithelium,but its function is still unclear.Objective This study was to investigate the function and mechanism of miR-204 in corneal epithelial cell proliferation.Methods Corneal epithelial tissue was collected during the corneal refractive surgery from the patients with refractive error under the informed consent, and human corneal epithelial cells(HCECs) were cultured and passaged.The relative expressing levels of miR-204 mRNA in the normal corneal epithelium and HCECs were detected by real time quantitative PCR.Cultured HCECs were evenly divided into three groups.The liposome with miR-204 mimic was transfected into the cells of the miR-204 mimic group, and blank liposome was transfected in the cells of the positive control group,and regularly cultured cells served as the normal control group.Cell proliferation capability was evaluated by colony-forming assay, and the percentage of the cells in different cell cycles was analyzed by flow cytometry.Western blot assay was employed to detect the expression levels of p-RB, E2F1 ,p27,CyclinA, CDC2, p-CDC2 and CDK2 proteins in the cells.Results The relative expression levels of miR-204 mRNA were 1.077 ±0.268 in the normal corneal epithelium and 0.041 ±0.018 in the HCECs, showing a significant difference between them (t =7.700,P＜0.001).The cloning cell number was evidently decreased in the miR-204 mimic group in comparison with the positive control group and normal control group.The percentage of cells in the G1 phase was 47.75％ in the miR-204 mimic group, which was significantly higher than 37.23％ in the positive control group and 40.72％ in the normal control group.The expression levels of E2F1 and p27 proteins in the cells were elevated (t=14.87,25.11;both at P＜0.01) and those of CDK2 and p-CDC2 proteins were decreased (t=5.39,10.65;both at P＜0.01) in the miR-204 mimic group in comparison with the positive control group.Conclusions The overexpression of miR-204 in the normal corneas probably is associated with non-proliferation status of corneal epithelial cells.Transfection of miR-204 into corneal epithelial cells can inhibit the proliferation of corneal epithelial cells probably by up-regulating the expression of E2F1 and p27 and suppressing the expression of CDK2/CyclinA and p-CDC2/CyclinA,which lead to cell arrest in G1 phase.

Objective To confirm the structure validity of questionnaire through a probe into latent factorial structure of the rear service personnel′s job satisfaction from polyclinics hospitals .Methods The questionnaire′s construct validity was estimated by ex‐ploratory factor analysis (EFA) and confirmatory factor analysis(CFA) .Results Exploratory factor analysis made the question‐naire including six factors which belonged to job satisfaction and occupation loyalty .Every factor had reasonable explanation and six factors remained 70 .306% information .Exploratory factor analysis of job satisfaction showed five factors ,explaining 70 .514% in‐formation .The confirmatory factor analysis model 1 and model 2 were conducted by LISREL8 .70 software .The results showed that X2 freedom degree was less than 5 .In addition to adjust the goodness of fit index was less than 0 .9 ,all other fit indices were greater than 0 .9 .At the same time ,SRMR and RMSEA were less than 0 .08 .Conclusion The results of exploratory factor analysis(EFA) and confirmatory factor analysis(CFA) both reveal that the questionnaire′s construct validity was good .

Objective To investigate the value of protective transverse colostomy in decreasing postoperative anastomotic leakage and stricture after laparoscopic resection for rectal cancer.Methods The clinical data of 128 patients with rectal cancer who were admitted to the Jinhua Hospital of Zhejiang University from March 2008 to February 2012 were retrospectively analyzed.All the patients received laparoscopic anterior resection of rectal cancer after neoadjuvant chemoradiotherapy.Sixty-one patients received protective transverse colostomy (colostomy group) and 67 patients did not receive protective transverse colostomy (non-colostomy group).The incidences of postoperative anastomotic leakage and stricture,condition of the patients and the prognosis of the patients in the 2 groups were compared.Patients were followed up via out-patient examination,in-patient chemotherapy or phone call till May 2013.All data were analyzed using the t test,chi-square test or Fisher exact probability.Results The overall incidence of postoperative anastomotic leakage was 7.03％ (9/128).The incidences of postoperative anastomotic leakage in the colostomy group and non-colostomy group were 6.56％ (4/61) and 7.46％ (5/67),with no significant difference between the 2 groups (x2 =0.000,P ＞ 0.05).The systemic condition of 4 patients who were complicated with anastomotic leakage in the colostomy group was comparatively better,and all of them were cured by conservative treatment.The condition of 5 patients who were complicated with anastomotic leakage in the non-colostomy group was severe,and 4 of them received reoperation,with the reoperation rate of 4/5 ; the other patient received conservative treatment.There was significant difference in the reoperation rate between the 2 groups (P ＜0.05).The overall incidence of postoperative anastomotic stricture was 13.28％ (17/128).The incidences of postoperative anastomotic stricture in the colostomy group and the non-colostomy group were 19.67％ (12/61) and 7.46％ (5/67),with significant difference between the 2 groups (x2=4.133,P ＜ 0.05).The incidences of severe anastomotic stricture of the colostomy group and the non-colostomy group were 8.20 (5/61) and 0,respectively.Conclusion Protective transverse colostomy could not reduce the incidence of postoperative anastomotic leakage,but could mitigate the symptoms followed anastomotic leakage and reduce the reoperation rate.Protective transverse colostomy may improve the incidence of anastomotic stricture,therefore it should be applied cautiously.

The management of emerging infectious diseases has always been given a high priority in public health. Identification of the epidemiological characteristics and transmission patterns of emerging infectious diseases is of great significance to contain the disease transmission and reduce the damages to public health and socioeconomic developments. Currently, infectious disease dynamics models are mainly established based on infectious disease surveillance data to predict the epidemiological patterns and trends of emerging infectious diseases; however, many model-based predictions fail to achieve the expected results due to the presence of multiple uncertain factors during the integrated management of infectious diseases. This review describes the basic principles and variables of common infectious disease dynamics models, including the susceptible-infected-recovered ( SIR ) model, susceptible-infected-removed-susceptible ( SIRS ) model, susceptible-exposed-infected-removed ( SEIR ) model and improved SEIR model, compares the advantages and disadvantages of these models, and summarizes the advances of the infectious disease dynamics models in the prediction of trends in incidence of emerging infectious diseases, so as to provide insights into the effective application of infectious disease dynamics models in the management of infectious diseases.

Objective: To analyze the trend of the burden of leukemia among people under 35 years in China from 1990 to 2019. Methods: Incidence, mortality and disability-adjusted life years (DALY) of leukemia among people under 35 years in China from 1990 to 2019 were collected by using the Global Burden of Disease (GBD) Study Database 2019. The trends in leukemia incidence, mortality and DALY rates were analyzed using the average annual percent change (AAPC) and age-period-cohort model. Results: From 1990 to 2019, the incidence, mortality and DALY rates of leukemia among people under 35 years in China showed a downward trend (AAPC=-2.336%, -3.604% and -3.589%, all P<0.05), with more pronounced downward trends in females (AAPC=-3.209%, -3.787% and -3.818%, all P<0.05) than in males (AAPC=-2.521%, -3.292% and -3.306%, all P<0.05). According to the age-period-cohort model, the risks of leukemia incidence, mortality and DALY rates decreased with increasing age. Among them, the children under 5 years had the highest risks of leukemia incidence, mortality and DALY rates (RR=4.697, 2.718 and 3.059). Over time, the risks of leukemia incidence, mortality and DALY rates also decreased from 1990-1994 (RR=1.217, 1.264 and 1.296) to 2015-2019 (RR=0.901, 0.696 and 0.691). With regard to birth cohorts, the risks of leukemia incidence, mortality and DALY rates first increased and then decreased, peaking in the 1986-1990 birth cohort (RR=1.335, 1.192 and 1.231). Conclusions The incidence, mortality and DALY rates of leukemia among people under 35 years in China from 1990 to 2019 showed a downward trend. Males and children under 5 years were the key populations for leukemia prevention and control.

Objective To compare the efficacy and toxicities between preoperative concomitant boost intensity-modulated radiotherapy (IMRT) and 3-dimensional conformal RT (3-DCRT) for locally advanced rectal cancer.Methods A prospective study from May 2010 to May 2015.A total of 130 patients with histologically confirmed,newly diagnosed,locally advanced rectal adenocarcinoma (cT3-T4 and/or cN +) located within 10 cm from the anal verge were included in this study.The patients were divided into IMRT and 3D-CRT groups by random number table method.Sixty-six patients were treated with IMRT,and the other sixty-four patients were treated with 3-DCRT.In the IMRT group,the prescription dose was 1.8 Gy/fraction to 45 Gy to the pelvis and 2.2 Gy/fraction to 55 Gy to the gross tumor volume simultaneously.The 3D-CRT prescription was 45 Gy in 25 fractions to the pelvis.Capecitabine (1 650 mg· m 2 · d-1) was given twice daily from days 1 to 14 and days 22 to 35 during RT in both arms.Total mesorectal excision (TME) was scheduled 6-8 weeks after the completion of chemoradiation.Results There were no significant differences in age,gender,tumor location,pathological differentiation degree and clinical stage between the two groups.Two patients withdrew from the study:one for grade 3 radiation dermatitis in IMRT group and the other for grade 3 fatigue in 3D-CRT.There was no significant difference in hematologic or nonhematologic toxicities between the two groups.No grade 4 or 5 toxicity was observed in either group.Compared with conformal radiotherapy,IMRT did not increase the difficulty of surgery.No significant difference was found in type of surgery or postoperative complications between the two groups.The rate of tumor regression grade (TRG) 4 (pathologic complete response,pCR) was 22.7％ for IMRT and 15.6％ for 3D-CRT,respectively(P ＞ 0.05).The rate of both TRG4 and 3 was 42.4％ for IMRT and 25.0％ for 3D-CRT,respectively (x2 =4.406,P=0.036).Conclusions Neoadjuvant concomitant boost IMRT is feasible and has a higher histopathological regression for patients with locally advanced rectal cancer.Trial registration Chinese clinical trial registry,ChiCTR-IN R-16008004.

ObjectiveTo discuss the incidence,treatment and effect of cryptogenic hemoptysis (CH).MethodsPatients with CH were selected from 231 patients with hemoptysis according to clinical evaluation,chest radiography,fiberoptic bronchoscopy and CT scan,and the clinical data and treatment methods were retrospectively analyzed.ResultsFifty-three of 231 patients referred for CH,the incidence of CH was 22.94 ％ (53/231),of which 45 (45/53,84.91％ ) received internal conservative treatment and 8 (8/53,15.09％) received bronchial artery embolization (BAE).High resolution CT (HRCT) showed ground-glass opacities in 20 CH patients after hemoptysis.Bronchial arteriography showed abnormalities,including arterial enlargement and localized hypervascularity in 8 patients and systemic to pulmonary shunting in 3 patients.No recurrence of hemoptysis was observed during 1 to 8-year follow-up.ConclusionBleeding can be controlled in most of CH patients by internal conservative treatment,only a few patients with massive hemoptysis need BAE,and both treatments have good short and long term results.

Objective Based on the experience of the first round cooperation between Jinhua Municipal Central Hospital and School of Medicine,Zhejiang University,to evaluate the effects of this collaboration and provide reference for the next round cooperation.Methods A database of research performance from 2008-2017 was established to compare the scientific research situation of collaborating disciplines and non-collaborating disciplines before and after the cooperation between.Results The quality and quantity of scientific research projects,funds,papers were promoted after cooperation,and the improvement of collaborating disciplines was greater than non-collaborating disciplines.Conclusions The hospital college cooperation was helpful to promote the scientific research situation in a district hospital.It should be paid attention to the balance of disciplines development and improve the quality of scientific research in the next round cooperation.

This study was aimed to investigate the mechanism of leukemia cell apoptosis induced by histone deacetylase inhibitor (HDACI). Flow cytometry was used to detect the apoptosis of leukemia cell lines NB4, U937 and Jurkat, and the changes of mRNA and protein expressions of TRAIL, DR4 and DR5 were detected by Western blot and RT-PCR respectively. The results showed that both TRAIL and DR5 protein and mRNA expressions in NB4, U937 and Jurkat cells increased after treated with sodium butyrate (SB) and in time-dependent manner. However, DR4 mRNA in leukemia cells was not significantly changed after treated with SB. It is concluded that the apoptosis mechanism of leukemic cell lines NB4, U937 and Jurkat induced by SB is closely related to the protein and mRNA expressions up-regulating TRAIL and DR5, but the DR4 may not participate in the apoptosis induced by SB.
Apoptosis ; drug effects ; Cell Line, Tumor ; Histone Deacetylase Inhibitors ; pharmacology ; Humans ; Isobutyrates ; pharmacology ; Receptors, TNF-Related Apoptosis-Inducing Ligand ; metabolism ; TNF-Related Apoptosis-Inducing Ligand ; metabolism

Objective To investigate the prevalence and influencing factors of sub-health status of the migrant workers in Dongguan City,in order to provide scientific preferences for preventing sub-health status.Methods Using the stratified random sampling method,740 migrant workers from ten towns(disetricts) in Dongguan city from August 2015 to August 2016 were recruited in this study.The sub-health measurement scale version 1.0 (SHMS V1.0) was applied to evaluate the sub-health status of migrant workers.The SHMS V1.0 scores were compared among migrant workers with different demographic characteristics,and the multivariate linear regression analysis was utilized to explore the influencing factors.Results A total of 718 valid questionnaires were collected,and the effective recovery rate was 97.03％.The sub-health status was detected in 483 migrant workers,and the prevalence rate of sub-health status was 81.6％.The migrant workers' subscale scores of physical sub-health (PS),mental subhealth (MS),social sub-health (SS) and total scale (TS) were (70.25-4-12.25),(64.21± 13.83),(62.21-4-13.87) and (66.114-11.15),respectively.The PS scale scores among migrant workers with different monthly household incomes per capita,and different inhabit situations;the MS scale scores among migrant workers with different ages,educations,marital status,monthly household incomes per capita,and inhabit situations;the SS scale scores among migrant workers with different genders,educations,and inhabit situations;and TS scores mong migrant workers with different educations,monthly household incomes per capita,and inhabit situations were statistically significant different (P＜0.05).The multivariate linear regression analysis showed that educations and inhabit situations were the influencing factors for TS score (P＜0.05).Conclusion The sub-health status of migrant workers in Dongguan City is serious,and the influencing factors are educations and inhabit situations.