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 explore the mechanism of turnover intention of junior nurses after adverse events from three aspects: work pressure, leadership style and personal characteristics.Methods:This study was a cross-sectional survey, using the convenience sampling method, 289 nurses from Shanxi Bethune Hospital from December 2020 to March 2022 were selected as the research subjects, and the general data questionnaire, the Separation Tendency Scale, the Nurses′ Work Stressor Scale, the Service-oriented Leadership Style Scale, and the Prospective Personality Scale were used to survey them.Results:Structural equation model showed that nurses′ job stressor level positively predicted turnover intention, with a path coefficient of 0.74, P<0.01, while service-oriented leadership style and forward-looking personality negatively predicted turnover intention, with path coefficients of -0.60 and -0.37, respectively, both P<0.01. Hierarchical regression analysis showed that both service-oriented leadership style and forward-looking personality negatively moderated the promotion of job stressors on turnover intention, and the moderating effect regression coefficients were -0.146, -0.215, both P<0.01. Conclusions:Hospitals should improve the prospective personality traits of junior nurses and cultivate the service-oriented leadership style of nursing managers after adverse events, so as to reduce the turnover tendency of junior nurses as the second victim, promote the improvement of nursing quality, and stabilize nursing team development.

Objective: To analyze the clinical features of perianal condyloma acuminatum in HIV infected men who have sex with men (MSM) and assess the effects of combined treatment of microwave and photodynamic therapy. Methods: Clinical and laboratory data of 260 male patients with perianal condyloma acuminatum were collected and microwave combined with photodynamic therapy was applied on them. Results: The majority of the patients with perianal condyloma acuminatum were young people (243/260). Warts were mainly located in the anus or from the outside to inside of the anus (245/260). Among them, the proportion of warts position of extraanal in HIV-infected group (8/220) was lower than that of non-HIV-infected group (7/40). HPV types 11 (70/118), 6 (44/118) and 16 (40/118) were the most common types of HPV infection. People with HIV infection were more likely to develop high-risk, mixed types HPV infection and multiple HPV infection than those without HIV infection. More than half of the patients (146/260) needed only 1-3 sessions of photodynamic treatments. There was no significant difference in the times of photodynamic treatments and the numbers of photosensitizers required between the HIV-infected and non-HIV-infected groups. The recurrence rate of HIV-infected group (13.6%, 30/220) was also similar to that of non-HIV-infected group (15.0%, 6/40), but far lower than those who underwent microwave therapy alone (45%, 18/40). Conclusions The combination therapy significantly reduced the recurrence rate of perianal condyloma acuminatum in HIV infected MSM.