BACKGROUND:Mesenchymal stem cells(MSCs) have immunoregulation,can reduce the occurrence rate of graft versus host disease following transplantation,and treat autoimmune disease. OBJECTIVE:To observe the immunoregulation of human umbilical cord(UC) -MSCs on bone marrow T-lymphocyte of patients with aplastic anemia. DESIGN,TIME AND SETTING:A randomized grouping design,in vitro cytological controlled study. Cases were obtained from the Department of Hematology,First Hospital and Second Hospital Affiliated to Nanchang University. Experiments were conducted at the Institute of Hematology,Second Hospital Affiliated to Nanchang University from September 2007 to November 2008. PARTICIPANTS/MATERIALS:A total of 22 patients with aplastic anemia were enrolled at the Department of Hematology,First Hospital and Second Hospital Affiliated to Nanchang University. There were 6 cases of severe aplastic anemia(3 males and 3 females) ,with a median age of 38(16-68) years;16 cases of chronic aplastic anemia(9 males and 7 females) ,with a median age of 41(25-59) years. Umbilical cord was obtained from healthy full-term fetus by normal uterine-incision delivery for isolation,culture and determination of human UC-MSCs. METHODS:MSCs were extracted from human umbilical cord. T-lymphocytes were isolated from bone marrow of patients with aplastic anemia by density gradient centrifugation. MSCs were cocultured with T-lymphocytes. In the control group,T-lymphocytes were incubated at 1?105/well. In the UC-MSCs group,human UC-MSCs were incubated at various densities of 1?105/well,0.5?105/well,0.1?105/well and 0.05?105/well. In the experimental group,T-lymphocytes were cocultured with UC-MSCs at 1:1,1:0.5,1:0.1,1:0.05. MAIN OUTCOME MEASURES:Inhibitory rate of human UC-MSCs at various concentrations on T-lymphocytes of aplastic anemia patients was measured by MTT assay. CD4+/CD8+ changes of the T cells were analyzed by flow cytometry. Expression of the two marrow hematopoietic factors(interleukin-2 and ?-interferon) in the supernatant was evaluated by ELISA. RESULTS:The second passage of MSCs had typical morphology of fibroblast,and highly expressed CD166,CD29,CD54,but lowly expressed CD13,CD34,CD45. MSCs could be induced into adipocytes. UC-MSCs showed inhibitory effect on lymphocyte proliferation of aplastic anemia patients when UC-MSCs and lymphocytes mixed at the ratio of 1:1,0.5:1,0.1:1,and their inhibitory rate were(56.2?12.1) %,(43.7?10.4) %,(28.6?8.9) %. The effect was the strongest at the ratio of 1:1. UC-MSCs adjusted the proportion of CD4+ and CD8+,inhibited the secretion of interleukin-2 and ?-interferon by T cells of aplastic anemia patients. CONCLUSION:Human UC-MSCs can mediate an immunoregulation effect on T lymphocytes of aplastic anemia patients in vitro and the inhibitory effects are dependent on the amount of UC-MSCs.

To investigate the therapeutic effect of peroxiredoxin-6(PRDX6)on ultraviolet-induced corneal injury in rats and explore the mechanism.The rat model of corneal injury was established by exposing to ultravio-let.Male wister rats were randomly divided into control groups,dexamethasone (DXM)groups and PRDX6 groups,the rats were administered four times a day and for 12 days.The corneal opacity was observed with a slit-lamp microscope.Histopathologic changes were observed with light microscopy.The content of corneal malonalde-hyde(MDA)was determined by thiobarbituric acid test and the total antioxidative capacity(TAOC)was detected by chemical colorimetric test.P38 MAPK signal pathway was detected with the method of Western blot and the gene expression of cytokines were measured by RT-PCR method.Compared with the control group,PRDX6 treat-ment significantly reduced corneal opacity,improved corneal pathology injury,decreased the MDA content and in-creased the TAOC.In the PRDX6 group the level of phosphorylated p38 protein was significantly lower than that in the control group.The gene expression of cytokine were different between control and PRDX6 groups(P <0.05).PRDX6 showed therapeutic effect in the rat model of ultraviolet-induced corneal injury.This maybe be concerned with that it could alleviated the oxidative damage,suppressed p38 MAPK phosphorylation and regulate the gene expression of cytokine.

Objective To estimate heart function among patients with diabetic foot ulcer,and to investigate the characteristics of heart failure(HF) before and after treatment of ulcer. Methods Items associated with diabetes and some physiological and biochemical indicators were observed in patients with diabetic foot ulcer(162 cases) and with high risk factors of ulcer(75 cases). Heart function was evaluated at patients′ admission, during ulcer related treatment, and prior to discharge. Left ventricular ejection fraction and other cardiac assessment were measured with ultrasonic scan.Results During hospitalization, 23.6%(56/237) patients underwent HF with normal left ventricular ejection fraction, and it was 27.2%(44/162) in patients with foot ulcers. The prevalence of HF was 8.9%(21/237) in all patients studied on admission, and that was 10.5%(17/162) in patients with foot ulcer, more than that without foot ulcer(P＜0.01). More patients with HF were found, being 14.8%(35/237) during 2-7 days after ulcer related treatment initiated, and peak was on the 4th day. There was statistical difference among different Wagner grades(P＜0.05) about the morbidity rate of HF. All patients with HF were improved and tolerant to ulcer related treatment. Conclusion The prevalence of HF with normal left ventricular ejection fraction was relatively high in patients with diabetic foot ulcer, especially after ulcer treatment.

Objective: To investigate the changes of the intestinal mucosa-associated microbiota in the patients with ulcerative colitis (UC), and to explore their correlation with the clinical manifestations. Methods: From June to October 2016, at Gastrointestinal Endoscopy Center, the Second Affiliated Hospital of Xi′an Jiaotong University, 28 patients with UC and 16 healthy individuals who underwent colonoscopy examination were enrolled. The mucosa specimens of them were collected for fluorescent in situ hybridization (FISH). The bacterial flora were observed and counted, the correlation between the bacterial flora and the clinical manifestations were analyzed. Kruskal-Wallis test and Spearman rank correlation analysis were performed for statistical analysis. Results: Among 28 patients with UC, 16 were at active phase and 12 at remission phase. The number of total bacteria flora, Escherichia coli, Clostridium and Bacteroides of the active UC group and remission UC group were all more than those of healthy control group; however the number of Lactobacillus and Bifidobacteria were less than those of healthy control group, and the differences were statistically significant (χ²=23.34, 19.94; 23.40, 12.96; 23.39, 19.16; 23.32, 10.46; 23.19, 4.25; 18.94, 12.33; all P<0.05). The number of total bacteria flora, Escherichia coli and Bacteroides of the active UC group were more than those of the remission UC group, however the number of Lactobacillus and Bifidobacteria were less than those of the remission UC group, and the differences were statistically significant (χ²=7.32, 5.63, 5.62, 20.38 and 4.82; all P<0.05). In the patients with UC, the defecation frequency was positively correlated with the count of Bacteroides (r=0.459, P=0.014) and was negatively correlated with the count of Lactobacillus (r=-0.634, P<0.01). In UC patients, bloody stool, endoscopic appearance and total Mayo score were positively correlated with the counts of universal bacteria, Escherichia coli and Bacteroides (r=0.469, 0.403, 0.376; 0.604, 0.562, 0.475; 0.551, 0.463, 0.461; all P <0.05); and which were negatively correlated with Lactobacillus and Bifidobacteria (r=-0.570, -0.413; -0.899, -0.458; -0.862, -0.480; all P<0.05). The evaluation by the doctors was positively correlated with the counts of Escherichia coli (r=0.415, P=0.028), however was negatively correlated with Lactobacillus and Bifidobacteri (r=-0.841, -0.529; both P<0.01). Conclusion The intestinal microbiota have sigificantly changed in patients with UC which are correlated with some clinical manifestations of UC.

Objective:To explore the application value of artificial intelligence-assisted diagnosis system for TBS report in cervical cancer screening.Methods:A total of 16 317 clinical samples and related data of cervical liquid-based thin-layer cell smears, which were obtained from July 2020 to September 2020, were collected from Southern Hospital, Guangzhou Huayin Medical Inspection Center, Shenzhen Bao′an People′s Hospital(Group) and Changsha Yuan′an Biotechnology Co., Ltd. The TBS report artificial intelligence-assisted diagnosis system of cervical liquid-based thin-layer cytology jointly developed by Southern Medical University and Guangzhou F. Q. PATHOTECH Co., Ltd. based on deep learning convolution neural network was used to diagnose all clinical samples. The sensitivity,specificity and accuracy of both artificial intelligence-assisted diagnosis system and cytologists using artificial intelligence-assisted diagnosis system were analyzed based on the evaluation standard(2014 TBS). The time spent by the two methods was also compared.Results:The sensitivity of artificial intelligence-assisted diagnosis system in predicting cervical intraepithelial lesions and other lesions (including endometrial cells detected in women over 45 years old and infectious lesions) under different production methods, different cytoplasmic staining and different scanning instruments was 92.90% and 83.55% respectively, and the specificity of negative samples was 87.02%, while that of cytologists using artificial intelligence-assisted diagnosis system was 99.34%, 97.79% and 99.10%, respectively. Moreover, cytologists using artificial intelligence-assisted diagnosis system could save about 6 times of reading time than manual.Conclusions:Artificial intelligence-assisted diagnosis system for TBS report of cervical liquid-based thin-layer cytology has the advantages of high sensitivity, high specificity and strong generalization. Cytologists can significantly improve the accuracy and work efficiency of reading smears by using artificial intelligence-assisted diagnosis system.