The incidence of bronchial asthma in children is increasing nowadays.More and more studies have showed that epigenetics plays an important role in the pathogenesis of asthma.One of them are histone modification(acetylation and deacetylation),which is catalyzed by histone acetyltransferase (HAT) and histone deacetylase (HDAC).HAT and HDAC can mediate asthma via causing Th1/Th2 imbalance,increased airway hyperresponsiveness,regulation of various inflammatory medium and so on.This paper reviews the HAT and HDAC mediated incidence of asthma and other possible mechanisms,the latest of glucocorticoid in the treatment of children with asthma epigenetic mechanisms.

Objective:To establish an evaluation index system for training effect of order-oriented clinical medical students in Xinjiang by employers, so as to lay a foundation for training effect evaluation.Methods:On the basis of questionnaires and interviews with the training requirements of employers, Delphi method was used to determine the index system and weight.Results:The training requirements of employing units for the ability of free and directional medical students in autonomous regions were in turn competent for work, knowledge and practical ability, and good moral quality. The cultivation requirements for students' personal qualities of free and directional medical students were good interpersonal communication and moral quality. After three rounds of Delphi expert consultation, the evaluation index system was established, and three dimensions (knowledge, professional ability, professional ethics literacy), nine secondary indicators and 33 tertiary indicators were screened out, and the weights were determined.Conclusion:The evaluation index of training effect of directional clinical medical students established by Delphi expert consultation method needs further validation. Through the follow-up empirical application in directional clinical students, the evaluation index system can be constantly improved, which can also provide reference for the establishment of evaluation index system for other positions.

Objective To establish the culture technology system for the in-vitro induction of adventitious buds of Sarcandra glabra(Thumb.) Nakai by investigating the induction factors of in-vitro adventitious buds.Methods Stem segments of Sarcandra glabra were cultured as explants.The effects of culture medium with different concentrations of 6-benzylaminopurine(6-BA) and indole butyric acid(IBA) added,lighting time,light intensity,and temperature on the induction of adventitious buds from the explants were observed.Results The medium containing both 6-BA and IBA was more effective to induce shoot formation of Sarcandra glabra than the medium only containing 6-BA or IBA;high concentration of plant hormones would block the growth of the plantlets.The scattering light or faint direct light was suitable for the shoot formation,while dark or strong light would induce the plantlets withered or even dead.Temperature in the range of 25 ℃～30 ℃ was beneficial for the growth of adventitious buds,and the bud induction rate arrived 100% at the temperature of 25 ℃.Conclusion At the temperature of 25 ℃,the faint sunlight or direct light less than 2000 lux,and the medium with 2.5 mg?L-1 6-BA and 0.1 mg?L-1 IBA added can stimulate significantly the adventitious bud formation of Sarcandra glabra,the induction rate up to 82.98%.

Objective To evaluate the efficacy of a two-step infusion therapy with meropenem against noso-comial multi-drug resistant Pseudomonas aeruginosa infections in elderly patients with chronic obstructive pulmonary disease.Methods 112 elderly patients with nosocomial multi-drug resistant Pseudomonas aeruginosa infections and chronic obstructive pulmonary disease were randomized into two groups:two-step infusion therapy group ( rapid first-step infusion in 30 minutes and slow second-step infusion in 2.5 hours) and traditional 30 minutes infusion therapy group.The antibiotic clinical efficacy and bacteriological efficacy were observed between two groups .Results The clinical efficacy of observation group and control group were 82.2%(46/56) vs 57.1%(32/56).The difference was statistically significant(χ2 =10.185,P<0.05);The bacteriological efficacy of observation group and control group were 75.0%(42/56) vs 46.4%(26/56),The difference was statistically significant (χ2 =10.265,P<0.05). Conclusion The clinical efficacy and bacteriological efficacy of two-step infusion therapy with meropenem against nosocomial multi-drug resistant Pseudomonas aeruginosa infections in elderly patients with chronic obstructive pulmo -nary disease were superior to the traditional therapy .

Objective To evaluate the treatment effect of acute liver failure(ALF) by xeno-transplantation of co-microencapsulated Sertoli cells and hepatocytes and the intraperitoneal immune privilege effects of Sertoli cells on hepatocytes. Methods ALF rats were induced by intraperitoneal injection of D-galactosamine and, thereafter, were treated with physical saline, free hepatocytes, microencapsulated hepatocytes, or co-microencapsulated Sertoli cells and hepatocytes (CMSH), respectively. Alanine aminotransferase (ALT), aspartate aminotransferase (AST) and total bilirubin (TBil) were detected in rats' blood samples from various groups. Expression of Smac/Diablo and caspase-3 were determined by reverse transcription-polymerase chain reaction (RT-PCR). Fifteen rats in each group were used for survival rate analysis. The intraperitoneal microencapsules were observed and lymphocytes in ascites were counted. The data were analyzed by multi-factor or single factor analysis of variance and the comparison between groups was done by t test. Results In CMSH treatment group, ALT level decreased to (533.7 ± 76.5) U/L, AST level decreased to (381.2 5± 46.7) U/L after 48 h. TBil level reduced to (7.36 ± 2.18) μmol/L after 72 h. Albumin level increased to (28.4±2.5) g/L after 48 h. All these values were significantly different from those in other groups (F=10.7,6.5,12.2,8.4;P＜0.05). The expression levels of Smae/Diablo and caspase-3 mRNA at 48 h and 72 h were lower in CMSH group than in other groups (F=3.7,4.8,3.6,4.2; P＜0.05). Survival rates in microencapsulated hepatocytes group and CMSH group were similar while both of them were higher than other groups. Microencapsules neither in microencapsulated hepatocytes group nor in CMSH group were adhered to intraperitoneal mucosa. Lymphocyte counts in ascites of CMSH group were lower than those in microencapsulated hepatocytes group (t= 4.21, P＜0. 05). Conclusions Intraperitoneal transplantation with CMSH is a promising approach for ALF treatment. Furthermore, Sertoli cells can help reduce lymphocytes' aggregation caused by encapsulated hepatocytes in ascites.

Objective To investigate the changes of fractalkine (FKN) in rat model of acute liver failure (ALF) and the role of FKN in liver inflammatory injury.Methods SD rats were divided into tWO groups:6 in normal group and 36 in model group.D-galactosamine(D-Gal) was used to induce ALF in model group.The sera and hepatic tissue samples were collected at 12,24,48,72,120 andl68 h.After D-Gal injection.FKN mRNA and nuclear factor(NF)-kB mRNA in hepatic tissue samples were detected by reverse transcription-polymerase chain reaction (RT-PCR).Results The levels of alanine aminotransferase (ALT) and aspartate aminotransferase (AST) at 12 h were(208.3±43.5)U/L and (375.2±117.3)lJ/L,respectively,which were both significantly higher than those in normal group[(31.8±2.9)U/L and (90.8±3.1)U/L](t=-9.912 and-5.935,respectively,both P<0.01);the levels of ALT and AST peaked at 72 h after D-Gal injection.The levels of FKN mRNA(O.086±0.009)in model group at 12 h were significantly higher than those (O.044±0.009) in normal group(t=-7.999.P<0.01),and peaked at 72 h (O.333±0.033),then decreased obviously at 120 h. The levels of NF-KB mRNA in the liver of normal rats were very little;and the levels in model group were increased gradually over time,then peaked at 72 h (O.583±0.i01,t=-12.607,P<0.01).FKN mRNA and NF0kB mRNA were positively correlated (r=0.760,P<0.01).Conclusion The FKN expression may play all important role in liver inflammatory injury in rat model of acute liver failure, which could provide a new approach for ALF therapy.

It is very important to establish and execute the all -sided experimental animal quality monitoring in order to guarantee human health , animal health and welfare as well as the authenticity , validity, and repeatability of the experimental research results.Setting corresponding sentinel animals in the experiment can effectively monitor the quality of experimental animals.This article gives a general review of the selection of sentinel rats in the microbiological quality monitoring of the experiment animals , contact form and time between the sentinel rats and the rats being monitored , the placement of sentinel rats, and the number of rat cages being monitored by each cage of sentinel rats , as well as the test quantity, test frequency and the project.

Objective: To observe hypoglycemic effects of Yunu Decoction, Zuogui Pill and Shenqi Pill, three compound traditional Chinese herbal medicines, in treatment of diabetes mellitus induced by alloxan in rats, and to compare the therapeutic effects among the three recipes for nourishing yin, clearing away heat, and nourishing yin and warming yang. Methods: Diabetes mellitus was induced in rats with alloxan at a dose of 60 mg/kg via tail vain injection. The diabetic rats were randomly divided into four groups: alloxan model group, Yunu Decoction-treated group, Zuogui Pill-treated group and Shenqi Pill-treated group. Rats in the three recipe groups were administered intragastrically with water extraction of Yunu Decoction, Zuogui Pill, and Shenqi Pill accordingly for 10 days. Then the level of blood glucose was measured by glucose oxidase method and the glucose tolerance was determined. Results: Compared with the normal rats, blood glucose level in the alloxan model group was obviously increased (P<0.05). Glucose levels in the three recipe groups were obviously decreased as compared with the alloxan model group (P<0.05), and glucose level in the Yunu Decoction-treated group after treatment was significant lower than before treatment (P<0.05). The glucose tolerance test indicated that rats in the alloxan model and three recipe groups revealed impaired glucose tolerance as compared with the normal rats, and there were no significant differences between the alloxan model group and the three recipe groups. Conclusion: Yunu Decoction, Zuogui Pill and Shenqi Pill can effectively decrease the glucose level of the rats with diabetes mellitus induced by alloxan, and Yunu Decoction showed the best therapeutic effects. The glucose tolerance test shows that the three recipes cannot correct the abnormal metabolism of glucose.

Objective:To investigate the incidence of asthma and the characteristics of acute attacks in children aged 3-14 in different administrative areas of Wuxi, and to analyze the correlation of asthma with the outdoor environmental factors.Methods:A total of 10 175 children aged 3-14 were randomly selected from 5 different administrative regions in Wuxi City, Jiangsu Province for childhood asthma epidemiological survey from January to December in 2017.Results:The complete questionnaires were collected from 8 318 children with a response rate of 81.70%.There were 6 734 valid questionnaires.Asthma occurred to 259 children, and the prevalence rate was 3.84%.The prevalence of asthma in male and female children was 4.89% (163 cases) and 2.82% (96 cases), respectively.The ratio of male patients to female patients was 1.70∶1.00, and the difference was significant ( χ2=19.72, P<0.01). Children were most prone to suffer from asthma attacks at the turn of seasons (87/259 cases, 33.59%). The frequency of asthma was the lowest from June to August (9/259 cases, 3.47%). Among 244 cases attacked by acute asthma, the prevailing time period of acute attacks was irregular in 88 patients (36.07%), bedtime in 64 cases (26.23%). In different regions of the city, the lowest prevalence rate of asthma was found in Binhu District (50/1 830 cases, 2.73%), the highest prevalence rate of asthma was found in Xinwu District (71/1 502 cases, 4.72%), the difference between the highest and lowest prevalence rates of asthma was significant ( χ2=13.19, P<0.05). In terms of the air quality in different admi-nistrative regions of Wuxi, the nitrogen dioxide (NO 2) concentration, the carbon monoxide (CO) concentration, PM 10 and PM 2.5 in Binhu District were lower than other 4 regions.In different seasons in Wuxi city, the sulfur dioxide(SO 2) concentration, the NO 2 concentration, the CO concentration, PM 10 and PM 2.5 from June to August were significantly lower than those in other months.The prevalence of asthma in children in different administrative districts of Wuxi was weakly positively correlated with the SO 2 concentration, the NO 2 concentration and PM 10 ( r=0.10, P<0.01; r=0.22, P<0.01; r=0.06, P<0.01, respectively). The prevalence of asthma was weakly negatively associated with the ozone(O 3) concentration ( r=-0.06, P<0.01). Acute asthma attacks were weakly positively correlated with the SO 2 concentration ( r=0.22, P<0.01), the NO 2 concentration ( r=0.28, P<0.01), the CO concentration ( r=0.23, P<0.01), PM 10 ( r=0.18, P<0.01) and PM 2.5 ( r=0.18, P<0.01), and weakly negatively correlated with the O 3 concentration ( r=-0.40, P<0.01). Conclusions:The prevalence of asthma in Wuxi is higher in boys than in girls, and the frequency of asthma attacks is related to the season.The SO 2, NO 2, CO, PM 10, PM 2.5 and O 3 concentration affect the prevalence and acute attacks of asthma.

Objective: To explore the levels of IL-22 in thymus damaged by γ-ray total body irradiation (TBI), and to study the role of IL-22 in T cell reconstitution after thymic injury induced by TBI. Methods: To induce thymic injury, mice were treated by sub-lethal TBI. Levels of intra-thymic and circulatory IL-22 were detected by using ELISA assay. Untreated mice were used as control. After receiving sub-lethal TBI, mice were intraperitoneally injected with PBS or recombinant mouse IL-22, which were marked as TBI+PBS or TBI+IL-22, respectively. Mice were monitored for counts of total thymic cells and circulatory white blood cells. Flow cytometry was applied to analyze percentages of thymic epithelial cells (TEC), thymocyte subsets and circulatory T cells. Real-time PCR assay was applied to analyze the mRNA expression levels of Foxn1, Ccl25, Aire and Dll4 in thymus. Results: ①Sub-lethal TBI treated mice expressed higher levels of intra-thymic and circulatory IL-22, compared with untreated ones (all P<0.05). ②After injection of recombinant IL-22, TBI+IL-22 mice had higher levels of intra-thymic IL-22 than TBI+PBS mice (all P<0.05). ③On day 14 after irradiation, real-time PCR assay showed that TBI+IL-22 mice had higher mRNA levels of Foxn1, Ccl25, Aire and Dll4 in thymus compared with TBI+PBS ones. Meanwhile, the TBI+IL-22 mice had higher counts of total thymic cells[(5.93±3.19)×10⁶/ml vs (1.42±0.46)×10⁶/ml, t=3.128, P=0.033] and circulatory white blood cells[(3.08±0.94)×10⁶/ml vs (1.43±0.30)×10⁶/ml, t=3.730, P=0.015] than those of TBI+PBS mice. Flow cytometry analysis indicated that TBI+IL-22 mice had higher counts of TEC and thymocytes than TBI+PBS mice on day 14 after irradiation (all P<0.05). On days 7 and 14 after irradiation, TBI+IL-22 mice had higher counts of circulatory white blood cells and T cells than TBI+PBS mice (all P<0.05). Conclusion Sub-lethal TBI induces upregulation of intra-thymic IL-22, and injecting of recombinant IL-22 increases level of IL-22 in thymus. Injecting of recombinant IL-22 improves recovery of TEC and increases numbers of thymocyte subsets and circulatory T cell after thymic injury.