Objective To investigate the expression and effect of elastin in full-term rats with hyperoxia induced by chronic lung diseases. Methods One hundred and forty-four full-term rats are randomly exposed to hyperoxia (hyperoxia group)and room air(room air group).Chronic lung disease(CLD)is induced by hyperoxia exposure. Gomori's stain for elastic fibers and in situ hybridization methods were used to detect the expressions of secondary crest and tropoelastin mRNA on the 1st,3 rd, 7th, 10th,14th and 21st days after exposure. Results The expressions of secondary crest decreased significantly in hyperoxia group, compared with room air group on the 3rd to 14th days(P＜0.05).The expressions of tropoelastin mRNA decreased significantly in hypemxia group, compared with room air group on the 3rd to 10th days (P＜0.05),otherwise increased significantly from the 14th to 21 st days(P＜0.05). Hyperoxia exposure can delay the peak of tropoelastin mRNA. Conclusion Elastin is involved in the inhibition of alveolarization and lung fibrosis in the development of CLD.

Objective: To investigate the affecting factors of type 1 diabetes mellitus(T1DM) in children, and to provide reference for the prevention and treatment measures in the future. Methods: A case-control study was carried out among 106 children diagnosed with T1DM in a hospital in Shenyang. At the same time, 106 healthy children were selected as the control group by 1∶1 matching of age, gender and living area. The early life-related factors that may affect the development of T1DM in two groups were investigated by questionnaire. Results: The average age of diagnosis in 106 cases with T1DM was(8.02±3.49) years, girls accounted for 60.4% and boys 39.6%. Multi-factor Logistic regression analysis showed that high family socioeconomic status and higher education of fathers were associated with lower odds of development of T1DM. Family member smoking(OR=2.51, 95%CI=1.19-5.29), family history of diabetes(OR=2.56, 95%CI=1.18-5.55), maternal obesity(OR=5.42, 95%CI=2.49-11.83) and infection during pregnancy(OR=3.45, 95%CI=1.04-11.46) were associated with higher risk of T1DM(P<0.05). Conclusion The occurrence of T1DM in children is affected by many factors including heredity, maternal health during pregnancy and family economy,highlighting the importance of early life prevention of T1DM.

Objective: To investigate the prevalence and associated factors of eczema in children in order provide reference for the prevention and treatment of eczema. Methods: Two primary schools in a district of Shenyang were randomly selected to conduct a questionnaire survey on 2 240 students in May 2017. Children with eczema need to be diagnosed by a doctor. Results: There were 838 cases of eczema with a reported rate of 37.4%, 38.7% in boys and 36.1% in girls. The age of 6 to 12 months was the peak period of first eczema in children, and the proportion of eczema within 1 year was up to about 70%. Children who have had eczema in the past were now more likely to catch a cold, and the reported rates of allergic rhinitis, asthma and food allergies were also significantly higher. The Logistic regression analysis showed that the mother was unhappy during pregnancy(OR=1.32,95%CI=1.03-1.69), the parents were more educated (OR=1.60, 95%CI=1.19-2.16), and the parents were allergic (OR=1.58,95%CI=1.07-2.33；OR=1.41, 95%CI=1.02-1.94), family history of diabetes(OR=1.95, 95%CI=1.41-2.68), and cesarean(OR=1.33, 95%CI=1.07-1.65) were risk factors of eczema in children. Conclusion The incidence of children eczema is affected by maternal mood during pregnancy, family factors and delivery mode. It is of practical significance to prevent children eczema in early development for reducing the incidence of other allergic diseases in the future.

Abstract As a new type of pollutant, microplastics have attracted extensive attention. Children in a critical stage of growth and development are vulnerable to microplastics. Summarzing the relevant laws and regulations and the source of microplastics, the paper demonstrates the ways of microplastics entering human body, some toxic effects of microplastics found in recent experimental studies and their potential hazards to children s health are introduced in detail.

In rkcknt ekars,thk incidknck of childhood obksite has also incrkaskd ekar be ekar as pkoplk＇s living standards ckkp improving. Ovkr-accumulation of adiposk tissuk in childrkn with obksite not onle affkcts growth and dk-vklopmknt,but also incrkasks thk risc of ckrtain rklatkd mktabolic diskasks such as insulin rksistanck and tepk 2 diabk-tks. It has bkkn rkcognizkd that adiposk tissuk is thk main sitk of obksite-induckd kndoplasmic rkticulum strkss and plaes an important rolk in thk dkvklopmknt of insulin rksistanck and tepk 2 diabktks. Ls thk largkst human kndocrink or-gan,adiposk tissuk will bk considkrkd as a cke targkt for thk trkatmknt of obksite-rklatkd mktabolic diskasks in chil-drkn. Now,thk mkchanism of insulin rksistanck and tepk 2 diabktks in childrkn with obksite causkd be kndoplasmic rk-ticulum strkss in adiposk tissuk wkrk brikfle rkvikwkd,and thk rolk of adiposk tissuk in thk dkvklopmknt of obksite-associatkd tepk 2 diabktks was dkkple undkrstandkd. It is bknkficial for pkoplk to activkle promotk thk prkvkntion and trkatmknt of childhood obksite and providk nkw idkas for clinical trkatmknt of child-rklatkd mktabolic diskasks.

Objective: To understand the prevalence of overweight and obesity, dietary habits and main food intake frequency among primary school students in Shenyang, so as to provide a reference for exploring the effect of diet related factors on the development of overweight and obesity in children. Methods: A total of 2 041 students from two primary schools in a certain district of Shenyang were selected by convenience sampling in May 2017, with height and weight measured, meanwhile the questionnaire survey regarding dietary habits and the frequency of main food intake were administered. Results: The rates of overweight and obesity were 18.4% and 22.1% respectively, and the rate of overweight and obesity in boys (21.0%，27.8%) were significantly higher than that in girls (15.8%,16.2%)(χ 2=22.45,53.40，P<0.01). The results of univariate analysis showed that frequency of eating breakfast, eating speed, appetite, picky eaters or not, and the frequency of fruit, seafood and canned food intake were associated with overweight and obesity in primary school students (χ 2=7.67，97.92，229.70，95.88，6.40，6.58，7.96，P<0.05). Multivariate Logistic regression analysis showed that slow eating speed (OR=0.46, 95%CI=0.29-0.69) and normal eating speed (OR=0.47, 95%CI=0.32-0.69) were associated with lower rates of overweight and obesity; good appetite (OR=43.73, 95%CI=5.88-325.36) was associated with higher rates of overweight and obesity in primary school students (P<0.01). Conclusion The detection rate of overweight and obesity is relatively high among primary school students in Shenyang, and the rate of obesity is already higher than that of overweight; The frequency of common food intake has little impact on the development of overweight and obesity in primary school students, but fast eating speed and good appetite are the risks of overweight and obesity among them.