Objective To assess the effects of cyclic stretch on fibroblast orientation in order to find the appropriate cyclic stretch to cause maximum fibroblast orientation and to explore the mechanism of cell signalling since cells are known to orient in response to the application of mechanical forces. Methods Human forehead dermal fibroblasts were seeded onto collagen coated flexible membranes. Membranes were then deformed at 10 cycles per minute by the application of 135 mmHg subatmospheric pressure. This corresponded to strain levels of 0% to 24% from the center to extremity of the flexible membrane. Cells orientation angles were studied by inverted microscopy. Integrin ?1 distribution were studied with immunocytochemical staining and confocal microscopy. Integrin ?1 expression and focal adhesion kinase ( FAK) phosphorylation were analyzed with Western blot analysis. Results A minimum of 15% cell stretch was required to significantly stimulate the fibroblast orientation response. Cyclic stretch induced integrin ?1 redistribution and FAK phosphorylation. Incubation of cells with anti-integrin ?1 prior to the application of stretch abrogated fibroblast orientation and FAK phosphorylation. Conclusion Fibroblast orientation in response to cyclic stretch is mediated at least in part by integrin ?1 through phosphorylation of FAK.

Objective To explore the expression and significance of matrix metalloproteinase (MMP)-9, IV collagen and CD34 in epithelial ovarian tumor. Methods Eighty-two patients with epithelial ovarian tumor, among them,there were 48 malignant epithelial ovarian carcinomas, 23 borderline epithelial ovarian tumors and 11 benign epithelial ovarian tumors. The expression of MMP-9, IV collagen and CD34 were detected by immunohistochemistry. Results The expression of MMP-9 was strongly linked to the degree of malignant ovarian carcinomas (F= 39.306,P< 0.01). The expression of CD34 was also strongly linked to the degree of malignant ovarian carcinomas [benign epithelial ovarian tumors was (17.18±5.64)%,borderline epithelial ovarian tumors was (29.76±7.18)%,well-differentiated malignant epithelial ovarian carcinomas was (57.20±8.55)%,moderately-differentiated malignant epithelial ovarian carcinomas was (71.20±8.48)%, poorly-differentiated malignant epithelial ovarian carcinomas was(90.38±20.03)%](F= 100.072, P < 0.01). The expression of IV collagen in malignant epithelial ovarian carcinomas was different from that in borderline epithelial ovarian tumors and benign epithelial ovarian tumors (F = 11.554,P<0.0l). The expression of MMP-9 was positive correlation with the loss expression of IV collagen and the expression of CD34 (r=0.796,0.802,P< 0.01).Conclusions The positive expression of MMP-9,CD34 and the negative expression of IV collagen are obviously relevant to degree of malignant ovarian carcinomas.The combined testing on expression of MMP-9,CD34, IV collagen on ovarian carcinomas is significant to decide degree of malignant ovarian carcinomas and evaluate future development.

Objective: To investigate the distribution of various types of screen time and examine the association of screen time with psychological and behavioral development problems in children aged 3-6 years, so as to provide scientific basis for children s screen use and mental health promotion. Methods: A total of 3 875 mother child dyads who completed the follow up in Shanghai Maternal-Child Pairs Cohort were included. The daily usage time of children s tablet, mobile phone, TV, projectors, and other types of screens were obtained in questionnaire survey. Children s psychological and behavioral development problems were evaluated by Age-Stage Questionnaire, Third Edition (ASQ-3) and Strengths and Difficulties Questionnaire (Parent version) (SDQ). The Chi-square test, Mann Whitney U and Kruskal Wallis rank sum test were used to compare the detection rate of psychological and behavioral development problems and screen time in children with different characteristics. Multivariate binary Logistic regression was used to analyze the association of screen time with psychological and behavioral development problems. Results: There were 49.91% of children having screen time more than 1 h/d. Children s TV, tablet and mobile phone screen time were 0.39(0.25, 0.96 ), 0.25(0,0.61) and 0.18(0,0.25) h/d. The detection rates of suspected developmental delay in fine motor, problem solving and personal-social domains and pro social behavior deficiency and externalizing behaviors in boys (8.54%, 6.77%, 5.46%, 30.07 %, 27.39%) were higher than that in girls (4.64%, 4.85%, 2.48%, 22.10%, 22.36%) ( χ 2=23.76, 6.49, 22.37, 31.81, 13.06, P <0.05). There were statistically significant differences in the detection rates of suspected developmental delay in communication, fine motor and problem solving, as well as internalizing behavior and externalizing behavior of children with different parents educational levels ( χ 2=14.37, 15.18, 21.10, 11.66, 9.27; 16.34, 26.75, 32.89, 16.97, 6.37, P <0.05). There were significant differences in the detection rates of suspected developmental delay in problem solving, prosocial behavior deficiency, internalizing behavior and externalizing behavior of children whose mothers had anxiety/depression symptoms during pregnancy ( χ 2= 5.61 , 9.05, 21.90, 7.17; 8.75, 6.06, 12.76 , 5.55, P <0.05). The average total screen time of boys was longer than that of girls (1.07, 1.00 h/d, Z=-2.08, P =0.04). Compared with children with other educational levels of their parents, the total screen time, mobile phone and TV screen time of children whose parents had college education or above were short (father: H =42.01, 44.49 , 21.24, mother: H =42.31, 39.21 , 26.47, P <0.01). Among all types of screen time, mobile phone screen time had the most impact on psychological and behavioral development. More mobile phone screen time increased the risk of suspected developmental delay and abnormal emotional behavior ( P < 0.05). Screen time of tablet, mobile phone and TV were positively correlated with externalizing behavior ( OR=1.36, 1.57, 1.27 , P <0.05). Conclusions Screen time is related to children s psychological and behavioral development problems and mobile phones affect the most. Parents should limit their children s screen time to avoid excessive screen time affecting their psychological and behavioral development.

Objective: To explore the influence of birth weight and growth patterns during infancy on overweight and obesity among first grade primary school pupils, so as to provide a theoretical basis for the formulation of early life prevention and intervention policies. Methods: In 2019, data related to routine physical examinations were collected for primary school pupils in the Minhang District of Shanghai, and information regarding birth and follow ups was collected retrospectively. Physical examination data of 4 434 pupils at 12 months of age were obtained. A multiple linear regression model was used to analyze the relationship between growth patterns during infancy and body mass index (BMI) in the first grade of primary school. A generalized linear model was employed to analyze the relationship between birth weight and growth patterns during infancy and overweight and obesity in the first grade of primary school. A hierarchical analysis was conducted. Results: A linear relationship was observed between growth patterns during infancy and BMI and the BMI Z score of first grade primary school pupils [ β(β 95%CI)=0.30(0.24-0.35),0.12(0.10- 0.15 ), P <0.01]. In addition to subjects classified as small for gestational age (SGA), catch up growth during infancy was identified among subjects who were classified as appropriate for gestational age (AGA) and large for gestational age (LGA). LGA at birth and catch up growth during infancy were independent risk factors for overweight and obesity among first grade primary school children ( RR =1.31-1.55, P <0.05). The hierarchical analysis showed that catch up growth increased the risk of overweight and obesity among first grade primary school pupils classified as AGA [ RR(RR 95%CI )=1.74(1.42-2.14),1.87(1.56-2.26)], and increased the risk of obesity among first grade primary school pupils classified as SGA and LGA [ RR(RR 95%CI )=3.74(1.04-13.49),3.24(1.62-6.46)]( P <0.05). Among those who exhibited catch up growth during infancy, LGA increased the risk of obesity among first grade primary school pupils ( RR= 2.60 , 95%CI=1.35-5.02, P <0.01), but not the risk of being overweight ( P =0.13). Conclusion Birth weight and growth patterns during infancy have an impact on overweight and obesity among children in the first grade of primary school. It is suggested that attention should be paid to growth and physical development in early life for those classified as LGA and AGA, and catch up growth in children should be closely monitored.

Objective To explore the role of protective function of Sestrin2(Sesn2)to mitochondria in alleviating cognitive dysfunction in mice with sepsis-associated encephalopathy(SAE).Methods 6-week-old male C57BL/6J mice were randomly divided into three groups:sham group,CLP group and CLP plus eupatilin group,40 mice in each group.A sepsis model was induced by cecal ligation and perforation(CLP).The CLP plus eupatilin group was treated with eupatilin.Neurobehavioral test and Morris water maze(MWM)were used to deter-mine neurobehavior and spatial learning and memory function in mice.The number of neurons in hippocampal CA1 area was counted by Nissl staining.HT22 cells were randomly divided into a control group(Con),lipopolysaccha-ride group(LPS),LPS plus eupatilin treatment group(LPS plus eupatilin)and LPS plus eupatilin and Nrf2 siRNA treatment group(LPS plus eupatilin and si-Nrf2).Apoptosis was analyzed by terminal deoxynucleotidyl transferase-mediated nick end labeling(TUNEL)staining,Mitochondrial membrane potential(MMP)was used to analyze mitochondrial damage.Results Seven days after CLP,as compared with sham mice,Sesn2 in hippocampus and cortex decreased significantly in CLP mice(P<0.01).As compared with CLP group,the survival rate in CLP plus eupatilin group increased significantly(P<0.05).As compared with sham group,the mice in CLP group showed a relatively high nerve injury score(P<0.05),and had fewer platform crossings and shorter target stay time,while the mice in CLP plus eupatilin group exhibited a lower injury score(P<0.05),and stayed in the target area for a longer time(P<0.05).As compared with sham group,the co-localization rate of neurons,Sesn2 and Nrf2 in CLP group decreased significantly(P<0.05),and the number of CD68/Iba-1 positive microglia increased significantly(P<0.05),while CLP plus eupatilin group reversed these changes.As compared with Con group,apoptosis and MMP level in LPS group increased significantly(P<0.01),while apoptosis and MMP level in LPS plus eupatilin group were lower than those in LPS group(P<0.05).However,Nrf2 knockdown(LPS plus eupatilin and si-Nrf2 group)reversed the anti-apoptosis and mitochondrial protection of eupatilin.Conclusions Eupatilin can alleviate cognitive dysfunction and neurological deficit in SAE mice by activating Sesn2-Nrf2 pathway,and improve inflammatory microenvironment by alleviating mitochondrial dysfunction.

Objective:To summarize the clinical features of children with pneumonia caused by coinfection of human adenovirus type 7 and Mycoplasma pneumoniae.Methods:A total of 36 children with pneumonia caused by coinfection of human adenovirus type 7 and Mycoplasma pneumoniae (coinfection group) diagnosed in the Wuhan Children′s Hospital from December 1, 2018 to September 1, 2019 were enrolled.Their clinical manifestations, laboratory examinations, and imaging findings were retrospectively analyzed.In the same period, 94 children with single human adenovirus type 7 infection pneumonia were selected as the single infection group.Differences between 2 groups were compared using the Student′s t-test, rank sum test and Chi- square test. Results:In the coinfection group, 25 cases were males, 11 cases were females, their mean age was 3.11 years.The main clinical manifestations included fever (97.2%) and cough (100.0%). The mean body temperature was 40.0 ℃, with the thermal peak of 4 times per day, and the mean course of fever of 11 days.The incidence of severe pneumonia was significantly higher in coinfection group (86.1%) than that of single infection group (69.1%) ( χ2=3.878, P<0.05). The common complications included myocardial damage (55.5%), heart failure (16.7%), liver function damage (25.0%), gastrointestinal bleeding (5.5%), toxic encephalopathy (11.0%), hemophagocytic syndrome (16.7%), and bronchiolitis obliterans (50.0%). The levels of cytokines like interleukin (IL)-6 [237.84(108.59, 606.36) ng/L], IL-10[31.44(12.13, 69.60) ng/L]and interferon-γ [(102.85±92.23) ng/L] were obviously elevated, and among them, IL-6 and IL-10 elevations were significantly pronounced in coinfection group than that of single infection group[148.35(57.43, 390.82); 19.67(10.96, 35.35)] ( Z=-1.984, -2.077, all P<0.05). Lung consolidation (50.0%) and pleural effusion (38.9%) were common in coinfection group, and the incidence of pleural effusion in coinfection group was significantly higher than that of single infection group (19.1%)( χ2=5.594, P<0.05). Conclusions:Most of the pneumonia caused by human adenovirus type 7 mixed Mycoplasma pneumoniae in children is severe pneumonia, which may be related to the cytokine storm.

INTRODUCTIONUnscheduled reattendances at the paediatric emergency department may contribute to overcrowding, which may increase financial burdens. The objectives of this study were to determine the rate of reattendances and characterise factors influencing these reattendances and hospital admission during the return visits.

METHODSMedical records of all patients who attended the emergency department at KK Women's and Children's Hospital, Singapore, from 1 June 2013 to 31 May 2014 were retrospectively reviewed. We collected data on patient demographics, attendance data and clinical characteristics. Planned reattendances, recalled cases, reattendances for unrelated complaints and patients who left without being seen were excluded. A multivariate analysis was conducted to determine the odds ratio of variables associated with hospital admission for reattendances.

RESULTSOf 162,566 children, 6,968 (4.3%) returned within 72 hours, and 2,925 (42.0% of reattendance group) were admitted on their return visits. Children more likely to reattend were under three years of age, Chinese, triaged as Priority 2 at the first visit, and were initially diagnosed with respiratory or gastrointestinal conditions. However, children more likely to be admitted on their return visits were over 12 years of age, Malay, had a higher triage acuity or were uptriaged, had the presence of a comorbidity, and were diagnosed with gastrointestinal conditions.

CONCLUSIONWe identified certain subgroups in the population who were more likely to be admitted if they reattended. These findings would help in implementing further research and directing strategies to reduce potentially avoidable reattendances and admissions.

Adolescent ; Asian Continental Ancestry Group ; Child ; Child, Preschool ; Electronic Health Records ; Emergency Medicine ; organization & administration ; Emergency Service, Hospital ; organization & administration ; Female ; Hospitals ; Humans ; Infant, Newborn ; Male ; Odds Ratio ; Patient Admission ; Patient Readmission ; Pediatrics ; organization & administration ; Singapore ; Triage ; methods