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Beijing, China

Yang L.,Beijing Institute of Radiation Medicine | Wang R.,Bayi Childrens Hospital | Gao Y.,Beijing Institute of Radiation Medicine | Xu X.,Beijing Institute of Radiation Medicine | And 4 more authors.
Digestive Diseases and Sciences | Year: 2014

Background: Neutron irradiation (IR) has been proven to cause more serious damage than gamma IR. Preventing and curing neutron IR damage remains an urgent issue. Aims: The objective of this study was to investigate the radioprotective effects of IL-11 against neutron IR-induced damage in small intestine of mice. Methods: Mice were exposed to 3-Gy neutron IR whole body and then treated with 500 μg/kg interleukin-11 (IL-11) intraperitoneally every day. Mice were observed at various time-points over 1-5 days after IR. IEC-6 cells were exposed to 4 Gy neutron IR, and 100 ng/mL rhIL-11 was added to culture medium. Cell proliferation activity was estimated by MTT assay and rates of apoptosis were estimated by flow cytometry. Results: IL-11 slightly alleviated the incidence of diarrhea in the mice and promoted intestinal epithelia regeneration. In the in vitro study, neutron IR activated extracellular signal-regulated kinase (ERK)1/2 phosphorylation in intestinal epithelial cells constitutively, which was initially suppressed and then activated later by IL-11. The MEK-specific inhibitor U0126 could antagonize the positive effect of IL-11 on cell growth. Phosphatidylinositol 3-kinase (PI3K)/Akt pathway activation was suppressed after neutron IR, but could be triggered by IL-11 to protect the cells. The PI3K inhibitor LY294002 suppressed the positive effect of IL-11 on cell growth, and antagonized the protective effect of IL-11 against cell death after neutron IR. Conclusion: IL-11 increases cell proliferation after neutron IR in MEK and PI3K-dependent signaling pathways, but protects cells against death only in the PI3K-dependent signaling pathway. © 2014 Springer Science+Business Media. Source


Liu J.,Bayi Childrens Hospital | Feng Z.-C.,Bayi Childrens Hospital | Li J.,Capital Medical University | Wang Q.,Capital Medical University
Journal of Maternal-Fetal and Neonatal Medicine | Year: 2012

Objective: Antenatal corticosteroids are extensively given in pregnancies with threatened preterm labour as a prophylactic method to reduce some kinds of neonatal diseases. Dexamethasone is one kind of commonly used corticosteroid, but controversies still remain whether it leads to adverse effects on neonatal long-term development or not. The purpose of this study was to investigate the influence of prenatal exposure to one or two dosages of dexamethasone on neonatal physical and cognitive development of children at 1, 3 and 6 years of age. Methods: This was a retrospective cohort study. The body length, head circumference and body weight were measured in every infant and child to evaluate physical development. The mental development index (MDI) and a psychomotor development index (PDI) were used to evaluate mental and cognitive development in children of ages 1 year and 3 years while verbal intelligence quotient (VIQ) and performance intelligence quotient (PIQ) scores were used to evaluate mental and cognitive development in children of age of 6 years. There were 1554 infants at 1 year, 1328 children at 3 years and 1297 preschool children at 6 years followed. Results: There were no significant differences between antenatal dexamethasone exposure groups and antenatal dexamethasone non-exposure groups on physical development index and MDI, PDI, VIQ and PIQ. Conclusions: The results of this investigation suggested that one or two dosages of antenatal dexamethasone is safe for the use of inevitable preterm birth. © 2012 Informa UK, Ltd. Source


Liu J.,Bayi Childrens Hospital | Liu Y.,Bayi Childrens Hospital | Wang X.-F.,Bayi Childrens Hospital | Chen H.,Capital Medical University | Yang N.,Bayi Childrens Hospital
Nutritional Neuroscience | Year: 2013

Objective: This study seeks to explore whether antenatal supplement of taurine may improve the brain development of fetal rats with intrauterine growth restriction (IUGR) via the protein kinase A-cyclic adenosine monophosphate (cAMP) response element protein (PKA-CREB) pathway. Methods: Fifteen pregnant rats were randomly divided into control group, IUGR model, and IUGR with antenatal taurine supplement group. Brain tissues were obtained immediately after rats were born. PKACREB signal pathway activity and glial cell line-derived neurotrophic factor (GDNF) mRNA and protein levels were measured by reverse transcription polymerase chain reaction and immunohistochemistry stains, whereas immunoreactive cells of neuron-specific enolase (NSE) and proliferating cell nuclear antigen (PCNA) were detected by immunohistochemistry stains. Results: The results showed that: (1) In the IUGR group, a greater number of PCNA and NSE immunoreactive cells were found in brain tissues compared with controls, and prenatal taurine supplementation led to a further increase. (2) Expression of PKA, CREB, and GDNF were increased in mRNA and protein levels due to taurine supplementation. Discussion: Antenatal taurine supplementation shows effects of promotion of cell proliferation and activation of neurotrophic factors on fetal rat brain in a model of IUGR by activating the PKA-CREB signal pathway, increasing expression of neurotrophic factors, and promoting cell proliferation to counteract neuron loss caused by IUGR. © W. S. Maney & Son Ltd 2013. Source


Zhou H.,Bayi Childrens Hospital | Sun N.,Capital Medical University | Zhang X.,China PLA General Hospital | Xie H.,Bayi Childrens Hospital | And 4 more authors.
Pediatric Surgery International | Year: 2012

Background: Scar-free abdominal wall surgery is a research hotspot in recent years. This study presented surgical skills of transumbilical laparoendoscopic singlesite pyeloplasty (LESS-P) for pediatric patients with ureteropelvic junction obstruction (UPJO) and its clinical application. Methods: Twenty-four pediatric patients with UPJO had transumbilical LESS-P performed by the same surgeon from June to December 2010. Among them, 16 were males and 8 females aged from 2 to 62 months with average of 14 months. Eighteen patients had obstruction on the left ureteropelvic junction and six on the right. The renal pelvis and ureter were anastomosed using 5-0 absorbable sutures and a double-J ureteric stent was placed through the anastomotic stoma. Results: All operations were successful. None was converted to open surgery and no additional sheath tube or incision besides umbilicus was needed. No intraoperative complications occurred. Ectopic blood vessels were found in two cases during surgery. The mean operative time was 145 min, and the average blood loss about 10 ml. Abdominal drainage tubes were remained for 2-9 days after surgery. The mean postoperative hospital time was 7 days. Two patients had postoperative urinary fistula, which naturally disappeared at 4 and 7 days of postoperation, respectively. Ultrasound and diuretic renal scintigraphy in follow-up found 23 patients had significantly decreased renal pelvis diameter. Although the other one showed no obvious change, but diuretic renography showed significantly improved excretion as indicated by increased glomerular filtration rate from 29 ml/min before surgery to 46 ml/min 6 months after surgery. Conclusion: Pediatric transumbilical LESS-P is not only safe and effective but also can well meet patient's aesthetic desire for scar-free abdominal wall. © Springer-Verlag 2011. Source


Wang Y.,Bayi Childrens Hospital | Zhang X.-A.,Beijing Institute of Microbiology and Epidemiology | Yang X.,Bayi Childrens Hospital | Yang X.,Shanghai University | And 2 more authors.
Molecular Genetics and Genomics | Year: 2014

Monocyte chemoattractant protein-1 (MCP-1) is an important chemokine involved in the pathogenesis of spontaneous preterm birth (SPTB). We examined whether the MCP-1 G-2518A polymorphism is associated with the risk of SPTB in a Chinese population. The MCP-1 G-2518A polymorphism was genotyped in 569 preterm singleton neonates and in 673 term neonates using polymerase chain reaction–restriction fragment length polymorphism analysis. The distribution of the MCP-1 G-2518A genotype and the allele frequencies between the SPTB patients and the controls were not significantly different in the overall sample. However, we found that the AA genotype was associated with significantly increased susceptibility to very SPTB (<32 weeks) [odds ratio (OR) 2.07; 95 % confidence interval (CI), 1.27–3.36; P = 0.005) and extremely SPTB (<28 weeks) (OR 2.74; 95 % CI, 1.10–6.72; P = 0.014) compared with −2518G-positive genotypes (GG + GA genotypes). When extremely preterm neonates and very preterm neonates were combined, the AA genotype was also significantly associated with increased susceptibility to SPTB (OR 2.23; 95 % CI, 1.40–3.54; P < 0.001). The MCP-1 G-2518A polymorphism was not associated with increased susceptibility to SPTB in patients with premature rupture of the membranes (PROM) or in those without PROM. Our findings suggest that the MCP-1 G-2518A polymorphism may plays a role in mediating the susceptibility to SPTB in the Chinese population. Knowledge of genetic factors contributing to the pathogenesis of SPTB may have implications for screening and treatment of this disorder. © 2014, Springer-Verlag Berlin Heidelberg. Source

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