Objective To study the development of neural stem cells from human fetal brains at different developmental stages. Methods A total of 100 cases of embryos at 16-32 gestational weeks by induction of labor with water bag were collected for the determination of the distribution, forms, existing modes, and the number of neural stem cells in the hippocampus by SABC immunohistochemical method and light microscopy. Results Neural stem cells were found in the hippocampus at different fetal ages and located in the polymorphic layer, pyramidal, granular and molecular layers of hippocampus, mainly in polymorphic layer, pyramidal layer, and granular layer. Neural stem cells in hippocampus were round, ellipse, triangle, and stellate, particularly round and ellipse. No obvious enation was found. Neural stem cells had plenty of cytoplasm. The nuclei were round and ellipse with rare chromatin and nucleoli from 2 to 6. Most of neural stem cells were distributed among other neurons, and symmetric cleavage was found in some of them, but some neural stem cells were distributed in cluster and nest. The number of neural stem cells in hippocampus were different between groups and gradually decreased with the increasing gestational age. Conclusion Neural stem cells exist widely in the hippocampus at different gestational ages. There are differences in distribution, forms, existing modes, and number of neural stem cells in hippocampus at different gestational ages. Hippocampus may be the new originating region of neural stem cells.

Objective To investigate the characteristics of stem cells marked with bromode oxyuridine (Brdu) and telomerase reverse transcriptase (TERT) in lung tissue, as well as its effects on pulmonary development and injury-repair. Methods A model of hyperoxia in neonatal rats was established by exposed to 95% O2 for 7 days. Before executing rats, Brdu was injected peritoneally, then Brdu and TERT positive cells were detected by immunohistochemistry. Results (1)The positive staining cells of Brdu with large nuclear located in septa and submucose of series bronchia, scattering in epithelium of bronchia, and the number of positive cells were less. The positive staining cells of TERT located in the septa and alveolar walls of peripulmonary tissue and the number of which was less than that of Brdu. (2)The positive cells of SPC located in septa and alveolar walls. Staining with Brdu and TERT, small number of positive cells was observed. (3) In hyperoxia and normal oxygen group, integral of expression of Brdu, TRET and SPC had no differences. But integral of expression of Brdu in whatever hyperoxia (1. 61?0. 83) or normal oxygen group (1. 43?0. 85) were higher than TRET and SPC (P

Objective To study the effect of dexamethasone on KGF expression in lungs of neonatal rats after hyperoxic exposure. Methods A randomized controlled study was designed in 48 Sprague-Dawley neonatal rats of 3 days old and divided into hyperoxia group, hyperoxia + dexamethasone and control groups for 7days. Histologic examination of the lung tissues were studied and radical alveoli count (RAC) were determined after HE staining. KGF expression was detected by immunohistochemistry. Results (1)The lungs of the rats in the hyperoxia group showed thinner walls of alveoli, simple alveolar structure, fewer and larger alveoli, expanded and shrinked alveoli. While those rats in the dexamethasone group showed more severe changes and some destroyed septa and walls of alveoli which lead to structure turbulence of the pulmonary tissue. The RAC in the hyperoxia and dexamethasone group was siginificanly lower than that in the control group (9.50?1.05, 10.03?3.26 vs 13.00?1.79, P

Obgective To explore the risk factors of preterm infants with bronchopulmonary dysplasia(BPD).Methods A prospective cohort study was conducted to analyze the risk factors of preterm infants with BPD.Preterm infants (gestational age ＜ 32 weeks,and admission within 24 h since birth,and survival time more than 28 d since birth) who were sent to the Ward of Extremely Preterm Infants in Bayi Children's Hospital Affiliated to Clinical Medical College in Beijing Military General Hospital of Southern Medical University were enrolled from November 2013 to May 2014.According to the diagnostic criteria of BPD,the subjects were divided into 2 groups(BPD group and non-BPD group).Factors such as maternal information,neonatal basic information,neonatal diseases and treatments were compared between the 2 groups.Risk factors of preterm infants with BPD were analyzed by using t test,Chi-square test,Fisher's exact probability method and Logistic regression analysis.Results (1) A total of 298 cases were enrolled in this study.Among these infants,180 cases were male and 118 cases were female.The gestational age ranged from 25.6 to 31.9 weeks with the average age of (29.9 ± 1.4) weeks and the birth weights ranged from 740 to 2 300 g with the average weight of (1 428.3 ± 289.0) g.There were 19 cases of extremely low birth weight and 175 cases of very low birth weight.Sixty-nine cases of these infants were diagnosed as BPD (43 cases were mild,10 cases were moderate,16 cases were severe) with incidence of 23.2％.(2)The incidence of BPD was negatively related to gestational age and birth weight:the incidence of BPD in preterm infants with gestational age ＜ 28 weeks,28-30 weeks and ≥ 30-32 weeks were 70.4％,41.9％ and 6.2％;the incidence of BPD in preterm infants with birth weight ＜ 1 000 g,1 000-1 500 g and ≥ 1 500-1 800 g were 78.9％,29.5％ and 8.8％.(3) Multivariate Logistic regression found gestational age (OR =4.52),birth weight (OR =3.38),gender (OR =3.04),cytomegalovirus infection (OR =55.27),duration of invasive ventilation ≥ 7 d (OR =3.22),the highest concentration of inspired oxygen ≥400 mL/L (OR =4.14),patent ductus arteriosus(PDA) in need of surgical ligation (OR =7.30),and transfusion of packed red blood cells within 14 d since birth (OR =3.51) were the independent risk factors of BPD (all P ＜ 0.05).(4) Factors such as birth weight (P =0.015),duration of invasive ventilation (P =0.003),duration of inspired oxygen (P =0.000),and PDA in need of surgical ligation or not(P =0.017) were related to the severity of BPD.Conclusions BPD is a multifactorial disease.Taking effective measures to control risk factors is the key for preventing BPD.

Objective To evaluate the efficacy of haploidentical hematopoietic stem cell transplantation (HSCT) with supplemental umbilical cord blood (UCB) infusion in treatment of malignant hematological diseases.Method Clinical data of 66 patients with hematological malignancies treated with HSCT in our hospital between January 2010 and May 2013,were retrospectively analyzed.Among them 25 cases received infusion of human UCB before HSCT (experimental group) and other 41 cases had no UCB injection before HSCT (control group).Results There were no differences in age,gender,donor type,disease categories,disease status before transplant between two groups (P ＞ 0.05).There was a significant difference in conditioning regimes between two groups (P ＜ 0.05),but no clinical implication.The infused mononuclear cell (MNC) count in experimental group was higher than that in control group (9.94 ± 2.88 × 108/kg vs.7.80 ±0.82 × 108/kg,P =0.00),while there were no difference in infused CD34 + cell count (5.46 ±3.54 × 106/kg vs.3.54 ± 1.60 × 106/kg,P =0.16).Neutrophil recovery time in experimental group was shorter than that in control group (13.7 ±2.9 d vs.16.6 ±2.9 d,P =0.023).The incidences of grade Ⅲ-Ⅳ acute graft versus host disease (aGVHD,P =0.036),bacterial infection (P =0.001) and fungal infection (P =0.001)and hemorrhagic cystitis (P =0.00)in experimental group were lower than those in control group.There were no significant differences in platelet recovery time(P =0.43),the incidence of grade Ⅰ-Ⅱ aGVHD (P =0.27),implanted syndrome (P =0.24),sinusoidal obstruction syndrome (P =0.57)and viraemia (P =0.31)between two groups.Conclusion HSCT with supplemental infusion of human UCB may alleviate the degree of aGVHD,but the long-term outcome remains to be studied.

OBJECTIVE: ABO genotyping for forensic identification by oligonucleotide chip. METHODS: Oligonucleotide microarrays which could detect 3 different SNPs in exon 6 and exon 7 for ABO genotyping were used. Population studies on ABO was carried out in a sample of 115 unrelated Chinese Han individuals. The method was also applied to cases. RESULTS: The technique could identify 6 genotypes of ABO system. According to the results of population studies, no significant deviations from Hardy-Weinberg equilibrium could be found. The observed and expected heterozygosities were 0.591 and 0.616 respectively. The polymorphic information content was 0.544. The average exclusion probabilities in buos and trios was 0.188 and 0.344 respectively. The discrimination power is 0.777. CONCLUSION The data and case application demonstrated that ABO typing by oligonucleotide probe arrays was a useful technique for paternity testing and individual identification.
ABO Blood-Group System/genetics* ; Blood Stains ; DNA/blood* ; DNA Primers ; Female ; Forensic Medicine ; Genotype ; Hair/chemistry* ; Humans ; Oligonucleotide Array Sequence Analysis