Objective: To evaluate the effects of expanded polytetrafluoroethylene (ePTFE) barrier membrane in guided periodontal tissue regeneration(GTR) . Methods:Nine patients with Ⅱ～Ⅲ furcation lesions were treated by guided tissue regeneration using ePTFE membrane. The membrane was retrieved 5 weeks after operation and examined by scanning electron microscopy (SEM) . Results:Large amount of lymphocytes were found on the external upper surfaces of ePTFE, with a little bacteria. The external lower surface of ePTFE was full of fibrocytes, red blood cells and lymphocytes.Conclusion:ePTFE membrane is biocompatible and can close the primary wound over a barrier which stops the downgrowth of junctional epithelium at the early stage of periodontal tissue repair after operation.

Objective: To evaluate the effects of guided tissue regeneration(GTR) in the treatment of degree Ⅱ-Ⅲ furcation defects with collagen membranes.Methods: 11 sites with Ⅱ-Ⅲ furcation defects were treated with collagen membranes(group of GTR); 10 sites received flap operation(group of FO). Clinical indexes, radiographs and gingival crevicular fluid(GCF) was collected before surgery and 3 months after treatment. Alkaline phosphatase(ALP) in GCF was measured. The data were analyzed statistically. Results: 3 months after surgery, the clinical parameters of PD, PFD and AL were decreased(P0.05). The decreace of the clinical parameters measured in group GTR was more than that in group FO(P

Objective:To evaluate the biocompatibility of insulin-like growth factor I (IGF-1) gene transfected bone marrow stem cells (MSCs) with ostrich true bone ceramic (OTBC). Methods:Rat MSCs were transfected with IGF-1 gene, and positive clones were selected by G418. The expression of IGF-1 protein in the MSCs was detected by immunocytochemical technique. The IGF-1 transfected MSCs were cultured with OTBC and the morphology of the cells was observed by scanning electronic microscope(SEM) at different time point. Results:Immunohistochemical staining suggested that the IGF-1 protein was expressed in the IGF-1 transfected MSCs. The cells adhered to OTBC and stretched well after 24 h of culture. The IGF-1 transfected MSCs proliferated on the surface of OTBC with culture time.Conclusion:The OTBC has a good biocompatibility with IGF-1 transfected MSCs.

Aim To investigate effects of 1,25-(OH)2D3 on the differentiation of MGC-803 cells.Methods MGC-803 cells were treated by 1,25-(OH)2D3(10-6、10-5、10-4 mmol?L-1),and the rate of growth suppression was evaluated by 3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyl tetrazolium bromide(MTT) assay.Plate clone formation assay was carried out to detect the phenotypes of colony formation.FACS analysis was used to analyze the cell cycle.The activity of telomerase was examined by telomeric repeat amplification protocol(TRAP) PCR-silver staining.Results 1,25-(OH)2D3 showed significant inhibitory effect on growth of these gastric carcinoma cells at 24,48,72 and 96 h.Treated with 1,25-(OH)2D3 for 48 h,cell cycle showed G0/G1 phase arrest,and the activity of telomerase was inhibited significantly.The colony-forming rate was reduced drastically(P

Objective To explore the expression of miR-146a and its target gene LIN52 in advanced gastric cancer and their potential impact on clinical prognosis.Methods Total RNAs were extracted from 93gastric cancer tissues and their corresponding adjacent non-tumor tissues to quantify the relative expression of miR-146a by using real-time quantitative PCR (RT-qPCR).Expression of LIN52 was detected in tumors and normal tissues by immunohistochemistry.Correlation analysis was assessed between the expression of miR-146a and LIN52 and clinicopathological parameters,including clinical diagnostic specificity,tumor TNM staging,lymph node metastasis,differentiation grade,curative effect and prognosis of gastric cancer.Results The expression of miR-146a in gastric carcinoma was negatively correlated with lymph node metastasis (P ＜0.05).The expression of miR-146a had a significant correlation with the prognosis of the patients (P ＜ 0.01).The patients with high expression of miR-146a had higher survival rate (P ＜ 0.05),but the patients with high expression of LIN52 had lower survival rate (P ＜ 0.05).The receiver operating characteristic curve regression analysis showed that sensitivity and specificity of miR-146a were 94.1％ and 61.5 ％ to diagnose gastric cancer.Conclusions As a tumor suppressor gene in gastric cancer,miR-146a has significantly negative correlation with LIN52.High expression of miR-146a in the gastric cancer tissue might be associated with improved treatment efficacy of chemotherapy,suggesting that miR-146a may be a molecular marker for the diagnosis and prognosis of gastric cancer.

Patients' safety is a hot topic of hospital management all over the word. Strengthening the patients' safety education for medical students and nursing students is an effective measure to protect patients' safety. In nursing school of Chongqing Medical University,patients' safety education was con-ducted through the course of undergraduate education. Contents of patients' safety education were com-bined with the professional courses,which are taught step by step in the professional course learning phase for different grades. Patients' safety education took a lot of teaching forms to cultivate the students' patient safety consciousness and preliminary results were achieved.

Human pluripotent stem cells provide an inexhaustible model to study human embryogenesis in vitro. Recent studies have provided diverse models to generate human blastoids by self-organization of different pluripotent stem cells or somatic reprogramming intermediates. However, whether blastoids can be generated from other cell types or whether they can recapitulate postimplantation development in vitro is unknown. Here, we develop a strategy to generate human blastoids from heterogeneous intermediates with epiblast, trophectoderm, and primitive endoderm signatures of the primed-to-naïve conversion process, which resemble natural blastocysts in morphological architecture, composition of cell lineages, transcriptome, and lineage differentiation potential. In addition, these blastoids reflect many features of human peri-implantation and pregastrulation development when further cultured in an in vitro 3D culture system. In summary, our study provides an alternative strategy to generate human blastoids and offers insights into human early embryogenesis by modeling peri- and postimplantation development in vitro.
Humans ; Pluripotent Stem Cells/metabolism* ; Embryo, Mammalian/metabolism* ; Cell Differentiation ; Blastocyst ; Cell Lineage ; Embryonic Development