Tissue engineering can regenerate damaged tissues and restore the biological functions by cell or tissue reconstruction,and is becoming a promising method for trachea replacement.Seed cells,cell growth factors and tracheal scaffolds are the three major elements of tissue engineering trachea,as a result researchers have paid a lot of attention to find ideal seed cells.Mesenchymal stem cells (MSCs) are a kind of stem cells with high self-renewal ability and muhi-directional differentiation potential.MSCs are widely distributed in bone marrow,umbilical cord,adipose tissue,myocardial tissue,brain,muscle and skin,and can differentiate into a variety of cells,including osteocytes,chondrocytes,adipocytes and neurocytes.MSCs have the characteristics of high proliferation ability,wide differentiation range and immunomodulatory function,which can be used to repair damaged tissue.These advantages make the MSCs an ideal candidate of seed cells for tissue engineering trachea.This review mainly summarized the application of MSCs in tissue engineering trachea.

Objective To prepare 3D printed tracheal graft and investigate its cellular biocompatibility and biomechanical properties.Methods Bone marrow was isolated from tibial plateau of young New Zealand white rabbit,and bone mesenchymal stem cells (BMSCs) were obtained by whole bone marrow culture method and adherent purification method.Biomechanical test was performed for 3D printed trachea graft.After co-cultured of 3D printed trachea graft and BMSCs,cell morphology was observed and the proliferation index of the cells on 3D printed trachea graft was quantified using sulforhodamine B (SRB) assay.Results 3D printed trachea graft showed excellent biomechanical properties.Cell morphology was normal and cells grew well after co-culture with 3D printed trachea graft.The SRB assay indicated good proliferation of BMSCs on 3D printed trachea graft.Conclusions 3D printed trachea graft shows favorable cellular biocompatibility and biomechanical properties,and therefore can be used as a scaffold material for tissue-engineered trachea.

Objective To investigate the inhibitory effect of the lentiviral vector (LV)-mediated RNA interference (RNAi) targeting HIF-1α on the expression of HIF-1α and Glut-1 in human pancreatic cancer Patu8988 cells.Methods The RNAi targeting HIF-1α was combined to LV,and transfected into Patu8988 cells.The Patu8988 cells transfected with the empty vector and exposed to 0.5％ O2 for 4 h served as hypoxia negative control,the Patu8988 cells not transfected with vector and exposed to 0.5％ O2 for 4 h as hypoxia blank control,and the Patu8988 cells transfected with LV-RNAi-HIF-1α and exposed to 0.5％O2 for 4 h as experimental group.The expression of HIF-1α was measured by RT-PCR and Western blot respectively.The expression of Glut-1 was measured by RT-PCR.Each group was compared according to oneway analysis of variance and two-sample t test.Results After transfection with LV-RNAi-HIF-1α,HIF-1α mRNA expression decreased by 65.1％ (0.209/0.321) and 80.6％ (0.791/0.982) (t=10.52,15.24,both P＜0.05) under normoxia and hypoxia conditions,meanwhile with the empty vector,HIF-1α mRNA expression decreased by 0.6％ (0.002/0.321) and 7.2％ (0.071/0.982) (t =5.26,7.38,both P＜0.05).Under hypoxia conditions,the protein of HIF-1α in experimental group cells (0.159±0.010) was down-regulated obviously compared to the negative control group (0.745± 0.012) and the blank control group (0.711 ± 0.023)(F=35.52,t =6.72,10.56,all P＜0.05).The expression of Glut-1 mRNA in experimental group cells (0.040±0.003) decreased obviously compared to the negative control group (0.054±0.003) and blank control group (0.062±0.004) (F=35.28,t=5.94,8.55,all P＜0.01).Conclusion Gene silencing of HIF-1α using LV-mediated RNAi can inhibit the expression of HIF-1α and decrease the expression of Glut-1mRNA in Patu8988 cells.

Type B aortic dissection is a life-threatening aortic disease.With the development of clinical classification and diagnostic method,the mortality of type B aortic dissection has been greatly decreased.In respect of treatment,endovascular repair due to minimally invasive advantages become the first choice for the treatment of complicated type B aortic dissection.For non-complicated type B aortic dissection,endovascular repair also gradually replace drug treatment,and showed good efficacy.Open surgery is only available for patients who ate not suitable for endovascular repair or repair failure or patients with connective tissue disease.

To obtain large quantity of human leukocyte antigen F (HLA-F) and cluster of differentiation 8alpha homodimers (CD8alphaalpha) proteins and to study their relationship, HLA-F and CD8alpha genes with rare codon in Escherichia coli were cloned using an N-terminal synonymous mutation method. High-efficiency expression protein inclusion bodies were acquired. The proteins were refolded using the dilution method and purified with gel-filtration and anion exchange chromatography. The results of gel-filtration and native-PAGE indicate that HLA-F interacts with CD8alphaalpha. This interaction may affect the binding between CD8alphaalpha and other MHC molecules to regulate immune responses. These results provide a basis for further research of HLA-F.
CD8 Antigens ; biosynthesis ; genetics ; Escherichia coli ; genetics ; metabolism ; Histocompatibility Antigens Class I ; biosynthesis ; genetics ; Humans ; Mutation ; Protein Interaction Domains and Motifs ; Protein Multimerization ; Recombinant Proteins ; biosynthesis ; genetics ; isolation & purification

Objective To improve the understanding of clinician' treatment of pregnancy with acute lymphoblastic leukemia. Method To analyze tretrospectively the diagnosis and treatment process of 1 case with acute lymphoblastic leukemia from December 13, 2016, and discuss the selection of the timing of termination of pregnancy. Results The patient was a 28 years old female. She was dignosed for acute lymphocytic leukemia in the third trimester. She bore a healthy baby boy in caesarean section after a dexamethasone treatment for two days. Then she recevied a series of standard chemotherapy. But she suffered a cerebral hemorrhage during treatment, and surgical pathology made a definite dignosis of central nervous system leukemia.Finally, She was out of danger after rescue. Conclusion Postoperative chemotherapy is a feasible option for the treatment of acute leukemia after the termination of pregnancy.

Objective To investigate the effects of age and gender on anti-oxidative,antiinflammatory and anti-apoptosis functions of high-density lipoprotein (HDL).Methods Totally 120 healthy subjects aged from 20 to 60 years were randomly divided into young and middle-aged male (n=60) group and female (n =60) group,and the 120 healthy elderly aged from 60 to 78 years divided into elderly male (n =60) and elderly female (n =60) groups.Serum levels of high-and low-density lipoprotein cholesterol (HDL-C,LDL-C),total cholesterol (TC),and triacylglycerol (TG) were detected.Content of malonaldehyde (MDA) was detected to determine anti-oxidative function of HDL.Adhesion assay of endothelial cells and monocytes (THP1) was adopted to test the protective effects of HDL on endothelial cells.The expressions of endothelial cell adhesion molecules,VCAM-1 and ICAM-1,were analyzed by Western blot.MTT and flow cytometry assays were used to detect the viability and apoptosis of the cells to test anti-apoptosis function of HDL.Results The levels of low-density lipoprotein,triglycerides and total cholesterol were higher in elder female group than in other three groups (all P＜0.05).The level of HDL-C was higher in young and middle-aged females than in other three groups(all P＜0.05).The level of MDA was higher in elder female group than in other three groups(all P＜0.05).The level of MDA was higher in elder male group than in the young and middle-aged male and female groups(all P＜0.05).After protection of HDL,the number of monocytes adhesion and expression levels of VCAM-1 and ICAM-1 were higher in elder groups than in young and middle-aged male and female groups(all P＜ 0.05).Relative survival and viability rates of endothelial cells were higher in young and middle-aged groups than in elder groups (all P＜0.05).Conclusions Ageing in both male and female induces impairments of anti-oxidative,anti-inflammatory and anti-apoptosis functions of HDL,with more evident decrease in anti-oxidative function in females.

In recent years,the incidence of lung cancer,high mortality,become one of the main diseases that threaten human health and life.Preoperative staging of non-small cell lung cancer,especially mediastinal lymph node staging is the key to determine whether surgery and judge tne prognosis of patients.Therefore,how to achieve accurate staging of mediastinal lymph node before surgery is a clinical problem to be solved urgently.The traditional methods of preoperative staging of mediastinal lymph nodes include imaging,minimally invasive biopsy and surgery.In recent years,the development of relevant serum tumor markers,serum miRNAs and clinical prediction models provide some new references for the preoperative diagnosis and assessment of mediastinal lymph node metastasis.This paper reviews the methods of preoperative diagnosis of mediastinal lymph node metastasis of non-small cell lung cancer in recent years,and summarizes and analyzes the advantages and disadvantages of various methods.

In recent years,the detection rate of early lung cancer with microscopic lesions such as ground-glass nodules and sub-centimeter nodules (≤ 1 cm) has been significantly higher.For such lesions,early surgical intervention can effectively prolong the survival time of patients.But in the actual operation of these small lesions difficult to detect,which brought great difficulties to surgery.At present,clinically for such small lesions,usually in the preoperative CT-guided puncture positioning based on the implementation of surgical resection.This method of location there are trauma,complications and other shortcomings,so how to more precise positioning and labeling of lung lesions is a clinical problem to be solved urgently.In this paper,the localization and localization of lung lesions in recent years are reviewed,and the advantages and disadvantages of various methods and materials are summarized and analyzed.