BACKGROUND:The rise of tissue engineering has opened up new ways for tissue repair and reconstruction of the urinary tract, and the bladder acellular matrix is a better alternative material for urinary tissue engineering.
OBJECTIVE:To construct the compound of hair fol icle stem cells with heterologous bladder acellular scaffold, and to observe the growth of hair fol icle stem cells on the scaffold.
METHODS:Bladder acellular matrix from New Zealand rabbits were prepared and detected using scanning electron microscopy and Masson staining. Passage 3 hair fol icle stem cells were statical y inoculated into the surface of bladder acellular matrix using secondary sedimentation method. Under inverted microscope, cellgrowth was observed, and cellgrowth curves were drawn. cellgrowth on the scaffold surface was observed through histological detection and scanning electron microscope observation.
RESULTS AND CONCLUSION:Prepared bladder acellular matrix was a white translucent film with fiber mesh structure, and no residual cells were seen. Masson staining results indicated that the bladder acellular matrix had col agen structure, and no obvious residual cells. After culture for 48 hours, hair fol icle stem cells grew wel around the bladder acellular matrix under inverted microscope;1 week later, hair fol icle stem cells extended and adhered to the scaffold surface. These findings indicate that hair fol icle stem cells have a good biocompatibility with the bladder acellular matrix through in vitro culture.

Objective: To explore value of 6-minute walking in rehabilitation therapy of patients with chronic heart failure (CHF). Methods: A total of 78 CHF patients were selected from department of geriatrics of our hospital. They were randomly and equally divided into 6min walking test (6MWT) group (received 6-min walking training based on routine treatment, twice/d) and routine treatment group. After six weeks, 6min walking distance (6MWD), heart rate and left ventricular ejection fraction (LVEF) were compared between two groups before and after treatment. Results: After six weeks, there were significant improvements in related indexes in both groups, P<0.05 all; compared with routine treatment group, there were significant increase in 6MWD [(307.6±39.3) m vs. (503.4±44.4) m] and LVEF [(45.3±17.9) % vs. (58.7±19.2) %], and significant decrease in heart rate of recovery period after 6MWT [(73.3±2.9) times/min vs. (65.7±2.1) times/min] in 6MWT group, P<0.05 all. Conclusion: Six-minute walking can significantly improve symptoms of heart failure and enhance exercise tolerance, and it possesses important value for recovery of heart function in these patients.

Objective To study the compatibility and feasibility of construct tissue engineer bladder through biocompatibility of hair follicle stem cells (HFSCs) and heterogeneous bladder acellular matrix (BAM) in vitro and vivo.Methods The third-generation of rat HFSCs were cultured with the two-step enzymatic and different adhesion time method.The cells were identified by flow cytometry through detection expression of β1 integrin FITC-Conjugated.The New Zealand rabbit BAM were decellularized by the method of microdissection and chemical washing,and then examined by Masson staing and electron microscope to confirm no cell elements remained.The HFSCs of the rats were implanted in BAM and cultured for about 24 hours.Then the cells growth conditions on the material surface were examined by histology and scanning electron microscopy.The cells-scaffold composites were implanted in rats subcutaneously,samples and histological examination were harvested at 1,2 and 4 weeks after implantation.Results The BAM was white and translucent membranous.There were fiber network structures without cell elements remained under the examination of electron microscope.And the BAM prompted for collagen tissue composition under Masson staining,without significant residual cells.The growth condition of HFSCs beside the BAM was well that observed by inverted microscope at 48 h of co-culture.After 1 week the HFSCs extended and adhered to the matrix surface observed under the scanning electron microscope.No significant inflammatory response in rat subcutaneous implantation experiments,the single-layer cell structure in histological examination could be seen after 1 week,and multi-layer cell structure in histological examination could be seen after 4 weeks of implantation.Conclusion The biocompatibility of HFSCs and heterogeneous BAM is good,which provides a good experiment support for HFSCs to repair the bladder defects disease.

In order to meet the demand of higher medical education reform and to enhance the re-search capability among medical undergraduates , Capital Medical University carried out a project named undergraduate scientific research and innovation program. In the process of the project , several problems were found in both undergraduates and tutors including lack of document indexing skill , professional English ability , doctor-patient communication consciousness , data statistics and paper writing skills of undergraduates and limited time, insufficient funds and lacking experiences of tutors. Through establish-ing sound and standard training system, increasing scientific research funding, setting up incentive mech-anism and increasing scientific research ability training courses, scientific research ability of undergradu-ates and tutors were firmly strengthened.

Objective To explore the expression, as well as the proportion of subsets of the natural killer (NK) T cells in peripheral blood of patients with esophageal carcinoma before and after surgery, and provide ideas and experimental basis for immune treatment through tests. Methods Using CD3, CD56, CD4 and CD8 antibody to study the NKT cells and its subsets. Peripheral NKT cell subsets in 59 patients with esophageal carcinoma were analysed by flow cytometer. Results With the ratio of CD+3 CD+56 CD+8/CD+3 CD+56 CD+4 gradually increased, the proportion of phase Ⅲ- Ⅳ patients with esophageal carcinoma is gradually decreased between the groups. One-way ANOVA analysis showed that there were differences between the groups (P ＜0.05). The ratio of CD+3 CD+56 CD+8/CD+3 CD+56 CD+4 was in Non-linear related to CD+3 CD+56 CD+4NKT cells; CD+3 CD+56 CD+8; NKT cells were positively correlated with CD-3 CD+56 NK cells and negatively correlated with CD+3 T cells.Conclusion The ratio of CD+3 CD+56 CD+8/CD+3 CD+56 CD+4 may relate to tumor burden, and is helpful to determine the extent of disease in patients with esophageal carcinoma and prognosis.

Objective To investigate the relationship between 4G/5G polymorphism in the promotor of plasminogen activator inhibitor-1 (PAI-1) gene and pulmonary thromboembolism (PTE). And to detect whether it plays an important role in the pathogenesis of PTE. Methods The 76 patients with PTE, 74 gender and age matched healthy controls were recruited in this study. Genome DNA was extracted from whole blood using phenol-chloroform. Subjects were genotyped for the 4G/ 5G polymorphism of PAI-1 gene using polymerase chain reaction and restriction fragment length polymorphism analysis. Results Significant difference was found in the frequency of 4G/4G genotype between PTE group and control group (50.0% vs.24.3%,P<0.01). And there were no significant differences in 4G/5G and 5G/5G genotype between the two groups. The 4G allele frequency was higher in PTE group than in control group (72.4% vs. 55.4% , P<0.01) . The recessive allele model was informative and the odd ratio of 4G/4G genotype was much higher than of other two genotypes (OR=3.40, P<0.01). Further stratification showed 4G/4G genotype was associated with high risk of PTE for those individuals without traditional environment risk factors. Conclusions The 4G/5G polymorphism of PAI-1 gene is associated with PTE and 4G allele is recessive. 4G/4G genotype increases the risk of PTE for individuals who have no traditional risk factors of PTE.

Our previous studies demonstrated that CD151 gene promoted neovascularization in ischemic heart model. To improve the delivery efficacy and target specificity of CD151 gene to ischemic heart, we generated an adeno-associated virus (AAV) vector in which CD151 expression was controlled by the myosin light chain (MLC-2v) promoter to achieve the cardiac-specific expression of CD151 gene in ischemic myocardium and to limit unwanted CD151 expression in extracardiac organs. The function of this vector was examined in rat ischemic myocardium model. The protein expression of CD151 in the ischemic myocardium areas, liver and kidney was confirmed by using Western blot, while the microvessels within ischemic myocardium areas were detected by using immunohistochemistry. The results showed that MLC-2v significantly enhanced the expression of CD151 in ischemic myocardium, but attenuated its expression in other organs. The forced CD151 expression could increase the number of microvessels in the ischemic myocardium. This study demonstrates the AAV-mediated and MLC-2v regulated CD151 gene is highly expressed in the ischemic myocardium and cardiac-specific delivery that is more efficiently targets CD151 to the ischemia myocardium after myocardial infarction.

Objective To analyze the succumbed reasons of emergent pereutaneous coronary intervention(EPCI)in treatment of acute myocardial infarction(AMI)during operation and in-hospital period.Method During March 1999 to June 2005,623 AMI patients received EPCI,and 27 patients died.The succumbed reasons and clinical characteristics of the succumbed patients were analyzed.Result Among the 27 succumbed patients,with age 51 to 91(69?18)years old, 16 had three-vessel lesions.10 had two-vessel lesions and l had single vessel lesion.Ten patients were accompanied with old myocardial infarction,9 with diabetes meUitus,19 with hypertensions,4 with impaired renal functions,and 6 with old cerebral infarction.Nine patients died of eardingenic shocks,6 died of no-reflows,2 died of heart ruptures,2 thrombosis, 2 acute left heart failure,2 acute renal failure,2 intracranial hemorrhage,l shock due to hemorrhage of puncture position, and l acute perieardiae tamponade.Conclusion The succumbed reasons of EPCI in treatment of acute myocardial infarction were various.Cardiac shock and no-reflow were primary reasons.Old age,multi-vessel lesion,diabetes mellitus, and old myocardial infarction may serve as predicting factors.

Objective To elucidate the expression of gankyrin in human gastric cancer cells and it's role in nimesulide induced apoptosis. Methods Four human gastric cancer cell lines including MKN28 (well differentiated), AGS (poorly differentiated), MKN45 (poorly differentiated), and SGC7901(moderately differentiated) were cultured and treated with nimesulide. Nimesulide induced growth inhibition and apoptosis of the cells were detected by methyl thiazolyl tetrazolium assay, and confirmed by flow cytometry. The expressions of gankyrin gene and protein were further assessed by real-time PCR and Western blotting. Results Gankyrin mRNA and protein were detected in all four human gastric cancer cell lines. The proliferations of AGS and SGC7901 cell lines were significantly suppressed by nimesulide in a time-dose dependent manner. When treated with 400 μmol/L of nimesulide for 48 hours, the significant apoptosis was found in AGS cells (23.30%±2.50%) and SGC7901 cells (16.80%±1.55% ) in comparison with controls (0.57%±0.19% and 0.88%± 0.17%, respectively, all P values <0.01). Apoptosis of AGS cells induced by nimesulide was accompanied by a considerably decreased gankyrin expression that was more significant at 24 hours (0.0035±0.0014) and 36 hours (0.0980±0.0160) in comparison with controls (0.4690±0.1190, all P values<0.01). Conclusion Gankyrin expresses in human gastric cancer cell lines and may be involved in nimesulide induced apoptosis of AGS cells.

Objective To evaluate the effects of sinomenine on the expression of hypoxia-inducible factor-1α (HIF-1α) and vascular endothelial growth factor (VEGF) during renal ischemia-reperfusion (I/ R) in rats.Methods Fifty-four male Wistar rats, weighing 180-220 g, were randomly divided into 3 groups (n=18 each) using a random number table: sham operation group (group S) , group I/R and sinomenine group (group SIN).Renal I/R was induced by clamping the left renal pedicle for 45 min followed by reperfusion in I/R and SIN groups.In group S, the bilateral renal pedicels were only exposed.Sinomenine 60 mg/kg was intraperitoneally injected at 30 min before reperfusion in group SIN, while the equal volume of normal saline was given in group S and group I/R.At 6, 12 and 24 h (T1-3) of reperfusion, 6 rats from each group were chosen, and blood samples were drawn from the hearts for determination of the serum creatinine (Cr) and blood urea nitrogen (BUN) concentrations.The animals were then sacrificed, and the left kidney was removed and embedded into a paraffin block for determination of the expression of HIF-1α and VEGF in the renal tissues (by immuno-histochemistry).Results Compared with group S, the serum Cr and BUN concentrations were significantly increased at T1-3 , and the expression of HIF-1α was significantly up-regulated at T2,3 in group I/R and group SIN, and the expression of VEGF was significantly upregulated at T2,3in group I/R, and at T1-3 in group SIN.Compared with group I/R, the serum Cr concentration at T1-3 and serum BUN concentration at T2,3 were significantly decreased and the expression of HIF-1α at T2,3and VEGF at T1-3was significantly up-regulated in group SIN.Conclusion The mechanism by which sinomenine attenuates renal I/R injury is related to up-regulation of the expression of HIF-1α and VEGF in the renal tissues of rats.