The maspin gene,a tumor suppressor gene and a member of the serpin superfamily,is isolated from mammary epithelial cells.Maspin gene plays an important role in the process of invasion and metastasis of gastric cancer.Researches show that maspin gene suppresses the occurrence,development and metastasis of gastric cancer mainly by inducing tumor cell apoptosis,inhibiting tumor angiogenesis,methylation modification,promoting homogeneity adhesion and inhibiting heterogeneous adhesion.

Objective To explore the influence of abnormal mechanical stress on acetabular development, especially on the chondrocyte proliferation in acetabular growth plate, and to research the methods of the repair of acetabular dysplasia. Methods 60 Wistar rats of 3 weeks old were divided into three groups, and each group had twenty rats. The left side was experimental side, and the right side was control. In group A, the hip joint was dislocated by manipulation repeatedly within two weeks; in group B, the model of acetabular dysplasia was created by keeping the knee joint in extension through steel needle fixation. The needle was removed after two weeks of fixation; and in group C, the knee joint was fixed in continuous extension with steel needle. When at 5, 7, 9 and 12 weeks old, the rat acetabulum was observed through the soft X-ray photograph, histological method and electronic micrograph respectively. Results In group A, when the rat was 5 weeks old, the acetabular angle was larger roughly 5? than the control side. Malalignment of chondrocyte column in proliferative zone was observed. No difference was seen between the two sides at 7, 9 and 12 weeks old. In group B, when the rats was 5 weeks old, the acetabular angle increased compared to the control side. When the rat was 7 weeks old, malalignment of the chondrocyte column in proliferative and hypertrophic zone increased. When at 9 and 12 weeks old, histological changes became indistinct gradually. In group C, the acetabular angle kept increasing to the control side. The acetabular dysplasia became obvious and had no improving tendency. When the rat was 12 weeks old, the acetabular edge became adducting and flat. There was no obvious alignment of chondrocyte column. The nucleus of acetabular chondrocyte of the proliferative zone became smaller, endoplasmic reticulum and mitochondria decreased, and bubbles formed. Conclusion Acetabular dysplasia could recover when abnormal mechanical stress was released, and the congruence of the head and acetabulum were corrected in the highly growing period of acetabulum. The crucial reason to acetabular dysplasia is the metabolic changes of chondrocytes in proliferative zone of growth plate, which leads to tardy ossification of the acetabulum.

Objective To investigate the molecular mechanism of the glucocorticoid?induced osteoblasts apoptosis,and to develop the effective intervention measures. Methods The MC3T3?E1 cells were treated with different concentrations of dexamethasone for 24 hours,then the apoptosis rate was detected with TUNEL analysis,the intracellular expression of Bim and Bax were determined by Westen blot. In addition,MC3T3?E1 cells were randomly divided into Bim?siRNA group,negative control siRNA group and control group. Twenty?four hours after transfection,10-4mmol/L dexamethasone was added to each group of cells for another 24 hours administration. The apoptosis rate was analyzed using the TUNEL,the mito?chondrial transmembrane electric potential was detected by flow cytometry after JC?1 staining,the expression of Bax,Bcl?2 in mitochondrial and Cyt?C,AIF in cytosolic were determined by Western blot. Results The rate of osteoblast apoptosis and Bim expression in cells were both significantly in?creased with the dosage of dexamethasone,there was no significant difference between the groups in the expression of Bax;the rate of osteoblast apop?tosis after the expression of silence Bim was significantly lower than the negative control siRNA group and control group,the expression of Bax and Cyt?C,AIF in cytosolic were significantly reduced,and the mitochondrial transmembrane electric potential was increased. Conclusion Bim is the key molecules in hormone?induced apoptosis of osteoblasts ,the expression of silence Bim can inhibit dexamethasone induced osteoblasts apoptosis through the mitochondrial pathway.

BACKGROUND: Present studies have proved that titanium coating nanotubes cannot only promote the biological activity of the material itself, but also be used as a drug carrier loading antibiotics and growth factors. OBJECTIVE: To investigate the antibacterial properties of vancomycin/hydroxyapatite/titanium dioxide nanotubes in vitro and in vivo. METHODS: The releasing property in vitro of vancomycin/hydroxyapatite/titanium dioxide nanotubes and vancomycin/titanium dioxide nanotubes were detected. And 1010/L Staphylococcus aureus dilution was put onto the commercial titanium, titanium dioxide nanotube and vancomycin/hydroxyapatite/titanium dioxide nanotube, respectively. Twenty-four hours later, the bacterial growth and activity was observed by scanning electron microscope and confocus scanning electron microscope, respectively. RESULTS AND CONCLUSION: Scanning electron microscope showed: the number of Staphylococcus aureus was the least on the vancomycin/hydroxyapatite/titanium dioxide nanotube, and the bacterial morphology was destroyed. Confocus scanning electron microscope observed: the number of bacteria and viable bacteria was the least on the vancomycin/hydroxyapatite/titanium dioxide nanotube, and the most on the commercial titanium. Besides, the releasing time of vancomycin from the hydroxyapatite/titaniumdioxide nanotube was up to 18 days, but the releasing time of vancomycin was only 4 hours from the titanium dioxide nanotube. In conclusion, the vancomycin/hydroxyapatite/titanium dioxide nanotube has good antibacterial property and slow-releasing performance.

Objective To investigate the clinical features , treatment regimen , and prognosis evaluation of tertiary peritonitis (TP). Methods Seventy-eight cases with TP were randomly enrolled into 2 groups, including the simple western medicine-treated group (32 cases) and the integrated traditional Chinese and western medicine-treated group (46 cases). The prognoses were evaluated according to the acute physiology and chronic health evaluationⅢ (APACHEⅢ, APⅢ) scoring. Results The mortality rate was 71.9% (23 of 32) in patients received the simple western medicine and was 32.6%(15 of 46) in patients received the integrated traditional Chinese and western medicine with significant difference between these two groups (P < 0.01). There was a significant correlation between AP Ⅲscore and actual mortality (r=0.73,P<0.01), and predicted mortality (r=0.76, P<0.01). Conclusions The therapeutic effect is acceptable and satisfactory for the TP patients received the integrated traditional Chinese and western medicine. The AP Ⅲ scoring system can be used to predict the prognosis of TP patients.

BACKGROUND:In order to overcome the shortcomings of single materials, antibiotics-loaded hydroxyapatite/titanium composites have attracted people’s attentions.
OBJECTIVE:To evaluate the biocompatibility of vancomycin/hydroxyapatite/titanium nanotubes.
METHODS:Mouse osteoblasts, MC-3T3-E1, were co-cultured with titanium (Cp-T), TiO2nanotubes, and vancomycin/hydroxyapatite/titanium nanotubes, respectively. Cel morphology and growth were observed after 1, 3 and 5 days of co-culture under inverted microscope and scanning electron microscope. The cel proliferation was detected by AO-EB method. The total protein, calcium and alkaline phosphatase levels were detected at 7 and 14 days of co-culture.
RESULTSAND CONCLUSION:The MC-3T3-E1 cels with good viability and morphology adhered wel on the surface of vancomycin/hydroxyapatite/titanium nanotubes compared with those on the surface of pure titanium and TiO2nanotubes under the scanning electron miscroscope. Moreover, there were a large amount of pseudopodia on the surface of composite nanotubes. Compared with the other two groups, the cel number on the surface and the levels of intracelular calcium and alkaline phosphatase were al higher in the vancomycin/hydroxyapatite/titanium nanotubes group. These findings suggest that the vancomycin/hydroxyapatite/titanium nanotubes have good biocompatibility and no cytotoxicity.

Objective To investigate the effects of retrograde cardioplegia on serum soluble inter cellular adhesion molecule (sICAM)-1,soluble P-selectin (sPs) and cardiac troponin Ⅰ(cTnI) in the process of heart valve replacement operation.Methods Fifty-six cases undergoing heart valve replacement with cardiopulmonary bypass (CPB) were divided into antegrade cardioplegia (AC) group and retrograde cardioplegia (RC) group.Serum levels of sICAM-1,sPs and cTnI were measured using enzyme-linked immunosorbent assayd (ELISA) at six times.Results After the CPB,the levels of sICAM-1,sPs and cTnI ascended quickly,at the time of 8-hour after operation achieved the peak value.The peak value of RC group were lower than those of AC group[sICAM-1 (817.9±133.2)μg/L vs(901.1±132.0)μg/L,sPs(83.46±16.24)μg/L vs(107.82±19.68) μg/L,cTnI(10.50±2.03) μg/L vs (14.45±2.26)μg/L],and the dedined degree of RC group were faster than those of AC group.Conclusion Retroperfusion has a better myocardial protection to the patients suffering heart valve replacement operation through active suppressed expression of sICAM-1,sPs and cTnI palliated inflammatory reaction.

Objective To explore the reaction time and attention bias characteristics of patients with first-episode depressive disorder.MethodsTotally 32 patients with first-episode depressive disorder (MD group) and 24 non-depression control participants(NC group) matched with MD group on age,gender and education level were enrolled in the study.The clinical symptoms were assessed by Beck Depression Inventory(BDI).All participants completed a dot-probe task to assess attentional preference for facial stimuli with varying valence (happy,sad and neutral facial expressions).ResultsThe reaction times(RTs) of MD group was longer than that of NC group in the dot-probe task ((468.6±87.7)ms,(451.7±82.5)ms,P<0.01).The four-way ANOVA revealed a significant main effect of prime duration,indicating overall shorter RTs on primes with longer duration ((476.9±88.4)ms vs (456.2±82.7)ms vs (447.7±83.9)ms,P<0.01).Compared with NC group,the scores of attention bias for sad faces were decreased in MD group ((7.43±26.4)ms vs (-4.97±19.5)ms,P<0.05).With the longer duration of presentation,the score of attention maintenance of emotional facies for MD group were increased (happy faces: (-11.0±4.8)ms,(2.2±6.9)ms,(6.1±8.5)ms;angry faces:(-1.6±7.5)ms,(6.5±8.6)ms,(14.9±6.7)ms).The adherence score of attention to happy faces were decreased ((1.8±5.6)ms,(-8.2±6.7)ms,(-8.7±7.1)ms),while the score of adherence score towards sad faces were increased ((-7.6±7.2)ms,(-2.6±8.5)ms,(1.5±6.2)ms) with increasing prime duration.ConclusionPatients with first-episode depressive disorder have slower response to emotional faces and associated with attentional bias for sad faces.With the increasing prime duration,it is more and more obvious to attentional bias in the two aspects of allocation and adherence.

Objective To compare the knee function in patients with intraoperative medial collateral ligament(MCL)injury treated with or with?out increased prosthetic constraint. Methods The records of 19 cases who encountered with iatrogenic injury to the MCL during total knee arthro?plasty(TKA)between January 2005 and December 2010 were retrospectively reviewed. Eight patients(LCCK group)were treated with increased prosthetic constraint;the remaining 11 patients(LPS group)received increased prosthetic constraint between January 2005 and December 2010 served as controls. The MCL was repaired after TKA. The complications were observed after operation. Knee society scores(KSS)subjective knee scores were used to assess the knee function. No patient was lost for follow?up. The mean follow?up was 5 years. Results Until last follow?up(60 months),The KSS subjective score was 87.4 for LCCK group compared with 93.3 for the LPS group. No revisions for knee instability were per?formed in the 11 patients treated with non?prosthetic constraint;however,2 patients treated with increased prosthetic constraint were revised due to joint loosening. Conclusion The MCL tear should be repaired during TKA;the type of the prosthesis should not be increased when MCL injury is recognized during TKA.

BACKGROUND:Bone marrow mesenchymal stem cells are considered as commonly used seed cells to construct tissue-engineered for repair of bone and cartilage defects. It is of great significance for cytology and tissue engineering experiments to study the common problems existing in the basic operation and how to avoid these problems in a timely manner. OBJECTIVE:To summarize the common problems existing in the process of operation in order to provide reliable methods about separation, culture and identification of bone marrow mesenchymal stem cells for beginners and researchers. These can reduce or avoid some errors and problems during operation. METHODS:Sixteen New Zealand white rabbits were selected as experiment objects, and bone marrow mesenchymal stem cells were separated from rabbits by iliac puncture, purified and augmented by using density gradient centrifugation combined with adherent culture method. Then cellmorphology was observed by inverted phase contrast microscope, growth curve detected by MTT method and cellphenotype identified by flow cytometry. RESULTS AND CONCLUSION:We encountered some problems in the process of separation and culture, when we operated the first five rabbits. After careful y summarizing and analysis of the reasons, the operation was successful y completed on the rest 11 rabbits. Bacteria pol ution and cellaging were not found in the process of cellculture. What is more, the cells at passage 3 appeared with high-expression of CD29, and CD44, but low expression of CD14 and CD34. The cellgrowth curve showed that the proliferation activity of cells at passages 3 and 5 was higher than that at passage 10. Although the technology of separation, culture and identification of bone marrow mesenchymal stem cells is mature, the failure wil be happen if we do not pay attention to the details of operation. By strictly carrying out normal operations, we can get high purity of bone marrow mesenchymal stem cells, which lays a good foundation for celland animal experiments in the future.