Matrix metalloproteinase (MMP) are a family of zinc-dependent endoproteinases whose enzymatic activity is directed against components of the extracelluar matrix(ECM). Their activities are inhibited by the tissue inhibitor of metalloproteinase (TIMP). MMP exerted an important role in invasion and metastasis of gastrointestinal cancer through degrading the ECM. With further research on inhibition of MMP, synthetic MMP inhibitor will have good prospects in the treatment of tumor invasion and metastasis.

AIM:To investigate the effects of MMP-7asODN on MMP-7 expression in human stomach cancer cell line KATOIII and explore the effect of MMP-7 on cancer invasion and metastasis. METHODS: A 15mer PS-asODNs targeted against the MMP-7 mRNA were introduced into KATOIII cells by FuGENE TM 6. The levels of MMP-7 mRNA was observed by reverse transcription polymerase chain reaction (RT-PCR). The ability of the invasion was observed by Boyden Chamber invasion assay. RESULTS: The MMP-7/?-actin ration was 0.31?0.02 for the PS-asODNs treated cells which is significantly lower compared with the control and PS-sODN and PS-mODN( 1.59?0.01, 1.14?0.03,1.51?0.02, respectivly.) P

Objective To estimate the value of the Angio seal (Vascular Cloure Device, St Jude Medical) in femoral artery closure after CAG (coronary angiography) or PCI (percutaneous coronary intervention). Methods From Oct 2002 to Oct 2003 316 patients received CAG or PCI at our hospital They were divided into group A (150 patients) and group B (166 patients) The Angio seal was useded in group A to close the puncturing spot of femoral artery, and the side of the body punctured was trigged for 4 hours Common hemostasis was adopted in group B Results As compared with group B, time to hemostasis and time to ambulation were notably decreased and groin hematoma and time to bleeding disposed at the puncture site were markedly reduced in group A Conclusion Safe and effective, the Angio seal may be widely adopted in clinical practice

Objective To follow up the patients with pacemaker, observe the condition of pacemaker lead, to explore the cause of lead dislocation, to find out and prevent its occurrence.Methods Summarizing the clinical data of 6 patients with pacemaker,7 pacemaker leads with 8 time dislocation,pacemaker 2 DDDR、2 DDD、2 VVI。 Results Four patients were punctured from right subclavian vein、one from left subclavian vein and one from right brachiocephalic vein; four leads were dislocation in atrium and one mildly dislocation; four leads dislocation in ventricle and two mildly dislocation; There were 3 old women with 4 leads and 5 times of dislocation. Conclusions

Purpose:To study the expression of MMP 7 gene in gastric cancer tissue and different stomach cancer cell line and explore its clinical significance.Methods:Reverse transcription polymerase chain reaction (RT PCR) was used to detect the expression of MMP 7 mRNA in 35 gastric cancer samples and the surrounding normal tissues and stomach cancer cell line. The ability of the invasion was observed by Boyden Chamber invasion assay. Results:The expression rate of MMP 7 mRNA in 35 gastric cancer samples and the surrounding normal tissues was 60% and 11%, respectively. The expression level of MMP 7 gene in gastric cancer was much higher than that in the surrounding normal tissues[(0 627?0 276)vs(0 237?0 12), P

Objective:To investigate the related factors and clinical significance of peritoneal micrometastasis in patients with gastric carcinoma,providing theoretical basis for resection range。Methods:CK19,CK20 immunohistochemistry were performed on 62 patients' tissues taken from anterior lobe of transverse mesocolon,posterior wall of omental bursa,pancreatic capsule and rectovesical pouch or Douglas pouch during the operations,compared with HE staining and peritoneal lavage cytology(PLC).Results:No metastasis was found by HE staining.Peritoneal micrometastasis were found in 27 cases out of 62 by immunohistochemistry,and its positive rate was 43.55%,obviously higher than PLC(14.52%).The peritoneal micrometastasis of gastric carcinoma had relations with diameter of tumor,depth of infiltration,clinical stage,lymph node metastasis(P0.05).Conclusion:Immunohistochemistric measure of CK 19 and CK20 can be effective to detect the micrometastasis of gastric carcinoma,which is helpful to guide clinical staging and useful to provide evidence for accurate selection of operation and postoperative treatment.Routine detection of peritoneal micrometastasis should be taken in patients of advanced gastric carcinoma,especially with a large size of serosa invasion.Multiple spots sampling is helpful to improve the detection rate.Anterior lobe of transverse mesocolon and pancreatic capsule should be peeled,and radical resection of omental bursa should be considered as routine operation in these patients.

AIM: To investigate the role of catecholamine, angiotensin converting enzyme(ACE) and adenosine triphosphatase in ischemic preconditioning in isolated rat hearts. METHODS: Isolated perfused rat heart was subjected to global ischemia for 40 min followed by reperfusion for 10 min (I/R). Preconditioning (PC) was induced by 5 min of ischemia and 10 min of reperfusion. The tissue concentrations in NE, and ACE, ATPase activities were determined in left ventricle in the PC and I/R groups by fluorometry and spectrophotometry. RESULTS: There were no significant difference in NE and ACE between PC and I/R groups. PC hearts showed improved recovery of the contractile function after 40 min ischemia/10 min reperfusion, but activities of the myocardial total ATPase, Mg2＋-ATPase, Na＋K＋-ATPase were inhibited markedly compared with I/R group. CONCLUSION: The inhibited myocardial ATPase may be involved in the mechanism of ischemic preconditioning protection in the isolated rat heart. Endogenous myocardial norepinephrine and ACE activation are not essential for ischemic preconditioning in the isolated rat heart.

Objective:To evaluate the effect of Vitapex in root canal therapy (RCT) for infected permanent teeth.Methods:159 permanent teeth with chronic periapical periodontitis were treated by RCT, and the canals were filled with Vitapex (in 54 teeth),ZOE (in 52 teeth) and ZOE plus iodoform (in 53 teeth) respectively.The effects were evaluated by clinical and radiological observation.Results:The ratio (%) of apical tissue reaction in 3 days following RCT in the group of Vitapex,ZOE and ZOE plus iodoform was 14.8,59.6 and 50.9 (P0.05) respectively.Conclusion:Vitapex is effective in the treatment of infected root canals.

BACKGROUND:Cartilage injury is stil one of the clinical problems difficult to be treated completely so far. Recently, the discovery of synovial mesenchymal stem cells (SMSCs) has brought about the new hope to cartilage repair.
OBJECTIVE:To explore the process concerning SMSCs-based therapy for cartilage repair in the past few years, such as the characteristics of SMSCs, culture conditions, preclinical and clinical studies, and then to summarize the literatures published in recent years.
METHODS:A computed-based online search of PubMed and SpringerLink databases was performed using the key words of“synovial mesenchymal stem cells, cartilage repair”for literatures published from January 1993 to May 2013.
RESULTS AND CONCLUSION:Final y, 37 articles were included. SMSCs have a greater proliferative capability, colony-forming potential and chondrogenic potential than other mesenchymal stem cells. The diseases such as osteoarthritis and rheumatoid arthritis can influence the characteristics of SMSCs. Numerous articles have aimed at the studies of cellculture in vitro and celltransplantation in vivo. However, the process of SMSCs therapy is mostly at its preliminary stage. Reports on its unique characteristics, optimal culture conditions and the high-quality clinical studies are stil largely lacking. In a word, though further studies are needed, SMSCs appear to be a promising cellsource for cartilage repair in the future.

BACKGROUND:With the increasing of aging, the incidence and mortality of osteoporotic hip fracture wil rise. It is of great significance to study the pathogenesis and preventing method. At present, finite element analysis can be used to judge fracture, only for the distribution trend of fracture failure in the starting point or section view, but it cannot completely reflect actual situation of fracture. OBJECTIVE:To build the fracture model of the femoral neck fracture caused by fal ing-induced external force based on the finite element analysis LS-DYNA software, and to evaluate the effect of rupture. METHODS:CT image data of one case of elderly femoral neck fracture were col ected. Using Mimics software, region growth of the contralateral area, cavity fil ing, editing, rebuilding the contralateral proximal femur model were conducted. Data were imported in Hypermesh and LS-DYNA software for meshing, and defining material properties. The failure parameters and interfacial properties were set. The load and force boundary constraints simulating the fal ing were simulated. The model of femoral neck fracture was calculated. Rupture effect was evaluated. RESULTS AND CONCLUSION:(1) The validity of contralateral proximal femur three-dimensional model was verified. Based on the finite element analysis software LS-DYNA, the femoral neck fracture model matched the actual fracture line to a degree of close to 83%. (2) Above results confirmed that based on the finite element analysis, LS-DYNA software can wel simulate the femoral neck fracture, which provides experimental basis to the exploration of femoral neck fracture classification mechanism caused by different fal ing-induced external forces.