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Man Y.,Zhabei District Central Hospital
Zhonghua yi xue za zhi | Year: 2011

To test the nickel-titanium (Ni-Ti) shape memory alloys of vertebral body reduction fixator with assisted distraction bar for the treatment of traumatic and osteoporotic vertebral body fracture. A Ni-Ti shape memory alloys of vertebral body reduction fixator with assisted distraction bar was implanted into the compressed fracture specimens through vertebral pedicle with the radiographic monitoring to reduce the collapsed endplate as well as distract the compressed vertebral fracture. Radiographic film and computed tomographic reconstruction technique were employed to evaluate the effects of reduction and distraction. A biomechanic test machine was used to measure the fatigue and the stability of deformation of fixation segments. Relying on the effect of temperature shape memory, such an assembly could basically reduce the collapsed endplate as well as distract the compressed vertebral fracture. And when unsatisfied results of reduction and distraction occurred, its super flexibility could provide additional distraction strength. A Ni-Ti shape memory alloys of vertebral body reduction fixator with assisted distraction bar may provide effective endplate reduction, restore the vertebral height and the immediate biomechanic spinal stability. So the above assembly is indicated for the treatment of traumatic and osteoporotic vertebral body fracture. Source


Guan L.,Zhabei District Central Hospital | Xu G.,Peking University
World Journal of Surgical Oncology | Year: 2016

Background: High-intensity focused ultrasound (HIFU) is a noninvasive therapy that makes entire coagulative necrosis of a tumor in deep tissue through the intact skin. There are many reports about the HIFU's efficacy in the treatment of patients with breast cancer, but randomized clinical trials are rare which emphasize on the systematic assessment of histological changes in the ablated tumor vascularities, while clinical trials utilizing bevacizumab and other anti-angiogenic drugs in breast cancer have not demonstrated overall survival benefit. The purpose of this study is to evaluate the damage effect of HIFU on breast cancer tissues and their vascularities. Methods: Randomized clinical trials and the modality of treat-and-resect protocols were adopted. The treated outcome of all patients was followed up in this study. The target lesions of 25 breast cancer patients treated by HIFU were observed after autopsy. One slide was used for hematoxylin-eosin (HE) staining, one slide was used for elastic fiber staining by Victoria blue and Ponceau's histochemical staining, and one slide was used for vascular endothelial cell immunohistochemical staining with biotinylated-ulex europaeus agglutinin I (UEAI); all three slides were observed under an optical microscopic. One additional slide was systematically observed by electron microscopy. Results: The average follow-up time was 12months; no local recurrence or a distant metastatic lesion was detected among treated patients. Histological examination of the HE slides indicated that HIFU caused coagulative necrosis in the tumor tissues and their vascularities: all feeder vessels less than 2mm in diameter in the insonated tumor were occluded, the vascular elasticity provided by fibrin was lost, the cells were disordered and delaminated, and UEAI staining of the target lesions was negative. Immediately after HIFU irradiation, the tumor capillary ultrastructure was destroyed, the capillary endothelium was disintegrated, the peritubular cells were cavitated, and the plasma membrane was incomplete. Conclusions: HIFU ablation can destroy all proliferating tumor cells and their growing vascularities simultaneously; this may break interdependent vicious cycle of tumor angiogenesis and neoplastic cell growth that results in infinite proliferation. While it cannot cause tumor resistance to HIFU ablation, it may be a new anti-angiogenic strategy that needs further clinical observation and exploration. Furthermore, the treatment indications of HIFU ablation were reviewed and discussed in this manuscript. © 2016 The Author(s). Source


Zhang Y.,Zhabei District Central Hospital | Yang C.-Q.,Shanghai University | Gao Y.,Shanghai University | Wang C.E.,Shanghai University | And 2 more authors.
Oncology Reports | Year: 2014

CXC chemokine receptor 7 (CXCR7) has been implicated in tumor development and metastasis in multiple malignancies. Yet, the function and molecular mechanisms of CXCR7 in human osteosarcoma (OS) are still unclear. The aim of the present study was to investigate the role of CXCR7 in human OS. The expression of CXCR7 was assessed by immunohistochemical assay using a tissue microarray procedure in 45 cases of OS tissues. A loss-of-function approach was used to observe the effects of lentiviral vector-mediated CXCR7 siRNA (Lv-siCXCR7) on biological behaviors including proliferative activities and invasive potential, as indicated by MTT and Transwell assays in OS (MG-63 and U-2 OS) cells. The results showed that the expression of CXCR7 protein in OS tissues was significantly increased compared to that in adjacent non-cancerous tissues (68.9 vs. 53.3%, P=0.033), and was correlated with the distant metastasis of the tumors (P=0.004). Knockdown of CXCR7 suppressed proliferation and invasion of OS cells through decreased expression of PI3K, AKT, β-arrestin, proliferating cell nuclear antigen (PCNA), and matrix metalloproteinase-9 (MMP-9). In addition, the tumor volume in U-2 OS subcutaneous tumor models treated with Lv-siCXCR7 was significantly smaller than the tumor volume in the negative control group (P<0.01). Collectively, our findings indicate that upregulation of CXCR7 expression is correlated with distant metastasis of OS, while knockdown of CXCR7 blocks the development of OS cells through inhibition of the PI3K/AKT and β-arrestin pathways, suggesting that CXCR7 may serve as a potential therapeutic target for the treatment of cancer. Source


Wu H.-J.,Shanghai University | Zhang Z.-Q.,U.S. Center for Disease Control and Prevention | Yu B.,Shanghai University | Liu S.,Zhabei District Central Hospital | And 2 more authors.
Cellular Physiology and Biochemistry | Year: 2010

Background and Aims: Hepatic fibrosis is associated with elevated sinusoidal pressure, which can be transmitted to the hepatic stellate cells (HSCs) in the perisinusoidal space of Disse. Here, we sought to determine the effects of pressure on cellular growth and Src-dependent signaling pathways in the rat HSCs. Methods: Cultured rat HSCs were exposed to pressures (0 to 80 mmHg) by using a pressure-inducing apparatus. The proliferation of the cells was determined by a 5-bromo-2′-deoxy-uridine (BrdU) incorporation assay. Reverse transcription-PCR and Western-blot analysis were used to examine the mRNA and protein levels of representative molecules in Src-dependent signaling pathways. Results: Pressure at 10 to 20 mmHg applied to the HSCs over 1 h upregulated Brdu incorporation and expression of proliferating cell nuclear antigen (PCNA) and type I collagen, while a higher pressure of 40-80 mmHg did not have noticeable effect. The mRNA level of β 3 integrin was increased by 1-h application of 5 to 20 mmHg. Immunoblot with phospho-specific antibodies demonstrated the phosphorylation of Src (Tyr418), focal adhesion kinase (FAK) (Tyr397), Akt (Ser473) and extracellular signal-regulated kinases 1 and 2 (ERK1/2) (Thr421/Ser424) was increased in response to 10-mmHg pressure. Herbimycin A, an inhibitor of Src phosphorylation, attenuated the pressure-induced HSC proliferation and phosphorylation of above-mentioned signaling molecules. Conclusion: Our data demonstrated that pressure alone induced HSC proliferation involving the activation of Src-dependent signaling pathways. © 2010 S. Karger AG, Basel. Source


Zhang J.F.,Shanghai JiaoTong University | Yao G.Y.,Shanghai JiaoTong University | Wu Y.H.,Zhabei District Central Hospital
Genetics and Molecular Research | Year: 2012

The aim of this study was to identify related genes and the underlying molecular mechanisms in obese patients who show a series of clinical and metabolic abnormalities known as metabolic syndrome. We identified expression profiles through a coexpression network. In addition, a similarity matrix and expression modules were constructed based on domain and pathway enrichment analysis. The genes in module 1 were mainly involved in the metabolism of xenobiotics by cytochrome P450, aldosterone-regulated sodium reabsorption, and focal adhesion owing to the presence of aldo/ketoreductase, basic helix-loop-helix, von Willebrand factor, Frizzled-related domain, and other domains. The genes in module 3 may be involved in cell cycle (hsa04110) and DNA replication (hsa03030) pathways through mini-chromosome maintenance, serine/threonine protein kinase, the protein kinase domain, and other domains. We analyzed the published molecular mechanisms of obesity and found many genes and pathways that have not been given enough attention and require further confirmation. © FUNPEC-RP. Source

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