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1.
G. D. Solofomalala M. Guery A. Lesiourd J. C. Le Huec D. Chauveaux O. Laffenetre 《European journal of orthopaedic surgery & traumatology : orthopedie traumatologie》2007,17(6):609-615
Since their discovery 40 years ago by Urist M., several studies have been done on the bone morphogenetic proteins (BMP). They belong to the superfamily of TGF β (Transforming Growth Factor) and are the only osteo-inductive growth factors known until now. They are nowadays up to 20. After the fixation of these molecules on their receptors, intracellular cell reactions occur, inducing bone formation by the activation of genes responsible for cartilaginous formation and osteogenesis. In experimental studies on animal species, BMP showed their efficiency on the recovery of bone defects, on the acceleration of fractures consolidation or spine arthrodesis fusion or on pseudarthrodesis treatment. To be efficient, BMP must be used at the proper dose and delivered locally for a sufficient period by a biocompatible and biodegradable matrix, whose tridimensional structure allows its invasion by new bone and vascular cells. According to these data, clinical trials have been conducted on the human. Only rhBMP-2 and rhBMP-7 uses are validated for definite clinical applications (vertebral fusion, tibial pseudarthrosis and open leg fracture) by the results of randomized multicentric studies. Other clinical applications have been reported in the literature but large-scale studies are still necessary to confirm their results. Even if the clinical results are sometimes spectacular, and if the use of BMP, currently reserved because of their cost, in difficult situations give rise to big hopes, many questions remain unsolved. These questions will probably be dealt with in the future: stability of the new bone formation, eventual long-term adverse effects. 相似文献
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Olivier Epaulard Bertrand Toussaint Lauriane Quenee Madiha Derouazi Nabil Bosco Christian Villiers Rozenn Le Berre Benoit Guery Didier Filopon Laurence Crombez Patrice N Marche Benoit Polack 《Molecular therapy》2006,14(5):656-661
Immunotherapy requiring an efficient T lymphocyte response is initiated by antigen delivery to antigen-presenting cells. Several studies have assessed the efficiency of various antigen loading procedures, including microbial vectors. Here a live strain of Pseudomonas aeruginosa was engineered to translocate a recombinant antigenic protein into mammalian cells via the type III secretion system, a bacterial device translocating effector proteins into host cells. Optimization of the vector included virulence attenuation and determination of the N-terminal sequence allowing translocation of fused antigens into cells. In vitro delivery of an ovalbumin fragment by the bacterial vector into dendritic cells induced the activation of ovalbumin-specific CD8(+) T lymphocytes. Mice injected with the ovalbumin-delivering vector developed ovalbumin-specific CD8(+) T lymphocytes and were resistant to a subsequent challenge with an ovalbumin-expressing melanoma. Moreover, in a curative assay, injection of the vaccine vector 5 and 12 days after tumor implantation led to a complete cure in five of six animals. These results highlight the utility of type III secretion system-based vectors for anti-tumor immunotherapy. 相似文献
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Oscillatory motion of the normal cervical spinal cord 总被引:2,自引:0,他引:2
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A. Prevotat C. Rouyer P. Gosset E. Kipnis K. Faure B. Guery 《Médecine et maladies infectieuses》2018,48(2):103-113
Objectives
Streptococcus pneumoniae is the leading cause of community-acquired pneumonia. We aimed to analyze the epithelial response to S. pneumoniae-induced lung injury.Methods
Using an in vitro model with 16HBE cells and experimental in vivo murine model of acute lung injury, we analyzed the epithelial response to S. pneumoniae. Lung epithelial cell monolayers were exposed to S. pneumoniae and permeability was assessed by transepithelial resistance (TER) measurement and organization and expression of junction proteins. Functional consequences were studied with an in vivo murine model measuring alveolar permeability, distal alveolar fluid clearance (DAFC), and the alveolar inflammatory response.Results
In vitro, S. pneumoniae induced a dose-dependent decrease in transepithelial resistance, which was associated with significant modifications in the organization of junction proteins assessed by immunofluorescence staining and expression after 6 hours of exposure. In vivo, S. pneumoniae induced a transient increase in alveolar permeability with an adequate increase in DAFC 6 hours post infection. In a second phase, a permanent increased permeability was associated with a major decrease in DAFC.Conclusion
Overall, the epithelial response to S. pneumoniae followed a biphasic pattern with an initial reversible increase in permeability related to the alteration of tight and adherens junctions and a second phase associated with an epithelial injury with a major increase in permeability with a decreased DAFC reflecting an injured alveolar capillary barrier. 相似文献10.