No Abstract Available.

No Abstract Available.
Head* ; Osteonecrosis* ; Rabbits*

No Abstract Available.
Cell Adhesion Molecules* ; Cell Adhesion* ; Collagen Type II*

No Abstract Available.
Chondrocytes* ; Phenotype*

No Abstract Available.
Cadaver* ; Humans* ; Spinal Cord* ; Spine*

No Abstract Available.
Arthroplasty* ; Knee*

No Abstract Available.
Carpal Tunnel Syndrome* ; Collagen* ; Humans ; Ligaments*

Mesenchymal stem cells are stem cells originated from the mesoderm have the capacity to differentiate into cells of connective tissue lineages, including bone, fat, cartilage and muscle. Nontraumatic osteonecrosis of the femoral head has been suggested the cause is likely relevant to the poor proliferation activity of mesenchymal stem cells in the femoral head region. The altered function of mesenchymal stem cells may be responsible for the pathogenesis and progression of osteonecrosis, in steroid or alcohol induced nontraumatic osteonecrosis of femoral head.
Cartilage ; Connective Tissue ; Head ; Humans ; Mesenchymal Stromal Cells ; Mesoderm ; Muscles ; Osteonecrosis ; Stem Cells

PURPOSE: The intracellular mechanisms that lead to periprosthetic osteolysis including impaired bone forming activity of osteoblast remain incompletely characterized. To determine the possibility that Ti-particles play a role to regulate Wnt/beta-catenin signaling pathway in impaired osteogenesis, we analyzed the stability of beta-catenin and the transcriptional changes of regulators for Wnt/beta-catenin signaling pathway in MC3T3-E1 osteoblast cells. MATERIALS AND METHODS: Ti-particles were prepared by sterilizing and counted on the microscopy. Transcriptional changes of OPG, RANKL, LRP5, LRP6, DKK1 and sFRP2 were determined by real-time RTPCR. Protein level of beta-catenin and GSK3beta was detected using Western blotting and immunofluorescence staining. RESULTS: After 4 hours of treatment of Ti-particles, OPG/RANKL mRNA ratio was significantly decreased. And also, decreased protein levels of beta-catenin and phospho-GSK3beta were detected. Using immunofluorescence stain, it was confirmed that Ti-particles suppressed nucleus staining of beta-catenin induced by Wnt3a conditioned medium. The results of real-time RT-PCR showed reduced level of LRP5 and LRP6 transcripts, and induced level of DKK1 and sFRP2 transcripts by challenging of Ti-particles CONCLUSION: Our report suggests that Ti-particles may play a crucial role in the regulation of Wnt/beta-catenin signaling pathway in osteoblast through the transcriptional changes of membrane receptors and extracellular inhibitors for Wnt.
beta Catenin ; Blotting, Western ; Culture Media, Conditioned ; Fluorescent Antibody Technique ; Glycogen Synthase Kinase 3 ; Membranes ; Microscopy ; Osteoblasts ; Osteogenesis ; Osteolysis ; RNA, Messenger ; Titanium

PURPOSE: This study was performed to examine any histopathological changes occurring in the growth plate when the rats were subjected to be deprived of normal weight bearing using the hindlimb suspension model, and to search for any countermeasures for improving and/or recovering the chondrocyte activities within the growth plate. MATERIALS AND METHODS: Sixty male Sprague-Dawley rats, aged 6 weeks, were divided into 10 groups each: Group I-control to unloading; Group II-unloading 3 weeks only; Group III-unloading+application of heat shock; Group IV-unloading+application of antioxidant; Group V-unloading+application of heat shock and antioxidant; Group VI-control to reloading; Group VII-reloading 1 week only; Group VIII-reloading+application of heat shock; Group IX-reloading+application of antioxidant; Group X-reloading+application of heat shock and antioxidant. The animals were double labeled with 5-Bromo-2'-deoxydiuridin (BrdU) and BrdU immunohistochemistry was performed for the cellular kinetic analysis. Transferase-mediated deoxyuridine triphosphate-biotin nick end labeling (TUNEL) assay was done for the investigation of apoptotic changes in the growth plate, and the positive cells were counted in each zones of the growth plate in both TUNEL and BrdU immunohistochemistry. Heat shock protein (HSP), indian hedgehog (Ihh), and vascular endothelial growth factor (VEGF) were immunolocalized to assess the chondrocytic activities in terms of production of extracellular matrix protein. RESULTS: Non-weight bearing induced a reduction of height of the growth plate, reduced cellular proliferation of chondrocytes, reduced expression of Ihh and VEGF, and altered expression of heat shock protein. When heat shock and/or antioxidant were applied to the unloaded and reloaded rats, only rats in the group of application of both heat shock and antioxidant showed normal cellular activities in terms of cellular proliferation and the production of extracellular matrix protein. CONCLUSION: The present results suggest that application of heat shock and antioxidant would be a countermeasure for the restoration of chondrocytic activities when the normal weight-bearing is deprived of.
Aged ; Animals ; Bromodeoxyuridine ; Cell Proliferation ; Chondrocytes ; Deoxyuridine ; Extracellular Matrix ; Growth Plate ; Heat-Shock Proteins ; Hedgehogs ; Hindlimb Suspension ; Hot Temperature ; Humans ; Immunohistochemistry ; In Situ Nick-End Labeling ; Male ; Rats ; Rats, Sprague-Dawley ; Shock ; Ursidae ; Vascular Endothelial Growth Factor A ; Weight-Bearing