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- W2021142196 abstract "Aseptic loosening is often mentioned as the primary reason for costly revision of total joint arthroplasties. Receptor activator of nuclear factor-kappaB ligand (RANKL) appears to be a major factor in the bone resorption observed in periprosthetic osteolysis. RANKL plays an essential role in the recruitment, differentiation, and survival of the osteoclasts implicated in periprosthetic osteolysis. This study was performed in an effort to identify the cell type in the periprosthetic membrane responsible for expression of RANKL.Tissues harvested from osteolytic lesions in nine patients undergoing total joint revision were serially sectioned for immunohistochemical analysis. Intercellular adhesion molecule-1 (ICAM-1) and prolyl 4-hydroxylase (5B5) antibodies were used to detect fibroblasts, and anti-CD-163 (Ber-MAC3) was used to detect macrophages. In addition, antibodies to osteoprotegerin (OPG), RANKL, and receptor activator of nuclear factor-kappaB (RANK) were utilized. The binding pattern of these antibodies was then viewed with confocal microscopy with the use of only secondary antibodies as method controls.Histological analysis was confined to areas of the membrane where cells were detected with use of Hoechst 34580 nuclear stain. In the membrane specimens from all nine patients, diffuse RANKL staining was localized to areas lacking cells and more intense staining was seen in areas containing nucleated cells. There was strong colocalization between RANKL and OPG, and there was weak but specific colocalization between RANKL and both 5B5 and ICAM-1. In contrast, there was complete separation of antibody staining of Ber-MAC3 and RANKL, indicating only generalized overlap of the myeloid markers with the RANKL.RANKL expression was localized to cells that stained positively for fibroblast markers. The data also indicated that there is an intact RANKL/RANK/OPG system in the periprosthetic membrane that could regulate focalized bone resorption in osteolysis.Identifying the cell types responsible for RANKL production is critical to the development of a strategy to prevent periprosthetic osteolysis." @default.
- W2021142196 created "2016-06-24" @default.
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- W2021142196 date "2007-04-01" @default.
- W2021142196 modified "2023-10-01" @default.
- W2021142196 title "Expression of RANKL in Osteolytic Membranes" @default.
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- W2021142196 doi "https://doi.org/10.2106/jbjs.f.00655" @default.
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