Abstract
Arthroplasty is a very successful medical procedure. Failures depend on aseptic loosening caused by periprosthetic osteolysis, where T cells have a contradictory role. We analyzed osteoclastogenesis in peripheral blood mononuclear cell (PBMC) cultures of periprosthetic osteolysis patients and the phenotype of T cells localized in periprosthetic tissues. We enrolled 45 subjects with periprosthetic osteolysis (15), stable prosthesis (15) and healthy controls (15). We performed PBMC cultures to study osteoclastogenesis. Osteoclasts and T cell phenotype were examined by immunohistochemistry, immunofluorescence and flow citometry. Periprosthetic osteolysis patients showed spontaneous osteoclastogenesis, which was inhibited by RANK-Fc and T cell depletion. In periprosthetic osteolysis patients' PBMC cultures, CD4 and CD8 T cells increased and CD8 T cells did not express CD25. In periprosthetic tissues T cells were close to osteoclasts, suggesting their interaction. Local CD8 T cells showed a regulatory phenotype, expressing CD25 and FoxP3, while CD4 T cells did not express activation markers. Our data suggest that, in an early stage of periprosthetic osteolysis, T cells may promote osteoclastogenesis, whereas subsequently osteoclasts...Continue Reading
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