Department of Orthopaedic Surgery, Stanford University School of Medicine, Stanford, California, USA.
J Orthop Res. 2012 Apr;30(4):547-53. doi: 10.1002/jor.21548. Epub 2011 Sep 12.
The biological mechanisms leading to periprosthetic osteolysis involve both chemokines and the monocyte/macrophage cell lineage. Whether MCP-1 plays a major role in macrophage recruitment in the presence of wear particles is unknown. We tested two hypotheses: (1) that exogenous local delivery of MCP-1 induces systematic macrophage recruitment and (2) that blockade of the MCP-1 ligand-receptor axis decreases macrophage recruitment and osteolysis in the presence of ultra high molecular weight polyethylene (UHMWPE) particles. Six groups of nude mice were used. We used non-invasive imaging to assay macrophage recruitment and osteolysis. A murine macrophage cell line and primary wild type and CCR2 knockout murine macrophages were used as the reporter cells. Particles were infused into the femoral canal. Bioluminescence and immunohistochemical staining were used to confirm the migration of reporter cells. Locally infused MCP-1 induced systemic macrophage trafficking to bone. Injection of MCP-1 receptor antagonist significantly decreased reporter cell recruitment to bone infused with UHMWPE particles and decreased osteolysis. Systemic migration of reporter cells to infused particles was decreased when the reporter cells were deficient in the CCR2 receptor. Interruption of the MCP-1 ligand-receptor axis appears to be a viable strategy to mitigate trafficking of macrophages and osteolysis due to UHMWPE particles.
导致假体周围骨溶解的生物学机制涉及趋化因子和单核细胞/巨噬细胞细胞谱系。在磨损颗粒存在的情况下,MCP-1 是否在巨噬细胞募集中起主要作用尚不清楚。我们检验了两个假设:(1)外源性局部递送 MCP-1 诱导系统性巨噬细胞募集,(2)阻断 MCP-1 配体-受体轴减少超高分子量聚乙烯 (UHMWPE) 颗粒存在时的巨噬细胞募集和骨溶解。使用了六组裸鼠。我们使用非侵入性成像来检测巨噬细胞募集和骨溶解。使用鼠巨噬细胞系和原代野生型和 CCR2 敲除鼠巨噬细胞作为报告细胞。将颗粒注入股骨髓腔。生物发光和免疫组织化学染色用于确认报告细胞的迁移。局部注射的 MCP-1 诱导系统性巨噬细胞向骨迁移。注射 MCP-1 受体拮抗剂显著减少了注入 UHMWPE 颗粒的报告细胞向骨的募集,并减少了骨溶解。当报告细胞缺乏 CCR2 受体时,报告细胞向注入颗粒的系统性迁移减少。中断 MCP-1 配体-受体轴似乎是一种可行的策略,可以减轻由于 UHMWPE 颗粒引起的巨噬细胞迁移和骨溶解。