Osteoclast generation from RAW 264.7 and PBMC cells. The set up in our lab

Introduction and objectives: osteoclasts are terminally differentiated giant multinucleated cells derived from the fusion of mononuclear progenitors of the monocyte/macrophage hematopoietic lineage. The objective of our group was to achie-ve the best method for osteoclast differentiation, from both RAW 264.7 cells and peripheral blood monocytes.Material and methods: RAW 264.7 cells and human PBMCs were differentiated into osteoclasts. Success in differentiation was assessed by TRAP staining. Osteoclast activity was detected by the resorption pits in Corning (R) Osteo Assay Surface Plates.Results: the optimal cell density for RAW 264.7 cell differentiation was 25,000 cells/cm2 with 30 ng/mL of RANKL for 6 days. Osteoclasts differentiated from PBMCs were observed after 4 weeks with 25 ng/mL M-CSF and 30 ng/mL RANKL. Individual pits or multiple pit clusters were observed on the surface plates.Conclusions: we report optimal conditions for the differentiation of osteoclasts from