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This study was designed to determine the effects of receptor activator of nuclear factor κB ligand (RANKL) on the mRNA expression of nuclear factor of activated T-cells, cytoplasmic, calcineurin-dependent 1 (NFATc1) and c‑Src in rat osteoclast‑like cells. The marrow cells were exposed to macrophage colony-stimulating factor (M‑CSF; 25 ng/ml) and different concentrations of RANKL (0, 50, 75 and 100 ng/ml) for 9 days. The mRNA expression of NFATc1 and c‑Src was determined by polymerase chain reaction. Compared with the M‑CSF (25 ng/ml)+RANKL (0 ng/ml) group, the levels of NFATc1 and c‑Src mRNA expression were significantly increased in the M‑CSF (25 ng/ml)+RANKL (75 and 100 ng/ml) groups (P&lt;0.01, P&lt;0.01, P&lt;0.01 and P&lt;0.01, respectively). Compared with the M‑CSF (25 ng/ml)+RANKL (50 ng/ml) group, the levels of NFATc1 and c‑Src mRNA expression was significantly increased in the M‑CSF (25 ng/ml)+RANKL (75 and 100 ng/ml) groups (P&lt;0.05, P&lt;0.01, P&lt;0.01 and P&lt;0.01, respectively). Compared with M‑CSF (25 ng/ml)+RANKL (75 ng/ml) group, the levels of NFATc1 and c‑Src mRNA expression was significantly increased in the M‑CSF (25 ng/ml)+RANKL (100 ng/ml) group, (P&lt;0.01 and P&lt;0.01, respectively). These data suggest that RANKL could regulate the expression of NFATc1 and c‑Src mRNA in the marrow culture system.

Role of RANKL in the regulation of NFATc1 and c-Src mRNA expression in osteoclast-like cells