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Interleukin (IL)-29 is known to modulate immune functions of monocytes or macrophages. In this study, we investigated the effect and its underlying mechanism of IL-29 on receptor activator of nuclear factor κB ligand (RANKL)-induced osteoclastogenesis using murine macrophage cell line RAW264.7 cells and bone-marrow-derived monocyte/macrophage precursor cells (BMMs), and human peripheral blood mononuclear cells (PBMCs). In response to human recombinant IL-29, cell viability and apoptosis were assessed by Cell Counting Kit-8 and flow cytometry; the osteoclast formation and activity by tartrate-resistant acid phosphatase (TRAP) staining and pit formation assay, respectively; the expression and activation of molecules that associated with osteoclastogenesis by real time-PCR, immunoblotting or immunofluorescent analysis. IL-28 receptor α (IL-28Rα), a specific receptor of IL-29 was expressed on RAW264.7 cells. Although IL-29 did not affect the viability and apoptosis of RAW264.7 cells, it inhibited multinucleated cells in the differentiation of osteoclastogenesis, the bone-resorbing activity of mature osteoclasts and osteoclastic specific genes expression including TRAP, cathepsin K (CTSK), nuclear factor of activated T-cells, cytoplasmic 1 (NFATc1), C-Fos and matrix metallopeptidase 9 (MMP-9). This inhibitory effect of IL-29 was confirmed on BMMs and PBMCs and mediated via IL-28Rα through the activation of Stat1 and 3 and the suppression of nuclear factor kappa B (NF-κB) and NFATc1 nuclear translocation in RAW264.7 cells. In conclusion, IL-29 inhibited osteoclastogenesis via activation of STAT signaling pathway, prevention of NF-κB activation and NFATc1 translocation, and suppression of downstream osteoclastogenic genes expression.
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