Abstract:
:Interleukin (IL)-17 is crucial to osteoclast differentiation and activation. Osteocytes support osteoclast formation and are thought to orchestrate bone remodeling in response to fluid flow. The contribution of IL-17 to osteocyte-related bone resorption remains unclear. Here, we used the osteocyte-like MLO-Y4 cell line to examine the role of IL-17 and fluid flow in osteoclastogenesis. It was the first time to demonstrate that IL-17A promoted MLO-Y4 cell proliferation, enhanced expression of receptor activator of nuclear factor κ-B ligand (RANKL) and tumor necrosis factor-α (TNF-α), and induced osteoclastogenesis when MLO-Y4 cells were co-cultured with bone marrow-derived macrophage (BMM) cells. Additionally, shear stress upregulated osteoprotegerin expression in osteocytes, downregulated the effect of IL-17A on RANKL and TNF-α expression, and attenuated IL-17A-activated osteoclastic differentiation in the co-culture system of MLO-Y4 and BMM cells. Furthermore, we explored the signaling pathways that potentially mediate these effects in osteocytes, and found that the extracellular signal-regulated kinase (ERK)1/2 and signal transducer and activator of transcription (STAT3) pathways were suppressed by IL-17A but induced by fluid flow. EphA2 signaling enhances osteoclastogenesis in osteocytes, and the intercellular reversed EphA2-ephrinA2 signaling from osteocytes to BMM play an important role in IL-17A-dependent osteoclastic differentiation. EphB4 signaling inhibits osteoclastogenesis in osteocytes, and the intercellular reversed EphB4-ephrinB2 signaling from osteocytes to BMM could inhibit IL-17A-dependent osteoclastic differentiation. The current findings suggest that IL-17A as a promoter of bone resorption and fluid shear stress critically regulate bone remodeling via osteocyte-specific signaling pathways. IL-17 modulation-based approaches may be developed as a novel therapeutic strategy for enhancing bone remodeling efficiency and stability.
journal_name
Bonejournal_title
Boneauthors
Liao C,Cheng T,Wang S,Zhang C,Jin L,Yang Ydoi
10.1016/j.bone.2017.04.003subject
Has Abstractpub_date
2017-08-01 00:00:00pages
10-20eissn
8756-3282issn
1873-2763pii
S8756-3282(17)30142-4journal_volume
101pub_type
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