| First Author | Yang C | Year | 2010 |
| Journal | PLoS One | Volume | 5 |
| Issue | 11 | Pages | e15383 |
| PubMed ID | 21151480 | Mgi Jnum | J:167281 |
| Mgi Id | MGI:4867757 | Doi | 10.1371/journal.pone.0015383 |
| Citation | Yang C, et al. (2010) NIK stabilization in osteoclasts results in osteoporosis and enhanced inflammatory osteolysis. PLoS One 5(11):e15383 |
| abstractText | BACKGROUND: Maintenance of healthy bone requires the balanced activities of osteoclasts (OCs), which resorb bone, and osteoblasts, which build bone. Disproportionate action of OCs is responsible for the bone loss associated with postmenopausal osteoporosis and rheumatoid arthritis. NF-kappaB inducing kinase (NIK) controls activation of the alternative NF-kappaB pathway, a critical pathway for OC differentiation. Under basal conditions, TRAF3-mediated NIK degradation prevents downstream signaling, and disruption of the NIK:TRAF3 interaction stabilizes NIK leading to constitutive activation of the alternative NF-kappaB pathway. METHODOLOGY/PRINCIPAL FINDINGS: Using transgenic mice with OC-lineage expression of NIK lacking its TRAF3 binding domain (NT3), we now find that alternative NF-kappaB activation enhances not only OC differentiation but also OC function. Activating NT3 with either lysozyme M Cre or cathepsinK Cre causes high turnover osteoporosis with increased activity of OCs and osteoblasts. In vitro, NT3-expressing precursors form OCs more quickly and at lower doses of RANKL. When cultured on bone, they exhibit larger actin rings and increased resorptive activity. OC-specific NT3 transgenic mice also have an exaggerated osteolytic response to the serum transfer model of arthritis. CONCLUSIONS: Constitutive activation of NIK drives enhanced osteoclastogenesis and bone resorption, both in basal conditions and in response to inflammatory stimuli. |
