| First Author | Kwon JO | Year | 2019 |
| Journal | J Immunol | Volume | 202 |
| Issue | 12 | Pages | 3359-3369 |
| PubMed ID | 31076532 | Mgi Jnum | J:275614 |
| Mgi Id | MGI:6307685 | Doi | 10.4049/jimmunol.1800661 |
| Citation | Kwon JO, et al. (2019) Haptoglobin Acts as a TLR4 Ligand to Suppress Osteoclastogenesis via the TLR4-IFN-beta Axis. J Immunol 202(12):3359-3369 |
| abstractText | Haptoglobin (Hp), a type of acute-phase protein, is known to have a systemic anti-inflammatory function and to modulate inflammation by directly affecting immune cells, such as T cells, dendritic cells, and macrophages. However, the effects of Hp on osteoclast differentiation are not well studied, even though osteoclast precursor cells belong to a macrophage-monocyte lineage. In this study, we found that the bone volume was reduced, and the number of osteoclasts was increased in Hp-deficient mice compared with wild-type mice. Moreover, our in vitro studies showed that Hp inhibits osteoclastogenesis by reducing the protein level of c-Fos at the early phase of osteoclast differentiation. We revealed that Hp-induced suppression of c-Fos was mediated by increased IFN-beta levels. Furthermore, Hp stimulated IFN-beta via a TLR4-dependent mechanism. These results demonstrate that Hp plays a protective role against excessive osteoclastogenesis via the Hp-TLR4-IFN-beta axis. |
