| First Author | Lee EK | Year | 2005 |
| Journal | Int Immunol | Volume | 17 |
| Issue | 3 | Pages | 325-33 |
| PubMed ID | 15684036 | Mgi Jnum | J:96356 |
| Mgi Id | MGI:3530204 | Doi | 10.1093/intimm/dxh212 |
| Citation | Lee EK, et al. (2005) Essential roles of Toll-like receptor-4 signaling in arthritis induced by type II collagen antibody and LPS. Int Immunol 17(3):325-33 |
| abstractText | Although bacterial LPS has been used to boost the susceptibility to antibody-induced arthritis, the mechanism of the action of LPS remains to be clarified. We investigated whether signals triggered by Toll-like receptor (TLR)-4 mediate the effects of LPS in the context of anti-type II collagen-induced arthritis. The mice defective in the Tlr-4 gene (Tlr-4(lps-d)) were markedly less susceptible than wild type to arthritis, as manifested in arthritic index, incidence and synovitis. Levels of the pro-inflammatory mediators, tumor necrosis factor-alpha and cyclooxygenase-2, in their synovial tissue were also much lower. Serum C3 deposition through the alternative pathway and de novo synthesis of C3 were lower in the Tlr-4(lps-d) mice in the post-acute phase, pointing to an influence of TLR-4 signals on the turnover rate of complement cascades. T cells from the Tlr-4(lps-d) mice failed to proliferate in response to an auto-antigen, glucose-6-phosphate isomerase (GPI), unlike those from wild-type mice, and the serum level of GPI-specific IgG antibody was significantly lower than in the wild-type mice. Interestingly, type 2 responses, such as GPI-specific IgG(1) and IL-4 production, were up-regulated in the Tlr-4(lps-d) mice. Taken together, our data suggest that the TLR-4 signaling pathway plays an essential role in the initiation and progression of auto-antibody/LPS-triggered arthritis by inducing pro-inflammatory mediators, C3 deposition, auto-antigen-specific adaptive immune responses and immune deviation between type 1 and type 2 responses. |
