| First Author | Inoue A | Year | 2016 |
| Journal | Sci Rep | Volume | 6 |
| Pages | 38684 | PubMed ID | 27995997 |
| Mgi Jnum | J:269188 | Mgi Id | MGI:6215933 |
| Doi | 10.1038/srep38684 | Citation | Inoue A, et al. (2016) TIARP attenuates autoantibody-mediated arthritis via the suppression of neutrophil migration by reducing CXCL2/CXCR2 and IL-6 expression. Sci Rep 6:38684 |
| abstractText | TNFalpha-induced adipose-related protein (TIARP) is a six-transmembrane protein expressed on macrophages, neutrophils and synoviocytes. We reported recently that mice deficient in TIARP (TIARP(-/-)) spontaneously develop arthritis and are highly susceptible to collagen-induced arthritis (CIA) with enhanced interleukin (IL)-6 production. However, the effects of TIARP on neutrophils and fibroblast-like synoviocytes (FLS) have not been elucidated. We analyzed the roles of TIARP in K/BxN serum transfer model using TIARP(-/-) mice. Arthritis in TIARP(-/-) mice transferred with K/BxN serum was significantly exacerbated compared with WT mice. We characterized the differences in neutrophils between wild-type (WT) and TIARP(-/-) mice by DNA microarray. Overexpression of CXCR1 and CXCR2 was noted in TIARP(-/-) neutrophils. Neutrophils of TIARP(-/-) mice showed strong migration activity, which was markedly facilitated by CXCL2 in vitro and in vivo. Moreover, enhanced production of CXCL2 and IL-6 and cell proliferation was noted in TIARP(-/-) TNFalpha-stimulated FLS. Blockade of IL-6R significantly attenuated serum-transferred TIARP(-/-) arthritis with diminished neutrophil recruitment in joints. Our findings suggested that TIARP independently down-regulated CXCL2 and IL-6 production by FLS, and the expression of chemokine receptors (CXCR1 and CXCR2) in neutrophils, with resultant reduction of neutrophil migration into arthritic joints. |
