| First Author | Bökers S | Year | 2014 |
| Journal | J Immunol | Volume | 192 |
| Issue | 7 | Pages | 2994-3002 |
| PubMed ID | 24600033 | Mgi Jnum | J:210020 |
| Mgi Id | MGI:5569414 | Doi | 10.4049/jimmunol.1303367 |
| Citation | Bokers S, et al. (2014) Siglec-G deficiency leads to more severe collagen-induced arthritis and earlier onset of lupus-like symptoms in MRL/lpr mice. J Immunol 192(7):2994-3002 |
| abstractText | Siglec-G is a member of the sialic acid-binding Ig-like lectin (Siglec) family expressed on all B cells. Siglec-G-deficient mice show a large expansion of the B1 cell compartment, demonstrating the crucial role of Siglec-G as an inhibitory receptor on this cellular subset. Although Siglec-G-deficient mice did not develop spontaneous autoimmunity, mice double-deficient for Siglec-G and the related Siglec protein CD22 did show autoimmunity at an older age. In this study, we addressed the question of whether loss of Siglec G on its own affects disease severity in animal models of rheumatoid arthritis and systemic lupus erythematosus. Siglec-G-deficient mice showed moderately increased clinical severity and higher inflammation of the knee joints following collagen-induced arthritis, when compared with control mice. The Siglec-G-deficient mouse was also backcrossed to the autoimmune prone MLR/lpr background. Although both Siglec-G-deficient and control MRL/lpr mice developed a lupus-like disease, Siglec-G-deficient MRL/lpr mice showed an earlier occurrence of autoantibodies; a higher lymphoproliferation of B and T cells; and an earlier onset of disease, as shown by proteinuria and glomerular damage in the kidney. Moreover, Siglec-G-deficient female mice showed a significantly reduced survival compared with female control MRL/lpr mice. Thus, the loss of the inhibitory receptor Siglec-G led to a moderate exacerbation of disease severity and early onset in both collagen-induced arthritis and spontaneous lupus nephritis in MRL/lpr mice. |
