| First Author | Rosetti F | Year | 2012 |
| Journal | J Immunol | Volume | 189 |
| Issue | 7 | Pages | 3714-23 |
| PubMed ID | 22933624 | Mgi Jnum | J:190352 |
| Mgi Id | MGI:5448626 | Doi | 10.4049/jimmunol.1201594 |
| Citation | Rosetti F, et al. (2012) Human lupus serum induces neutrophil-mediated organ damage in mice that is enabled by Mac-1 deficiency. J Immunol 189(7):3714-23 |
| abstractText | Systemic lupus erythematosus (SLE) is a chronic, multiorgan inflammatory autoimmune disorder associated with high levels of circulating autoantibodies and immune complexes. We report that passive transfer of human SLE sera into mice expressing the uniquely human FcgammaRIIA and FcgammaRIIIB on neutrophils induces lupus nephritis and in some cases arthritis only when the mice additionally lack the CD18 integrin, Mac-1. The prevailing view is that Mac-1 on macrophages is responsible for immune complex clearance. However, disease permitted by the absence of Mac-1 is not related to enhanced renal immune complex deposition or in situ C1q/C3 complement activation and proceeds even in the absence of macrophages. Instead, disease is associated with increased FcgammaRIIA-induced neutrophil accumulation that is enabled by Mac-1 deficiency. Intravital microscopy in the cremasteric vasculature reveals that Mac-1 mitigates FcgammaRIIA-dependent neutrophil recruitment in response to deposited immune complexes. Our results provide direct evidence that human SLE immune complexes are pathogenic, demonstrate that neutrophils are primary mediators of end organ damage in a novel humanized lupus mouse model, and identify Mac-1 regulation of FcgammaRIIA-mediated neutrophil recruitment as a key step in development of target organ damage. |
