Interleukin-6 receptor blockage ameliorates murine lupus nephritis.
The therapeutic effects of a neutralizing monoclonal antibody (mAb) to the interleukin-6 receptor (IL-6R) were examined in the MRL-lpr/lpr murine lupus nephritis model. Animals (15 wk old) were treated with ip mAb IL-6R for 5 wk. GFR in these mice at the end of this treatment period were comparable to those of congenic strain disease-resistant MRL-(+)/+ controls treated with rat immunoglobulin G (IgG) (254 +/- 61 versus 285 +/- 26 microL/min; P = not significant). GFR was significantly (P < 0.05) lower in lpr/lpr mice receiving ip rat IgG (disease controls) at the same time (165 +/- 76 microL/min). The fractional mesangial volume (Mv) and surface density of open glomerular capillaries (Sv) in mAb II-6R-treated lpr/lpr and IgG-treated +/+ mice (Mv, 0.21 +/- 0.04 and 0.19 +/- 0.04 micron3/micron3; Sv, 0.18 +/- 0.01 and 0.20 +/- 0.01 micron/micron2, respectively) were similar. However, Mv (0.40 +/- 0.04) was significantly higher (P < 0.001) and Sv (0.13 +/- 0.04) was lower (P < 0.01) in IgG-treated lpr/lpr animals. Treatment with mAb IL-6R significantly reduced anti-dsDNA antibody levels after Week 2 of treatment, but these values rebounded at Week 4. The late development of neutralizing antibodies and the increased secretion of IL-6 at Week 4 were likely responsible. Despite these events, neutralizing mAb to the IL-6R proved to be effective therapeutically, as demonstrated by preserved glomerular function and structure.
Kiberd
B A
BA
Department of Medicine, Queen's University, Kingston, Ontario, Canada.
D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology / Q000627:therapeutic use*; D005260:Female; D015850:Interleukin-6 / Q000378:metabolism*; D007678:Kidney Glomerulus / Q000503:physiopathology; D008181:Lupus Nephritis / Q000503:physiopathology / Q000628:therapy*; D051379:Mice; D018123:Receptors, Interleukin / Q000037:antagonists & inhibitors* / Q000276:immunology / Q000378:metabolism; D019947:Receptors, Interleukin-6
D000911:Antibodies, Monoclonal; D015850:Interleukin-6; D018123:Receptors, Interleukin; D019947:Receptors, Interleukin-6