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Nephrol Dial Transplant (2003) 18: 178-181
© 2003 European Renal Association-European Dialysis and Transplant Association

Brief Reports

Heterogeneity of antigen expression explains controversy over glomerular macrophage accumulation in mouse glomerulonephritis

Takao Masaki1, Fiona Chow1,2, David J. Nikolic-Paterson1,2, Robert C. Atkins1,2 and Gregory H. Tesch1,2,

1 Department of Nephrology and 2 Monash University Department of Medicine, Monash Medical Centre, Clayton, Victoria, Australia

Background. Many antibody labelling studies have suggested that there are few or no glomerular macrophages in mouse models of glomerulonephritis, despite the presence of a prominent interstitial macrophage infiltrate. These findings conflict with studies of human and rat glomerulonephritis. Therefore, we examined whether heterogeneity of macrophage antigen expression could explain this apparent discrepancy.

Methods. Kidneys were collected from normal mice and mice killed at 2 and 10 days after induction of accelerated anti-glomerular basement membrane (GBM) glomerulonephritis. Following fixation, macrophages were detected by immunoperoxidase staining in serial kidney sections using antibodies recognising CD11b, F4/80 and CD68.

Results. Induction of anti-GBM nephritis caused a progressive increase in glomerular and interstitial leukocytes. At days 2 and 10, there were more CD68+ macrophages in glomeruli than macrophages expressing CD11b or F4/80. At day 10, CD68+ macrophages accounted for almost all glomerular CD45+ total leukocytes. In contrast, CD11b+ and F4/80+ macrophages at day 10 accounted for only 65 and 13% of glomerular leukocytes, respectively. However, in the interstitium the number of macrophages expressing CD68, CD11b and F4/80 were not different.

Conclusion. Antibody detection of mouse CD68 identifies all glomerular macrophages in mouse anti-GBM nephritis, indicating a similar infiltrate to that seen in human and rat anti-GBM nephritis. Our finding of substantial heterogeneity in glomerular macrophage antigen expression in this model suggests that previous studies of mouse glomerulonephritis may have underestimated glomerular macrophages and their role in glomerular injury.

Keywords: antigen expression; interstitial macrophage infiltrate; glomerular injury; mouse glomerular macrophages; mouse glomerulonephritis

Correspondence and offprint requests to: Dr Greg Tesch, Department of Nephrology, Monash Medical Centre, 246 Clayton Road, Clayton, Victoria 3168, Australia. Email: gtesch{at}hotmail.com


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