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Glomerular macrophage proliferation in experimental immune complex nephritis.
K Y Ren1, J Brentjens, Y X Chen
1Department of Microbiology, School of Medicine, State University of New York, Buffalo 14214.
Clinical Immunology and Immunopathology
|September 1, 1991
Summary
In immune complex nephritis, macrophages within the glomerulus actively divide. This proliferation significantly contributes to glomerular hypercellularity and kidney damage during disease.
Area of Science:
- Nephrology
- Immunopathology
- Cell Biology
Background:
- Immune complex nephritis causes glomerular hypercellularity due to intrinsic cell proliferation and mononuclear cell infiltration, mainly macrophages.
- The role of macrophage proliferation within the glomerular tuft during nephritis remains incompletely understood.
Purpose of the Study:
- To investigate whether macrophages undergo mitosis within the glomerular tuft in immune complex nephritis.
- To quantify the contribution of glomerular macrophage proliferation to hypercellularity in a rat model of nephritis.
Main Methods:
- Utilized an immunohistochemical double-labeling technique with ED1 antibody (macrophage marker) and bromodeoxyuridine (S-phase marker).
- Studied chronic serum sickness in LEW rats, a well-characterized model of immune complex nephritis.
- Assessed glomerular macrophage proliferation in vivo and in short-term culture in vitro.
Main Results:
- In normal glomeruli, resident mesangial macrophages constituted a significant portion (≥1/3) of mitotic activity.
- During immune complex glomerulonephritis, glomerular macrophage proliferation increased sharply at proteinuria onset and remained elevated.
- Macrophages from nephritic rats exhibited more vigorous proliferation in vitro and expressed abnormal surface markers.
Conclusions:
- Mesangial macrophage proliferation is a key component of normal glomerular cell turnover.
- In immune complex nephritis, enhanced glomerular macrophage proliferation significantly amplifies their contribution to glomerular damage.
- Targeting macrophage proliferation may offer a therapeutic strategy for immune-mediated kidney diseases.