The Journal of Experimental Medicine
VeriKine-HS Human IFN-Beta
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Journal of Experimental Medicine, Vol 149, 127-136, Copyright © 1979 by Rockefeller University Press

ARTICLES

Role of marrow-derived monocytes and mesangial cells in removal of immune complexes from renal glomeruli

GE Striker, M Mannik and MY Tung

Phagocytosis of intravenously administered immune complexes by cells in the mesangium was investigated. The model used was that of exchange marrow transplantation between Chediak-Higashi (CH) mice and syngeneic partners after X-irradiation. This model was chosen since marrow- derived macrophages could be differentiated from resident mesangial cells by the presence of the characteristic giant lysosomes in phagocytic cells of the CH mice. Injected immune complexes were cleared normally and localized in the glomerular mesangium in CH or C57BL/6J mice receiving either C57BL/6J or CH marrow. C57BL/6J mice with CH marrow injected with immune complexes prepared with reduced and alkylated antibodies accumulated many cells within the mesangium that contained both giant lysosomes and electron dense deposits. Deposits were not found in cells with subplasmalemmal microfilaments and perpheral dense bodies. Conversely, the cells in the mesangium of CH mice with C57BL/6J marrow that contained electron dense deposits were devoid of giant lysosomes. Based on these observations, we concluded that (a) marrow-derived monocytes contribute to mesangial hypercellularity after deposition of immune complexes and (b) phagocytosis of immune complexes localized in the glomerular mesangium was by marrow-derived monocytes rather than by mesangial cells.
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