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American Journal of Pathology, Vol 133, 557-563, Copyright © 1988 by American Society for Investigative Pathology

REGULAR ARTICLES

Interferon-induced glomerular basement membrane and endothelial cell lesions in mice. An immunogold ultrastructural study of basement membrane components

J Moss, I Shore, D Woodrow and I Gresser
Department of Histopathology, Charing Cross and Westminster Medical School, London, England.

Newborn Swiss mice were injected daily for the first week of life with mouse interferon alpha/beta. This treatment resulted in a delay in the maturation of the kidney and the development of glomerular abnormalities. The width of the glomerular basement membrane (GBM) was increased up to tenfold and was characterized by a marked thickening of the endothelial aspect of the GBM. The endothelial cells lining the capillary loops were also abnormal with many dilated regions of the rough endoplasmic reticulum that contained amorphous electron-opaque material. Immunogold studies showed that type IV collagen and laminin/entactin were distributed throughout the thickened GBM, and also within the dilated rough endoplasmic reticulum of the endothelial cells. These results show that the interferon-induced lesion within the glomerulus is associated with an accumulation of normal GBM components and that endothelial cells are involved in this pathologic process.

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