Anionic Sites in Glomerular Basement Membrane of Rats with Serum Sickness Nephritis: Quick-freezing and Deep-etching Study

Overview

Journal Histochem J

Specialty Biochemistry

Date 1993 May 1

PMID 8320129

Authors

H J Duan

S Ohno

H Shigematsu

Affiliations

Soon will be listed here.

Abstract

Serum sickness nephritis was induced in male Fisher 344/JCL rats by injecting egg albumin into the foot pads and peritoneal cavity. The alteration of anionic sites in the glomerular basement membrane (GBM) of the rats with significant proteinuria was studied with a quick-freezing and deep-etching method using polyethyleneimine as a cationic probe. In control rats, anionic sites were located around the fibrils of the lamina rara externa, which radiated perpendicularly from the lamina densa to podocyte cell membranes. In the glomeruli of proteinuric rats, many electron-dense deposits were observed in the subepithelial side of the GBM, where the fibrils of the lamina rara externa were usually obscured and anionic sites around them could not be recognized. However, in some areas, a clear boundary could be observed between deposits and the lamina densa. Electron micrographs of freeze-fractured deposits showed that the fibrils radiated perpendicularly from the lamina densa and that anionic sites around them had been preserved. These results suggest that some of the deposits simply passed through the GBM and masked transiently the fibril structures of the GBM, but others probably destroyed these fibril structures, including anionic sites.

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