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Am J Physiol Cell Physiol 253: C535-C540, 1987;
0363-6143/87 $5.00
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AJP - Cell Physiology, Vol 253, Issue 4 C535-C540, Copyright © 1987 by American Physiological Society

ARTICLES

Distribution of meprin in kidneys from mice with high- and low-meprin activity

S. S. Craig, J. F. Reckelhoff and J. S. Bond
Department of Anatomy, Virginia Commonwealth University, Richmond 23298-0001.

An inherited deficiency of a metalloendopeptidase (meprin) activity occurs in kidneys of many inbred mouse strains. To clarify whether meprin protein is present in low-activity strains and determine the distribution of meprin in kidneys of mice with high- and low-meprin activities, kidney slices were stained through the use of the indirect immunoperoxidase technique and examined by light and electron microscopy. Light microscopy at high dilutions of anti-meprin IgG confirmed the brush border localization of meprin in high-meprin activity strains and revealed no detectable cross-reactive material in low-meprin activity strains. However, light and electron microscopy studies that use lower dilutions of anti-meprin immunoglobulin G (IgG) revealed cross-reactivity in low-activity strains, also at the luminal surface of the proximal tubules. Studies at lower magnifications indicated that meprin is primarily associated with the juxtamedullary region of the kidney in both high- and low-activity strains. Western blots of urinary proteins showed significant amounts of meprin-like proteins, but only in the urine of mice with high-meprin activity. The low activity of meprin in some inbred mouse strains is not associated with the presence of the protein in compartments of kidney cells other than the brush border or with secretion of the protein into the urine.


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