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Journal of the American Society of Nephrology, Vol 5, 2087-2090, Copyright © 1995 by American Society of Nephrology

REGULAR ARTICLES

Fibronectin mRNA in the developing glomerular crescent in rabbit antiglomerular basement membrane disease

SP Sady, M Goyal, PE Thomas, BL Wharram and RC Wiggins
Nephrology Division, University of Michigan, Ann Arbor 48109, USA.

Fibronectin is a multifunctional matrix protein important in wound healing that is markedly increased in glomerular crescents. A previous report established two phases of fibronectin metabolism in crescent formation in an anti-glomerular basement membrane model of crescentic nephritis in the rabbit. Phase I was associated with increased glomerular fibronectin content from plasma. Phase II was associated with increased fibronectin mRNA in glomeruli. To examine the hypothesis that fibronectin is synthesized in the developing crescent, rabbit fibronectin cDNA was cloned, sense and antisense riboprobes were prepared and their specificity under the conditions to be used was validated and in situ hybridization studies were performed in the model. The results showed that the cells in the developing glomerular crescent express an intense fibronectin mRNA signal at Day 7 and that this signal persisted in cells of the crescent at Day 14. This result shows that fibronectin synthesis does indeed take place in cells of the developing crescent in this model and supports the hypothesis that fibronectin may be an important agent regulating crescent formation and fibrosis.




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Copyright © 2008 by the American Society of Nephrology. Online ISSN: 1533-3450 Print ISSN: 1046-6673