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AJP - Renal Physiology, Vol 270, Issue 3 500-F509, Copyright © 1996 by American Physiological Society
ARTICLES |
D. P. Basile, J. M. Rovak, D. R. Martin and M. R. Hammerman
George M. O'Brien Kidney and Urological Disease Center, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
To gain insight into the role that transforming growth factor-beta 1 (TGF-beta 1) plays in the regeneration of kidneys following acute renal failure, we characterized the expression of TGF-beta 1 mRNA and the expression of active and latent TGF-beta peptide at various times during recovery from acute ischemic injury in rat. Levels of whole kidney TGF-beta 1 mRNA were elevated significantly at 12 h postinjury (1.5-fold vs. sham-operated controls), and by 24 h postinjury were elevated by 3.6-fold. Levels remained elevated for 14 days following ischemia, but were no longer elevated at 28 days postinjury. In situ hybridization demonstrated that the elevated expression of TGF-beta 1 was localized predominantly to cells in the regenerating tubules in the outer medulla. When examined at 14 days postischemia, levels of TGF-beta 1 mRNA were elevated in the outer medulla only in tubules that appeared incompletely regenerated. Immunohistochemical staining localized active TGF-beta to the lumen of proximal tubules in control animals and in desquamated and regenerating tubular epithelial cells following ischemia. TGF-beta 1 latency-associated peptide was present intracellularly in proximal tubules of sham-operated rats and reduced following ischemia. We hypothesize that endogenous renal TGF-beta serves to promote tissue regeneration following acute injury via an autocrine or paracrine mechanism.
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