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Title: Expression of transforming growth factor-beta1 and type IV collagen in the renal tubulointerstitium in experimental diabetes: effects of ACE inhibition.
Austin Authors: Gilbert, Richard E;Cox, Allison J;Wu, L L;Allen, Terri J;Hulthen, U L;Jerums, George ;Cooper, Mark E
Affiliation: Department of Medicine, University of Melbourne, Austin and Repatriation Medical Centre, Heidelberg, Victoria, Australia
Issue Date: 1-Mar-1998
Publication information: Diabetes; 47(3): 414-22
Abstract: Transforming growth factor-beta (TGF-beta) and the renin-angiotensin system (RAS) have both been implicated in the pathogenesis of glomerulosclerosis in diabetic kidney disease. However, tubulointerstitial pathology may also be an important determinant of progressive renal dysfunction in diabetic nephropathy. In the present study, we investigated tubulointerstitial injury, TGF-beta1 expression, and the effect of blocking the RAS by inhibition of ACE. We randomized 36 male SD rats to control and diabetic groups. Diabetes was induced in 24 rats by administration of streptozotocin; 12 diabetic rats were further randomized to receive the ACE inhibitor ramipril (3 mg/l drinking water). At 6 months, experimental diabetes was associated with tubulointerstitial damage, a 70% increase in expression of TGF-beta1 (P < 0.05 vs. control), and a 120% increase in alpha1 (IV) collagen gene expression (P < 0.01 vs. control). In situ hybridization demonstrated a diffuse increase in both TGF-beta1 and alpha1 (IV) collagen mRNA in renal tubules. In addition, intense expression of both transcripts was noted in regions of focal tubular dilatation. Administration of the ACE inhibitor ramipril prevented tubulointerstitial injury and the overexpression of TGF-beta1 and alpha1 (IV) collagen mRNA. Changes in gene expression were accompanied by parallel changes in immunostaining for TGF-beta1 and type IV collagen. The observed beneficial effects of ramipril on the tubulointerstitium in experimental diabetes suggest that this mechanism may contribute to the therapeutic effect of ACE inhibitors in diabetic nephropathy.
Gov't Doc #: 9519748
Journal: Diabetes
Type: Journal Article
Subjects: Angiotensin-Converting Enzyme Inhibitors.pharmacology.therapeutic use
Cohort Studies
Diabetes Mellitus, Experimental.complications
Diabetic Nephropathies.drug therapy.pathology
Gene Expression Regulation, Developmental.genetics
In Situ Hybridization
Kidney Tubules.chemistry.drug effects.pathology
RNA, Messenger.analysis.genetics
Ramipril.pharmacology.therapeutic use
Random Allocation
Rats, Sprague-Dawley
Renin-Angiotensin System.drug effects
Transforming Growth Factor beta.biosynthesis.genetics
Appears in Collections:Journal articles

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