We will also offer a model of predominantly tubulointerstitial injury-unilateral ureteral obstruction in the fibrosis prone 129/sv strain. Ureteral obstruction will be achieved by ligating the left ureter with 3-0 silk through a left lateral incision (9). Significant tubulointerstitial matrix accumulation is seen within 5-7 days, and there is progressive destruction of tubular architecture.
UUO > Literature Section
Publications for UUO (1)
Ma LJ, Yang H, Gaspert A, Carlesso G, Barty MM, Davidson JM, Sheppard D, Fogo AB. Transforming growth factor-beta-dependent and -independent pathways of induction
of tubulointerstitial fibrosis in beta6(-/-) mice. Am J Pathol (2003) 163:1261-73
View abstract View in PubMed
Transforming growth factor-beta1 (TGF-beta1) and the renin-angiotensin-aldosterone system are key mediators in kidney fibrosis. Integrin alphavbeta6, a heterodimeric matrix receptor expressed in epithelia, binds and activates latent TGF-beta1. We used beta6 integrin-null mice (beta6(-/-)) to determine the role of local TGF-beta1 activation in renal fibrosis in the unilateral ureteral obstruction (UUO) model. Obstructed kidneys from beta6(-/-) mice showed less injury than obstructed kidneys from wild-type (WT) mice, associated with lower collagen I, collagen III, plasminogen activator inhibitor (PAI-1), and TGF-beta1 mRNA levels and lower collagen content. Infusion with either angiotensin II (Ang II) or aldosterone (Aldo) or combination in beta6(-/-) UUO mice significantly increased collagen contents to levels comparable to those in identically treated WT. Active TGF-beta protein expression in beta6(-/-) mice was less in UUO kidneys with or without Ang II infusion compared to matched WT mice. Activated Smad 2 levels in beta6(-/-) obstructed kidneys were lower than in WT UUO mice, and did not increase when fibrosis was induced in beta6(-/-) UUO mice by Ang II infusion. Anti-TGF-beta antibody only partially decreased this Ang II-stimulated fibrosis in beta6(-/-) UUO kidneys. In situ hybridization and immunostaining showed low expression of PAI-1 mRNA and protein in tubular epithelium in beta6(-/-) UUO kidneys, with increased PAI-1 expression in response to Ang II, Aldo, or both. Our results indicate that interruption of alphavbeta6-mediated activation of TGF-beta1 can protect against tubulointerstitial fibrosis. Further, the robust induction of tubulointerstitial fibrosis without increase in activated Smad 2 levels in obstructed beta6(-/-) mice by Ang II suggests the existence of a TGF-beta1-independent pathway of induction of fibrosis through angiotensin.
|Service||Cost (Vanderbilt)||Cost (non-Vanderbilt)|
Click on the service name to request the service.
Additional content related to UUO
Last updated on 2013-11-06 Moderated by Raymond Harris