Minto AW, Wilson HM, Rees AJ, Quigg RJ, Brown PAJ. Selective Expression of TGF-β2 and TGF-β3 Isoforms in Early Mesangioproliferative Glomerulonephritis.
ACTA ACUST UNITED AC 2004;
96:e111-8. [PMID:
15122060 DOI:
10.1159/000077377]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2003] [Accepted: 11/24/2003] [Indexed: 11/19/2022]
Abstract
BACKGROUND/AIM
Evidence from ex vivo glomerular analysis has implicated overexpression of transforming growth factor (TGF) beta 1 in progressive renal disease. The roles of TGF-beta2 and TGF-beta3 are less clear. The purpose of this study was to define the temporal expression and abundance of TGF-beta isoforms in both acute and progressive Thy-1 glomerulonephritis during the crucial initiation phase of these models.
METHODS
Acute Thy-1 glomerulonephritis was induced by a single injection of OX7, while the progressive model was induced by two injections, 7 days apart.
RESULTS
Cellular infiltration of glomeruli consisted of transient increases of neutrophils and ED1+ macrophages. The distribution of TGF-beta1, TGF-beta2, and TGF-beta3 revealed distinct differences in normal and nephritic rats. No changes in TGF-beta1 staining were observed within glomeruli of either model. In marked contrast, in the one-shot model, TGF-beta2 and TGF-beta3 stainings increased rapidly, yet transiently, throughout affected glomeruli, followed by more sustained staining in glomerular epithelial cells. Diffuse, transient staining was absent in two-shot glomerulonephritis, but an increase in epithelial cell staining mirrored that seen in the one-shot model.
CONCLUSION
Based on these results, we propose that the effects, formerly thought of as solely due to a single entity, TGF-beta1, may be the result of an interplay between individual TGF-beta isoforms.
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