TY - JOUR
T1 - TGF-beta1 induces aberrant laminin chain and collagen type IV isotype expression in the glomerular basement membrane.
AU - Chai, Qing
AU - Krag, Søren
AU - Miner, Jeffrey H.
AU - Nyengaard, Jens Randel
AU - Chai, Song
AU - Wogensen, Lise
PY - 2003
Y1 - 2003
N2 - Transforming growth factor-beta1 (TGF-beta1) contributes to the thickening of the glomerular basement membrane (GBM), abnormal deposition of extracellular matrix (ECM) therein and expansion of the mesangial matrix (MM) in several glomerular kidney diseases. However, the influence of TGF-beta1 on the expression of collagen IV isotypes and laminin chains in the GBM and the MM in vivo is not known in detail. By using transgenic mice with TGF-beta1 expression targeted to the juxtaglomerular apparatus and a combination of immunohistochemistry, Western blotting, immunoelectron microscopy and in situ hybridization, we investigated the contribution of different laminin chains and collagen type IV isotypes to the basement membrane thickening and mesangial expansion. We report that exposure of the glomerulus to TGF-beta1 in vivo induces aberrant deposition of fetal laminin alpha1, alpha2 and beta1 chains and collagen type IValpha1/alpha2 in the GBM. On the other hand, the TGF-beta1-mediated expansion of the mesangial ECM is dominated by the normal components. We found that the cellular origin of at least laminin alpha1 and alpha2 chains may be the glomerular endothelial cells. We speculate that the endothelial cells could contribute to TGF-beta1-induced glomerulopathy and should be considered as target cells for early intervention in glomerular diseases associated with TGF-beta1 in man.
AB - Transforming growth factor-beta1 (TGF-beta1) contributes to the thickening of the glomerular basement membrane (GBM), abnormal deposition of extracellular matrix (ECM) therein and expansion of the mesangial matrix (MM) in several glomerular kidney diseases. However, the influence of TGF-beta1 on the expression of collagen IV isotypes and laminin chains in the GBM and the MM in vivo is not known in detail. By using transgenic mice with TGF-beta1 expression targeted to the juxtaglomerular apparatus and a combination of immunohistochemistry, Western blotting, immunoelectron microscopy and in situ hybridization, we investigated the contribution of different laminin chains and collagen type IV isotypes to the basement membrane thickening and mesangial expansion. We report that exposure of the glomerulus to TGF-beta1 in vivo induces aberrant deposition of fetal laminin alpha1, alpha2 and beta1 chains and collagen type IValpha1/alpha2 in the GBM. On the other hand, the TGF-beta1-mediated expansion of the mesangial ECM is dominated by the normal components. We found that the cellular origin of at least laminin alpha1 and alpha2 chains may be the glomerular endothelial cells. We speculate that the endothelial cells could contribute to TGF-beta1-induced glomerulopathy and should be considered as target cells for early intervention in glomerular diseases associated with TGF-beta1 in man.
UR - http://www.scopus.com/inward/record.url?scp=1942470386&partnerID=8YFLogxK
U2 - 10.1159/000072496
DO - 10.1159/000072496
M3 - Article
C2 - 12972711
AN - SCOPUS:1942470386
SN - 1660-2129
VL - 94
SP - e123-136
JO - Nephron. Experimental nephrology
JF - Nephron. Experimental nephrology
IS - 4
ER -