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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2014 ; 289
(42
): 29001-13
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Transforming growth factor ?1 (TGF-?1) enhances expression of profibrotic genes
through a novel signaling cascade and microRNAs in renal mesangial cells
#MMPMID25204661
Castro NE
; Kato M
; Park JT
; Natarajan R
J Biol Chem
2014[Oct]; 289
(42
): 29001-13
PMID25204661
show ga
Increased expression of transforming growth factor-?1 (TGF-?1) in glomerular
mesangial cells (MC) augments extracellular matrix accumulation and hypertrophy
during the progression of diabetic nephropathy (DN), a debilitating renal
complication of diabetes. MicroRNAs (miRNAs) play key roles in the pathogenesis
of DN by modulating the actions of TGF-?1 to enhance the expression of
profibrotic genes like collagen. In this study, we found a significant decrease
in the expression of miR-130b in mouse MC treated with TGF-?1. In parallel, there
was a down-regulation in miR-130b host gene 2610318N02RIK (RIK), suggesting host
gene-dependent expression of this miRNA. TGF-? receptor 1 (TGF-?R1) was
identified as a target of miR-130b. Interestingly, the RIK promoter contains
three NF-Y binding sites and was regulated by NF-YC. Furthermore, NF-YC
expression was inhibited by TGF-?1, suggesting that a signaling cascade,
involving TGF-?1-induced decreases in NF-YC, RIK, and miR-130b, may up-regulate
TGF-?R1 to augment expression of TGF-?1 target fibrotic genes. miR-130b was
down-regulated, whereas TGF-?R1, as well as the profibrotic genes collagen type
IV ? 1 (Col4a1), Col12a1, CTGF, and PAI-1 were up-regulated not only in mouse MC
treated with TGF-?1 but also in the glomeruli of streptozotocin-injected diabetic
mice, supporting in vivo relevance. Together, these results demonstrate a novel
miRNA- and host gene-mediated amplifying cascade initiated by TGF-?1 that results
in the up-regulation of profibrotic factors, such as TGF-?R1 and collagens
associated with the progression of DN.