TGF-ß induces acetylation of chromatin and of Ets-1 to alleviate repression of miR-192 in diabetic nephropathy.
Sci Signal
; 6(278): ra43, 2013 Jun 04.
Article
em En
| MEDLINE
| ID: mdl-23737551
ABSTRACT
MicroRNAs (miRNAs), such as miR-192, mediate the actions of transforming growth factor-ß1 (TGF-ß) related to the pathogenesis of diabetic kidney diseases. We found that the biphasic induction of miR-192 expression by TGF-ß in mouse renal glomerular mesangial cells initially involved the Smad transcription factors, followed by sustained expression that was promoted by acetylation of the transcription factor Ets-1 and of histone H3 by the acetyltransferase p300, which was activated by the serine and threonine kinase Akt. In mesangial cells from Ets-1-deficient mice or in cells in which Ets-1 was knocked down, basal amounts of miR-192 were higher than those in control cells, but sustained induction of miR-192 by TGF-ß was attenuated. Furthermore, inhibition of Akt or ectopic expression of dominant-negative histone acetyltransferases decreased p300-mediated acetylation and Ets-1 dissociation from the miR-192 promoter and prevented miR-192 expression in response to TGF-ß. Activation of Akt and p300 and acetylation of Ets-1 and histone H3 were increased in glomeruli from diabetic db/db mice compared to nondiabetic db/+ mice, suggesting that this pathway may contribute to diabetic nephropathy. These findings provide insight into the regulation of miRNAs through signaling-mediated changes in transcription factor activity and in epigenetic histone acetylation under normal and disease states.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Cromatina
/
Fator de Crescimento Transformador beta
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MicroRNAs
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Nefropatias Diabéticas
Limite:
Humans
Idioma:
En
Revista:
Sci Signal
Assunto da revista:
CIENCIA
/
FISIOLOGIA
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Estados Unidos