PT - JOURNAL ARTICLE AU - Kato, Mitsuo AU - Dang, Varun AU - Wang, Mei AU - Park, Jung Tak AU - Deshpande, Supriya AU - Kadam, Swati AU - Mardiros, Armen AU - Zhan, Yumei AU - Oettgen, Peter AU - Putta, Sumanth AU - Yuan, Hang AU - Lanting, Linda AU - Natarajan, Rama TI - TGF-β Induces Acetylation of Chromatin and of Ets-1 to Alleviate Repression of miR-192 in Diabetic Nephropathy AID - 10.1126/scisignal.2003389 DP - 2013 Jun 04 TA - Science Signaling PG - ra43--ra43 VI - 6 IP - 278 4099 - http://stke.sciencemag.org/content/6/278/ra43.short 4100 - http://stke.sciencemag.org/content/6/278/ra43.full SO - Sci. Signal.2013 Jun 04; 6 AB - MicroRNAs (miRNAs), such as miR-192, mediate the actions of transforming growth factor–β1 (TGF-β) related to the pathogenesis of diabetic kidney diseases. We found that the biphasic induction of miR-192 expression by TGF-β 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-β 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-β. 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.