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- W2145217096 abstract "Lipoxins, which are endogenously produced lipid mediators, promote the resolution of inflammation, and may inhibit fibrosis, suggesting a possible role in modulating renal disease. Here, lipoxin A4 (LXA4) attenuated TGF-β1–induced expression of fibronectin, N-cadherin, thrombospondin, and the notch ligand jagged-1 in cultured human proximal tubular epithelial (HK-2) cells through a mechanism involving upregulation of the microRNA let-7c. Conversely, TGF-β1 suppressed expression of let-7c. In cells pretreated with LXA4, upregulation of let-7c persisted despite subsequent stimulation with TGF-β1. In the unilateral ureteral obstruction model of renal fibrosis, let-7c upregulation was induced by administering an LXA4 analog. Bioinformatic analysis suggested that targets of let-7c include several members of the TGF-β1 signaling pathway, including the TGF-β receptor type 1. Consistent with this, LXA4-induced upregulation of let-7c inhibited both the expression of TGF-β receptor type 1 and the response to TGF-β1. Overexpression of let-7c mimicked the antifibrotic effects of LXA4 in renal epithelia; conversely, anti-miR directed against let-7c attenuated the effects of LXA4. Finally, we observed that several let-7c target genes were upregulated in fibrotic human renal biopsies compared with controls. In conclusion, these results suggest that LXA4-mediated upregulation of let-7c suppresses TGF-β1–induced fibrosis and that expression of let-7c targets is dysregulated in human renal fibrosis." @default.
- W2145217096 created "2016-06-24" @default.
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- W2145217096 date "2013-04-01" @default.
- W2145217096 modified "2023-10-17" @default.
- W2145217096 title "Lipoxins Attenuate Renal Fibrosis by Inducing let-7c and Suppressing TGFβR1" @default.
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- W2145217096 doi "https://doi.org/10.1681/asn.2012060550" @default.
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