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Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Nat+Commun 2014 ; 5 (ä): 5798 Nephropedia Template TP
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STAT3 restrains RANK- and TLR4-mediated signaling by suppressing expression of the E2 ubiquitin ligase Ubc13 #MMPMID25503582
Zhang H; Hu H; Greeley N; Jin J; Matthews AJ; Ohashi E; Caetano MS; Li HS; Wu X; Mandal PK; McMurray JS; Moghaddam SJ; Sun SC; Watowich SS
Nat Commun 2014[]; 5 (ä): 5798 PMID25503582show ga
The transcriptional regulator STAT3 curbs pro-inflammatory cytokine production mediated by NF-?B signaling in innate immune cells, yet the mechanism by which this occurs has been unclear. Here we identify STAT3 as a pivotal negative regulator of Ubc13, an E2 ubiquitin-conjugating enzyme that facilitates TRAF6 K63-linked ubiquitination and NF-?B activation. Ubc13 accumulates intracellularly in the absence of STAT3. Depletion of Ubc13 in Stat3-deficient macrophages subdues excessive RANKL- or LPS-dependent gene expression, indicating Ubc13 overexpression mediates enhanced transcriptional responses in the absence of STAT3. In RANKL-activated macrophages, STAT3 is stimulated by autocrine IL-6 and inhibits accrual of Ets-1, Set1 methyltransferase and trimethylation of histone H3 lysine 4 (H3K4me3) at the Ube2n (Ubc13) promoter. These results delineate a mechanism by which STAT3 operates as a transcriptional repressor on Ube2n, thus modulating NF-?B activity by regulation of Ubc13 abundance. Our data suggest this pathway plays important roles in bone homeostasis and restraint of inflammation.