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Deprecated: Implicit conversion from float 269.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Hepatol 2015 ; 63 (5): 1147-55 Nephropedia Template TP
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Inhibition of sterile danger signals, uric acid and ATP, prevents inflammasome activation and protects from alcoholic steatohepatitis in mice #MMPMID26100496
Iracheta-Vellve A; Petrasek J; Satishchandran A; Gyongyosi B; Saha B; Kodys K; Fitzgerald KA; Kurt-Jones EA; Szabo G
J Hepatol 2015[Nov]; 63 (5): 1147-55 PMID26100496show ga
Background & Aims: The inflammasome is a well-characterized inducer of inflammation in ASH. Inflammasome activation requires two signals for mature interleukin (IL)-1? production. Here we asked whether metabolic danger signals trigger inflammasome activation in ASH. Methods: Wild-type mice, ATP receptor 2×7 (P2rx7)-KO mice, or mice overexpressing uricase were fed Lieber-DeCarli ethanol or control diet. We also implemented a pharmacological approach in which mice were treated with probenecid or allopurinol. Results: The sterile danger signals, ATP and uric acid, were increased in the serum and liver of alcohol-fed mice. Depletion of uric acid or ATP, or lack of ATP signaling attenuated ASH and prevented inflammasome activation and its major downstream cytokine, IL-1?. Pharmacological depletion of uric acid with allopurinol provided significant protection from alcohol-induced inflammatory response, steatosis and liver damage, and additional protection was achieved in mice treated with probenecid, which depletes uric acid and blocks ATP-induced P2rx7 signaling. We found that alcohol-damaged hepatocytes released uric acid and ATP in vivo and in vitro and that these sterile danger signals activated the inflammasome in LPS-exposed liver mononuclear cells. Conclusions: Our data indicate that the second signal in inflammasome activation and IL-1? production in ASH results from the endogenous danger signals, uric acid and ATP. Inhibition of signaling triggered by uric acid and ATP may have therapeutic implications in ASH.