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Acute kidney injury (AKI) is associate with high mortality. Despite evidence of AKI-induced distant organ injury, a relationship between AKI and liver injury has not been clearly established. The goal of this study is to investigate whether renal ischemia-reperfusion (IR) can affect liver pathophysiology. We showed that renal IR in mice induced fatty liver and compromised liver function through the downregulation of constitutive androstane receptor (CAR; -90.4%) and inhibition of hepatic very-low-density lipoprotein triglyceride (VLDL-TG) secretion (-28.4%). Treatment of mice with the CAR agonist 1,4-bis[2-(3,5 dichloropyridyloxy)] benzene (TCPOBOP) prevented the development of AKI-induced fatty liver and liver injury, which was associated with the attenuation of AKI-induced inhibition of VLDL-TG secretion. The hepatoprotective effect of TCPOBOP was abolished in CAR -/- mice. Interestingly, alleviation of fatty liver by TCPOBOP also improved the kidney function, whereas CAR ablation sensitized mice to AKI-induced kidney injury and lethality. The serum concentrations of interleukin-6 (IL-6) were elevated by 27-fold after renal IR, but were normalized in TCPOBOP-treated AKI mice, suggesting that the increased release of IL-6 from the kidney may have mediated the AKI responsive liver injury. Taken together, our results revealed an interesting kidney-liver organ cross-talk in response to AKI. Given the importance of CAR in the pathogenesis of renal IR-induced fatty liver and impaired kidney function, fatty liver can be considered as an important risk factor for kidney injury, and a timely management of hepatic steatosis by CAR activation may help to restore kidney function in patients with AKI or kidney transplant.

Activation of Constitutive Androstane Receptor Ameliorates Renal Ischemia-Reperfusion–Induced Kidney and Liver Injury