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Journal Article
Research Support, Non-U.S. Gov't
Augmenter of liver regeneration regulates autophagy in renal ischemia-reperfusion injury via the AMPK/mTOR pathway.
Autophagy may have protective effects in renal ischemia-reperfusion (I/R) injury, although the underlying mechanisms remain unclear. Augmenter of liver regeneration (ALR), a widely distributed multifunctional protein that is originally identified as a hepatic growth factor, may participate in the process of autophagy. To investigate the role of ALR in autophagy, ALR expression is knocked-down in human kidney 2 (HK-2) cells with short hairpin RNA lentivirals. Then, the level of autophagy is measured in the shRNA/ALR group and the shRNA/control group in an in vitro model of ischemia-reperfusion (I/R). The results indicate that the level of autophagy in two groups increase, accompanied by increased reactive oxygen species production, especially in the shRNA/ALR group. The AMPK/mTOR signaling pathway is hyperactive in the shRNA/ALR group. Inhibition of autophagy with the AMPK inhibitor compound C induce apoptosis, especially in the shRNA/ALR group. These findings collectively indicate that ALR negatively regulates the autophagy process through an association with the AMPK/mTOR signaling pathway. Autophagy inhibit apoptosis and play a protective role under conditions of oxidative stress.
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