Polyol Pathway Exacerbated IschemiaReperfusion-Induced Injury in Steatotic Liver

Abstract EN

Background.

The polyol pathway, a bypass pathway of glucose metabolism initiated by aldose reductase (AR), has been shown to play an important role in mediating tissue ischemia/reperfusion (I/R) impairment recently.

Here, we investigated how and why this pathway might affect the fatty liver following I/R.

Methods.

Two opposite models were created: mice with high-fat-diet-induced liver steatosis were treated with aldose reductase inhibition (ARI) and subsequent I/R; and AR-overexpressing L02 hepatocytes were sequentially subjected to steatosis and hypoxia/reoxygenation.

We next investigated (a) the hepatic injuries, including liver function, histology, and hepatocytes apoptosis/necrosis; (b) the NAD(P)(H) contents, redox status, and mitochondrial function; and (c) the flux through the caspase-dependent apoptosis pathway.

Results.

AR-inhibition in vivo markedly attenuated the I/R-induced liver injuries, maintained the homeostasis of NAD(P)(H) contents and redox status, and suppressed the caspase-dependent apoptosis pathway.

Correspondingly, AR overexpression in vitro presented the opposite effects.

Conclusion.

The flux through the polyol pathway may render steatotic liver greater vulnerability to I/R.

Interventions targeting this pathway might provide a novel adjunctive approach to protect fatty liver from ischemia.