Salinomycin ameliorates oxidative hepatic damage through AMP-activated protein kinase, facilitating autophagy

Area of Science:

• Biochemistry
• Pharmacology
• Hepatology

Background:

• Salinomycin, an ionophore from Streptomyces albus, is known for anti-cancer properties.
• Investigating potential antioxidant and hepatic protective effects of salinomycin is crucial due to drug-related toxicities.
• Understanding salinomycin's cellular mechanisms against oxidative stress is essential.

Purpose of the Study:

• To investigate the antioxidant and hepatic protective effects of salinomycin.
• To elucidate the cellular mechanisms underlying salinomycin's protective actions against oxidative stress and mitochondrial impairment.
• To evaluate salinomycin's efficacy in vivo and in vitro models of liver injury.

Main Methods:

• In vitro studies using hepatocytes to assess inhibition of arachidonic acid (AA) + iron-induced apoptosis, mitochondrial dysfunction, and ROS production.
• Molecular mechanism analysis involving assessment of autophagy markers (acidic vesicle organelles, p62, LC3-II) and AMP-activated protein kinase (AMPK) activation.
• In vivo studies involving oral administration of salinomycin in mice to evaluate protection against carbon tetrachloride (CCl4)-induced liver injury and oxidative stress.

Main Results:

• Salinomycin inhibited AA + iron-induced apoptosis, mitochondrial dysfunction, and reactive oxygen species (ROS) production in hepatocytes.
• Salinomycin induced autophagy via AMPK activation, a process critical for its protective effects, as demonstrated by blocking effects upon AMPK inhibition.
• Oral salinomycin administration in mice protected against CCl4-induced oxidative stress and liver injury, activating hepatic AMPK and autophagy pathways.

Conclusions:

• Salinomycin effectively protects hepatocytes against oxidative stress and mitochondrial dysfunction induced by AA + iron.
• Salinomycin demonstrates significant hepatoprotective effects against CCl4-induced liver injury in vivo.
• The protective mechanisms involve the activation of AMPK and autophagy, suggesting salinomycin's potential therapeutic applications for a wide range of diseases.