Irisin protects mitochondria function during pulmonary ischemia/reperfusion injury

Area of Science:

• Physiology
• Molecular Biology
• Cell Biology

Background:

• Remote ischemic preconditioning (RIPC) protects organs from ischemia/reperfusion (IR) injury.
• Endocrine mechanisms of RIPC-mediated organ protection are under investigation.
• Irisin, a myokine from fibronectin domain-containing 5 protein (FNDC5), is implicated in inter-organ communication.

Purpose of the Study:

• To investigate the role of irisin in RIPC-mediated lung protection.
• To elucidate the mechanism of irisin's protective effect on the lung during IR injury.

Main Methods:

• Analysis of irisin concentrations in human patients with neonatal respiratory distress syndrome.
• Induction of RIPC in mice and assessment of irisin levels in circulation and lung tissue.
• Investigation of irisin uptake and mitochondrial targeting in alveolar cells.
• Studies using UCP2-deficient mice and UCP2 inhibitors to evaluate irisin's protective mechanism.

Main Results:

• RIPC stimulates irisin release into circulation and its transfer to the lung.
• Irisin enters alveolar cells via endocytosis and targets mitochondria.
• Irisin interacts with mitochondrial uncoupling protein 2 (UCP2) to prevent oxidative stress and maintain mitochondrial function.
• Exogenous irisin administration protects the lung from IR injury, an effect dependent on UCP2.

Conclusions:

• Irisin is a key myokine mediating RIPC-induced lung protection.
• Irisin's protective effects are linked to its action on mitochondrial function via UCP2.
• Targeting irisin's mitochondrial activity presents a therapeutic strategy for pulmonary IR injury.