The role of GPD2 on ferroptosis in sepsis-induced acute lung injury

Area of Science:

• Mitochondrial biology
• Cellular stress responses
• Sepsis research

Background:

• Sepsis-induced acute lung injury (ALI) significantly increases mortality.
• Glycerol-3-phosphate dehydrogenase 2 (GPD2), a mitochondrial enzyme, is implicated in oxidative stress, inflammation, and ferroptosis.
• The precise role of GPD2 in sepsis-induced ALI is not well understood.

Purpose of the Study:

• To investigate the role of Glycerol-3-phosphate dehydrogenase 2 (GPD2) in the pathogenesis of sepsis-induced acute lung injury (ALI).

Main Methods:

• A cecal ligation and puncture (CLP) mouse model was used to induce sepsis.
• Glycerol-3-phosphate dehydrogenase 2 (GPD2) expression was reduced using adeno-associated virus vectors.
• Selenomethionine (SeMet), a GPX4 activator, was administered to assess its effects on ferroptosis and lung injury.

Main Results:

• Glycerol-3-phosphate dehydrogenase 2 (GPD2) expression was elevated in the lungs of septic mice.
• Knockdown of GPD2 in septic mice led to decreased survival, increased lung injury (vascular permeability, neutrophil infiltration, inflammation, oxidative stress), and enhanced ferroptosis.
• Selenomethionine (SeMet) treatment inhibited ferroptosis and partially ameliorated the lung injury caused by GPD2 knockdown.

Conclusions:

• Glycerol-3-phosphate dehydrogenase 2 (GPD2) appears to protect against sepsis-induced lung injury by suppressing ferroptosis via the GPX4 pathway.
• GPD2 may mitigate pulmonary vascular permeability, neutrophil infiltration, oxidative stress, and inflammation in sepsis.
• GPD2 represents a potential therapeutic target for managing sepsis-induced acute lung injury.