Gene Therapy Breakthrough in Chronic Obstructive Pulmonary Disease

Researchers at Sun Yat-sen University in China have made a groundbreaking discovery in the field of gene therapy, identifying a key mechanism driving chronic obstructive pulmonary disease (COPD) and potential therapeutic targets. The study focuses on the role of cigarette smoke (CS) in triggering ferroptosis, a form of cell death, in macrophages, which are immune cells that play a crucial role in COPD development. The research team, led by Zhimin Peng, conducted integrated transcriptomic and metabolomic analyses of CS-exposed macrophages and identified the activation of the ferroptosis pathway, accompanied by dysregulated glycerophospholipid metabolism.

Key Takeaways:

• The study reveals that cigarette smoke induces the production of phosphatidylcholine species, particularly 1,2-dilinoleoyl-sn-glycero-3-phosphocholine (DLPC), which exacerbates lipid peroxidation and triggers ferroptosis in macrophages.
• DLPC's regulatory axis is linked to the deubiquitinase ubiquitin-specific peptidase 7 (USP7), which normally stabilizes glutathione peroxidase 4 (GPX4), and its downregulation accelerates GPX4 ubiquitination and subsequent proteasomal degradation.
• The study shows that glycerol-3-phosphate acyltransferase 3 (GPAT3) is upregulated by CS, and its genetic ablation diminishes PUFA-PC (including DLPC) synthesis, attenuates lipid reactive oxygen species (ROS) accumulation, and inhibits ferroptosis in CS-stimulated macrophages.
• In vivo, adeno-associated virus-mediated GPAT3 knockdown in murine lung tissues mitigates ROS production, ferroptosis, and emphysema in an experimental emphysema murine model.
• Researchers identified DLPC and GPAT3 as potential therapeutic targets for COPD.

Statistics:

• 1,2-dilinoleoyl-sn-glycero-3-phosphocholine (DLPC) was found to be markedly elevated in CS-exposed macrophages, exacerbating lipid peroxidation and triggering ferroptosis.
• The study revealed that DLPC downregulated the deubiquitinase ubiquitin-specific peptidase 7 (USP7), which normally stabilizes glutathione peroxidase 4 (GPX4), leading to its ubiquitination and proteasomal degradation.
• The adeno-associated virus-mediated GPAT3 knockdown in murine lung tissues resulted in a significant reduction of ROS production, ferroptosis, and emphysema in an experimental emphysema murine model.

Sources:

• Cigarette smoke-induced glycerophospholipid DLPC promotes macrophage ferroptosis through the USP7/GPX4 regulatory axis in chronic obstructive pulmonary disease. Chemico-Biological Interactions, 2025;420:111697.
• Zhimin Peng, Dept. of Respiratory and Critical Medicine, Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong, 518000, People's Republic of China.
• Elsevier Ireland Ltd, Elsevier House, Brookvale Plaza, East Park Shannon, Co, Clare, 00000, Ireland.