[PDCD4 knockdown ameliorates lipopolysaccharide-induced endothelial cell damage by improving mitochondrial dynamics]

Area of Science:

• Cell Biology
• Mitochondrial Dynamics
• Sepsis Pathophysiology

Context:

• Sepsis induces vascular endothelial damage through mitochondrial dysfunction.
• Programmed cell death factor 4 (PDCD4) plays a role in this process.
• Understanding PDCD4's role is crucial for developing therapeutic strategies.

Purpose:

• To investigate the role of PDCD4 in sepsis-related mitochondrial dysfunction in vascular endothelial cells.
• To determine how PDCD4 influences mitochondrial fission and fusion dynamics.
• To assess the therapeutic potential of modulating PDCD4 in sepsis.

Summary:

• Knockdown of PDCD4 in human umbilical vein endothelial cells (HUVECs) and mouse vascular endothelial cells (C166) was achieved using small interfering RNA.
• Lipopolysaccharide (LPS) treatment increased inflammatory markers, PDCD4 expression, and promoted mitochondrial fission (increased FIS1, DRP1; decreased OPA1), leading to oxidative stress and reduced mitochondrial membrane potential.
• PDCD4 knockdown protected cells by inhibiting LPS-induced inflammation and oxidative stress, restoring mitochondrial fission-fusion balance, and maintaining mitochondrial function. Carbonyl cyanide 3-chlorophenylhydrazone (FCCP) treatment attenuated these protective effects.

Impact:

• PDCD4 knockdown demonstrates a protective effect against sepsis-induced vascular endothelial damage.
• Modulating PDCD4 offers a potential therapeutic target for sepsis treatment.
• This study provides insights into the mechanisms of mitochondrial dysfunction in sepsis.