Propofol Inhibits Neutrophil Extracellular Traps Formation and Alleviates Sepsis-Induced Acute Lung Injury

Area of Science:

• Immunology
• Pharmacology
• Critical Care Medicine

Background:

• Sepsis-associated acute lung injury (ALI) involves excessive neutrophil extracellular traps (NETs) formation, leading to lung damage.
• Propofol, a sedative, possesses anti-inflammatory and antioxidant properties, but its impact on NETs in ALI is unclear.

Purpose of the Study:

• To investigate propofol's effects on NET formation in sepsis-induced ALI.
• To elucidate the potential mechanisms, including the Akt/mTOR signaling pathway, underlying propofol's action.

Main Methods:

• In vitro studies using lipopolysaccharide (LPS)-stimulated human neutrophils to assess propofol's impact on NET release.
• In vivo studies using an LPS-induced sepsis mouse model, evaluating lung injury and NET formation after propofol administration.

Main Results:

• Propofol suppressed lipopolysaccharide (LPS)-induced NET formation in vitro, potentially via modulating Akt/mTOR signaling and reducing neutrophil autophagy.
• In vivo, propofol treatment attenuated sepsis-induced lung injury and reduced NET formation in mice.
• Propofol administration increased Akt/mTOR pathway activity in lung tissue, though direct functional validation in vivo was not performed.

Conclusions:

• Propofol demonstrates protective effects against sepsis-induced lung injury by suppressing NET formation.
• The Akt/mTOR pathway is implicated as a potential mechanism for propofol's anti-NET effects.
• Further in vivo studies are needed to confirm the role of the Akt/mTOR pathway; propofol shows promise as an adjunctive sepsis therapy.