[N-acetylcysteine decreases functional and structural, ARDS-typical lung changes in endotoxin-treated rats]

Area of Science:

• Pulmonary Medicine
• Toxicology
• Pharmacology

Background:

• Activated granulocytes release oxygen radicals, contributing to acute lung injury (ALI), including adult respiratory distress syndrome (ARDS).
• N-acetylcysteine (NAC) supports endogenous glutathione production, a key antioxidant found in lung tissue.

Purpose of the Study:

• To investigate the therapeutic effect of exogenous N-acetylcysteine (NAC) on endotoxin-induced ARDS-like lung injury in a rat model.
• To evaluate NAC's impact on survival, lung pathology, and physiological parameters in endotoxemic rats.

Main Methods:

• ARDS-like injury was induced in rats using intraperitoneal injection of Salmonella enteritidis endotoxin.
• Rats received N-acetylcysteine (NAC) or solvent intraperitoneally before, during, and after endotoxin administration.
• Evaluated outcomes included mortality, lung wet weight, histological lung damage, lung albumin leakage, and perfusate levels of thromboxane B2 and 6-keto-prostaglandin-F1 alpha.

Main Results:

• Endotoxin injection led to 80% mortality, increased lung wet weight, severe lung damage, blunted vasocontractility, and elevated albumin leakage.
• NAC treatment significantly improved survival rates in endotoxin-treated rats.
• NAC administration ameliorated lung structural damage, reduced lung wet weight and albumin leakage, and decreased inflammatory mediators.

Conclusions:

• N-acetylcysteine (NAC) significantly mitigates endotoxin-induced ARDS-like lung injury in rats.
• NAC demonstrates protective effects against oxidative stress and inflammation associated with ALI.
• The findings support the potential therapeutic role of NAC in managing ARDS.