Interleukin 1 protects rats against oxygen toxicity

Area of Science:

• Biomedical Science
• Pulmonary Medicine
• Toxicology

Background:

• Oxygen toxicity poses a significant risk in various clinical settings, necessitating protective strategies.
• The role of inflammatory mediators like interleukin 1 alpha (IL-1) in mitigating hyperoxic injury is not well understood.

Purpose of the Study:

• To investigate the protective effects of interleukin 1 alpha (IL-1) against acute oxygen (O2) toxicity in a rat model.
• To explore the association between IL-1 administration and pulmonary antioxidant enzyme activity under hyperoxic conditions.

Main Methods:

• Rats were administered varying doses of IL-1 via tracheal insufflation.
• Animals were subsequently exposed to 100% oxygen, and survival rates were monitored.
• Pulmonary injury and the activity of antioxidant enzymes, including Mn-superoxide dismutase (Mn-SOD), were assessed at different time points.

Main Results:

• IL-1 administration demonstrated a dose-dependent protection against O2 toxicity, significantly increasing survival rates compared to controls.
• IL-1 treatment attenuated severe pulmonary injury observed in control rats after O2 exposure.
• Protection correlated with a selective enhancement of pulmonary Mn-SOD activity, and increased activities of multiple antioxidant enzymes (Mn-SOD, Cu,Zn-SOD, catalase, glutathione peroxidase) were observed in surviving rats.

Conclusions:

• Interleukin 1 alpha (IL-1) confers significant protection against acute oxygen toxicity in rats.
• Enhanced pulmonary Mn-SOD activity may contribute to the acute protective effects of IL-1.
• Increased activities of multiple pulmonary antioxidant enzymes suggest a role for IL-1 in chronic adaptation to hyperoxic environments.