Effect of alpha-phenyl-tert-butylnitrone on endotoxin toxemia in horses.

The study aims to investigate the use of a certain chemical compound, sulfonyl analog of the alpha-phenyl-N-tert-butyl-nitrone (PBN) spin-trap molecule, as a novel treatment for endotoxemia in horses. It found that in specific doses, this compound could enhance the survivability of mice challenged with a toxic bacteria component and reduce distress in horses exposed to a non-lethal dose of the same toxin.

Background

• Lipopolysaccharide (LPS), also known as endotoxin, is a component of the cell wall of gram-negative bacteria.
• This bacteria is naturally present in the gastrointestinal tract of horses, but, if the gut wall integrity is compromised, these toxins can lead to diseases.
• Existing treatments for endotoxemia – the high concentration of endotoxins in an animal’s bloodstream- are relatively limited.

Objective and Methodology

• The study’s purpose is to test the efficacy of a sulfonyl analog of the alpha-phenyl-N-tert-butyl-nitrone (PBN) spin-trap molecule in treating endotoxemia in horses.
• Researchers administered different dosages of PBN to mice and horses that were exposed to lethal and sublethal doses of LPS respectively, and observed the changes in survivability and physiological distress.

Findings

• The survivability of mice, challenged with a dosage of 55 mg/kg LPS, significantly increased after treatment with 100 and 175 mg/kg PBN.
• The survivability of mice treated with 175 mg/kg PBN was notably lower than those treated with 100 mg/kg PBN.
• Mice treated with 300 and 1000 mg/kg PBN survived for a significantly shorter period of time compared to the control group.
• Horses treated with a sublethal dose of endotoxin experienced 2 periods of distress at 1 and 6 hours after challenge. Disulfonyl-PBN greatly reduced the increase in heart and respiratory rates 6 hours post-challenge.

Conclusions

• The results suggest that analogs of PBN can be used to treat endotoxemia following a near-lethal challenge with LPS.
• The benefits are more apparent in life-threatening situations, suggesting that this could be a promising tool for critical care.